Watchtower自动更新 Docker 镜像与容器 - 《Docker》

github：https://github.com/containrrr/watchtower
文档：https://containrrr.dev/watchtower/
Watchtower 是一个可以实现自动更新 Docker 基础镜像与容器的实用工具。
它会拉取最新镜像并使用最初部署时相同的参数重新启动相应的容器。

# --cleanup 每次更新都会把旧的镜像清理掉
# -i --interval  更新间隔，默认300s
docker run -d \
    --name watchtower \
    -v /var/run/docker.sock:/var/run/docker.sock \
    containrrr/watchtower \
    --cleanup \
    -i 30 \
    my-image

helper

docker run --rm containrrr/watchtower -h
Usage:
  watchtower [flags]
Flags:
  -a, --api-version string                          api version to use by docker client (default "1.25")
  -c, --cleanup                                     remove previously used images after updating
  -d, --debug                                       enable debug mode with verbose logging
      --enable-lifecycle-hooks                      Enable the execution of commands triggered by pre- and post-update lifecycle hooks
  -h, --help                                        help for watchtower
  -H, --host string                                 daemon socket to connect to (default "unix:///var/run/docker.sock")
      --http-api-metrics                            Runs Watchtower with the Prometheus metrics API enabled
      --http-api-token string                       Sets an authentication token to HTTP API requests.
      --http-api-update                             Runs Watchtower in HTTP API mode, so that image updates must to be triggered by a request
      --include-restarting                          Will also include restarting containers
  -S, --include-stopped                             Will also include created and exited containers
  -i, --interval int                                poll interval (in seconds) (default 86400)
  -e, --label-enable                                watch containers where the com.centurylinklabs.watchtower.enable label is true
  -m, --monitor-only                                Will only monitor for new images, not update the containers
      --no-color                                    Disable ANSI color escape codes in log output
      --no-pull                                     do not pull any new images
      --no-restart                                  do not restart any containers
      --no-startup-message                          Prevents watchtower from sending a startup message
      --notification-email-delay int                Delay before sending notifications, expressed in seconds
      --notification-email-from string              Address to send notification emails from
      --notification-email-server string            SMTP server to send notification emails through
      --notification-email-server-password string   SMTP server password for sending notifications
      --notification-email-server-port int          SMTP server port to send notification emails through (default 25)
      --notification-email-server-tls-skip-verify   Controls whether watchtower verifies the SMTP server's certificate chain and host name.
                                                    Should only be used for testing.
      --notification-email-server-user string       SMTP server user for sending notifications
      --notification-email-subjecttag string        Subject prefix tag for notifications via mail
      --notification-email-to string                Address to send notification emails to
      --notification-gotify-tls-skip-verify         Controls whether watchtower verifies the Gotify server's certificate chain and host name.
                                                    Should only be used for testing.
      --notification-gotify-token string            The Gotify Application required to query the Gotify API
      --notification-gotify-url string              The Gotify URL to send notifications to
      --notification-msteams-data                   The MSTeams notifier will try to extract log entry fields as MSTeams message facts
      --notification-msteams-hook string            The MSTeams WebHook URL to send notifications to
      --notification-slack-channel string           A string which overrides the webhook's default channel. Example: #my-custom-channel
      --notification-slack-hook-url string          The Slack Hook URL to send notifications to
      --notification-slack-icon-emoji string        An emoji code string to use in place of the default icon
      --notification-slack-icon-url string          An icon image URL string to use in place of the default icon
      --notification-slack-identifier string        A string which will be used to identify the messages coming from this watchtower instance (default "watchtower")
      --notification-template string                The shoutrrr text/template for the messages
      --notification-url stringArray                The shoutrrr URL to send notifications to
  -n, --notifications strings                        notification types to send (valid: email, slack, msteams, gotify, shoutrrr)
      --notifications-level string                  The log level used for sending notifications. Possible values: panic, fatal, error, warn, info or debug (default "info")
      --remove-volumes                              remove attached volumes before updating
      --revive-stopped                              Will also start stopped containers that were updated, if include-stopped is active
      --rolling-restart                             Restart containers one at a time
  -R, --run-once                                    Run once now and exit
  -s, --schedule string                             the cron expression which defines when to update
      --scope string                                Defines a monitoring scope for the Watchtower instance.
  -t, --stop-timeout duration                       timeout before a container is forcefully stopped (default 10s)
  -v, --tlsverify                                   use TLS and verify the remote
      --trace                                       enable trace mode with very verbose logging - caution, exposes credentials
      --warn-on-head-failure string                 When to warn about HEAD pull requests failing. Possible values: always, auto or never

安装 mysql
mysql：
数据存储位置：/var/lib/mysql

MYSQL_ROOT_PASSWORD：密码
MYSQL_DATABASE：创建数据库
MYSQL_ALLOW_EMPTY_PASSWORD：允许空密码

构建wordpress：

docker run -d --name mysql -v mysql-data:/var/lib/mysql5.7  -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=wordpress mysql:5.7
docker run -d --name wordpress --link mysql -e WORDPRESS_DB_HOST=mysql:3306 -p 80:80 wordpress