事情起因

　　一直不知道已经部署完正在运行的Docker怎么更新，所以就搜索了下如何自动更新Dorker。果然有大神写了。
　　于是就尝试如下。教程地址：https://p3terx.com/archives/docker-watchtower.html

一、通过SSH进入群晖，运行以下代码

　　TZ是设置时区。interval是设置检查时间间隔。意思就是60s后开始检查。然后查看日志，如果有运行，就把interval改成86400，一天。

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docker run -d \
    --name watchtower \
    --restart unless-stopped \
    -e TZ="Asia/Shanghai" \
    -v /var/run/docker.sock:/var/run/docker.sock \
    containrrr/watchtower -c \
    --interval 60

日志如下：

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time="2022-07-24T09:08:22+08:00" level=info msg="Watchtower 1.4.0"
time="2022-07-24T09:08:22+08:00" level=info msg="Checking all containers (except explicitly disabled with label)"
time="2022-07-24T09:08:22+08:00" level=info msg="Using no notifications"
time="2022-07-24T09:08:22+08:00" level=info msg="Scheduling first run: 2022-07-24 10:08:22 +0800 CST"
time="2022-07-24T09:08:22+08:00" level=info msg="Note that the first check will be performed in 59 minutes, 59 seconds"
time="2022-07-24T10:08:30+08:00" level=info msg="Session done" Failed=0 Scanned=3 Updated=0 notify=no

二、改为1天检查一次。

　　把interval数值改为86400。

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docker run -d \
    --name watchtower \
    --restart unless-stopped \
    -e TZ="Asia/Shanghai" \
    -v /var/run/docker.sock:/var/run/docker.sock \
    containrrr/watchtower -c \
    --interval 86400

三、使用compose文件设定更新

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version: "3"
services:
    watchtower:
        container_name: watchtower
        environment:
            - TZ=Asia/Shanghai
            - WATCHTOWER_NOTIFICATIONS=email
            - WATCHTOWER_NOTIFICATION_EMAIL_FROM=邮箱
            - WATCHTOWER_NOTIFICATION_EMAIL_TO=目的地邮箱
            - WATCHTOWER_NOTIFICATION_EMAIL_SERVER=smtp.163.com
            - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=465
            - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=邮箱
            - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=邮箱密码
            - WATCHTOWER_NOTIFICATION_EMAIL_DELAY=2
        restart: always
        volumes:
            - /var/run/docker.sock:/var/run/docker.sock
        image: containrrr/watchtower:latest
        command: -ce --schedule "0 0,30,40 7,9,11,12,16,21,22 * * ? "
        labels:
            - "com.centurylinklabs.watchtower.enable=true"