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Accepted
don Rumata
Asked:2020-05-28 16:08:21 +0000 UTC2020-05-28 16:08:21 +0000 UTC

如何在 CircleCI 中从一个容器到达另一个容器？

  • 772

有这样的东西CircleCI。码头给出了一次启动两个容器的示例：

  rake_test:
    docker:
      - image: circleci/ruby:2.4-node-jessie
      - image: circleci/postgres:9.4.12-alpine
    steps:
...
      - run: bundle --path vendor/bundle

虚拟机ruby怎么知道附近有pg，需要敲门呢？一位同事抛出了Docker Compose手册页的链接，但我也不了解那里的网络交互机制。

PS 我只读过关于 docker 的知识，并且一般都知道。没有在生产中工作。

PPS我看到了这个答案，但仍然不清楚如何在我的特定情况下应用它。

linux

1 个回答

  1. Best Answer

    一切都很简单，表面上。事实证明，CircleCI有一个主容器，所有bash\python\php\js\etc脚本都在其中执行，还有其他容器可以通过网络以localhost:port 主容器的形式使用。一切都写在这里。

    例如，我决定尝试一堆ubuntu 18.04and 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

    输出是这样的：

    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.
After this operation, 7001 kB of additional disk space will be used.

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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) ...
Setting up libssl1.1:amd64 (1.1.1-1ubuntu2.1~18.04.6) ...
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
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
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
debconf: (TERM is not set, so the dialog frontend is not usable.)
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...
133 added, 0 removed; done.
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for ca-certificates (20180409) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
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]

    注意一开始，我们展示了手鼓的版本。这是cat /etc/os-release配置中的一个。

    最后，显示 Web 服务器的欢迎页面。只是结果wget -O - http://localhost/，事实上wget -O - http://localhost:80

    • 0

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