一、docker安装CentOS7
一、安装步骤
前提条件
Docker运行在CentOS7上，要求系统64位、系统内核版本为3.10以上。
Docker是一个进程，一启动就两个进程，一个服务，一个守护进程。占用资源就非常少，启动速度非常
1，root账户登录，查看内核版本如下
[root@localhost ~]# uname -a
Linux localhost.qgc 3.10.0-862.11.6.el7.x86_64 #1 SMP Tue Aug 14 21:49:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
2、卸载旧版本(如果安装过旧版本的话)
$ sudo yum remove docker docker-common docker-selinux docker-engine
3、安装需要的软件包， yum-util 提供yum-config-manager功能，另外两个是devicemapper驱动依赖的
$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2
4、加软件源
[liu@localhost ~]$ sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sudo: yum-config-manager: command not found -----（表示依赖环境没有安装）
5、可以查看所有仓库中所有docker版本，并选择特定版本安装 （可选）
$ yum list docker-ce --showduplicates | sort -r
6：设置远程仓库
$sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
执行结果：
Loaded plugins: fastestmirror, langpacks
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo
7、更新缓存
- yum makecache fast
8、安装docker
$ sudo yum install docker-ce
执行结果：
Loaded plugins: fastestmirror, langpacks
docker-ce-stable | 2.9 kB ::
docker-ce-stable/x86_64/primary_db | 4.8 kB ::
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 :17.03..ce-.el7.centos will be installed
--> Processing Dependency: docker-ce-selinux >= 17.03..ce-.el7.centos for package: docker-ce-17.03..ce-.el7.centos.x86_64
--> Processing Dependency: libcgroup for package: docker-ce-17.03..ce-.el7.centos.x86_64
--> Processing Dependency: libseccomp.so.()(64bit) for package: docker-ce-17.03..ce-.el7.centos.x86_64
--> Running transaction check
---> Package docker-ce-selinux.noarch :17.03..ce-.el7.centos will be installed
--> Processing Dependency: policycoreutils-python for package: docker-ce-selinux-17.03..ce-.el7.centos.noarch
---> Package libcgroup.x86_64 :0.41-.el7 will be installed
---> Package libseccomp.x86_64 :2.3.-.el7 will be installed
--> Running transaction check
---> Package policycoreutils-python.x86_64 :2.5-.el7_3 will be installed
--> Processing Dependency: setools-libs >= 3.3.- for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: libsemanage-python >= 2.5- for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: audit-libs-python >= 2.1.- for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: python-IPy for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: libqpol.so.(VERS_1.)(64bit) for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: libqpol.so.(VERS_1.)(64bit) for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: libapol.so.(VERS_4.)(64bit) for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: checkpolicy for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: libqpol.so.()(64bit) for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Processing Dependency: libapol.so.()(64bit) for package: policycoreutils-python-2.5-.el7_3.x86_64
--> Running transaction check
---> Package audit-libs-python.x86_64 :2.6.-.el7_3. will be installed
---> Package checkpolicy.x86_64 :2.5-.el7 will be installed
---> Package libsemanage-python.x86_64 :2.5-5.1.el7_3 will be installed
---> Package python-IPy.noarch :0.75-.el7 will be installed
---> Package setools-libs.x86_64 :3.3.-1.1.el7 will be installed
--> Finished Dependency Resolution Dependencies Resolved =====================================================================================================================
Package Arch Version Repository Size
=====================================================================================================================
Installing:
docker-ce x86_64 17.03..ce-.el7.centos docker-ce-stable M
Installing for dependencies:
audit-libs-python x86_64 2.6.-.el7_3. update k
checkpolicy x86_64 2.5-.el7 base k
docker-ce-selinux noarch 17.03..ce-.el7.centos docker-ce-stable k
libcgroup x86_64 0.41-.el7 base k
libseccomp x86_64 2.3.-.el7 base k
libsemanage-python x86_64 2.5-5.1.el7_3 update k
policycoreutils-python x86_64 2.5-.el7_3 update k
python-IPy noarch 0.75-.el7 base k
setools-libs x86_64 3.3.-1.1.el7 base k Transaction Summary
=====================================================================================================================
Install Package (+ Dependent packages) Total download size: M
Installed size: M
Is this ok [y/d/N]: y
Downloading packages:
(/): audit-libs-python-2.6.-.el7_3..x86_64.rpm | kB ::
(/): checkpolicy-2.5-.el7.x86_64.rpm | kB ::
(/): libseccomp-2.3.-.el7.x86_64.rpm | kB ::
(/): libcgroup-0.41-.el7.x86_64.rpm | kB ::
(/): policycoreutils-python-2.5-.el7_3.x86_64.rpm | kB ::
(/): setools-libs-3.3.-1.1.el7.x86_64.rpm | kB ::
(/): libsemanage-python-2.5-5.1.el7_3.x86_64.rpm | kB ::
(/): python-IPy-0.75-.el7.noarch.rpm | kB ::
warning: /var/cache/yum/x86_64//docker-ce-stable/packages/docker-ce-selinux-17.03..ce-.el7.centos.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY
Public key for docker-ce-selinux-17.03..ce-.el7.centos.noarch.rpm is not installed
(/): docker-ce-selinux-17.03..ce-.el7.centos.noarch.rpm | kB ::
(/): docker-ce-17.03..ce-.el7.centos.x86_64.rpm | MB ::
---------------------------------------------------------------------------------------------------------------------
Total MB/s | MB ::
Retrieving key from https://download.docker.com/linux/centos/gpg
Importing GPG key 0x621E9F35:
Userid : "Docker Release (CE rpm) <docker@docker.com>"
Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35
From : https://download.docker.com/linux/centos/gpg
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : libcgroup-0.41-.el7.x86_64 /
Installing : setools-libs-3.3.-1.1.el7.x86_64 /
Installing : checkpolicy-2.5-.el7.x86_64 /
Installing : libsemanage-python-2.5-5.1.el7_3.x86_64 /
Installing : audit-libs-python-2.6.-.el7_3..x86_64 /
Installing : python-IPy-0.75-.el7.noarch /
Installing : policycoreutils-python-2.5-.el7_3.x86_64 /
Installing : docker-ce-selinux-17.03..ce-.el7.centos.noarch /
setsebool: SELinux is disabled.
libsemanage.semanage_direct_install_info: Overriding docker module at lower priority with module at priority .
Installing : libseccomp-2.3.-.el7.x86_64 /
Installing : docker-ce-17.03..ce-.el7.centos.x86_64 /
Verifying : libseccomp-2.3.-.el7.x86_64 /
Verifying : python-IPy-0.75-.el7.noarch /
Verifying : audit-libs-python-2.6.-.el7_3..x86_64 /
Verifying : libsemanage-python-2.5-5.1.el7_3.x86_64 /
Verifying : docker-ce-selinux-17.03..ce-.el7.centos.noarch /
Verifying : libcgroup-0.41-.el7.x86_64 /
Verifying : policycoreutils-python-2.5-.el7_3.x86_64 /
Verifying : docker-ce-17.03..ce-.el7.centos.x86_64 /
Verifying : checkpolicy-2.5-.el7.x86_64 /
Verifying : setools-libs-3.3.-1.1.el7.x86_64 / Installed:
docker-ce.x86_64 :17.03..ce-.el7.centos Dependency Installed:
audit-libs-python.x86_64 :2.6.-.el7_3. checkpolicy.x86_64 :2.5-.el7
docker-ce-selinux.noarch :17.03..ce-.el7.centos libcgroup.x86_64 :0.41-.el7
libseccomp.x86_64 :2.3.-.el7 libsemanage-python.x86_64 :2.5-5.1.el7_3
policycoreutils-python.x86_64 :2.5-.el7_3 python-IPy.noarch :0.75-.el7
setools-libs.x86_64 :3.3.-1.1.el7 Complete!
九、启动docker并加入开机启动
$ sudo systemctl start docker
$ sudo systemctl enable docker 或者（推荐上面的）
$ sudo service docker start
service docker start #启动docker
chkconfig docker on #加入开机启动
十、验证安装是否成功(有client和service两部分表示docker安装启动都成功了)
docker version
十一、测试容器
sudo docker run hello-world #基于hello-world镜像启动一个容器，如果本地没有镜像会从公网拉取过来，这次做为测试用
sudo docker info #查看信息
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
78445dd45222: Pull complete
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7
Status: Downloaded newer image for hello-world:latest Hello from Docker!
This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps:
. The Docker client contacted the Docker daemon.
. The Docker daemon pulled the "hello-world" image from the Docker Hub.
. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal. To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/ For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
二、问题
1、因为之前已经安装过旧版本的docker，在安装的时候报错如下：
Transaction check error:
file /usr/bin/docker from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
file /usr/bin/docker-containerd from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
file /usr/bin/docker-containerd-shim from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
file /usr/bin/dockerd from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
2、卸载旧版本的包
$ sudo yum erase docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
3、再次安装docker
$ sudo yum install docker-ce
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