1. # 获取主节点的 master 信息
    2. mysql> show master status;
    1. mysql> CHANGE MASTER TO MASTER_HOST='192.168.1.199',MASTER_USER='reader',\
    2. MASTER_PASSWORD='reader',MASTER_LOG_FILE='',MASTER_LOG_POS=0;
    3. mysql> start slave;
    4. mysql> show slave status\G;