MySQL "Bind on TCP/IP port: Address already in use"

MySQL "Bind on TCP/IP port: Address already in use"

Recently, a MySQL instance has been added to the server where MySQL Enterprise Monitor has been deployed. As a result, the MySQL Enterprise Monitor Instance becomes abnormal and cannot be restarted successfully. The error message "Bind on TCP/IP port: Address already in use" is received. The following is a solution to this problem for your reference.

1. Fault
[Root @ SZAPP03 init. d] #./mysql-monitor-server start
Starting mysql service [OK]
150127 09:57:34 mysqld_safe Logging to '/opt/mysql/enterprise/monitor/mysql/runtime/mysqld. log '.
150127 09:57:35 mysqld_safe Starting mysqld daemon with databases from/opt/mysql/enterprise/monitor/mysql/data/
./Mysql-monitor-server: tomcat (pid 28303) already running
150127 09:57:42 mysqld_safe mysqld from pid file/opt/mysql/enterprise/monitor/mysql/runtime/mysqld. pid ended

2. Fault Analysis
# Check the log. The prompt is Bind on TCP/IP port: Address already in use. The Address is in use, as shown below:
[Root @ SZAPP03 init. d] # tail-100/opt/mysql/enterprise/monitor/mysql/runtime/mysqld. log | grep "ERROR"-A5
09:57:36 30753 [ERROR] Can't start server: Bind on TCP/IP port: Address already in use
2015-01-27 09:57:36 30753 [ERROR] Do you already have another mysqld server running on port: 13306?
09:57:36 30753 [ERROR] Aborting

09:57:36 30753 [Note] Binlog end
09:57:36 30753 [Note] Shutting down plugin 'partition'
09:57:36 30753 [Note] Shutting down plugin 'archive'
09:57:36 30753 [Note] Shutting down plugin 'blackhole'
09:57:36 30753 [Note] Shutting down plugin 'archive'
09:57:36 30753 [Note] Shutting down plugin 'blackhole'

# Check the default mysql enterprise monitor port number 13306 based on the preceding error message.
[Root @ SZAPP03 init. d] # netstat-nltp | grep mysql
Tcp 0 0: 3306: * LISTEN 8734/mysqld
Tcp 0 0: 3307: * LISTEN 9489/mysqld

3. troubleshooting

# The error message is tomcat (pid 28303) already running.
# This caused my attention, so I tried to kill tomcat-related processes first.
[Root @ SZAPP03 init. d] # ps-ef | grep 28303 | grep-v grep
Mysqlmem 28303 28302 4 Jan20? 07:35:03 jsvc.exe c-java-home/opt/mysql/enterprise/monitor/java
-User mysqlmem-pidfile/opt/mysql/enterprise/monitor/apache-tomcat/temp/catalina. pid-wait 10-outfile
/Opt/mysql/enterprise/monitor/apache-tomcat/logs/catalina-daemon.out-errfile & 1-classpath
/Opt/mysql/enterprise/monitor/apache-tomcat/bin/bootstrap. jar:
/Opt/mysql/enterprise/monitor/apache-tomcat/bin/commons-daemon.jar:
/Opt/mysql/enterprise/monitor/apache-tomcat/bin/tomcat-juli.jar-Dnop-Xmx768M-Xms768M
-XX: + HeapDumpOnOutOfMemoryError-XX: HeapDumpPath =/opt/mysql/enterprise/monitor/apache-tomcat/temp
-XX: + UseParallelOldGC-XX: MaxPermSize = 512 M-Djava. util. logging. manager = org. apache. juli. ClassLoaderLogManager
-Djava. endorsed. dirs =-Dcatalina. base =/opt/mysql/enterprise/monitor/apache-tomcat
-Dcatalina. home =/opt/mysql/enterprise/monitor/apache-tomcat
-Djava. io. tmpdir =/opt/mysql/enterprise/monitor/apache-tomcat/temp org. apache. catalina. startup. Bootstrap

[Root @ SZAPP03 init. d] # kill-9 28303
# Check whether any tomcat-related process exists again and kill tomcat-related processes one by one
[Root @ SZAPP03 init. d] # ps-ef | grep tomcat
[Root @ SZAPP03 init. d] # kill-9 28302
[Root @ SZAPP03 init. d] # kill-9 30867
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