前言

找了很多资料包括官网¹都没有发现比较清楚的配置registry的方法，自己摸索了半天发现其实通过简单设置就能够配置好Container Registry。

之所以在题目中说明http访问是由于之前在配置安装本地gitlab时也是配置的http访问原文为《gitlab使用docker简单快速部署》，在此基础上如何简单配置好registry用来保存ci打包好的镜像便是这篇文章主要内容

一、Registry是什么

Docker Registry是一个用于存储和分发Docker镜像的服务器应用程序。它可以让开发人员轻松分享和管理他们的Docker镜像，并让其他人轻松访问和下载这些镜像。Docker Registry可以运行在本地网络或公共云服务上，并提供了多种可选择的存储后端，如Amazon S3、Google Cloud Storage和Azure Blob Storage等。同时，Docker Registry还提供了认证、授权和安全方面的功能，使得开发人员可以更加安全地管理和共享他们的镜像。

Docker提供了Docker Registry工具，可以用于构建私有镜像仓库，gitlab在使用docker配置安装时其实也能简单同时搭建好一个registry用来保存你在编译过程中打包的镜像。

简单的来说就是一个镜像保存服务器，并且gitlab配置的这个服务器还能使用本地gitlab用户名和密码登陆，CI在打包时也能很方便的将镜像推送到镜像服务器做保存。

二、步骤

配置gitlab.rb文件

你所需要修改的只有如下几行，

# 注意这里是http,地址写你的本地路由地址，前边加registry
registry_external_url 'http://registry.gitlab.example.com'
gitlab_rails['registry_enabled'] = true
# 如前
gitlab_rails['registry_host'] = "registry.gitlab.example.com"
# 这里写你想保存的路径，注意这里写的是容器内的路径
gitlab_rails['registry_path'] = "/var/opt/gitlab/gitlab-rails/shared/registry"

较完整这一块的配置如下：

...

# gitlab_rails['redis_yml_override'] = nil

################################################################################
## Container Registry settings
##! Docs: https://docs.gitlab.com/ee/administration/packages/container_registry.html
################################################################################

registry_external_url 'http://registry.gitlab.example.com'

### Settings used by GitLab application
gitlab_rails['registry_enabled'] = true
gitlab_rails['registry_host'] = "registry.gitlab.example.com"
#gitlab_rails['registry_port'] = "5050"
gitlab_rails['registry_path'] = "/var/opt/gitlab/gitlab-rails/shared/registry"

# Notification secret, it's used to authenticate notification requests to GitLab application
# You only need to change this when you use external Registry service, otherwise
# it will be taken directly from notification settings of your Registry
# gitlab_rails['registry_notification_secret'] = nil

###! **Do not change the following 3 settings unless you know what you are
###!   doing**
# gitlab_rails['registry_api_url'] = "http://192.168.1.90:5005"
# gitlab_rails['registry_key_path'] = "/var/opt/gitlab/gitlab-rails/certificate.key"
# gitlab_rails['registry_issuer'] = "omnibus-gitlab-issuer"

### Settings used by Registry application
#registry['enable'] = true
# registry['username'] = "registry"
# registry['group'] = "registry"
# registry['uid'] = nil
# registry['gid'] = nil

...

修改docker-compose.yaml文档

代码如下：

# docker-compose.yml
services:
  web:
    image: 'gitlab/gitlab-ee:15.11.2-ee.0'
    restart: always
    hostname: 'gitlab.example.com'
    container_name: gitlab
    environment:
      GITLAB_OMNIBUS_CONFIG: |
        external_url 'http://gitlab.example.com'
        # Add any other gitlab.rb configuration here, each on its own line
        # NOTICE！ here change to 'http' instead of 'https'
    ports:
      - '80:80'
      - '443:443'
      - '22:22'
      - '5000:5000'
      # 这里增加了5000端口
    volumes:
      - '$GITLAB_HOME/config:/etc/gitlab'
      - '$GITLAB_HOME/logs:/var/log/gitlab'
      - '$GITLAB_HOME/data:/var/opt/gitlab'
    shm_size: '256m'
version: '3.6'

使用docker-compose restart即可重启容器完成配置。

成功运行后结果如下所示：

验证推送镜像

$ docker pull busybox
$ docker login registry.gitlab.***.com
Username: *
Password: 
WARNING! Your password will be stored unencrypted in /home/dev/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
$ docker tag busybox:latest registry.gitlab.***.com/common/fc_robot_resources:latest
$ docker push registry.gitlab.***.com/common/fc_robot_resources:latest 
The push refers to repository [registry.gitlab.***.com/common/fc_robot_resources]
9547b4c33213: Pushed 
latest: digest: sha256:5cd3db04b8be5773388576a83177aff4f40a03457a63855f4b9cbe30542b9a43 size: 528

即可成功推送，这时gitlab上也可以看到对应的打包镜像。

注意：
如果docker login报错Error response from daemon: Get "https://registry.gitlab.***.com/v2/": dial tcp 192.168.1.1:443: connect: connection refused可以参考如下文章解决《docker使用http服务及国内镜像加速》

总结

以上就是所有的内容，本文通过简单的流程和图示按步实现了Gitlab Container Registry的配置。