比如要查询2181端口。
1、查询端口占用的进程ID
netstat -anp | grep 2181
tcp6 0 0 :::2181 :::* LISTEN 10997/java
2181为端口号
10997为PID
还可以使用：
lsof -i:2181
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME java 10997 jim 25u IPv6 197822 0t0 TCP *:2181 (LISTEN)
2、根据PID查询所在进程位置
ps -ef | grep 10997
jim 10997 1959 0 12月14 pts/2 00:00:00 /usr/lib/jvm/java-8-oracle/bin/java -Dzookeeper.log.dir=. -Dzookeeper.root.logger=INFO,CONSOLE -cp /home/jim/opt/zookeeper-3.4.9/bin/../build/classes:/home/jim/opt/zookeeper-3.4.9/bin/../build/lib/*.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/slf4j-api-1.6.1.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/netty-3.10.5.Final.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/log4j-1.2.16.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/jline-0.9.94.jar:/home/jim/opt/zookeeper-3.4.9/bin/../zookeeper-3.4.9.jar:/home/jim/opt/zookeeper-3.4.9/bin/../src/java/lib/*.jar:/home/jim/opt/zookeeper-3.4.9/bin/../conf: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.local.only=false org.apache.zookeeper.server.quorum.QuorumPeerMain /home/jim/opt/zookeeper-3.4.9/bin/../conf/zoo.cfg
参考：
http://blog.csdn.net/rocklee/article/details/50886739
http://blog.csdn.net/zhongweijian/article/details/7942611
