刚才在玩hbase，由于只有一台linux，只好以单机版启动，直接使用了内置的zk。所以就想着查看下2181端口是不是启动了。
[root@VM-0-13-centos ~]# lsof -i:2181
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 467 root 182u IPv6 102352468 0t0 TCP *:eforward (LISTEN)
java 467 root 201u IPv6 102352531 0t0 TCP VM-0-13-centos:33872->VM-0-13-centos:eforward (ESTABLISHED)
java 467 root 202u IPv6 102352532 0t0 TCP VM-0-13-centos:eforward->VM-0-13-centos:33872 (ESTABLISHED)
java 467 root 219u IPv6 102352594 0t0 TCP VM-0-13-centos:52676->VM-0-13-centos:eforward (ESTABLISHED)
java 467 root 220u IPv6 102352595 0t0 TCP VM-0-13-centos:eforward->VM-0-13-centos:52676 (ESTABLISHED)
java 467 root 240u IPv6 102354297 0t0 TCP VM-0-13-centos:33886->VM-0-13-centos:eforward (ESTABLISHED)
java 467 root 241u IPv6 102354298 0t0 TCP VM-0-13-centos:eforward->VM-0-13-centos:33886 (ESTABLISHED)
lsof -i:2181 很有用