linux下进程、端口号相互查看方法

linux下通过进程名查看其占用端口：

1、先查看进程pid

ps -ef | grep 进程名

2、通过pid查看占用端口

netstat -nap | grep 进程pid

例：通过tomcat进程查看对应的端口号

#查看tomcat进程pid：
命令：

ps -ef | grep tomcat

结果：

root      3287 22225  0 13:40 pts/3    00:00:00 grep --color=auto tomcat
root     17957     1  0 Mar05 ?        02:27:28 /usr/local/jdk1.8.0_151/bin/java -Djava.util.logging.config.file=/data2/opt/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -agentlib:jdwp=transport=dt_socket,address=57031,suspend=n,server=y -Djava.endorsed.dirs=/data2/opt/tomcat/endorsed -classpath /data2/opt/tomcat/bin/bootstrap.jar:/data2/opt/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/data2/opt/tomcat -Dcatalina.home=/data2/opt/tomcat -Djava.io.tmpdir=/data2/opt/tomcat/temp org.apache.catalina.startup.Bootstrap start

#通过tomcat进程pid查看占用端口（进程pid为9836）
命令：

netstat -nap | grep 17957

结果：

tcp        0      0 0.0.0.0:57031           0.0.0.0:*               LISTEN      17957/java
tcp6       0      0 :::8009                 :::*                    LISTEN      17957/java
tcp6       0      0 :::8081                 :::*                    LISTEN      17957/java
tcp6       0      0 :::9397                 :::*                    LISTEN      17957/java
tcp6       0      0 ::1:8005                :::*                    LISTEN      17957/java
tcp6       0      0 192.168.100.100:45432   192.168.100.101:7004    ESTABLISHED 17957/java
tcp6       0      0 192.168.100.100:9397    10.10.10.10:61555       ESTABLISHED 17957/java
tcp6       0      0 192.168.100.100:9397    10.10.10.10:60203        ESTABLISHED 17957/java
tcp6       0      0 192.168.100.100:40516   192.168.100.101:7003    ESTABLISHED 17957/java
tcp6       0      0 192.168.100.100:50130   192.168.100.101:7002    ESTABLISHED 17957/java
tcp6       0      0 192.168.100.100:9397    10.102.10.10:50583         ESTABLISHED 17957/java

linux通过端口查看进程：

netstat -nap | grep 端口号

例：查看8081号端口对应的进程名

tcp        0      0 127.0.0.1:48081         0.0.0.0:*               LISTEN      5234/python
tcp        0      0 192.168.100.175:35242   192.168.100.175:8081    TIME_WAIT   -
tcp6       0      0 :::8081                 :::*                    LISTEN      17957/java

查看端口是否被占用快捷方法：

lsof -i: 端口号

PS:如果提示lsof命令不支持，需要先安装lsof  ： yum intall lsof 或者 apt -get install lsof

例：查看3306和8081号是否被占用

[root@dmdev175 home]# lsof -i:3306
[root@dmdev175 home]# lsof -i:8081
COMMAND   PID USER   FD   TYPE     DEVICE SIZE/OFF NODE NAME
java    17957 root   47u  IPv6 2574430386      0t0  TCP *:tproxy (LISTEN)