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docker 1.12是今年docker迄今发布的最为重要的一个版本，它大大增强了docker的内置编排机制。在一直被诟病的集群的构成方面也交出了自己的答卷。虽然增加的功能让你在使用的时候有一种在使用kubernetes的感觉，但这个世界不就是这样么，你有的我也有，我有的是原生态。闲话不说，安装。
| Linux | 版本 |
|---|---|
| CentOS | 7.2 |
设定Yum
docker缺省的Yum库使用的是main，基本上是稳定的版本。目前该版本为1.10。而在centos上安装只需要设定为experimental。将其baseurl设定为https://yum.dockerproject.org/repo/experimental/centos/7/即可。以后升到1.99估计也可以用同样的花招抢先试用吧。以下为设定方式：
cat > /etc/yum.repos.d/docker.repo <<-EOF[dockerrepo]name=Docker Repositorybaseurl=https://yum.dockerproject.org/repo/experimental/centos/7/enabled=1gpgcheck=1gpgkey=https://yum.dockerproject.org/gpgEOF
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确认旧的docker相关的组件并删除
你的机器上一定有用centos简易安装方式yum install docker安装的各种docker组件。安装1.12之前先把它们删掉吧，不然后面有可能还是会提示你删除的。
[root@host32 ~]# rpm -qa |grep dockerdocker-selinux-1.10.3-44.el7.centos.x86_64docker-common-1.10.3-44.el7.centos.x86_64docker-forward-journald-1.10.3-44.el7.centos.x86_64docker-1.10.3-44.el7.centos.x86_64[root@host32 ~]#[root@host32 ~]# yum -y remove docker-selinux-1.10.3-44.el7.centos.x86_64[root@host32 ~]# yum -y remove docker-common-1.10.3-44.el7.centos.x86_64[root@host32 ~]# yum -y remove docker-forward-journald-1.10.3-44.el7.centos.x86_64[root@host32 ~]# yum -y remove docker-1.10.3-44.el7.centos.x86_64
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安装docker-engine
安装命令：yum -y install docker-engine
[root@host32 ~]# yum install -y docker-engineLoaded plugins: fastestmirror, langpacksdockerrepo | 2.9 kB 00:00:00dockerrepo/primary_db | 49 kB 00:00:03Loading mirror speeds from cached hostfile * base: mirrors.tuna.tsinghua.edu.cn * epel: mirror.premi.st * extras: mirrors.tuna.tsinghua.edu.cn * updates: mirrors.aliyun.comResolving Dependencies--> Running transaction check---> Package docker-engine.x86_64 0:1.12.0-1.el7.centos will be installed--> Processing Dependency: docker-engine-selinux >= 1.12.0-1.el7.centos for package: docker-engine-1.12.0-1.el7.centos.x86_64--> Running transaction check---> Package docker-engine-selinux.noarch 0:1.12.0-1.el7.centos will be installed--> Finished Dependency ResolutionDependencies Resolved=================================================================================================================================================== Package Arch Version Repository Size===================================================================================================================================================Installing: docker-engine x86_64 1.12.0-1.el7.centos dockerrepo 19 MInstalling for dependencies: docker-engine-selinux noarch 1.12.0-1.el7.centos dockerrepo 28 kTransaction Summary===================================================================================================================================================Install 1 Package (+1 Dependent package)Total download size: 19 MInstalled size: 79 MDownloading packages:warning: /var/cache/yum/x86_64/7/dockerrepo/packages/docker-engine-selinux-1.12.0-1.el7.centos.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 2c52609d: NOKEYPublic key for docker-engine-selinux-1.12.0-1.el7.centos.noarch.rpm is not installed(1/2): docker-engine-selinux-1.12.0-1.el7.centos.noarch.rpm | 28 kB 00:00:02(2/2): docker-engine-1.12.0-1.el7.centos.x86_64.rpm | 19 MB 00:07:34---------------------------------------------------------------------------------------------------------------------------------------------------Total 43 kB/s | 19 MB 00:07:34Retrieving key from https://yum.dockerproject.org/gpgImporting GPG key 0x2C52609D: Userid : "Docker Release Tool (releasedocker) <[email protected]>" Fingerprint: 5811 8e89 f3a9 1289 7c07 0adb f762 2157 2c52 609d From : https://yum.dockerproject.org/gpgRunning transaction checkRunning transaction testTransaction test succeededRunning transaction Installing : docker-engine-selinux-1.12.0-1.el7.centos.noarch 1/2 Installing : docker-engine-1.12.0-1.el7.centos.x86_64 2/2 Verifying : docker-engine-selinux-1.12.0-1.el7.centos.noarch 1/2 Verifying : docker-engine-1.12.0-1.el7.centos.x86_64 2/2Installed: docker-engine.x86_64 0:1.12.0-1.el7.centosDependency Installed: docker-engine-selinux.noarch 0:1.12.0-1.el7.centosComplete![root@host32 ~]#
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设定自启动
命令：systemctl enable docker
启动docker服务
命令：systemctl start docker
确认docker版本
命令：docker info
确认server version为1.12
[root@host32 ~]# docker infoContainers: 1 Running: 0 Paused: 0 Stopped: 1Images: 3Server Version: 1.12.0Storage Driver: devicemapper Pool Name: docker-253:0-19943542-pool Pool Blocksize: 65.54 kB Base Device Size: 10.74 GB Backing Filesystem: xfs Data file: /dev/loop0 Metadata file: /dev/loop1 Data Space Used: 2.443 GB Data Space Total: 107.4 GB Data Space Available: 1.789 GB Metadata Space Used: 3.568 MB Metadata Space Total: 2.147 GB Metadata Space Available: 1.789 GB Thin Pool Minimum Free Space: 10.74 GB Udev Sync Supported: true Deferred Removal Enabled: false Deferred Deletion Enabled: false Deferred Deleted Device Count: 0 Data loop file: /var/lib/docker/devicemapper/devicemapper/data WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device. Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata Library Version: 1.02.107-RHEL7 (2015-10-14)Logging Driver: json-fileCgroup Driver: cgroupfsPlugins: Volume: local Network: bridge null host overlaySwarm: inactiveRuntimes: runcDefault Runtime: runcSecurity Options: seccompKernel Version: 3.10.0-327.el7.x86_64Operating System: CentOS Linux 7 (Core)OSType: linuxArchitecture: x86_64CPUs: 1Total Memory: 1.939 GiBName: host32ID: F5ZC:SZXG:H3MC:3UHT:N3K3:XLYQ:IC6I:ZQN5:2TPK:T7RT:AIJB:Z3IMDocker Root Dir: /var/lib/dockerDebug Mode (client): falseDebug Mode (server): falseRegistry: https://index.docker.io/v1/WARNING: bridge-nf-call-ip6tables is disabledExperimental: trueInsecure Registries: 127.0.0.0/8[root@host32 ~]#
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