docker下载和安装

sudo yum install -y yum-utils
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说明：centos8可能会报错，解决办法为：查看centos8切换安装源

sudo yum-config-manager 
    --add-repo 
    https://download.docker.com/linux/centos/docker-ce.repo
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# 安装docker服务端、docker客户端、容器、compose
sudo yum install docker-ce docker-ce-cli containerd.io docker-compose-plugin
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查看安装列表

yum list docker-ce --showduplicates | sort -r

sudo systemctl start docker

sudo docker run hello-world

sudo docker run tomcat