服务器上yum源的存放地址： cd /etc/yum.repos.d/percona-release.repo 镜像的配置在：percona-release.repo里
/etc/docker/daemon.json存放的文件
查看docker的日志：
vi /var/log/messages
拉去一个基础镜像，然后在基础镜像上，重建镜像
docker pull registry.xxxx.com/library/base-java9:latest
docker tag registry.xxxx.com/library/base-java9:latest registry.xxxx.com/diccer/base-java9:latest
docker push registry.xxxx.com/diccer/base-java9:latest
registry.xxxx.com/diccer/base-java9:latest
docker push registry.xxxx.com/diccer/base-java9:latest
docker login registry.xxxx.com
用户名：admin
密码：xxxx
docker push registry.xxxx.com/diccer/base-java9:latest
查看keepalived的状态
more /tmp/keepalived.state
ansible all -i hosts -m shell -a ‘echo hello’
应用的取值
ansible all -i hosts -m shell -a “ps -ef|grep java|grep -v Xmx|grep jar|cut -d ‘=’ -f 14|grep home”