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关于mysql:如果你还在用root管理docker容器你就out了

docker 简介

Docker 提供了轻量级的虚拟化,它简直没有任何额定开销,这十分的 cool,相比于虚拟机,你能够在同一台机器上创立更多容器,而且启动 docker 容器只须要几秒钟,这是传统的虚拟机无法比拟的,这也是 docker 一经公布,就火爆互联网的起因,其利用场景十分宽泛。

docker 运行用户

很多刚刚接触 docker 的敌人,根本都是用 root 进行治理 docker 容器,如下所示

[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS                      PORTS               NAMES
ff668e421d59        mysql:5.7.28          "docker-entrypoint.s…"   38 hours ago        Exited (137) 10 hours ago                       mysql5.7.28_3307
423e39a1c866        mysql:5.7.28          "docker-entrypoint.s…"   38 hours ago        Exited (137) 10 hours ago                       mysql5.7.28_3306
30482d5580fa        mysql:5.7.28          "docker-entrypoint.s…"   7 months ago        Exited (0) 46 hours ago                         mysql_dns_5.7.28
669d7e9b8d4c        phensley/docker-dns   "./dockerdns --domai…"   7 months ago        Exited (2) 46 hours ago                         dns
b4f8d09ddf11        mysql:8.0.18          "docker-entrypoint.s…"   8 months ago        Exited (0) 10 days ago                          mysql8.0.18
c8bc897479a9        mysql:5.7.28          "docker-entrypoint.s…"   8 months ago        Exited (0) 45 hours ago                         mysql5.7.28
[root@localhost ~]# 
[root@localhost ~]# docker start ff668e421d59
ff668e421d59
[root@localhost ~]# 
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                               NAMES
ff668e421d59        mysql:5.7.28        "docker-entrypoint.s…"   38 hours ago        Up 8 seconds        33060/tcp, 0.0.0.0:3307->3306/tcp   mysql5.7.28_3307
[root@localhost ~]# 

用 root 治理容器,的确十分的不便,快捷,不过存在平安危险,因为 root 是操作系统的最高权限,docker 容器运维人员用 root 权限,如果其账号失落或者泄露,或者 docker 运维人员用 root 删除系统文件,就会造成严重后果,所以必须要做权限隔离。

那能用非 root 用户治理 docker 容器吗,答案是能够的。

非 root 用户治理容器

创立治理 docker 容器用户
因为 docker 软件装置好之后,主动会创立好 docker 用户组,所以这里只须要创立好治理 docer 容器的用户就好。

[root@localhost ~]# useradd -g docker -d /home/appdocker  appdocker 
[root@localhost ~]# 
[root@localhost ~]# id appdocker
uid=2002(appdocker) gid=995(docker) 95(docker)

验证容器治理用户 appdocker
先来看看用 mysql 用户来执行治理 docker 命令

[mysql@localhost ~]$ docker version
Client: Docker Engine - Community
 Version:           19.03.5
 API version:       1.40
 Go version:        go1.12.12
 Git commit:        633a0ea
 Built:             Wed Nov 13 07:25:41 2019
 OS/Arch:           linux/amd64
 Experimental:      false
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/version: dial unix /var/run/docker.sock: connect: permission denied
[mysql@localhost ~]$ 
[mysql@localhost ~]$ docker ps
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/containers/json: dial unix /var/run/docker.sock: connect: permission denied
[mysql@localhost ~]$ 

能够看到用 mysql 用户执行 docker version,docker ps 都报错,无法访问 /var/run/docker.sock
这个文件的。

来看看新创建的容器治理用户(appdocker)执行状况
查看容器版本

[appdocker@localhost ~]$ docker version
Client: Docker Engine - Community
 Version:           19.03.5
 API version:       1.40
 Go version:        go1.12.12
 Git commit:        633a0ea
 Built:             Wed Nov 13 07:25:41 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.5
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.12
  Git commit:       633a0ea
  Built:            Wed Nov 13 07:24:18 2019
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.10
  GitCommit:        b34a5c8af56e510852c35414db4c1f4fa6172339
 runc:
  Version:          1.0.0-rc8+dev
  GitCommit:        3e425f80a8c931f88e6d94a8c831b9d5aa481657
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

查看正在运行的容器

[appdocker@localhost ~]$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                               NAMES
ff668e421d59        mysql:5.7.28        "docker-entrypoint.s…"   38 hours ago        Up 13 minutes       33060/tcp, 0.0.0.0:3307->3306/tcp   mysql5.7.28_3307
[appdocker@localhost ~]$ 

启停容器

[appdocker@localhost ~]$ docker stop ff668e421d59
ff668e421d59
[appdocker@localhost ~]$ 
[appdocker@localhost ~]$ docker start ff668e421d59
ff668e421d59
[appdocker@localhost ~]$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                               NAMES
ff668e421d59        mysql:5.7.28        "docker-entrypoint.s…"   39 hours ago        Up 3 seconds        33060/tcp, 0.0.0.0:3307->3306/tcp   mysql5.7.28_3307
[appdocker@localhost ~]$

能够看到曾经新创建的用户 appdocker 能够完满的治理容器了。

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