Docker Config 教程

在集群环境中配置文件的分发，可以通过将配置文件放入镜像中、设置环境变量、挂载volume、挂载目录的方式，当然也可以通过 docker config 来管理集群中的配置文件，这样的方式也更加通用。

# docker config

基础命令

$ docker config --help
Usage:  docker config COMMAND

Manage Swarm configs  # 管理 集群 配置

Commands:
  create      Create a config from a file or STDIN  # 从文件或标准输入创建config
  inspect     Display detailed information on one or more configs  # 查看config详细信息
  ls          List configs # 查看config列表
  rm          Remove one or more configs  #删除config

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# 创建 config

从文件创建

$ vi default.conf
server {
    listen       88;
    server_name  localhost;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }
}

$ docker config create conf-1 default.conf

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从标准输入创建

$ echo "listen 80" | docker config create conf-2  -

# 查看 config

简单查看

$ docker config ls
ID                          NAME                CREATED             UPDATED
je21ykql9tzebr0j2v7ep0kat   conf-1                7 minutes ago       7 minutes ago
nvzeahpik5itq7mrvad08pap6   conf-2               7 seconds ago       7 seconds ago

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查看详细信息

$ docker config inspect conf-1
[
    {
        "ID": "je21ykql9tzebr0j2v7ep0kat",
        "Version": {
            "Index": 170
        },
        "CreatedAt": "2021-12-08T22:12:31.543232369Z",
        "UpdatedAt": "2021-12-08T22:12:31.543232369Z",
        "Spec": {
            "Name": "conf-1",
            "Labels": {},
            "Data": "c2VydmVyIHsKICAgIGxpc3RlbiAgICAgICA4ODsKICAgIHNlcnZlcl9uYW1lICBsb2NhbGhvc3Q7CgogICAgbG9jYXRpb24gLyB7CiAgICAgICAgcm9vdCAgIC91c3Ivc2hhcmUvbmdpbngvaHRtbDsKICAgICAgICBpbmRleCAgaW5kZXguaHRtbCBpbmRleC5odG07CiAgICB9Cn0K"
        }
    }
]

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查看详细信息并使用base64解码

$ docker config inspect -f '{{json .Spec.Data}}' conf-1 | cut -d '"' -f2 | base64 -d
server {
    listen       88;
    server_name  localhost;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }
}

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# 删除 config

删除
```
$ docker config rm conf-2
conf2
```
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# demo

使用nginx镜像创建容器，并使用docker config

$ docker service create --name nginx-01 --config source=conf,target=/etc/nginx/conf.d/default.conf -p 90:88 nginx:latest

pocy3ph88gy7ng9g2lbq9jvnw
overall progress: 1 out of 1 tasks 
1/1: running   [==================================================>] 
verify: Service converged

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上次更新: 2023/12/06, 22:30:32

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