{"id":16764,"date":"2020-11-06T13:37:18","date_gmt":"2020-11-06T12:37:18","guid":{"rendered":"https:\/\/www.websupport.sk\/podpora\/?post_type=ht_kb&p=16764"},"modified":"2021-01-11T14:48:03","modified_gmt":"2021-01-11T13:48:03","slug":"docker-network","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.sk\/podpora\/kb\/docker-network\/","title":{"rendered":"Docker – 4. Network (sie\u0165)"},"content":{"rendered":"\n

Network<\/strong> (sie\u0165) umo\u017enuje prepoji\u0165 porty z vn\u00fatra kontajnera do hostite\u013esk\u00e9ho syst\u00e9mu a vytv\u00e1ra\u0165 siete medzi kontajnermi.<\/p>\n\n\n\n

Tip: Docker be\u017e\u00ed v\u00fdborne vo WebSupport VPS<\/a><\/strong>. Vysk\u00fa\u0161ajte pr\u00e9miov\u00fd virtu\u00e1lny server e\u0161te dnes.<\/p>\n\n\n\n

Otvorenie portu pre hostite\u013esk\u00fd syst\u00e9m<\/h2>\n\n\n\n

V predo\u0161lej \u010dasti sme si uk\u00e1zali zdie\u013eanie d\u00e1t (volume)<\/a>. Otvori\u0165 sa tie\u017e m\u00f4\u017ee port, na ktorom prebieha sie\u0165ov\u00e1 komunik\u00e1cia. Napr\u00edklad webov\u00fd server Nginx prij\u00edma dopyty na porte \u010d\u00edslo 80<\/code>, ale zatia\u013e iba v kontajneri. Presunieme sa do prie\u010dinka ~\/docker-test<\/code> (prv\u00fd riadok) a tam s nezmenen\u00fdm konfigura\u010dn\u00fdm s\u00faborom Dockerfile<\/code> zostav\u00edme (druh\u00fd riadok) a spust\u00edme (tret\u00ed riadok) kontajner s n\u00e1zvom nginx-test<\/code>, podobne ako v predo\u0161lej \u010dasti. <\/p>\n\n\n\n

Tentokr\u00e1t ale e\u0161te v tre\u0165om riadku prid\u00e1me nastavenie -p 80:80<\/code>, ktor\u00e9 komunik\u00e1ciu na porte 80<\/code> v kontajneri (\u010d\u00edslo pred<\/em> dvojbodkou) zverejn\u00ed aj na porte 8080<\/code> na hostite\u013eskom syst\u00e9me (\u010d\u00edslo za<\/em> dvojbodkou):<\/p>\n\n\n\n

cd ~\/docker-test<\/pre>\n\n\n\n
docker build -t nginx-test .<\/pre>\n\n\n\n
docker run -d -v ~\/docker-test\/html:\/usr\/share\/nginx\/html -p 80:8080 nginx-test<\/pre>\n\n\n\n
Odteraz sa u\u017e nemus\u00edme prihlasova\u0165 do kontajnera, aby sme cez webov\u00fd server Nginx na\u010d\u00edtali obsah s\u00faboru index.html<\/code> z prie\u010dinka ~\/docker-test\/html<\/code>. Sta\u010d\u00ed, ke\u010f na hostite\u013eskom syst\u00e9me spust\u00edme pr\u00edkaz:<\/p>\n\n\n\n
curl localhost:8080<\/pre>\n\n\n\n
Obsah s\u00faboru index.html<\/code> je teraz pr\u00edstupn\u00fd z kontajnera a tie\u017e z hostite\u013esk\u00e9ho po\u010d\u00edta\u010da. <\/p>\n\n\n\n
Ak ale potrebujeme zabezpe\u010di\u0165, aby kontajner dok\u00e1zal komunikova\u0165 aj s in\u00fdmi kontajnermi (nie len s hostite\u013esk\u00fdm syst\u00e9mom), siahneme po konfigur\u00e1cii siete (network).<\/p>\n\n\n\n
Sie\u0165 medzi kontajnermi<\/h2>\n\n\n\n
V\u010faka sieti (network) dok\u00e1\u017eeme vytvori\u0165 izolovan\u00fd kan\u00e1l, na ktorom s\u00fa schopn\u00e9 kontajnery medzi sebou komunikova\u0165. Be\u017ene sa tak\u00fdto kan\u00e1l vyu\u017e\u00edva napr\u00edklad vtedy, ke\u010f v jednom kontajneri m\u00e1me spusten\u00fd webov\u00fd server a v druhom zase datab\u00e1zov\u00fd server. Ak webov\u00fd server z prv\u00e9ho kontajnera potrebuje z\u00edska\u0165 \u00fadaje z datab\u00e1zy z druh\u00e9ho kontajnera, mus\u00edme oba kontajnery zaradi\u0165 pod rovnak\u00fa sie\u0165. My si to ale zjednodu\u0161\u00edme a budeme pracova\u0165 iba s kontajnermi webov\u00e9ho servera Nginx. Vytvorme si teda sie\u0165 pod n\u00e1zvom siet-test<\/code>:<\/p>\n\n\n\n
docker network create siet-test<\/pre>\n\n\n\n
Over\u00edme si, \u010di sa sie\u0165 vytvorila:<\/p>\n\n\n\n
docker network ls<\/pre>\n\n\n\n
Zostav\u00edme a spust\u00edme 2 kontajneri pod n\u00e1zvami nginx-test-1<\/code> (prv\u00e9 2 riadky) a nginx-test-2<\/code> (posledn\u00e9 2 riadky) a oba pomocou nastavenia --net=siet-test<\/code> prid\u00e1me do siete s n\u00e1zvom siet-test<\/code>. Za predpokladu, \u017ee sme v prie\u010dinku ~\/docker-test<\/code> a nezmenili sme obsah konfigura\u010dn\u00e9ho s\u00faboru Dockerfile<\/code>, spust\u00edme tieto 4 pr\u00edkazy:<\/p>\n\n\n\n
docker build -t nginx-test-1 .<\/pre>\n\n\n\n
docker run -d --net=siet-test nginx-test-1<\/pre>\n\n\n\n
docker build -t nginx-test-2 .<\/pre>\n\n\n\n
docker run -d --net=siet-test nginx-test-2<\/pre>\n\n\n\n
Zist\u00edme IP adresy kontajnerov priraden\u00fdch do siete s n\u00e1zvom siet-test<\/code>:<\/p>\n\n\n\n
docker network inspect siet-test<\/pre>\n\n\n\n
V \u010dasti Containers h\u013ead\u00e1me pri ka\u017edom z dvoch kontajnerov IPv4Address<\/code> (tu 172.18.0.2<\/code> a 172.18.0.3<\/code>, u v\u00e1s sa m\u00f4\u017eu l\u00ed\u0161i\u0165). Prv\u00e1 IP adresa patr\u00ed kontajneru nginx-test-<\/code>1 a druh\u00e1 nginx-test-2<\/code>.<\/p>\n\n\n\n
Zist\u00edme ID kontajnerov (prv\u00fd riadok; va\u0161e sa bud\u00fa l\u00ed\u0161i\u0165) a prihl\u00e1sime sa do kontajnera nginx-test-1<\/code> s IP adresou 172.18.0.2<\/code> (druh\u00fd riadok):<\/p>\n\n\n\n
docker ps<\/pre>\n\n\n\n
docker exec -it d5cef9ab1115 bash<\/pre>\n\n\n\n
Teraz u\u017e len zost\u00e1va overi\u0165, \u010di sa n\u00e1m na\u010d\u00edta s\u00fabor index.html<\/code> cez webov\u00fd server Nginx v kontajneri nginx-test-1<\/code> s IP adresou 172.18.0.2<\/code> z kontajnera nginx-test-2<\/code> s IP adresou 172.18.0.3<\/code>:<\/p>\n\n\n\n
curl 172.18.0.3<\/pre>\n\n\n\n
Ak sa zobrazil obsah s\u00faboru index.html<\/code>, znamen\u00e1 to, \u017ee oba kontajnery spolu dok\u00e1\u017eu komunikova\u0165 cez sie\u0165. Kontajner nginx-test-1<\/code> aj nginx-test-2<\/code> sme teda \u00faspe\u0161ne pridali do spolo\u010dnej izolovanej siete siet-test<\/code>, v ktorej sa vidia a dok\u00e1\u017eu si vymie\u0148a\u0165 inform\u00e1cie.<\/p>\n\n\n\n
Zhrnutie<\/h2>\n\n\n\n
Uk\u00e1zali sme si ako kontajner otvori\u0165 pomocou portu a aby kontajnery dok\u00e1zali komunikova\u0165 medzi sebou po vyhradenej vn\u00fatornej sieti.<\/p>\n","protected":false},"excerpt":{"rendered":"
Network (sie\u0165) umo\u017enuje prepoji\u0165 porty z vn\u00fatra kontajnera do hostite\u013esk\u00e9ho syst\u00e9mu a vytv\u00e1ra\u0165 siete medzi kontajnermi. Otvorenie portu pre hostite\u013esk\u00fd syst\u00e9m V predo\u0161lej \u010dasti sme si uk\u00e1zali zdie\u013eanie d\u00e1t (volume). Otvori\u0165 sa tie\u017e m\u00f4\u017ee port, na ktorom prebieha sie\u0165ov\u00e1 komunik\u00e1cia. Napr\u00edklad webov\u00fd server Nginx prij\u00edma dopyty na porte \u010d\u00edslo 80,…<\/p>\n","protected":false},"author":28,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[390],"ht-kb-tag":[336,393,396,339,381,189],"class_list":["post-16764","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-docker","ht_kb_tag-cli","ht_kb_tag-docker","ht_kb_tag-kontajnery","ht_kb_tag-open-source","ht_kb_tag-server","ht_kb_tag-vps"],"yoast_head":"\nDocker - 4. 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