{"id":31596,"date":"2025-04-16T10:47:07","date_gmt":"2025-04-16T08:47:07","guid":{"rendered":"https:\/\/www.websupport.sk\/podpora\/?post_type=ht_kb&#038;p=31596"},"modified":"2025-05-21T11:47:50","modified_gmt":"2025-05-21T09:47:50","slug":"ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.sk\/podpora\/kb\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\/","title":{"rendered":"Ubuntu Server &#8211; kompletn\u00fd preh\u013ead inform\u00e1ci\u00ed o syst\u00e9me pre administr\u00e1tora po prvom prihl\u00e1sen\u00ed"},"content":{"rendered":"\n<p>Ak ste sa pr\u00e1ve prihl\u00e1sili do nov\u00e9ho Linuxov\u00e9ho syst\u00e9mu (napr\u00edklad Ubuntu servera, ako je to v na\u0161om pr\u00edpade), prv\u00fdm krokom by malo by\u0165 d\u00f4kladn\u00e9 zozn\u00e1menie sa s realitou, v ktorej sa syst\u00e9m nach\u00e1dza. Ako administr\u00e1tor potrebujete r\u00fdchlo zisti\u0165, ak\u00e9 m\u00e1te opr\u00e1vnenia, kto \u010fal\u0161\u00ed k nemu pristupuje a ak\u00e9 slu\u017eby alebo aplik\u00e1cie s\u00fa na \u0148om spusten\u00e9.<\/p>\n\n\n\n<p>Tento n\u00e1vod v\u00e1m pom\u00f4\u017ee krok za krokom overi\u0165 v\u0161etky z\u00e1kladn\u00e9, ale aj pokro\u010dil\u00e9 inform\u00e1cie o syst\u00e9me. Od jednoduch\u00e9ho zis\u0165ovania, kto ste a ak\u00e9 m\u00e1te pr\u00e1va, a\u017e po hlb\u0161iu anal\u00fdzu v\u00fdkonnosti, bezpe\u010dnosti a sie\u0165ovej prev\u00e1dzky servera. Ka\u017ed\u00fd krok je doplnen\u00fd vysvetlen\u00edm, \u010do jednotliv\u00fd v\u00fdstup znamen\u00e1 a pre\u010do je pre V\u00e1s ako spr\u00e1vcu d\u00f4le\u017eit\u00fd.<\/p>\n\n\n\n<p>Cie\u013eom nie je len nazbiera\u0165 fakty, ale porozumie\u0165 s\u00favislostiam. Napr\u00edklad: ak zist\u00edte, \u017ee niektor\u00fd port je otvoren\u00fd, neostanete len pri tejto inform\u00e1cii, ale pozriete sa aj na to, ktor\u00e1 slu\u017eba ho vyu\u017e\u00edva, \u010di je chr\u00e1nen\u00e1 firewallom a kto sa k nej prip\u00e1ja. Tento typ inform\u00e1ci\u00ed je k\u013e\u00fa\u010dov\u00fd pri prevencii bezpe\u010dnostn\u00fdch incidentov a pri pl\u00e1novan\u00ed \u010fal\u0161\u00edch krokov v spr\u00e1ve syst\u00e9mu.<\/p>\n\n\n\n<p>Na konci tohto n\u00e1vodu by ste mali ma\u0165 v ruk\u00e1ch kompletn\u00fd preh\u013ead o serveri, ktor\u00fd V\u00e1m umo\u017en\u00ed robi\u0165 informovan\u00e9 rozhodnutia \u2013 \u010di u\u017e ide o ladenie v\u00fdkonu, nastavenie opr\u00e1vnen\u00ed, alebo bezpe\u010dnostn\u00fd audit. Tento z\u00e1kladn\u00fd audit odpor\u00fa\u010dame vykon\u00e1va\u0165 nielen pri prvom prihl\u00e1sen\u00ed, ale aj pravidelne, ako s\u00fa\u010das\u0165 be\u017enej \u00fadr\u017eby.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Identita a pr\u00edstupov\u00e9 pr\u00e1va<\/h2>\n\n\n\n<p><strong>Pre\u010do za\u010da\u0165 pr\u00e1ve tu?&nbsp;<\/strong><\/p>\n\n\n\n<p>Pri prvom prihl\u00e1sen\u00ed do syst\u00e9mu je nevyhnutn\u00e9 vedie\u0165, kto z jeho poh\u013eadu ste. In\u00fdmi slovami \u2013 pod ak\u00fdm pou\u017e\u00edvate\u013esk\u00fdm \u00fa\u010dtom ste prihl\u00e1sen\u00fd, ak\u00e9 m\u00e1te opr\u00e1vnenia a ak\u00e9 skupiny ovplyv\u0148uj\u00fa va\u0161e mo\u017enosti spr\u00e1vy syst\u00e9mu. T\u00e1to inform\u00e1cia je z\u00e1kladom pre \u010fal\u0161ie rozhodovanie \u2013 napr\u00edklad, \u010di m\u00f4\u017eete in\u0161talova\u0165 bal\u00ed\u010dky, re\u0161tartova\u0165 slu\u017eby alebo meni\u0165 syst\u00e9mov\u00e9 nastavenia.<\/p>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">whoami<br>id<br>groups<\/pre>\n\n\n\n<p><strong>\u010co v\u00e1m tieto pr\u00edkazy povedia:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>whoami <\/code>\u2013 vr\u00e1ti aktu\u00e1lne pou\u017e\u00edvate\u013esk\u00e9 meno. Je to najjednoduch\u0161\u00ed sp\u00f4sob, ako si overi\u0165, pod ak\u00fdm kontom ste prihl\u00e1sen\u00fd.<\/li>\n\n\n\n<li><code>id <\/code>\u2013 zobraz\u00ed viac detailov: numerick\u00fd identifik\u00e1tor pou\u017e\u00edvate\u013ea (UID), prim\u00e1rnu skupinu (GID) a v\u0161etky pridru\u017een\u00e9 skupiny. Je to d\u00f4le\u017eit\u00e9 pre zistenie, \u010di m\u00e1te pr\u00edstup k \u0161pecifick\u00fdm syst\u00e9mov\u00fdm zdrojom alebo pr\u00e1vam.<\/li>\n\n\n\n<li><code>groups <\/code>\u2013 vyp\u00ed\u0161e men\u00e1 v\u0161etk\u00fdch skup\u00edn, ktor\u00fdch ste \u010dlenom. Napr\u00edklad skupina sudo je na Ubuntu syst\u00e9moch predvolen\u00e1 pre pou\u017e\u00edvate\u013eov s opr\u00e1vneniami spr\u00e1vcu (root pr\u00edstup).<\/li>\n<\/ul>\n\n\n\n<p>Poznanie va\u0161ej identity a opr\u00e1vnen\u00ed v\u00e1m umo\u017en\u00ed ur\u010di\u0165, <strong>\u010do m\u00f4\u017eete a nem\u00f4\u017eete robi\u0165 v syst\u00e9me<\/strong>. Ak nem\u00e1te opr\u00e1vnenia spr\u00e1vcu (napr. nie ste v skupine sudo), nebudete m\u00f4c\u0165 meni\u0165 syst\u00e9mov\u00e9 nastavenia ani spravova\u0165 slu\u017eby. Z\u00e1rove\u0148, ak by ste n\u00e1hodou boli prihl\u00e1sen\u00fd ako root (u\u017e\u00edvate\u013e s najvy\u0161\u0161\u00edmi opr\u00e1vneniami na v\u0161etko), mali by ste postupova\u0165 s ve\u013ekou opatrnos\u0165ou.<\/p>\n\n\n\n<p>Vo v\u00e4\u010d\u0161ine pr\u00edpadov b\u00fdvaj\u00fa produk\u010dn\u00e9 servery nakonfigurovan\u00e9 tak, \u017ee pou\u017e\u00edvate\u013e nem\u00e1 pln\u00fd pr\u00edstup \u2013 t\u00e1to kontrola v\u00e1m hne\u010f na za\u010diatku uk\u00e1\u017ee, <strong>\u010di je potrebn\u00e9 po\u017eiada\u0165 o roz\u0161\u00edrenie pr\u00e1v, alebo pokra\u010dova\u0165 s t\u00fdm, \u010do m\u00e1te k dispoz\u00edcii<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zoznam pou\u017e\u00edvate\u013eov<\/h2>\n\n\n\n<p><strong>Pre\u010do je d\u00f4le\u017eit\u00e9 zisti\u0165, kto m\u00e1 do syst\u00e9mu pr\u00edstup?<\/strong><\/p>\n\n\n\n<p>Ako administr\u00e1tor mus\u00edte ma\u0165 preh\u013ead o tom, <strong>kto m\u00e1 konto v syst\u00e9me a kto ho re\u00e1lne pou\u017e\u00edva<\/strong>. Ka\u017ed\u00fd akt\u00edvny pou\u017e\u00edvate\u013e predstavuje potenci\u00e1lny vektor \u00fatoku alebo aspo\u0148 zodpovednos\u0165, ktor\u00fa treba sledova\u0165 \u2013 \u010di u\u017e ide o intern\u00e9ho kolegu, slu\u017eobn\u00e9 konto alebo nie\u010do, \u010do tam nem\u00e1 \u010do robi\u0165.<\/p>\n\n\n\n<p><strong>Cie\u013eom tejto \u010dasti je overi\u0165:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>kto s\u00fa v\u0161etci pou\u017e\u00edvatelia v syst\u00e9me<\/li>\n\n\n\n<li>kto sa v poslednom \u010dase prihlasoval<\/li>\n\n\n\n<li>\u010di je moment\u00e1lne niekto akt\u00edvne prihl\u00e1sen\u00fd a \u010do rob\u00ed<\/li>\n<\/ul>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">cat \/etc\/passwd<br>last -a | head -10<br>w<\/pre>\n\n\n\n<p><strong>\u010co tieto pr\u00edkazy robia a \u010do v\u00e1m prezradia:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>cat \/etc\/passwd<\/code> \u2013 zobraz\u00ed <strong>v\u0161etk\u00fdch pou\u017e\u00edvate\u013eov<\/strong>, ktor\u00ed existuj\u00fa v syst\u00e9me. Ka\u017ed\u00fd riadok predstavuje jedn\u00e9ho pou\u017e\u00edvate\u013ea. Ak m\u00e1 pou\u017e\u00edvate\u013e ako shell uveden\u00fd \/bin\/bash alebo \/bin\/sh, ide o <strong>re\u00e1lne pou\u017e\u00edvate\u013esk\u00e9 konto<\/strong>. Naopak, kont\u00e1 s \/usr\/sbin\/nologin alebo \/bin\/false s\u00fa typicky <strong>syst\u00e9mov\u00e9 alebo servisn\u00e9 \u00fa\u010dty<\/strong>. Ak v s\u00fabore \/etc\/passwd n\u00e1jdete pou\u017e\u00edvate\u013eov, ktor\u00fdch neviete identifikova\u0165, je dobr\u00e9 si ich preveri\u0165. Najm\u00e4 ak maj\u00fa shell nastaven\u00fd na interakt\u00edvny pr\u00edstup (\/bin\/bash) \u2013 mohli by to by\u0165 <strong>zabudnut\u00e9 \u00fa\u010dty<\/strong>, ktor\u00e9 predstavuj\u00fa <strong>bezpe\u010dnostn\u00e9 riziko<\/strong>.<\/li>\n\n\n\n<li><code>last -a | head -10 <\/code>\u2013 zobraz\u00ed posledn\u00e9 prihl\u00e1senia do syst\u00e9mu. Uvid\u00edte <strong>kto sa prihl\u00e1sil<\/strong>, <strong>kedy<\/strong>, <strong>odkia\u013e (IP adresa)<\/strong> a ako dlho bol prihl\u00e1sen\u00fd. head -10 obmedz\u00ed v\u00fdpis na prv\u00fdch 10 z\u00e1znamov, \u010do v\u00e4\u010d\u0161inou sta\u010d\u00ed na r\u00fdchly preh\u013ead. Pri v\u00fdpise z last si v\u0161\u00edmajte <strong>nezvy\u010dajn\u00e9 \u010dasy a IP adresy<\/strong> \u2013 mohlo by \u00eds\u0165 o pokus o neopr\u00e1vnen\u00fd pr\u00edstup.<\/li>\n\n\n\n<li><code>w <\/code>\u2013 zobraz\u00ed, <strong>kto je pr\u00e1ve prihl\u00e1sen\u00fd<\/strong>, z akej IP adresy a ak\u00fd pr\u00edkaz aktu\u00e1lne vykon\u00e1va. Tento pr\u00edkaz je skvel\u00fd, ak potrebujete zisti\u0165, \u010di niekto syst\u00e9m akt\u00edvne vyu\u017e\u00edva \u2013 napr\u00edklad in\u00fd administr\u00e1tor alebo skript.<\/li>\n<\/ul>\n\n\n\n<p>T\u00e1to kontrola v\u00e1m pom\u00f4\u017ee zorientova\u0165 sa medzi pou\u017e\u00edvate\u013emi syst\u00e9mu, pochopi\u0165 hist\u00f3riu pr\u00edstupov a odhali\u0165 potenci\u00e1lne slabiny v spr\u00e1ve \u00fa\u010dtov. V pr\u00edpade pochybnost\u00ed sa v\u017edy oplat\u00ed vytvori\u0165 si vlastn\u00fd zoznam \u201copr\u00e1vnen\u00fdch\u201d pou\u017e\u00edvate\u013eov a pravidelne kontrolova\u0165, \u010di sa ich zoznam nemen\u00ed bez v\u00e1\u0161ho vedomia.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Z\u00e1kladn\u00e9 inform\u00e1cie o syst\u00e9me<\/h2>\n\n\n\n<p><strong>Pre\u010do je to d\u00f4le\u017eit\u00e9?<\/strong><\/p>\n\n\n\n<p>Predt\u00fdm ne\u017e za\u010dnete \u010doko\u013evek konfigurova\u0165, potrebujete vedie\u0165, <strong>na akom opera\u010dnom syst\u00e9me vlastne pracujete<\/strong>, ak\u00fd je jeho <strong>kernel<\/strong>, <strong>architekt\u00fara<\/strong>, <strong>n\u00e1zov (hostname)<\/strong> a <strong>ako dlho syst\u00e9m be\u017e\u00ed<\/strong>. Tieto \u00fadaje s\u00fa nevyhnutn\u00e9 napr\u00edklad pri:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>v\u00fdbere vhodn\u00e9ho bal\u00ed\u010dka alebo n\u00e1stroja pre dan\u00fa distrib\u00faciu<\/li>\n\n\n\n<li>komunik\u00e1cii s technickou podporou<\/li>\n\n\n\n<li>pl\u00e1novan\u00ed aktualiz\u00e1ci\u00ed alebo migr\u00e1cie<\/li>\n\n\n\n<li>hodnoten\u00ed stability syst\u00e9mu (napr. \u010di sa re\u0161tartuje pr\u00edli\u0161 \u010dasto)<\/li>\n<\/ul>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">uname -a<br>lsb_release -a<br>hostnamectl<br>uptime<\/pre>\n\n\n\n<p><strong>\u010co tieto pr\u00edkazy zobrazia a ako ich interpretova\u0165:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>uname -a <\/code>\u2013 poskytuje s\u00fahrnn\u00e9 inform\u00e1cie o syst\u00e9me: <strong>n\u00e1zov kernelu<\/strong>, verzia, <strong>typ procesora<\/strong>, architekt\u00fara (napr. x86_64) a hostname. U\u017eito\u010dn\u00e9 pri diagnostike kompatibility a architekt\u00fary syst\u00e9mu. Ak je kernel pr\u00edli\u0161 star\u00fd, m\u00f4\u017ee ch\u00fdba\u0165 podpora bezpe\u010dnostn\u00e9 z\u00e1platy.<\/li>\n\n\n\n<li><code>lsb_release -a<\/code> \u2013 na Ubuntu a in\u00fdch Debianov\u00fdch syst\u00e9moch zobraz\u00ed <strong>distrib\u00faciu, verziu, k\u00f3dov\u00e9 meno<\/strong> (napr. Ubuntu 22.04 LTS, Jammy Jellyfish). Ak sa pr\u00edkaz nen\u00e1jde, m\u00f4\u017eete ho doin\u0161talova\u0165 cez sudo apt install lsb-release.<\/li>\n\n\n\n<li><code>hostnamectl <\/code>\u2013 modern\u00fd n\u00e1stroj pre zobrazenie n\u00e1zvu stroja, opera\u010dn\u00e9ho syst\u00e9mu a kernelu. Obsahuje aj inform\u00e1cie o virtualiz\u00e1cii, \u010do je u\u017eito\u010dn\u00e9, ak si nie ste ist\u00fd, \u010di ide o fyzick\u00fd alebo virtu\u00e1lny server.<\/li>\n\n\n\n<li><code>uptime <\/code>\u2013 ukazuje, <strong>ako dlho syst\u00e9m be\u017e\u00ed bez re\u0161tartu<\/strong>, priemern\u00e9 za\u0165a\u017eenie CPU (load average) a aktu\u00e1lny \u010das. Z t\u00fdchto \u00fadajov viete vy\u010d\u00edta\u0165 stabilitu syst\u00e9mu \u2013 napr. \u010di sa re\u0161tartoval ned\u00e1vno, alebo be\u017e\u00ed nieko\u013eko t\u00fd\u017ed\u0148ov bez v\u00fdpadku. Kr\u00e1tky uptime (napr. p\u00e1r min\u00fat) m\u00f4\u017ee nazna\u010dova\u0165, \u017ee syst\u00e9m sa pr\u00e1ve re\u0161tartoval \u2013 \u010di u\u017e pl\u00e1novane, alebo z d\u00f4vodu probl\u00e9mu.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Za\u0165a\u017eenie syst\u00e9mu a vyu\u017eitie jeho zdrojov<\/h2>\n\n\n\n<p><strong>Pre\u010do je to d\u00f4le\u017eit\u00e9?<\/strong><\/p>\n\n\n\n<p>Sledovanie syst\u00e9mov\u00fdch zdrojov \u2013 ako s\u00fa disky, pam\u00e4\u0165, procesor (CPU) a vstupno-v\u00fdstupn\u00e9 oper\u00e1cie (I\/O) \u2013 je z\u00e1kladom pre ka\u017ed\u00e9ho administr\u00e1tora. Aj ke\u010f syst\u00e9m \u201ena prv\u00fd poh\u013ead be\u017e\u00ed\u201c, m\u00f4\u017ee by\u0165 za\u0165a\u017een\u00fd, nedostato\u010dne dimenzovan\u00fd alebo nespr\u00e1vne nakonfigurovan\u00fd.&nbsp;<\/p>\n\n\n\n<p>Ak syst\u00e9m zareaguje pomaly, pr\u00e1ve tu zist\u00edte, pre\u010do a ktor\u00e9 prostriedky mu ch\u00fdbaj\u00fa.<\/p>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">df -h<br>free -h<br>top<br>vmstat 1 5<br>iostat -xz 1 3  # (volite\u013ene, ak je nain\u0161talovan\u00fd bal\u00edk sysstat)<\/pre>\n\n\n\n<p><strong>\u010co tieto pr\u00edkazy robia a ako ich interpretova\u0165:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>df -h<\/code> &#8211; zobraz\u00ed <strong>vyu\u017eitie diskov\u00e9ho priestoru<\/strong>. Parameter -h znamen\u00e1 \u201chuman-readable\u201d, teda v\u00fdsledky ako 20G, 1.5T, at\u010f. Sledujte najm\u00e4 hodnotu Use% \u2013 ak niektor\u00fd disk prekra\u010duje 90 %, je \u010das kona\u0165. Obzvl\u00e1\u0161\u0165 d\u00f4le\u017eit\u00e9 s\u00fa oddiely ako \/, \/var, \/home, \/tmp.<\/li>\n\n\n\n<li><code>free -h<\/code> &#8211; r\u00fdchly preh\u013ead o <strong>pam\u00e4ti RAM a swap priestore<\/strong>. Sledujte riadok available a \u010di sa vyu\u017e\u00edva swap. Ak je RAM pln\u00e1 a swap akt\u00edvne pou\u017e\u00edvan\u00fd, syst\u00e9m m\u00f4\u017ee v\u00fdrazne spomali\u0165.<\/li>\n\n\n\n<li><code>top <\/code>&#8211; dynamick\u00fd n\u00e1stroj na zobrazenie <strong>aktu\u00e1lnych procesov<\/strong>, ich vyu\u017eitia CPU a pam\u00e4te. V horn\u00fdch riadkoch vid\u00edte <strong>celkov\u00e9 za\u0165a\u017eenie procesora<\/strong>, <strong>stav pam\u00e4te<\/strong>, <strong>po\u010det spusten\u00fdch procesov<\/strong>, a v dolnej \u010dasti zoznam \u201enajn\u00e1ro\u010dnej\u0161\u00edch\u201c aplik\u00e1ci\u00ed.<\/li>\n\n\n\n<li><code>vmstat 1 5<\/code> &#8211; uk\u00e1\u017ee detailnej\u0161\u00ed poh\u013ead na <strong>v\u00fdkon syst\u00e9mu po\u010das 5 sek\u00fand<\/strong>. Z\u00edskate preh\u013ead o CPU, swapovan\u00ed, blokovanom I\/O a in\u00fdch parametroch. Vhodn\u00e9 na sledovanie syst\u00e9mov\u00e9ho spr\u00e1vania v \u010dase.<\/li>\n\n\n\n<li><code>iostat -xz 1 3<\/code> &#8211; (ak m\u00e1te nain\u0161talovan\u00fd bal\u00edk sysstat) \u2013 zobrazuje <strong>za\u0165a\u017eenie diskov<\/strong> vr\u00e1tane pr\u00edstupov za sekundu, latencie a vy\u0165a\u017eenosti (v st\u013apci %util). St\u00e1le vysok\u00e9 hodnoty %util (nad 80\u201390 %) m\u00f4\u017eu znamena\u0165 diskov\u00fd bottleneck.<\/li>\n<\/ul>\n\n\n\n<p><strong>Na \u010do si da\u0165 pozor:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Disk pln\u00fd?<\/strong> \u2013 Slu\u017eby m\u00f4\u017eu zlyha\u0165 alebo presta\u0165 zapisova\u0165 logy. Kritick\u00fd stav hlavne pre oddiely ako \/var, kde s\u00fa logy a datab\u00e1zov\u00e9 d\u00e1ta.<\/li>\n\n\n\n<li><strong>RAM a swap?<\/strong> \u2013 Ak je swap akt\u00edvne vyu\u017e\u00edvan\u00fd, zistite, \u010di je to do\u010dasn\u00fd stav alebo systematick\u00fd probl\u00e9m (nedostatok RAM, pam\u00e4\u0165ov\u00e9 leaky).<\/li>\n\n\n\n<li><strong>CPU na maxime?<\/strong> \u2013 Sledujte, \u010di nejak\u00fd proces (napr. mysqld, java, python) dlhodobo vy\u0165a\u017euje CPU. M\u00f4\u017ee \u00eds\u0165 o chybu aplik\u00e1cie alebo o legit\u00edmne vysok\u00e9 za\u0165a\u017eenie.<\/li>\n\n\n\n<li><strong>Disk I\/O?<\/strong> \u2013 Vysok\u00e1 latencia a vyu\u017eitie disku m\u00f4\u017ee sp\u00f4sobova\u0165, \u017ee syst\u00e9m \u201ezam\u0155za\u201c. Plat\u00ed najm\u00e4 pri datab\u00e1zach a logovac\u00edch slu\u017eb\u00e1ch.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Sie\u0165 a otvoren\u00e9 porty<\/h2>\n\n\n\n<p><strong>Pre\u010do je to d\u00f4le\u017eit\u00e9?<\/strong><\/p>\n\n\n\n<p>Sie\u0165 je br\u00e1nou, cez ktor\u00fa zo a do syst\u00e9mu pr\u00fadia d\u00e1ta \u2013 aj legit\u00edmne, aj potenci\u00e1lne \u0161kodliv\u00e9. Preto ako administr\u00e1tor potrebujete vedie\u0165:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li> ak\u00e9 IP adresy a rozhrania m\u00e1 server priraden\u00e9 (napr. pre SSH pripojenie, webov\u00e9 slu\u017eby)<\/li>\n\n\n\n<li>ktor\u00e9 porty s\u00fa otvoren\u00e9 a ak\u00e1 slu\u017eba na nich po\u010d\u00fava<\/li>\n\n\n\n<li>\u010di s\u00fa slu\u017eby vystaven\u00e9 verejnosti (intern\u00e9 vs. verejn\u00e9 IP)<\/li>\n<\/ul>\n\n\n\n<p>Bez t\u00fdchto inform\u00e1ci\u00ed <strong>nem\u00f4\u017eete efekt\u00edvne zabezpe\u010di\u0165 syst\u00e9m<\/strong>, ani odhali\u0165 podozriv\u00e9 spr\u00e1vanie.<\/p>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ip a<br>ss -tuln<br>sudo ss -tulnp<\/pre>\n\n\n\n<p><strong>\u010co tieto pr\u00edkazy zobrazia a ako ich interpretova\u0165:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ip a<\/code> &#8211; zobraz\u00ed <strong>sie\u0165ov\u00e9 rozhrania<\/strong> a priraden\u00e9 <strong>IP adresy<\/strong> (napr. eth0, lo, ens33). Sledujte, \u010di m\u00e1 syst\u00e9m verejn\u00fa IP, alebo len intern\u00fa \u2013 to ovplyv\u0148uje \u00farove\u0148 zabezpe\u010denia, ktor\u00fa mus\u00edte nastavi\u0165.<\/li>\n\n\n\n<li><code>ss -tuln<\/code> &#8211; zobraz\u00ed <strong>otvoren\u00e9 porty<\/strong> v po\u010d\u00favaj\u00facom stave (LISTEN). Parametre:\n<ul class=\"wp-block-list\">\n<li>-t = TCP<\/li>\n\n\n\n<li>-u = UDP<\/li>\n\n\n\n<li>-l = iba po\u010d\u00favaj\u00face porty<\/li>\n\n\n\n<li>-n = nezobrazova\u0165 DNS n\u00e1zvy (r\u00fdchlej\u0161ie a preh\u013eadnej\u0161ie)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>sudo ss -tulnp<\/code> &#8211; to ist\u00e9, ako vy\u0161\u0161ie ale doplnen\u00e9 o -p, teda <strong>ak\u00fd proces dan\u00fd port pou\u017e\u00edva<\/strong> (napr. nginx, sshd, mysqld). Vy\u017eaduje <strong>sudo opr\u00e1vnenia<\/strong>, inak nevid\u00edte v\u0161etky detaily.<\/li>\n<\/ul>\n\n\n\n<p><strong>Pr\u00edklady v\u00fdstupu a ich v\u00fdznam:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:((\"sshd\",pid=740,fd=3))<\/pre>\n\n\n\n<p>Port 22 (SSH) po\u010d\u00fava na v\u0161etk\u00fdch IP. Je to v poriadku, ak syst\u00e9m m\u00e1 by\u0165 pr\u00edstupn\u00fd z viacer\u00fdch siet\u00ed \u2013 ale odpor\u00fa\u010dame ma\u0165 nastaven\u00fd firewall a k\u013e\u00fa\u010de.<br><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">tcp LISTEN 0 128 127.0.0.1:3306 0.0.0.0:* users:((\"mysqld\",pid=1234,fd=34))<\/pre>\n\n\n\n<p>MySQL datab\u00e1za po\u010d\u00fava <strong>len na localhost-e<\/strong> \u2013 ide\u00e1lne nastavenie pre aplik\u00e1cie be\u017eiace na tom istom serveri.<\/p>\n\n\n\n<p><strong>Na \u010do si da\u0165 pozor:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Otvoren\u00e9 porty, ktor\u00e9 nepotrebujete<\/strong> \u2013 predstavuj\u00fa bezpe\u010dnostn\u00e9 riziko. Napr\u00edklad, ak na porte 3306 po\u010d\u00fava mysqld a IP adresa je verejn\u00e1, va\u0161a datab\u00e1za je potenci\u00e1lne pr\u00edstupn\u00e1 z internetu \u2013 \u010do je <strong>pomerne nebezpe\u010dn\u00e9<\/strong> bez dodato\u010dnej ochrany.<\/li>\n\n\n\n<li><strong>Nezabezpe\u010den\u00e9 slu\u017eby<\/strong> \u2013 napr. ak be\u017e\u00ed HTTP server len na porte 80 bez HTTPS (443), alebo \u010fal\u0161ie star\u0161ie slu\u017eby ako telnet \u010di ftp<\/li>\n\n\n\n<li><strong>Slu\u017eby viazan\u00e9 na v\u0161etky IP (0.0.0.0)<\/strong> \u2013 ak nie je nutn\u00e9, nech po\u010d\u00favaj\u00fa len na 127.0.0.1 (localhost) alebo na internej sieti<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Be\u017eiace aplik\u00e1cie a procesy<\/h2>\n\n\n\n<p><strong>Pre\u010do je to d\u00f4le\u017eit\u00e9?<\/strong><\/p>\n\n\n\n<p>Be\u017eiace procesy s\u00fa to, \u010do sa v \u0148om pr\u00e1ve deje. Pomocou tejto kontroly zist\u00edte:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ktor\u00e9 aplik\u00e1cie s\u00fa spusten\u00e9 (napr. webov\u00fd server, datab\u00e1za, cron skripty)<\/li>\n\n\n\n<li>Ko\u013eko CPU a RAM spotreb\u00favaj\u00fa<\/li>\n\n\n\n<li>\u010ci sa v syst\u00e9me nenach\u00e1dza podozriv\u00fd alebo ne\u017eiaduci proces<\/li>\n<\/ul>\n\n\n\n<p><strong>Monitoring procesov v\u00e1m pom\u00f4\u017ee rie\u0161i\u0165 probl\u00e9my s v\u00fdkonom<\/strong>, identifikova\u0165 zle nap\u00edsan\u00e9 aplik\u00e1cie \u010di skripty, ako aj pred\u00eds\u0165 situ\u00e1ci\u00e1m, ke\u010f jedna aplik\u00e1cia spomal\u00ed cel\u00fd server.<\/p>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ps aux --sort=-%mem | head -10<br>ps aux --sort=-%cpu | head -10<br>top<br>htop  # (volite\u013ene, ak ho m\u00e1te nain\u0161talovan\u00fd)<\/pre>\n\n\n\n<p><strong>\u010co tieto pr\u00edkazy zobrazia a ako ich \u010d\u00edta\u0165:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ps aux --sort=-%mem | head -10 - <\/code>zobraz\u00ed <strong>10 procesov, ktor\u00e9 vyu\u017e\u00edvaj\u00fa najviac pam\u00e4te<\/strong>. Sledujte najm\u00e4:\n<ul class=\"wp-block-list\">\n<li>COMMAND \u2013 n\u00e1zov procesu<\/li>\n\n\n\n<li>%MEM \u2013 percentu\u00e1lne vyu\u017eitie RAM<\/li>\n\n\n\n<li>USER \u2013 pod ktor\u00fdm pou\u017e\u00edvate\u013eom proces be\u017e\u00ed<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>ps aux --sort=-%cpu | head -10<\/code> &#8211; podobne, ale zoraden\u00e9 pod\u013ea <strong>vy\u0165a\u017eenia CPU<\/strong>. Vhodn\u00e9 pre zachytenie procesov, ktor\u00e9 \u201c\u017eer\u00fa\u201d v\u00fdkon \u2013 napr. java, node, python, ak sa nie\u010do zacyklilo alebo be\u017e\u00ed mimo kontroly.<\/li>\n\n\n\n<li><code>top<\/code> &#8211; dynamick\u00fd v\u00fdpis syst\u00e9mov\u00e9ho za\u0165a\u017eenia a procesov. Okrem samotn\u00e9ho zoznamu procesov zobrazuje aj <strong>celkov\u00fd load syst\u00e9mu<\/strong>, <strong>vyu\u017eitie CPU pod\u013ea typu \u010dinnosti<\/strong> (u\u017e\u00edvate\u013esk\u00e9, syst\u00e9mov\u00e9, \u010dakaj\u00face na I\/O), stav pam\u00e4te a swapu.<\/li>\n\n\n\n<li><code>htop<\/code> &#8211; Grafick\u00e9 rozhranie podobn\u00e9 top, ale omnoho preh\u013eadnej\u0161ie. Umo\u017e\u0148uje triedenie, filtrovanie, \u201ezab\u00edjanie\u201c procesov (F9) a zobrazenie ka\u017ed\u00e9ho jadra CPU zvl\u00e1\u0161\u0165. Ak nie je nain\u0161talovan\u00e9: sudo apt install htop.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong><em>TIP: <\/em><\/strong><em>pre n\u00e1stroj htop m\u00e1me <\/em><a href=\"https:\/\/www.websupport.sk\/podpora\/kb\/htop-manual\/\"><em>pripraven\u00fd samostatn\u00fd n\u00e1vod<\/em><\/a><em> na jeho efekt\u00edvne pou\u017eitie<\/em><\/p>\n\n\n\n<p><strong>Na \u010do si da\u0165 pozor:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Procesy, ktor\u00e9 <strong>be\u017eia pod rootom<\/strong> a vy\u0165a\u017euj\u00fa syst\u00e9m, si zasl\u00fa\u017eia va\u0161u mimoriadnu pozornos\u0165 \u2013 mohlo by \u00eds\u0165 o chybn\u00fd skript, nespr\u00e1vne nakonfigurovan\u00fa slu\u017ebu alebo dokonca kompromit\u00e1ciu.<\/li>\n\n\n\n<li><strong>N\u00e1zvy procesov<\/strong>, ktor\u00e9 nepozn\u00e1te alebo vyzeraj\u00fa zvl\u00e1\u0161tne (napr. .\/abc, kworkerX\/0, minerd) \u2013 m\u00f4\u017eu indikova\u0165 nelegit\u00edmne \u010dinnosti ako <strong>cryptomining<\/strong> alebo pokusy o ob\u00eddenie syst\u00e9mu.<\/li>\n<\/ul>\n\n\n\n<p>Ak chcete vidie\u0165 detailn\u00e9 inform\u00e1cie o konkr\u00e9tnom procese (napr. PID 1234), pou\u017eite:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">cat \/proc\/1234\/status<\/pre>\n\n\n\n<p>Zobraz\u00ed detailn\u00e9 \u0161tatistiky vr\u00e1tane stavu, pou\u017eitej pam\u00e4te, vlastn\u00edka, aj hierarchie procesov.<br><\/p>\n\n\n\n<p>Ak chcete zisti\u0165, ktor\u00e9 porty dan\u00fd proces vyu\u017e\u00edva:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo lsof -i -P -n | grep &lt;PID&gt;<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Slu\u017eby a ich stav<\/h2>\n\n\n\n<p><strong>Pre\u010do je to d\u00f4le\u017eit\u00e9?<\/strong><\/p>\n\n\n\n<p>V Linuxovom syst\u00e9me \u010dasto be\u017eia desiatky slu\u017eieb \u2013 od \u00faplne z\u00e1kladn\u00fdch (sie\u0165, SSH, \u010dasov\u00e1 synchroniz\u00e1cia) a\u017e po aplik\u00e1cie ako datab\u00e1zy, webov\u00e9 servery, kontajnerov\u00e9 enginy a pod. Ako administr\u00e1tor potrebujete vedie\u0165:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ktor\u00e9 slu\u017eby s\u00fa moment\u00e1lne akt\u00edvne<\/li>\n\n\n\n<li>\u010ci be\u017eia bez ch\u00fdb<\/li>\n\n\n\n<li>\u010ci s\u00fa nakonfigurovan\u00e9 tak, aby sa sp\u00fa\u0161\u0165ali automaticky<\/li>\n\n\n\n<li>A hlavne: \u010di be\u017e\u00ed nie\u010do, \u010do by nemalo<\/li>\n<\/ul>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl list-units --type=service --state=running<br>systemctl status &lt;nazov-sluzby&gt;<br>systemctl is-enabled &lt;nazov-sluzby&gt;<br><\/pre>\n\n\n\n<p><strong>\u010co tieto pr\u00edkazy robia a ako ich interpretova\u0165:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>systemctl list-units --type=service --state=running<\/code> &#8211; zobraz\u00ed v\u0161etky <strong>aktu\u00e1lne be\u017eiace slu\u017eby<\/strong>. V zozname uvid\u00edte n\u00e1zov slu\u017eby, jej stav (napr. active (running)), typ zavedenia a kr\u00e1tky popis. Z\u00edskate preh\u013ead o tom, \u010do je na serveri naozaj akt\u00edvne \u2013 napr. <em>sshd.service<\/em>,<em> nginx.service<\/em>, <em>mysql.service<\/em>, at\u010f.<\/li>\n\n\n\n<li><code>systemctl status &lt;slu\u017eba&gt;<\/code> &#8211; Detailn\u00fd stav konkr\u00e9tnej slu\u017eby. Zobraz\u00ed, <strong>\u010di slu\u017eba be\u017e\u00ed<\/strong>, <strong>kedy bola spusten\u00e1<\/strong>, <strong>\u010di do\u0161lo k chyb\u00e1m<\/strong>, a uk\u00e1\u017ee aj posledn\u00e9 logy. Napr.: sudo systemctl status ssh<\/li>\n\n\n\n<li><code>systemctl is-enabled &lt;slu\u017eba&gt;<\/code> &#8211; uk\u00e1\u017ee, <strong>\u010di sa dan\u00e1 slu\u017eba sp\u00fa\u0161\u0165a automaticky pri \u0161tarte syst\u00e9mu<\/strong>. U\u017eito\u010dn\u00e9 na rozpoznanie, \u010di ide o jednorazovo spusten\u00fa slu\u017ebu, alebo je trvalo nastaven\u00e1 ako s\u00fa\u010das\u0165 syst\u00e9mu.<\/li>\n<\/ul>\n\n\n\n<p><strong>Na \u010do si da\u0165 pozor:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Be\u017eiace, ale nepotrebn\u00e9 slu\u017eby<\/strong> \u2013 ak m\u00e1te spusten\u00fd apache2, ale pou\u017e\u00edvate nginx, ide o zbyto\u010dn\u00e9 vy\u0165a\u017eenie syst\u00e9mu (a mo\u017en\u00e9 potenci\u00e1lne konflikty).<\/li>\n\n\n\n<li><strong>Slu\u017eby vo \u201efailed\u201c stave<\/strong> \u2013 vypadnut\u00e9 slu\u017eby m\u00f4\u017eu by\u0165 tich\u00e9 (nebe\u017eia, ale nesp\u00f4sobuj\u00fa hl\u00e1senia) a pritom s\u00fa kritick\u00e9 pre spr\u00e1vne fungovanie syst\u00e9mu.<\/li>\n\n\n\n<li><strong>Automaticky sp\u00fa\u0161\u0165an\u00e9 slu\u017eby, ktor\u00e9 nepotrebujete<\/strong> \u2013 predstavuj\u00fa bezpe\u010dnostn\u00e9 riziko a zbyto\u010dn\u00e9 za\u0165a\u017eenie. Odpor\u00fa\u010da sa ich vypn\u00fa\u0165:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo systemctl disable &lt;slu\u017eba&gt;<br>sudo systemctl stop &lt;slu\u017eba&gt;<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ak neviete, \u010do dan\u00e1 slu\u017eba rob\u00ed, odpor\u00fa\u010dame r\u00fdchlo vyh\u013eada\u0165 jej popis alebo pozrie\u0165 jej konfigura\u010dn\u00fd s\u00fabor (napr. v \/etc\/systemd\/system\/).<\/li>\n<\/ul>\n\n\n\n<p><strong>Tip navy\u0161e: ako z\u00edska\u0165 \u00fapln\u00fd zoznam v\u0161etk\u00fdch slu\u017eieb<\/strong><\/p>\n\n\n\n<p>Ak chcete zobrazi\u0165 v\u0161etky slu\u017eby \u2013 nielen be\u017eiace \u2013 pou\u017eite:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl list-units --type=service<\/pre>\n\n\n\n<p>Alebo e\u0161te lep\u0161ie, s detailom aj pre neakt\u00edvne slu\u017eby:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl list-unit-files --type=service<\/pre>\n\n\n\n<p>T\u00fdm z\u00edskate <strong>kompletn\u00fd preh\u013ead o v\u0161etk\u00fdch slu\u017eb\u00e1ch<\/strong>, vr\u00e1tane t\u00fdch, ktor\u00e9 s\u00fa zak\u00e1zan\u00e9 alebo \u010dakaj\u00face na aktiv\u00e1ciu.<\/p>\n\n\n\n<p><strong>Bezpe\u010dnostn\u00fd poh\u013ead:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pravidelne prech\u00e1dzajte be\u017eiace slu\u017eby a p\u00fdtajte sa: <strong>\u201cT\u00e1to slu\u017eba \u2013 naozaj ju potrebujeme?\u201d<\/strong><\/li>\n\n\n\n<li>Ka\u017ed\u00e1 spusten\u00e1 slu\u017eba = potenci\u00e1lny vstupn\u00fd bod. \u010c\u00edm menej ich be\u017e\u00ed, t\u00fdm jednoduch\u0161ie sa syst\u00e9m chr\u00e1ni.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Bezpe\u010dnostn\u00e9 prvky a konfigur\u00e1cia<\/h2>\n\n\n\n<p><strong>Pre\u010do je to d\u00f4le\u017eit\u00e9?<\/strong><\/p>\n\n\n\n<p>Aj ten najv\u00fdkonnej\u0161\u00ed server je zranite\u013en\u00fd, ak nie je dobre zabezpe\u010den\u00fd. Po prvom prihl\u00e1sen\u00ed by ste mali <strong>skontrolova\u0165 z\u00e1kladn\u00e9 bezpe\u010dnostn\u00e9 nastavenia syst\u00e9mu<\/strong>, aby ste mali istotu, \u017ee:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Syst\u00e9m je chr\u00e1nen\u00fd firewallom<\/li>\n\n\n\n<li>Pr\u00edstup k nemu je obmedzen\u00fd len pre opr\u00e1vnen\u00e9 osoby<\/li>\n\n\n\n<li>Root pr\u00edstup cez SSH je zak\u00e1zan\u00fd \u2022 A ak je syst\u00e9m v produkcii, je rozumne \u201czatvoren\u00fd pred svetom\u201d<\/li>\n<\/ul>\n\n\n\n<p>Z\u00e1kladn\u00e1 bezpe\u010dnostn\u00e1 kontrola v\u00e1m pom\u00f4\u017ee pred\u00eds\u0165 <strong>be\u017en\u00fdm zranite\u013enostiam a nepozornosti<\/strong>, ktor\u00e9 s\u00fa \u010dasto d\u00f4vodom kompromit\u00e1ci\u00ed.<\/p>\n\n\n\n<p><strong>Pr\u00edkazy, ktor\u00e9 pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo ufw status<br>sudo iptables -L<br>cat \/etc\/ssh\/sshd_config | grep -Ei 'permitrootlogin|passwordauthentication'<\/pre>\n\n\n\n<p><strong>\u010co tieto pr\u00edkazy zobrazia a ako ich interpretova\u0165:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>sudo ufw status<\/code> &#8211; zobraz\u00ed stav <strong>Uncomplicated Firewallu (UFW)<\/strong> \u2013 predvolen\u00e9ho n\u00e1stroja pre Ubuntu.&nbsp;<\/li>\n\n\n\n<li><code>sudo iptables -L<\/code> &#8211; zobrazuje aktu\u00e1lne pravidl\u00e1 <strong>firewallu na ni\u017e\u0161ej \u00farovni<\/strong>. U\u017eito\u010dn\u00e9 najm\u00e4 vtedy, ak UFW nepou\u017e\u00edvate alebo pou\u017e\u00edvate vlastn\u00e9 pravidl\u00e1.<\/li>\n\n\n\n<li><code>cat \/etc\/ssh\/sshd_config | grep -Ei 'permitrootlogin|passwordauthentication' <\/code>&#8211; skontroluje kritick\u00e9 nastavenia SSH d\u00e9mona:\n<ul class=\"wp-block-list\">\n<li><code>PermitRootLogin no <\/code>\u2013 odpor\u00fa\u010dan\u00e9 nastavenie.<\/li>\n\n\n\n<li><code>PasswordAuthentication no <\/code>\u2013 ak pou\u017e\u00edvate len SSH k\u013e\u00fa\u010de (bez hesiel), \u010do je bezpe\u010dnej\u0161ie.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Na \u010do si da\u0165 pozor:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Povolen\u00fd root login cez SSH<\/strong> \u2013 predstavuje ve\u013ek\u00e9 riziko, preto\u017ee \u00fato\u010dn\u00edci \u010dasto automatizovane cielia priamo na root \u00fa\u010det. Zak\u00e1\u017ete ho.<\/li>\n\n\n\n<li><strong>SSH pr\u00edstup cez hesl\u00e1<\/strong> \u2013 ak je mo\u017en\u00fd login len pomocou hesla, riskujete \u00fatoky typu brute-force. Odpor\u00fa\u010da sa vypn\u00fa\u0165 hesl\u00e1 a povoli\u0165 len autentifik\u00e1ciu cez verejn\u00e9 k\u013e\u00fa\u010de.<\/li>\n<\/ul>\n\n\n\n<p>Nezab\u00fadajte, \u017ee vo v\u0161eobecnosti bezpe\u010dnostn\u00e1 konfigur\u00e1cia nie je jednorazov\u00e1 \u00faloha \u2013 je to <strong>neust\u00e1ly proces<\/strong>. Ale t\u00e1to prvotn\u00e1 kontrola po prihl\u00e1sen\u00ed v\u00e1m d\u00e1 <strong>jasn\u00fd obraz o tom, ako ve\u013emi (ne)bezpe\u010dn\u00fd syst\u00e9m je<\/strong>, a kde treba za\u010da\u0165 s jeho hardeningom.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u010casov\u00e1 z\u00f3na a synchroniz\u00e1cia \u010dasu<\/h2>\n\n\n\n<p><strong>Pre\u010do je to d\u00f4le\u017eit\u00e9?<\/strong><\/p>\n\n\n\n<p>Spr\u00e1vne nastaven\u00fd \u010das je <strong>kritick\u00fd pre spr\u00e1vnu prev\u00e1dzku syst\u00e9mu<\/strong>, hlavne:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pri <strong>analyzovan\u00ed logov<\/strong> (napr. po incidente),<\/li>\n\n\n\n<li>pre <strong>bezpe\u010dnostn\u00e9 mechanizmy<\/strong> ako autentifika\u010dn\u00e9 tokeny (napr. 2FA, Kerberos),<\/li>\n\n\n\n<li>pre <strong>\u010dasovan\u00e9 \u00falohy (cron)<\/strong>, ktor\u00e9 by sa inak sp\u00fa\u0161\u0165ali v inom \u010dase,<\/li>\n\n\n\n<li>pri <strong>synchroniz\u00e1cii medzi viacer\u00fdmi servermi<\/strong> (napr. datab\u00e1za, webserver, storage).<\/li>\n<\/ul>\n\n\n\n<p>Zle nastaven\u00fd \u010das m\u00f4\u017ee sp\u00f4sobi\u0165 <strong>\u0165a\u017eko odhalite\u013en\u00e9 chyby<\/strong>, probl\u00e9my pri synchroniz\u00e1cii s\u00faborov alebo nekonzistentn\u00e9 spracovanie \u00fadajov.<\/p>\n\n\n\n<p><strong>Pr\u00edkaz, ktor\u00fd pou\u017eijete:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">timedatectl<\/pre>\n\n\n\n<p><strong>\u010co tento pr\u00edkaz zobraz\u00ed a ako ho \u010d\u00edta\u0165:<\/strong><\/p>\n\n\n\n<p>V\u00fdstup m\u00f4\u017ee vyzera\u0165 napr\u00edklad takto:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"> Local time: Sun 2025-03-30 14:45:01 CEST<br>           Universal time: Sun 2025-03-30 12:45:01 UTC<br>                 RTC time: Sun 2025-03-30 12:45:01<br>                Time zone: Europe\/Bratislava (CEST, +0200)<br>System clock synchronized: yes<br>              NTP service: active<br>          RTC in local TZ: no<\/pre>\n\n\n\n<p>Zamerajte sa na tieto riadky:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Time zone<\/strong> \u2013 aktu\u00e1lne nastaven\u00e1 \u010dasov\u00e1 z\u00f3na (napr. Europe\/Bratislava). Ak server be\u017e\u00ed v inej lokalite, m\u00f4\u017ee by\u0165 vhodn\u00e9 pou\u017ei\u0165 UTC, najm\u00e4 na produk\u010dn\u00fdch syst\u00e9moch, aby sa predi\u0161lo nejasnostiam.<\/li>\n\n\n\n<li><strong>System clock synchronized: yes<\/strong> \u2013 znamen\u00e1, \u017ee syst\u00e9mov\u00fd \u010das je synchronizovan\u00fd s extern\u00fdmi \u010dasov\u00fdmi servermi (NTP). Ak tu vid\u00edte no, je \u010das to opravi\u0165.<\/li>\n\n\n\n<li><strong>NTP service: active<\/strong> \u2013 ukazuje, \u010di je slu\u017eba na synchroniz\u00e1ciu \u010dasu (zvy\u010dajne systemd-timesyncd) akt\u00edvna. Ak nie je, \u010das sa m\u00f4\u017ee postupne rozch\u00e1dza\u0165.<\/li>\n<\/ul>\n\n\n\n<p><strong>Na \u010do si da\u0165 pozor:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Neakt\u00edvna synchroniz\u00e1cia<\/strong> \u2013 ak System clock synchronized alebo NTP service ukazuj\u00fa no alebo inactive, odpor\u00fa\u010da sa aktivova\u0165 \u010dasov\u00fd d\u00e9mon:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo timedatectl set-ntp true<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Nespr\u00e1vna \u010dasov\u00e1 z\u00f3na<\/strong> \u2013 ak s\u00fa logy posunut\u00e9 o nieko\u013eko hod\u00edn, m\u00f4\u017ee to by\u0165 d\u00f4sledok nespr\u00e1vne nastavenej z\u00f3ny. Zmeni\u0165 ju viete napr\u00edklad takto:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo timedatectl set-timezone Europe\/Bratislava<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>RTC in local TZ: yes<\/strong> \u2013 niektor\u00e9 servery maj\u00fa hardv\u00e9rov\u00e9 hodiny (RTC) nastaven\u00e9 na lok\u00e1lny \u010das namiesto UTC, \u010do m\u00f4\u017ee sp\u00f4sobi\u0165 zm\u00e4tky po re\u0161tarte alebo pri prepnut\u00ed medzi letn\u00fdm a zimn\u00fdm \u010dasom.<\/li>\n<\/ul>\n\n\n\n<p>Ak si chcete overi\u0165, <strong>s ktor\u00fdm serverom sa \u010das synchronizuje<\/strong>, pou\u017eite:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl status systemd-timesyncd<\/pre>\n\n\n\n<p>Na serveroch, ktor\u00e9 pracuj\u00fa v glob\u00e1lnom prostred\u00ed (napr. cloud, viacero d\u00e1tov\u00fdch centier), sa odpor\u00fa\u010da pou\u017e\u00edva\u0165 <strong>UTC ako \u010dasov\u00fa z\u00f3nu<\/strong>. Lok\u00e1lny \u010das je vhodn\u00fd pre desktopov\u00e9 alebo region\u00e1lne servery, kde je d\u00f4le\u017eit\u00e9, aby \u010dasy sedeli s miestnym pracovn\u00fdm re\u017eimom.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Extra odpor\u00fa\u010dania: \u010fal\u0161ie veci, ktor\u00e9 by v\u00e1s mali zauj\u00edma\u0165<\/h2>\n\n\n\n<p><strong>Pre\u010do \u00eds\u0165 e\u0161te \u010falej?<\/strong><\/p>\n\n\n\n<p>Z\u00e1kladn\u00fd audit v\u00e1m poskytne skvel\u00fd \u0161tart. No ak chcete syst\u00e9m spravova\u0165 d\u00f4sledne, bezpe\u010dne a efekt\u00edvne, oplat\u00ed sa venova\u0165 pozornos\u0165 aj <strong>doplnkov\u00fdm oblastiam<\/strong>. Tie v\u00e1m m\u00f4\u017eu prezradi\u0165:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u010di sa v syst\u00e9me objavuj\u00fa chyby alebo bezpe\u010dnostn\u00e9 hl\u00e1senia,<\/li>\n\n\n\n<li>ak\u00e9 pl\u00e1novan\u00e9 \u00falohy s\u00fa nastaven\u00e9,<\/li>\n\n\n\n<li>ak\u00e9 bal\u00ed\u010dky s\u00fa nain\u0161talovan\u00e9 a \u010di nie s\u00fa zastaran\u00e9, <\/li>\n\n\n\n<li>\u010do sa deje na pozad\u00ed v logoch alebo cron skriptoch.<\/li>\n<\/ul>\n\n\n\n<p><strong>Logy a syst\u00e9mov\u00e9 hl\u00e1senia<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">journalctl -xe<br>tail -n 100 \/var\/log\/syslog<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>journalctl -xe <\/code>\u2013 zobraz\u00ed najnov\u0161ie syst\u00e9mov\u00e9 udalosti (vr\u00e1tane ch\u00fdb, zlyhan\u00ed slu\u017eieb).<\/li>\n\n\n\n<li><code>syslog <\/code>\u2013 v\u0161eobecn\u00fd logovac\u00ed s\u00fabor, ktor\u00fd obsahuje \u0161irok\u00e9 spektrum spr\u00e1v.<\/li>\n<\/ul>\n\n\n\n<p><strong>Sledujte v\u00fdskyt slov ako fail, denied, error, unauthorized. <\/strong>Tieto spr\u00e1vy \u010dasto odhalia probl\u00e9my e\u0161te predt\u00fdm, ne\u017e sa prejavia navonok.<\/p>\n\n\n\n<p><strong>Cron \u00falohy a automatizovan\u00e9 skripty<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">crontab -l<br>ls -l \/etc\/cron.*<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>crontab -l<\/code> \u2013 vyp\u00ed\u0161e napl\u00e1novan\u00e9 \u00falohy pre aktu\u00e1lneho pou\u017e\u00edvate\u013ea.<\/li>\n\n\n\n<li><code>Adres\u00e1re \/etc\/cron.daily, \/etc\/cron.hourly<\/code> at\u010f. obsahuj\u00fa skripty, ktor\u00e9 sa sp\u00fa\u0161\u0165aj\u00fa v danom intervale.<\/li>\n<\/ul>\n\n\n\n<p><strong>Overte si, \u010do sa vykon\u00e1va automaticky.<\/strong> M\u00f4\u017eete tu n\u00e1js\u0165 napr\u00edklad skripty na z\u00e1lohovanie, synchroniz\u00e1ciu, aktualiz\u00e1cie alebo mazanie star\u00fdch logov.<\/p>\n\n\n\n<p><strong>Nain\u0161talovan\u00e9 bal\u00ed\u010dky a ich aktualiz\u00e1cie<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">dpkg -l | less<br>apt list --upgradable<br><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>dpkg -l <\/code>\u2013 zoznam v\u0161etk\u00fdch nain\u0161talovan\u00fdch bal\u00ed\u010dkov.<\/li>\n\n\n\n<li><code>apt list --upgradable<\/code> \u2013 zist\u00ed, ktor\u00e9 bal\u00ed\u010dky \u010dakaj\u00fa na aktualiz\u00e1ciu.<\/li>\n<\/ul>\n\n\n\n<p><strong>Kto m\u00e1 sudo pr\u00e1va?<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">getent group sudo<\/pre>\n\n\n\n<p>Uk\u00e1\u017ee, ktor\u00ed pou\u017e\u00edvatelia maj\u00fa <strong>administr\u00e1torsk\u00e9 opr\u00e1vnenia cez sudo<\/strong>. Je vhodn\u00e9 si ich zap\u00edsa\u0165 a pravidelne kontrolova\u0165, \u010di nepribudol niekto neautorizovane.<\/p>\n\n\n\n<p><strong>Nezvy\u010dajn\u00e9 s\u00fabory v root adres\u00e1ri alebo domovsk\u00fdch prie\u010dinkoch<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ls -lah \/root<br>ls -lah \/home<\/pre>\n\n\n\n<p>Sledujte podozriv\u00e9 skripty, z\u00e1hadn\u00e9 logy alebo s\u00fabory, ktor\u00e9 tam <strong>nemaj\u00fa \u010do robi\u0165<\/strong>.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Z\u00e1ver<\/h2>\n\n\n\n<p>Pre\u0161li ste naozaj komplexn\u00fdm auditom Linuxov\u00e9ho servera po prvom prihl\u00e1sen\u00ed \u2013 krok za krokom, od identity cez v\u00fdkon a\u017e po bezpe\u010dnos\u0165 a sie\u0165.&nbsp;<\/p>\n\n\n\n<p>T\u00fdmto procesom z\u00edskate jasn\u00fa kontrolu nad t\u00fdm, \u010do syst\u00e9m rob\u00ed, ako komunikuje so svetom, a \u010di je pripraven\u00fd na produk\u010dn\u00e9 nasadenie alebo \u010fal\u0161ie konfigur\u00e1cie.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ak ste sa pr\u00e1ve prihl\u00e1sili do nov\u00e9ho Linuxov\u00e9ho syst\u00e9mu (napr\u00edklad Ubuntu servera, ako je to v na\u0161om pr\u00edpade), prv\u00fdm krokom by malo by\u0165 d\u00f4kladn\u00e9 zozn\u00e1menie sa s realitou, v ktorej sa syst\u00e9m nach\u00e1dza. Ako administr\u00e1tor potrebujete r\u00fdchlo zisti\u0165, ak\u00e9 m\u00e1te opr\u00e1vnenia, kto \u010fal\u0161\u00ed k nemu pristupuje a ak\u00e9 slu\u017eby alebo&#8230;<\/p>\n","protected":false},"author":57,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[52,53,33],"ht-kb-tag":[330,381,198],"class_list":["post-31596","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-vps","ht_kb_category-dedikovane-servery","ht_kb_category-servery","ht_kb_tag-linux","ht_kb_tag-server","ht_kb_tag-ubuntu"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ubuntu Server - kompletn\u00fd preh\u013ead inform\u00e1ci\u00ed o syst\u00e9me pre administr\u00e1tora po prvom prihl\u00e1sen\u00ed - Websupport centrum podpory<\/title>\n<meta name=\"description\" content=\"Ak ste sa pr\u00e1ve prihl\u00e1sili do nov\u00e9ho Linuxov\u00e9ho syst\u00e9mu, prv\u00fdm krokom by malo by\u0165 zozn\u00e1menie sa s realitou, v ktorej sa syst\u00e9m nach\u00e1dza.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.sk\/podpora\/kb\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ubuntu Server - kompletn\u00fd preh\u013ead inform\u00e1ci\u00ed o syst\u00e9me pre administr\u00e1tora po prvom prihl\u00e1sen\u00ed - Websupport centrum podpory\" \/>\n<meta property=\"og:description\" content=\"Ak ste sa pr\u00e1ve prihl\u00e1sili do nov\u00e9ho Linuxov\u00e9ho syst\u00e9mu, prv\u00fdm krokom by malo by\u0165 zozn\u00e1menie sa s realitou, v ktorej sa syst\u00e9m nach\u00e1dza.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.websupport.sk\/podpora\/kb\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\/\" \/>\n<meta property=\"og:site_name\" content=\"Websupport centrum podpory\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-21T09:47:50+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Predpokladan\u00fd \u010das \u010d\u00edtania\" \/>\n\t<meta name=\"twitter:data1\" content=\"16 min\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.websupport.sk\\\/podpora\\\/kb\\\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\\\/\",\"url\":\"https:\\\/\\\/www.websupport.sk\\\/podpora\\\/kb\\\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\\\/\",\"name\":\"Ubuntu Server - kompletn\u00fd preh\u013ead inform\u00e1ci\u00ed o syst\u00e9me pre administr\u00e1tora po prvom prihl\u00e1sen\u00ed - Websupport centrum podpory\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.websupport.sk\\\/podpora\\\/#website\"},\"datePublished\":\"2025-04-16T08:47:07+00:00\",\"dateModified\":\"2025-05-21T09:47:50+00:00\",\"description\":\"Ak ste sa pr\u00e1ve prihl\u00e1sili do nov\u00e9ho Linuxov\u00e9ho syst\u00e9mu, prv\u00fdm krokom by malo by\u0165 zozn\u00e1menie sa s realitou, v ktorej sa syst\u00e9m nach\u00e1dza.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.websupport.sk\\\/podpora\\\/kb\\\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\\\/#breadcrumb\"},\"inLanguage\":\"sk-SK\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.websupport.sk\\\/podpora\\\/kb\\\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.websupport.sk\\\/podpora\\\/kb\\\/ubuntu-server-kompletny-prehlad-informacii-o-systeme-pre-administratora-po-prvom-prihlaseni\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.websupport.sk\\\/podpora\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ubuntu Server &#8211; 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