zookeeper启动报错 Starting zookeeper ... already running as process 2662. --- 记录

今天忽然断电，然后重新启动zookeeper 出现了下面错误：

[root@localhost bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.13/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.


[root@localhost bin]# ./zkServer.sh start 
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.13/bin/../conf/zoo.cfg
Starting zookeeper ... already running as process 2662.

发现在 zkdata 里面有残余进程号 pid，删掉它，在重新 启动，则ok。