一、背景

使用CentOS linux搭建Devops环境时，运行Rancher.报不支持的Docker 版本，当前运行版本为17.05.0-ce。

二、选择版本

点击红色提示，跳到支持列表页面，查看选择升级的版本。选择了最新的同时支持k8s的社区版本 18.09.x-ce，

https://rancher.com/docs/rancher/v1.6/en/hosts/#supported-docker-versions

三、升级过程

1、卸载旧版本【直接按照官方文档操作】，执行脚本。官方文档地址：https://docs.docker.com/install/linux/docker-ce/centos/

 sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

 

2、安装新版本 

执行脚本：curl https://releases.rancher.com/install-docker/18.09.sh | sh。如下是执行过程

[root@localhost ~]# curl https://releases.rancher.com/install-docker/18.09.sh | sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 15429  100 15429    0     0   3865      0  0:00:03  0:00:03 --:--:--  3864
+ '[' centos = redhat ']'
+ sh -c 'yum install -y -q yum-utils'
http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/04efe80d41ea3d94d36294f7107709d1c8f70db11e152d6ef562da344748581a-primary.sqlite.bz2: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; Connection refused"
Trying other mirror.
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
+ sh -c 'yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo'
Loaded plugins: fastestmirror
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
+ '[' stable '!=' stable ']'
+ sh -c 'yum makecache fast'
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink                                                                                                                                                                                                                                   | 9.1 kB  00:00:00     
 * base: mirrors.aliyun.com
 * epel: mirrors.yun-idc.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
base                                                                                                                                                                                                                                                   | 3.6 kB  00:00:00     
docker-ce-stable                                                                                                                                                                                                                                       | 3.5 kB  00:00:00     
dockerrepo                                                                                                                                                                                                                                             | 2.9 kB  00:00:00     
extras                                                                                                                                                                                                                                                 | 2.9 kB  00:00:00     
updates                                                                                                                                                                                                                                                | 2.9 kB  00:00:00     
(1/2): docker-ce-stable/x86_64/updateinfo                                                                                                                                                                                                              |   55 B  00:00:01     
(2/2): docker-ce-stable/x86_64/primary_db                                                                                                                                                                                                              |  37 kB  00:00:02     
Metadata Cache Created
+ sh -c 'yum install -y -q docker-ce-18.09.9'
warning: /var/cache/yum/x86_64/7/docker-ce-stable/packages/docker-ce-18.09.9-3.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY
Public key for docker-ce-18.09.9-3.el7.x86_64.rpm is not installed
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

+ '[' -d /run/systemd/system ']'
+ sh -c 'service docker start'
Redirecting to /bin/systemctl start docker.service
+ sh -c 'docker version'
Client: Docker Engine - Community
 Version:           19.03.5
 API version:       1.39 (downgraded from 1.40)
 Go version:        go1.12.12
 Git commit:        633a0ea
 Built:             Wed Nov 13 07:25:41 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.9
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.11.13
  Git commit:       039a7df
  Built:            Wed Sep  4 16:22:32 2019
  OS/Arch:          linux/amd64
  Experimental:     false

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!

WARNING: Adding a user to the "docker" group will grant the ability to run
         containers which can be used to obtain root privileges on the
         docker host.
         Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
         for more information.

3、启动Docker服务

[root@localhost ~]# systemctl restart docker

4、启动容器，查看容器运行情况。

发现有部分容器自启动了。没启动的使用docker start 容器名称启动

四、验证