千万不要在centos6.5上安装Docker——docker安装失败记录

1.检查linux系统版本

执行rpm -q centos-release查看centos版本，执行uname -r 查看内核版本，系统位数：

参考文章：
Docker的安装，包括内核的升级（centos6内核太低需要升级到3.1以上）

• centos6.5内核升级

1.导入public key:
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
2.安装ELRepo:
rpm -Uvh http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm
ELRepo地址可能回变动，需打开http://elrepo.org/tiki/tiki-index.php，自行选择

3.安装 kernel-lt（lt=long-term）:
yum -y --enablerepo=elrepo-kernel install kernel-lt

出现下面提示，安装完成

4.修改系统默认启动内核， 编辑grub.conf文件：
vim /etc/grub.conf

5.重启验证内核版本是否已经更新
reboot
uname -a

2.更新yum包 :

yum update

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

yum install -y yum-utils device-mapper-persistent-data lvm2

4. 设置yum源为阿里云

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

5. 安装docker

yum install docker-ce -y

安装过程报错：Package: 3:docker-ce-19.03.6-3.el7.x86_64 (docker-ce-stable) Requires: container-selinux >= 2:2.74

---> Package docker-ce-cli.x86_64 1:19.03.6-3.el7 will be installed
---> Package libcgroup.x86_64 0:0.40.rc1-27.el6_10 will be installed
--> Finished Dependency Resolution
Error: Package: 3:docker-ce-19.03.6-3.el7.x86_64 (docker-ce-stable)
           Requires: systemd
Error: Package: 3:docker-ce-19.03.6-3.el7.x86_64 (docker-ce-stable)
           Requires: libseccomp.so.2()(64bit)
Error: Package: 3:docker-ce-19.03.6-3.el7.x86_64 (docker-ce-stable)
           Requires: libsystemd.so.0()(64bit)
Error: Package: 3:docker-ce-19.03.6-3.el7.x86_64 (docker-ce-stable)
           Requires: libseccomp >= 2.3
Error: Package: containerd.io-1.2.10-3.2.el7.x86_64 (docker-ce-stable)
           Requires: container-selinux >= 2:2.74
Error: Package: containerd.io-1.2.10-3.2.el7.x86_64 (docker-ce-stable)
           Requires: systemd
Error: Package: 3:docker-ce-19.03.6-3.el7.x86_64 (docker-ce-stable)
           Requires: libsystemd.so.0(LIBSYSTEMD_209)(64bit)
Error: Package: 3:docker-ce-19.03.6-3.el7.x86_64 (docker-ce-stable)
           Requires: container-selinux >= 2:2.74
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

经过一番搜索，应该是默认下载的docker版本太高了，这里选择一个历史版本去安装：
yum list docker-ce --showduplicates 查看docker历史版本

安装18.03.1.ce版本，仍报错
[root@promote ~]# yum install docker-ce-18.03.1.ce

关闭selinux:
https://blog.csdn.net/u012371097/article/details/83787256
vi /etc/selinux/config
将SELINUX=enforcing改为SELINUX=disabled
然后重启：reboot ，依旧不行

在https://blog.csdn.net/qq_41772936/article/details/81080284 这个帖子中发现，需要先安全epel源

安装 Fedora EPEL

[root@promote ~]#  yum -y install http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
epel-release-6-8.noarch.rpm                                                                                            |  14 kB     00:00
Examining /var/tmp/yum-root-A78x80/epel-release-6-8.noarch.rpm: epel-release-6-8.noarch
Marking /var/tmp/yum-root-A78x80/epel-release-6-8.noarch.rpm to be installed
Loading mirror speeds from cached hostfile
 * base: mirrors.njupt.edu.cn
 * elrepo: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.cn99.com
 * updates: mirrors.cn99.com
Resolving Dependencies
There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.
--> Running transaction check
---> Package epel-release.noarch 0:6-8 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================================================================================
 Package                           Arch                        Version                    Repository                                     Size
==============================================================================================================================================
Installing:
 epel-release                      noarch                      6-8                        /epel-release-6-8.noarch                       22 k

Transaction Summary
==============================================================================================================================================
Install       1 Package(s)

Total size: 22 k
Installed size: 22 k
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : epel-release-6-8.noarch                                                                                                    1/1
  Verifying  : epel-release-6-8.noarch                                                                                                    1/1

Installed:
  epel-release.noarch 0:6-8

Complete!

之后就卡在了container-selinux上面，怎么安装都提示缺少依赖组件，更换centos7.3 ，轻松安装完成！