Docker 高版本降低指定版本及更新到最新版本

1.查看安装版本,我这安装的是最新的docker版本。如下：

yum list installed | grep docker

3.停止docker服务

[root@localhost ~]# systemctl stop docker.service

语法：yum downgrade --setopt=obsoletes=0 -y docker-ce-${version} docker-ce-selinux-${version}

注：${version}指定要降级的版本。

示例,如下（亲测有效）：

[root@localhost ~]# yum downgrade --setopt=obsoletes=0 -y docker-ce-19.03.13-3.el7 docker-ce-cli-19.03.13-3.el7 containerd.io

3.启动并查看

4.Docker更新到最新版本

【Docker】Ubuntu20.04将Docker升级至最新版 

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1	curl -fsSL https://get.docker.com/ | sh

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yang@ubuntu:~$ curl -fsSL https://get.docker.com/ | sh # Executing docker install script, commit: 93d2499759296ac1f9c510605fef85052a2c32be Warning: the "docker" command appears to already exist on this system.   If you already have Docker installed, this script can cause trouble, which is why we're displaying this warning and provide the opportunity to cancel the installation.   If you installed the current Docker package using this script and are using it again to update Docker, you can safely ignore this message.   You may press Ctrl+C now to abort this script. + sleep 20 + sudo -E sh -c apt-get update -qq >/dev/null + sudo -E sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null + sudo -E sh -c curl -fsSL "https://download.docker.com/linux/ubuntu/gpg" | gpg --dearmor --yes -o /usr/share/keyrings/docker-archive-keyring.gpg + sudo -E sh -c echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu focal stable" > /etc/apt/sources.list.d/docker.list + sudo -E sh -c apt-get update -qq >/dev/null + sudo -E sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends  docker-ce-cli docker-scan-plugin docker-ce >/dev/null + version_gte 20.10 + [ -z  ] + return 0 + sudo -E sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq docker-ce-rootless-extras >/dev/null + sudo -E sh -c docker version Client: Docker Engine - Community  Version:           20.10.11

重启并查看

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yang@ubuntu:~$ sudo systemctl restart docker yang@ubuntu:~$ docker version Client: Docker Engine - Community  Version:           20.10.11  API version:       1.41  Go version:        go1.16.9  Git commit:        dea9396  Built:             Thu Nov 18 00:37:06 2021  OS/Arch:           linux/amd64  Context:           default  Experimental:      true   Server: Docker Engine - Community  Engine:   Version:          20.10.11   API version:      1.41 (minimum version 1.12)   Go version:       go1.16.9   Git commit:       847da18   Built:            Thu Nov 18 00:35:15 2021   OS/Arch:          linux/amd64   Experimental:     false  containerd:   Version:          1.4.11   GitCommit:        5b46e404f6b9f661a205e28d59c982d3634148f8  runc:   Version:          1.0.2   GitCommit:        v1.0.2-0-g52b36a2  docker-init:   Version:          0.19.0   GitCommit:        de40ad0

　　

为什么降低版本呢？

因为更新了系统后，docker也随之更新为最新版本，在rancher添加的主机上就提示【未测试Dokcer版本】，而我之前的版本是19.03，因为添加主机的时候docker版本是19.03，升级后就显示未测试Docker 版本，如下图：

 

降低版本后：

警告自动取消！！！

所以要降低到原来的版本，说是rancher 1.6的不支持docker 20的版本，所以就先降回原来的版本！