首先，我们要移除旧版本docker:
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$ sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine |
然后就是安装新版本：
准备工作必要工具：
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$ sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2 |
设置repo:
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$ sudo yum-config-manager \ --add-repo \ https://download.docker.com/linux/centos/docker-ce.repo |
安装：
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$ sudo yum install docker-ce docker-ce-cli containerd.io |
启动：
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$ sudo systemctl start docker |
验证：
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$ sudo docker run hello-world |
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