二,安装Docker
2.1--检测安装的前提条件
1.内核
确认服务器安装了3.8或者更高的内核版本。
1 [root@ecs-d68e-0003 data]# uname -a 2 Linux ecs-d68e-0003.novalocal 3.10.0-693.11.1.el7.x86_64 #1 SMP Mon Dec 4 23:52:40 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
2.检查 Device Mapper
Device Mapper作为docker的存储驱动,为docker提供存储能力,确认是否安装。
[root@ecs-d68e-0003 ~]# ls -l /sys/class/misc/device-mapper lrwxrwxrwx 1 root root 0 Jun 15 17:10 /sys/class/misc/device-mapper -> ../../devices/virtual/misc/device-mapper
如果你的没有检测到,需要安装device-mapper
yum install -y device-mapper
还需要加载dm_mod模块
modprobe dm_mod
2.2--安装Docker
[root@ecs-d68e-0003 ~]# yum install -y docker-io ...... ...... Installed: docker.x86_64 2:1.13.1-63.git94f4240.el7.centos Dependency Installed: docker-client.x86_64 2:1.13.1-63.git94f4240.el7.centos docker-common.x86_64 2:1.13.1-63.git94f4240.el7.centos Complete!
安装完成
2.3--docker的守护进程
1.启动
[root@ecs-d68e-0003 ~]# systemctl start docker
2.添加docker的守护进程为开机启动项
[root@ecs-d68e-0003 ~]# systemctl enable docker Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
3.检测Docker是否正确安装
[root@ecs-d68e-0003 ~]# docker info Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 0 Server Version: 1.13.1 Storage Driver: overlay2 Backing Filesystem: extfs Supports d_type: true Native Overlay Diff: true Logging Driver: journald Cgroup Driver: systemd Plugins: Volume: local Network: bridge host macvlan null overlay Swarm: inactive Runtimes: docker-runc runc Default Runtime: docker-runc Init Binary: /usr/libexec/docker/docker-init-current containerd version: (expected: aa8187dbd3b7ad67d8e5e3a15115d3eef43a7ed1) runc version: e9c345b3f906d5dc5e8100b05ce37073a811c74a (expected: 9df8b306d01f59d3a8029be411de015b7304dd8f) init version: 5b117de7f824f3d3825737cf09581645abbe35d4 (expected: 949e6facb77383876aeff8a6944dde66b3089574) Security Options: seccomp WARNING: You're not using the default seccomp profile Profile: /etc/docker/seccomp.json Kernel Version: 3.10.0-693.11.1.el7.x86_64 Operating System: CentOS Linux 7 (Core) OSType: linux Architecture: x86_64 Number of Docker Hooks: 3 CPUs: 4 Total Memory: 7.639 GiB Name: ecs-d68e-0003.novalocal ID: 2UIG:WL75:4G6D:2VFS:YL7I:2OLN:O6IU:TTZQ:DBY2:F5VW:QOJQ:QJFS Docker Root Dir: /var/lib/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ Experimental: false Insecure Registries: 127.0.0.0/8 Live Restore Enabled: false Registries: docker.io (secure)
4.检测Docker的守护进程是不是正常运行,Docker是以root权限运行它的守护进程的,来处理普通用户无法完成的操作(如挂载文件系统)。dcoker程序 Docker守护进程的客户端程序,同样也需要以root身份运行。用户可以使用docker命令控制Dokcer守护进程。
当Docker的守护进程启动时,守护进程监听/var/run/docker.sock这个套接字文件,来获取来自客户端的Docker请求。
[root@ecs-d68e-0003 ~]# service docker status Redirecting to /bin/systemctl status docker.service ● docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled) Active: active (running) since Fri 2018-06-15 17:18:09 CST; 22min ago Docs: http://docs.docker.com Main PID: 29827 (dockerd-current)
5.查看守护进程的状态
[root@ecs-d68e-0003 ~]# service docker status Redirecting to /bin/systemctl status docker.service ● docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled) Active: active (running) since Fri 2018-06-15 17:18:09 CST; 22min ago Docs: http://docs.docker.com Main PID: 29827 (dockerd-current)
6.启动和停止
service docker start --启动 service docker stop --停止
三、卸载docker
查看docker 安装条目
[root@ecs-d68e-0003 data]# yum list installed|grep docker docker.x86_64 2:1.13.1-63.git94f4240.el7.centos @extras docker-client.x86_64 2:1.13.1-63.git94f4240.el7.centos @extras docker-common.x86_64 2:1.13.1-63.git94f4240.el7.centos @extras
逐条卸载
[root@ecs-d68e-0003 data]# yum -y remove docker.x86_64
[root@ecs-d68e-0003 data]# yum -y remove docker-client.x86_64
[root@ecs-d68e-0003 data]# yum -y remove docker-common.x86_64
再次查看安装条目,删除docker镜像
[root@ecs-d68e-0003 data]# yum list installed|grep docker [root@ecs-d68e-0003 data]# rm -rf /var/lib/docker
四、容器的运行
1.运行第一个容器
[root@ecs-d68e-0003 ~]# docker run -i -t centos /bin/bash Unable to find image 'centos:latest' locally Trying to pull repository docker.io/library/centos ... latest: Pulling from docker.io/library/centos 7dc0dca2b151: Pull complete Digest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322 Status: Downloaded newer image for docker.io/centos:latest [root@92ba035b0a41 /]
解释说明:
告诉Docker执行docker run 命令,并制定了-i 和 -t 参数。
-i参数保证容器中的STDIN(标准输入)是开启的。
-t参数告诉Docker为要创建的容器分配一个伪tty终端。
这样创建的容器才能提供一个交互式的shell。若要创建一个我们能与之交互的容器,而不是一个运行后台服务的容器,则这两个参数已经是最基本的参数了。