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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。
设定Yum
cat > /etc/yum.repos.d/docker.repo <<-EOF [dockerrepo] name=Docker Repository baseurl=https://yum.dockerproject.org/repo/experimental/centos/7/ enabled=1 gpgcheck=1 gpgkey=https://yum.dockerproject.org/gpg EOF 确认旧的docker相关的组件并删除
[root@host32 ~]# rpm -qa |grep docker docker-selinux-1.10.3-44.el7.centos.x86_64 docker-common-1.10.3-44.el7.centos.x86_64 docker-forward-journald-1.10.3-44.el7.centos.x86_64 docker-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 安装docker-engine
[root@host32 ~]# yum install -y docker-engine Loaded plugins: fastestmirror, langpacks dockerrepo | 2.9 kB 00:00:00 dockerrepo/primary_db | 49 kB 00:00:03 Loading mirror speeds from cached hostfile * base: mirrors.tuna.tsinghua.edu.cn * epel: mirror.premi.st * extras: mirrors.tuna.tsinghua.edu.cn * updates: mirrors.aliyun.com Resolving 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 Resolution Dependencies Resolved =================================================================================================================================================== Package Arch Version Repository Size =================================================================================================================================================== Installing: docker-engine x86_64 1.12.0-1.el7.centos dockerrepo 19 M Installing for dependencies: docker-engine-selinux noarch 1.12.0-1.el7.centos dockerrepo 28 k Transaction Summary =================================================================================================================================================== Install 1 Package (+1 Dependent package) Total download size: 19 M Installed size: 79 M Downloading 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: NOKEY Public 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 00:07:34 Retrieving key from https://yum.dockerproject.org/gpg Importing GPG key 0x2C52609D: Userid : "Docker Release Tool (releasedocker) <docker@docker.com>" Fingerprint: 5811 8e89 f3a9 1289 7c07 0adb f762 2157 2c52 609d From : https://yum.dockerproject.org/gpg Running transaction check Running transaction test Transaction test succeeded Running 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 2/2 Installed: docker-engine.x86_64 0:1.12.0-1.el7.centos Dependency Installed: docker-engine-selinux.noarch 0:1.12.0-1.el7.centos Complete! [root@host32 ~]# 设定自启动
启动docker服务
确认docker版本
[root@host32 ~]# docker info Containers: 1 Running: 0 Paused: 0 Stopped: 1 Images: 3 Server Version: 1.12.0 Storage 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-file Cgroup Driver: cgroupfs Plugins: Volume: local Network: bridge null host overlay Swarm: inactive Runtimes: runc Default Runtime: runc Security Options: seccomp Kernel Version: 3.10.0-327.el7.x86_64 Operating System: CentOS Linux 7 (Core) OSType: linux Architecture: x86_64 CPUs: 1 Total Memory: 1.939 GiB Name: host32 ID: F5ZC:SZXG:H3MC:3UHT:N3K3:XLYQ:IC6I:ZQN5:2TPK:T7RT:AIJB:Z3IM Docker Root Dir: /var/lib/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ WARNING: bridge-nf-call-ip6tables is disabled Experimental: true Insecure Registries: 127.0.0.0/8 [root@host32 ~]# 转载自：http://blog.csdn.NET/liumiaocn/article/details/52130852
或干脆直接用下面的一条命令，简单：
curl -sSL https://get.daocloud.io/docker | sh适用于Ubuntu，Debian,Centos等大部分Linux，会3小时同步一次Docker官方资源
当然还提供了安装体验版和测试版的命令，如下：
curl -sSL https://get.daocloud.io/docker-experimental | sh curl -sSL https://get.daocloud.io/docker-test | sh (责任编辑：IT) |