centos安装docker
sudo yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
添加阿里云源
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
如果yum-config-manager: command not found 执行：
yum -y install yum-utils
列出列表：
yum list docker –showduplicates |sort -r yum -v list docker-ce –show-duplicates 安装18.06版本
sudo yum install -y docker-ce-18.06.1.ce-3.el7
systemctl enable docker
systemctl start docker
docker 设置代理
10.在为docker设置代理，完成后， 测试命令：docker pull k8s.gcr.io/kube-proxy:v1.12.2 10.1
mkdir -p /etc/systemd/system/docker.service.d
10.2
vi /etc/systemd/system/docker.service.d/http-proxy.conf
[Service]
Environment="HTTP_PROXY=http://10.0.20.44:1081/"
Environment="HTTPS_PROXY=http://10.0.20.44:1081/"
Environment="NO_PROXY=localhost,127.0.0.1,5aw91zix.mirror.aliyuncs.com,docker.io,registry.cn-hangzhou.aliyuncs.com,reg.cecii.cn"
sudo systemctl daemon-reload
sudo systemctl restart docker
systemctl show --property=Environment docker