CentOS7安装docker 启动不了，在工作当中遇到这个问题，当时急的不清，网上资料又不多，不过经过自己的捣鼓终于解决了
这个问题！
[root@test ~]# yum update
[root@test ~]# yum install docker
[root@test ~]# service docker start
Redirecting to /bin/systemctl start docker.service
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
[root@test ~]# systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: inactive (dead) (Result: exit-code) since 四 2016-03-10 13:01:21 CST; 7s ago
Docs: http://docs.docker.com
Process: 29939 ExecStart=/usr/bin/docker daemon $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY (code=exited, status=2)
Main PID: 29939 (code=exited, status=2)
CGroup: /system.slice/docker.service
└─29970 mkfs.ext4 -E nodiscard,lazy_itable_init=0,lazy_journal_ini...
3月 10 13:01:20 test.mayocase.com systemd[1]: Failed to start Docker Applic....
3月 10 13:01:20 test.mayocase.com systemd[1]: Unit docker.service entered f....
3月 10 13:01:20 test.mayocase.com systemd[1]: docker.service failed.
3月 10 13:01:21 test.mayocase.com systemd[1]: docker.service holdoff time o....
Hint: Some lines were ellipsized, use -l to show in full.
[root@test ~]#
使用yum install docker安装完后启动不了
[root@apptest ~]# service docker start Redirecting to /bin/systemctl start docker.service
一直停留在以上步骤
可以使用以下命令来安装，即可成功。
一个问题让我折腾了两天，试过关闭防火墙，关闭selinux，重装系统，等等网上能查到的方法都解决不了。
如果大家解决了，回复感谢下我吧。
[root@apptest ~]# yum remove docker [root@apptest ~]# yum remove docker-selinux [root@test yum.repos.d]# vi /etc/yum.repos.d/docker.repo [dockerrepo] name=Docker Repository baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/ enabled=1 gpgcheck=1 gpgkey=https://yum.dockerproject.org/gpg [root@test yum.repos.d]# yum install docker-engine
已安装:
docker-engine.x86_64 0:1.10.2-1.el7.centos
作为依赖被安装:
docker-engine-selinux.noarch 0:1.10.2-1.el7.centos
[root@apptest ~]# service docker start
Redirecting to /bin/systemctl start docker.service
[root@apptest ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
[root@test yum.repos.d]# docker version
Client:
Version: 1.10.2
API version: 1.22
Go version: go1.5.3
Git commit: c3959b1
Built: Mon Feb 22 16:16:33 2016
OS/Arch: linux/amd64
Server:
Version: 1.10.2
API version: 1.22
Go version: go1.5.3
Git commit: c3959b1
Built: Mon Feb 22 16:16:33 2016
OS/Arch: linux/amd64
[root@test yum.repos.d]#
我用这个方法木有成功，是用的下面提到的另一种：
或者使用以下方法
关于添加Docker仓库的GPG密钥失败的问题：
在添加Docker仓库的GPG密钥使用命令：curl -s https://get.docker.io/gpg | sudo apt-key add -
出现：gpg: 找不到有效的 OpenPGP 数据。提示，无法添加成功
是由于：https://get.docker.io/gpg 这个文件在你的网络环境下下载不了造成的
可以使用如下命令添加：gpg --keyserver pgpkeys.mit.edu --recv-key 9AA38DCD55BE302B
然后在运行以下命令：
[root@apptest ~]# curl -fsSL https://get.docker.com/ | sh + sh -c 'sleep 3; yum -y -q install docker-engine' 警告：/var/cache/yum/x86_64/7/docker-main-repo/packages/docker-engine-selinux-1.10.2-1.el7.centos.noarch.rpm: 头V4 RSA/SHA512 Signature, 密钥 ID 2c52609d: NOKEY docker-engine-selinux-1.10.2-1.el7.centos.noarch.rpm 的公钥尚未安装 导入 GPG key 0x2C52609D: 用户ID : "Docker Release Tool (releasedocker) <[email protected]>" 指纹 : 5811 8e89 f3a9 1289 7c07 0adb f762 2157 2c52 609d 来自 : https://yum.dockerproject.org/gpg setsebool: SELinux is disabled. + sh -c 'docker version' Client: Version: 1.10.2 API version: 1.22 Go version: go1.5.3 Git commit: c3959b1 Built: Mon Feb 22 16:16:33 2016 OS/Arch: linux/amd64 Cannot connect to the Docker daemon. Is the docker daemon running on this host? If you would like to use Docker as a non-root user, you should now consider adding your user to the "docker" group with something like: sudo usermod -aG docker your-user Remember that you will have to log out and back in for this to take effect! [root@apptest ~]# [root@apptest ~]# service docker start Redirecting to /bin/systemctl start docker.service [root@apptest ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE [root@apptest ~]#
当提示Redirecting to /bin/systemctl stop docker.service请使用下列命令 启动与停止Docker
问题汇总：
1.docker中删除images的命令是docker rmi，但有时候执行此命令并不能删除images，解决rmi id 删除不了的问题
rm Remove one or more containers 容器
rmi Remove one or more images 镜像
2.当出现Cannot connect to the Docker daemon. Is the docker daemon running on this host?
service docker start
3.当提示Redirecting to /bin/systemctl stop docker.service请使用下列命令
启动与停止Docker
不是安装的问题。
systemctl命令是系统服务管理器指令，它是 service 和 chkconfig 两个命令组合。
启动docker：systemctl start docker
停止docker：systemctl stop docker
重启docker：systemctl restart docker
查看docker状态：systemctl status docker
开机启动：systemctl enable docker
查看docker概要信息：docker info
查看docker帮助文档：docker --help