构建master
        docker build -t xtradb:master .
  构建slave
        docker build -t xtradb:slave .

  docker run -d --name xtradbnode1 -p 3306:3306 daocloud.io/onatkh/xtradb-master:master-init /usr/bin/mysqld_safe
  docker run -d --name xtradbnode2 -p 13306:3306 --link xtradbnode1:node1 daocloud.io/onatkh/xtradb-slave:master-init /usr/bin/mysqld_safe

  通过mysql命定行查看是否成功
  
  mysql$:show global status like 'wsrep_cluster_size';

  master镜像：daocloud.io/onatkh/xtradb-master:master-init
        pull:docker pull daocloud.io/onatkh/xtradb-master:master-init
  镜像：daocloud.io/onatkh/xtradb-slave:master-init
        pull:docker pull daocloud.io/onatkh/xtradb-slave:master-init

  http://www.oschina.net/translate/percona-xtradb-cluster-how-to-run-a-2-node-cluster-on-a-single-server