Как достучаться из одного контейнера в другой в CircleCI?
Есть такая штука как CircleCI. В доках приведён пример запуска сразу двух контейнеров:
rake_test:
docker:
- image: circleci/ruby:2.4-node-jessie
- image: circleci/postgres:9.4.12-alpine
steps:
...
- run: bundle --path vendor/bundle
Как виртуалка с ruby знает, что рядом есть pg и что надо стучаться именно туда? Коллега кинул ссылку на ман по Docker Compose, но я там тоже не понял механизм именно сетевого взаимодействия.
P.S. Про докер только читал и знаю в общих чертах. В продакшене не работал.
P.P.S. Этот ответ видел, но всё равно не понятно как применять в конкретно моём случае.
Ответы (1 шт):
Автор решения: don Rumata
→ Ссылка
Всё оказалось просто и на поверхности. Оказывается у CircleCI есть первичный контейнер в котором выполняются все bash\python\php\js\etc скрипты и есть остальные котейнеры, которые доступны по сети в виде localhost:port из первичного контейнера. Всё написано тут.
Как пример - я решил попробовать связку ubuntu 18.04 и nginx.
.circleci/config.yml:
---
version: 2.1
executors:
test-bridge:
resource_class: small
docker:
- image: ubuntu:18.04
- image: nginx:latest
jobs:
run-test-bridge:
executor: test-bridge
steps:
- checkout
- run:
name: Run 2 containers 4 test local network
command: |
cat /etc/os-release
apt update
apt -y install wget
wget -O - http://localhost/
workflows:
simple-run-test:
jobs:
- run-test-bridge
Выхлоп получился такой:
NAME="Ubuntu"
VERSION="18.04.4 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.4 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic
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The following additional packages will be installed:
ca-certificates libpsl5 libssl1.1 openssl publicsuffix
The following NEW packages will be installed:
ca-certificates libpsl5 libssl1.1 openssl publicsuffix wget
0 upgraded, 6 newly installed, 0 to remove and 4 not upgraded.
Need to get 2521 kB of archives.
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debconf: delaying package configuration, since apt-utils is not installed
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(Reading database ... 4046 files and directories currently installed.)
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Setting up publicsuffix (20180223.1310-1) ...
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debconf: falling back to frontend: Teletype
Setting up openssl (1.1.1-1ubuntu2.1~18.04.6) ...
Setting up wget (1.19.4-1ubuntu2.2) ...
Setting up ca-certificates (20180409) ...
debconf: unable to initialize frontend: Dialog
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debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.)
debconf: falling back to frontend: Teletype
Updating certificates in /etc/ssl/certs...
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Running hooks in /etc/ca-certificates/update.d...
done.
--2020-05-30 21:50:35-- http://localhost/
Resolving localhost (localhost)... 127.0.0.1, 127.0.0.1, ::1
Connecting to localhost (localhost)|127.0.0.1|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 612 [text/html]
Saving to: 'STDOUT'
- 0%[ ] 0 --.-KB/s <!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
- 100%[===================>] 612 --.-KB/s in 0s
2020-05-30 21:50:35 (101 MB/s) - written to stdout [612/612]
Обратите внимание на самое начало, где у нас показывается версия бубна. Это та самая cat /etc/os-release из конфига.
И на самый конец, который показывает приветственную страницу веб-сервера. Как раз результат wget -O - http://localhost/, который по факту wget -O - http://localhost:80