MySQL啟動報錯“Bind on TCP/IP port: Address already in use”

啟動報錯“Bind on TCP/IP port: Address already in use”

問題描述：
mysql啟動失敗，查看err日志

# tail -f /database/umc/data/umc.err
141106 10:37:14 [ERROR] Can't start server: Bind on TCP/IP port: Address already in use
141106 10:37:14 [ERROR] Do you already have another mysqld server running on port: 3306 ?

原因分析：
端口3306被占用

使用命令：
ps -aux | grep mysql
發現並沒有3306端口的mysql進程。

使用命令：netstat –apn 
查看所有的進程和端口使用情况。發現下面的進程列錶，其中最後一欄是PID/Program name 

# netstat -apn  | grep 3306    
tcp        0      0 ::ffff:192.168.65.211:3306  ::ffff:192.168.65.211:3306  ESTABLISHED 18148/java 

發現3306端口被PID為18148的Java進程占用。

進一步使用命令：ps -aux | grep java，或者直接：ps -aux | grep pid 查看
就可以明確知道3306端口是被哪個程序占用了！然後判斷是否使用KILL命令幹掉！
 
#啟動mysql
觀察

# netstat -anp  | grep 3306 
tcp        0      0 :::3306                     :::*                        LISTEN      16511/mysqld        
tcp        0      0 ::ffff:192.168.65.211:3306  ::ffff:192.168.65.211:4840  ESTABLISHED 16511/mysqld        
tcp        0      0 ::ffff:192.168.65.211:3306  ::ffff:192.168.65.211:4841  ESTABLISHED 16511/mysqld        
tcp        0      0 ::ffff:192.168.65.211:3306  ::ffff:192.168.65.211:4842  ESTABLISHED 16511/mysqld        
tcp        0      0 ::ffff:192.168.65.211:3306  ::ffff:192.168.65.211:4837  ESTABLISHED 16511/mysqld        
tcp        0      0 ::ffff:192.168.65.211:3306  ::ffff:192.168.65.211:4838  ESTABLISHED 16511/mysqld        
tcp        0      0 ::ffff:192.168.65.211:4837  ::ffff:192.168.65.211:3306  ESTABLISHED 17632/java          
tcp        0      0 ::ffff:192.168.65.211:4838  ::ffff:192.168.65.211:3306  ESTABLISHED 17632/java          
tcp        0      0 ::ffff:192.168.65.211:4840  ::ffff:192.168.65.211:3306  ESTABLISHED 17632/java          
tcp        0      0 ::ffff:192.168.65.211:4841  ::ffff:192.168.65.211:3306  ESTABLISHED 17632/java          
tcp        0      0 ::ffff:192.168.65.211:4842  ::ffff:192.168.65.211:3306  ESTABLISHED 17632/java