## 配置网卡转发，看值是否为1
$ sysctl -a |grep -w net.ipv4.ip_forward
net.ipv4.ip_forward = 1

## 若未配置，需要执行如下
$ cat <<EOF >  /etc/sysctl.d/docker.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward=1
EOF
$ sysctl -p /etc/sysctl.d/docker.conf

## 下载阿里源repo文件
$ sudo yum install -y yum-utils
$ sudo yum-config-manager --add-repo http://mirrors.aliyun.com/repo/Centos-7.repo
$ sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

$ sudo yum clean all && yum makecache
## yum安装
$ sudo yum install -y docker-ce docker-ce-cli 

## 设置开机自启
systemctl enable docker  
systemctl daemon-reload

## 启动docker
systemctl start docker 

## 查看docker信息
docker info
docker version

## docker-client
which docker

## docker daemon
ps aux |grep docker

$ docker volume create --name jenkins_data

$ docker run -p 8080:8080 -p 50000:50000 -v jenkins_data://var/jenkins_home jenkins/jenkins:jdk21

$ docker volume create --name nexus_data

$ docker run -d -p 8081:8081--name nexus -v nexus_data://nexus-data sonatype/nexus3

services:
    nexus:
        image: sonatype/nexus3
        platform: linux/amd64
        ports:
            - "8081:8081"
        volumes:
            - nexus_data://nexus-data
            - /etc/localtime://etc/localtime:ro

volumes:
    nexus_data: