$ yum install docker-io
$ service docker start
#如果启动失败，提示SELinux is not supported
$ vi /etc/sysconfig/docker
#修改下面这一句
# Modify these options if you want to change the way the docker daemon runs

OPTIONS='--selinux-enabled  --log-driver=journald --signature-verification=false'
if [ -z "${DOCKER_CERT_PATH}" ]; then
    DOCKER_CERT_PATH=/etc/docker
fi

#修改为
# Modify these options if you want to change the way the docker daemon runs

OPTIONS='--selinux-enabled=false  --log-driver=journald --signature-verification=false'
if [ -z "${DOCKER_CERT_PATH}" ]; then
    DOCKER_CERT_PATH=/etc/docker
fi