{"id":785,"date":"2021-04-13T11:24:13","date_gmt":"2021-04-13T11:24:13","guid":{"rendered":"https:\/\/dev.sourcecode.sk\/wsczkb\/?post_type=ht_kb&p=785"},"modified":"2021-07-19T10:54:07","modified_gmt":"2021-07-19T08:54:07","slug":"docker-4-network-sit","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.cz\/podpora\/kb\/docker-4-network-sit\/","title":{"rendered":"Docker – 4. Network (s\u00ed\u0165)"},"content":{"rendered":"\n

Network<\/strong> (s\u00ed\u0165) umo\u017e\u0148uje propojit porty z vnit\u0159ku kontejneru do hostitelsk\u00e9ho syst\u00e9mu a vytv\u00e1\u0159et s\u00edt\u011b mezi kontejnery.<\/p>\n\n\n\n

Otev\u0159en\u00ed portu pro hostitelsk\u00fd syst\u00e9m<\/h2>\n\n\n\n

V p\u0159ede\u0161l\u00e9 \u010d\u00e1sti jsme si uk\u00e1zali sd\u00edlen\u00ed dat (volume)<\/a>. Otev\u0159\u00edt se t\u00e9\u017e m\u016f\u017ee port, na kter\u00e9m prob\u00edh\u00e1 s\u00ed\u0165ov\u00e1 komunikace. Nap\u0159\u00edklad webov\u00fd server Nginx p\u0159ij\u00edm\u00e1 dotazy na portu \u010d\u00edslo 80<\/code>, ale zat\u00edm pouze v kontejneru. P\u0159esuneme se do slo\u017eky ~\/docker-test<\/code> (prvn\u00ed \u0159\u00e1dek) a tam s nezm\u011bn\u011bn\u00fdm konfigura\u010dn\u00edm souborem Dockerfile<\/code> sestav\u00edme (druh\u00fd \u0159\u00e1dek) a spust\u00edme (t\u0159et\u00ed \u0159\u00e1dek) kontejner s n\u00e1zvem nginx-test<\/code>, podobn\u011b jako v p\u0159ede\u0161l\u00e9 \u010dasti. <\/p>\n\n\n\n

Tentokr\u00e1t ale je\u0161t\u011b ve t\u0159et\u00edm \u0159\u00e1dku p\u0159id\u00e1me nastaven\u00ed -p 80:80<\/code>, kter\u00e9 komunikaci na portu 80<\/code> v kontejneru (\u010d\u00edslo p\u0159ed<\/em> dvojte\u010dkou) zve\u0159ejn\u00ed i na portu 8080<\/code> na hostitelsk\u00e9m syst\u00e9mu (\u010d\u00edslo za<\/em> dvojte\u010dkou):<\/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
Odte\u010f se u\u017e nemus\u00edme p\u0159ihla\u0161ovat do kontejneru, abychom p\u0159es webov\u00fd server Nginx na\u010d\u00edtali obsah souboru index.html<\/code> ze slo\u017eky ~\/docker-test\/html<\/code>. Sta\u010d\u00ed, kdy\u017e na hostitelsk\u00e9m syst\u00e9mu spust\u00edme p\u0159\u00edkaz:<\/p>\n\n\n\n
curl localhost:8080<\/pre>\n\n\n\n
Obsah souboru index.html<\/code> je te\u010f p\u0159\u00edstupn\u00fd z kontejneru a t\u00e9\u017e z hostitelsk\u00e9ho po\u010d\u00edta\u010de. <\/p>\n\n\n\n
Pokud ale pot\u0159ebujeme zabezpe\u010dit, aby kontejner dok\u00e1zal komunikovat i s jin\u00fdmi kontejnery (nejen s hostitelsk\u00fdm syst\u00e9mem), s\u00e1hneme po konfiguraci s\u00edt\u011b (network).<\/p>\n\n\n\n
S\u00ed\u0165 mezi kontejnery<\/h2>\n\n\n\n
D\u00edky s\u00edti (network) dok\u00e1\u017eeme vytvo\u0159it izolovan\u00fd kan\u00e1l, na kter\u00e9m jsou schopn\u00e9 kontejnery mezi sebou komunikovat. B\u011b\u017en\u011b se takov\u00fd kan\u00e1l vyu\u017e\u00edv\u00e1 nap\u0159\u00edklad tehdy, kdy\u017e v jednom kontejneru m\u00e1me spu\u0161t\u011bn\u00fd webov\u00fd server a v druh\u00e9m zase datab\u00e1zov\u00fd server. Kdy\u017e webov\u00fd server z prvn\u00edho kontejneru pot\u0159ebuje z\u00edskat \u00fadaje z datab\u00e1ze z druh\u00e9ho kontejneru, mus\u00edme oba kontejnery za\u0159adit pod stejnou s\u00ed\u0165. My si to ale zjednodu\u0161\u00edme a budeme pracovat pouze s kontejnery webov\u00e9ho serveru Nginx. Vytvo\u0159me si tedy s\u00ed\u0165 pod n\u00e1zvem sit-test<\/code>:<\/p>\n\n\n\n
docker network create sit-test<\/pre>\n\n\n\n
Ov\u011b\u0159\u00edme si, jestli se s\u00ed\u0165 vytvo\u0159ila:<\/p>\n\n\n\n
docker network ls<\/pre>\n\n\n\n
Sestav\u00edme a spust\u00edme 2 kontejnery pod n\u00e1zvy nginx-test-1<\/code> (prvn\u00ed 2 \u0159\u00e1dky) a nginx-test-2<\/code> (posledn\u00ed 2 \u0159\u00e1dky) a oba pomoc\u00ed nastaven\u00ed --net=sit-test<\/code> p\u0159id\u00e1me do s\u00edt\u011b s n\u00e1zvem sit-test<\/code>. Za p\u0159edpokladu, \u017ee jsme ve slo\u017ece ~\/docker-test<\/code> a nezm\u011bnili jsme obsah konfigura\u010dn\u00edho souboru Dockerfile<\/code>, spust\u00edme tyto 4 p\u0159\u00edkazy:<\/p>\n\n\n\n
docker build -t nginx-test-1 .<\/pre>\n\n\n\n
docker run -d --net=sit-test nginx-test-1<\/pre>\n\n\n\n
docker build -t nginx-test-2 .<\/pre>\n\n\n\n
docker run -d --net=sit-test nginx-test-2<\/pre>\n\n\n\n
Zjist\u00edme IP adresy kontejner\u016f p\u0159i\u0159azen\u00fdch do s\u00edt\u011b s n\u00e1zvem sit-test<\/code>:<\/p>\n\n\n\n
docker network inspect sit-test<\/pre>\n\n\n\n
V \u010dasti Containers hled\u00e1me u ka\u017ed\u00e9ho ze dvou kontejner\u016f IPv4Address<\/code> (tu 172.18.0.2<\/code> a 172.18.0.3<\/code>, u v\u00e1s se mohou li\u0161it). Prvn\u00ed IP adresa pat\u0159\u00ed kontejneru nginx-test-<\/code>1 a druh\u00e1 nginx-test-2<\/code>.<\/p>\n\n\n\n
Zjist\u00edme ID kontejner\u016f (prvn\u00ed \u0159\u00e1dek; va\u0161e se budou li\u0161it) a p\u0159ihl\u00e1s\u00edme se do kontejneru nginx-test-1<\/code> s IP adresou 172.18.0.2<\/code> (druh\u00fd \u0159\u00e1dek):<\/p>\n\n\n\n
docker ps<\/pre>\n\n\n\n
docker exec -it d5cef9ab1115 bash<\/pre>\n\n\n\n
Te\u010f u\u017e jen z\u016fst\u00e1v\u00e1 ov\u011b\u0159it, jestli se n\u00e1m na\u010d\u00edt\u00e1 soubor index.html<\/code> p\u0159es webov\u00fd server Nginx v kontejneru nginx-test-1<\/code> s IP adresou 172.18.0.2<\/code> z kontejneru 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
Pokud se zobrazil obsah souboru index.html<\/code>, znamen\u00e1 to, \u017ee oba kontejnery spolu dok\u00e1\u017eu komunikovat p\u0159es s\u00ed\u0165. Kontejner nginx-test-1<\/code> i nginx-test-2<\/code> jsme tedy \u00fasp\u011b\u0161n\u011b p\u0159idali do spole\u010dn\u00e9 izolovan\u00e9 s\u00edt\u011b sit-test<\/code>, ve kter\u00e9 se vid\u00ed a dok\u00e1\u017eou si vym\u011bnit informace.<\/p>\n\n\n\n
Shrnut\u00ed<\/h2>\n\n\n\n
Uk\u00e1zali jsme si, jak kontejner otev\u0159\u00edt pomoc\u00ed portu a aby kontejnery dok\u00e1zaly komunikovat mezi sebou po vyhrazen\u00e9 vnit\u0159n\u00ed s\u00edti.<\/p>\n","protected":false},"excerpt":{"rendered":"
Network (s\u00ed\u0165) umo\u017e\u0148uje propojit porty z vnit\u0159ku kontejneru do hostitelsk\u00e9ho syst\u00e9mu a vytv\u00e1\u0159et s\u00edt\u011b mezi kontejnery. Otev\u0159en\u00ed portu pro hostitelsk\u00fd syst\u00e9m V p\u0159ede\u0161l\u00e9 \u010d\u00e1sti jsme si uk\u00e1zali sd\u00edlen\u00ed dat (volume). Otev\u0159\u00edt se t\u00e9\u017e m\u016f\u017ee port, na kter\u00e9m prob\u00edh\u00e1 s\u00ed\u0165ov\u00e1 komunikace. Nap\u0159\u00edklad webov\u00fd server Nginx p\u0159ij\u00edm\u00e1 dotazy na portu \u010d\u00edslo 80,…<\/p>\n","protected":false},"author":3,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[126],"ht-kb-tag":[],"class_list":["post-785","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-docker"],"yoast_head":"\nDocker - 4. 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