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 -aCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESff668e421d59 mysql:5.7.28 "docker-entrypoint.s…" 38 hours ago Exited (137) 10 hours ago mysql5.7.28_3307423e39a1c866 mysql:5.7.28 "docker-entrypoint.s…" 38 hours ago Exited (137) 10 hours ago mysql5.7.28_330630482d5580fa mysql:5.7.28 "docker-entrypoint.s…" 7 months ago Exited (0) 46 hours ago mysql_dns_5.7.28669d7e9b8d4c phensley/docker-dns "./dockerdns --domai…" 7 months ago Exited (2) 46 hours ago dnsb4f8d09ddf11 mysql:8.0.18 "docker-entrypoint.s…" 8 months ago Exited (0) 10 days ago mysql8.0.18c8bc897479a9 mysql:5.7.28 "docker-entrypoint.s…" 8 months ago Exited (0) 45 hours ago mysql5.7.28[root@localhost ~]# [root@localhost ~]# docker start ff668e421d59ff668e421d59[root@localhost ~]# [root@localhost ~]# docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESff668e421d59 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 appdockeruid=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 versionClient: 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: falseGot 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 psGot 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 versionClient: 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: falseServer: 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 psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESff668e421d59 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 ff668e421d59ff668e421d59[appdocker@localhost ~]$ [appdocker@localhost ~]$ docker start ff668e421d59ff668e421d59[appdocker@localhost ~]$ docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESff668e421d59 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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