- netstat -anp |grep 端口号
如下，我以3306为例，netstat -anp |grep 3306（此处备注下，如果我是以普通用户操作，则需要加上sudo，如果是以root用户操作，不用加sudo即可查看）
root@hadoop-master lib# netstat -anp |grep 3306
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2953/mysqld
tcp 0 0 127.0.0.1:32994 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 10.27.92.164:3306 10.26.94.145:36248 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:3306 127.0.0.1:33242 ESTABLISHED 2953/mysqld
tcp 0 0 10.27.92.164:3306 10.26.94.145:36246 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:3306 127.0.0.1:33002 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:3306 127.0.0.1:33003 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:33012 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:3306 127.0.0.1:32998 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:33010 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33238 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33242 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33240 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33000 127.0.0.1:3306 ESTABLISHED 9591/java
主要看监控状态为LISTEN表示已经被占用，最后一列显示被服务mysqld占用，查看具体端口号，只要有如图这一行就表示被占用了
- netstat -nultp
该命令是查看当前所有已经使用的端口情况
root@hadoop-master lib# netstat -nultp |grep 3306
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2953/mysqld
- netstat -anp |grep 端口号
root@hadoop-master lib# netstat -anp |grep 3306
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2953/mysqld
tcp 0 0 127.0.0.1:32994 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 10.27.92.164:3306 10.26.94.145:36248 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:3306 127.0.0.1:33242 ESTABLISHED 2953/mysqld
tcp 0 0 10.27.92.164:3306 10.26.94.145:36246 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:3306 127.0.0.1:33002 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:3306 127.0.0.1:33003 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:33012 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:3306 127.0.0.1:32998 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:33010 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33238 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33242 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33240 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33000 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 10.27.92.164:3306 10.26.94.145:36254 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:3306 127.0.0.1:33010 ESTABLISHED 2953/mysqld
tcp 0 0 127.0.0.1:32998 127.0.0.1:3306 ESTABLISHED 9591/java
tcp 0 0 127.0.0.1:33003 127.0.0.1:3306 ESTABLISHED 9591/java
杀死进程：kill -9 pid
