无法使用 always 策略拉取镜像

问题

无法使用 always 策略拉取镜像。

报错日志如下：

WARNING: Failed to pull image with policy "always": error pulling image configuration: download failed after attempts=6: dial tcp [2a03:2880:f11f:83:face:b00c:0:25de]:443: connect: network is unreachable (manager.go:250:108s)
ERROR: Job failed: failed to pull image "docker:latest" with specified policies [always]: error pulling image configuration: download failed after attempts=6: dial tcp [2a03:2880:f11f:83:face:b00c:0:25de]:443: connect: network is unreachable (manager.go:250:108s)

原因

config.toml 配置中的拉取策略 pull_policy 以定义运行器如何从注册表中拉取 Docker 镜像。默认为 always 即使本地镜像存在，也会拉取镜像。

查看 官网解释。

解决方法

将 /etc/gitlab-runner/config.toml 文件中 pull_policy 配置为 if-not-present。

[[runners]]
  # ......省略部分内容
  [runners.docker]
    pull_policy = ["if-not-present", "always"]
    # ......省略部分内容