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记docker容器内volume mount实时更新

akazwz
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记docker 容器内 volume mount 实时更新

一.查看容器配置

docker inspect [container id or name]
 "Mounts": [
            {
                "Type": "bind",
                "Source": "D:\\workspace\\dracohub",
                "Destination": "/app",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "bind",
                "Source": "D:\\workspace\\dracohub\\deploy\\php.ini",
                "Destination": "/opt/bitnami/php/conf/php.ini",
                "Mode": "",
                "RW": false,
                "Propagation": "rprivate"
            }
        ],

Propagation 的值为 rprivate , 文件夹不实时同步的原因就是因为这个,官方文档有个表格,我贴在这里

Propagation settingDescription
sharedSub-mounts of the original mount are exposed to replica mounts, and sub-mounts of replica mounts are also propagated to the original mount.
slavesimilar to a shared mount, but only in one direction. If the original mount exposes a sub-mount, the replica mount can see it. However, if the replica mount exposes a sub-mount, the original mount cannot see it.
privateThe mount is private. Sub-mounts within it are not exposed to replica mounts, and sub-mounts of replica mounts are not exposed to the original mount.
rsharedThe same as shared, but the propagation also extends to and from mount points nested within any of the original or replica mount points.
rslaveThe same as slave, but the propagation also extends to and from mount points nested within any of the original or replica mount points.
rprivateThe default. The same as private, meaning that no mount points anywhere within the original or replica mount points propagate in either direction.

我大体上翻译一下:

设置类型Description
shared任何挂载了此目录的容器都会双向和宿主机实时更新,作用范围当前目录,不包括子目录
slave任何挂载了此目录的容器都会收到实时更新,更新是单向的; 宿主机到容器,作用范围当前目录,不包括子目录
private任何挂载了此目录的容器都不会收到实时更新
rshared同 shared, 作用范围也包括子目录
rslave同 slave, 作用范围也包括子目录
rprivate同 private, 作用范围也包括子目录

二.解决方法

我们本地开发的时候是想要文件能够同步实时更新的,所以需要设置为 rslave.

  1. docker 启动时可以直接命令配置为 rslave
 docker run -d \
  -it \
  --name devtest \
  --mount type=bind,source="$(pwd)"/target,target=/app \
  --mount type=bind,source="$(pwd)"/target,target=/app2,readonly,bind-propagation=rslave \
  nginx:latest
  1. 使用 docker-compose up 时可以修改配置文件 docker-compose.yml
volumes:
      - type: bind
        source: ./
        target: /app
        read_only: false
        bind:
          propagation: rslave
      - type: bind
        source: ./deploy/php.ini
        target: /opt/bitnami/php/conf/php.ini
        read_only: true
        bind:
          propagation: rslave

volumes 不使用简写,这些配置就可以, 配置好了再看一下容器属性

"Mounts": [
            {
                "Type": "bind",
                "Source": "D:\\workspace\\dracohub",
                "Destination": "/app",
                "Mode": "",
                "RW": true,
                "Propagation": "rslave"
            },
            {
                "Type": "bind",
                "Source": "D:\\workspace\\dracohub\\deploy\\php.ini",
                "Destination": "/opt/bitnami/php/conf/php.ini",
                "Mode": "",
                "RW": false,
                "Propagation": "rslave"
            }
        ],

这样的话文件就是实时更新的,但是是单向的,是从宿主机到容器,想改成什么可以根据自己需求.

对这次的docker 文件夹实时更新的配置做个记录,希望能帮到大家.

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