Linux – Which application is using port 8080

Always, Java developers need to know which application is using the high demand 8080 port. In this tutorial, we will show you two ways to find out which application is using port 8080 on Linux.

1. lsof + ps command

1.1 Bring up the terminal, type lsof -i :8080

$ lsof -i :8080
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
java    10165 mkyong   52u  IPv6 191544      0t0  TCP *:http-alt (LISTEN)

1.2 PID 10165 is using port 8080, type ps -ef | grep 10165 to find out the application details.

$ ps -ef | grep 10165
mkyong   10165  4364  1 11:58 ?        00:00:20 /opt/jdk/jdk1.8.0_66/jre/bin/java 
//...
-Djava.endorsed.dirs=/home/mkyong/software/apache-tomcat-8.0.30/endorsed 
-classpath /home/mkyong/software/apache-tomcat-8.0.30/bin/bootstrap.jar:
/home/mkyong/software/apache-tomcat-8.0.30/bin/tomcat-juli.jar 
-Dcatalina.base=/home/mkyong/.IntelliJIdea15/system/tomcat/Unnamed_hc_2 
-Dcatalina.home=/home/mkyong/software/apache-tomcat-8.0.30 
-Djava.io.tmpdir=/home/mkyong/software/apache-tomcat-8.0.30
/temp org.apache.catalina.startup.Bootstrap start

Answer : IntelliJ IDEA + Tomcat 8 is using the port 8080.

2. netstat + ps command

Just different command to do the same thing.Type netstat -nlp | grep 8080 to get the PID and ps it.

$ netstat -nlp | grep 8080
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp6       0      0 :::8080                 :::*                    LISTEN      10165/java 
$ ps -ef | grep 10165
mkyong   10165  4364  1 11:58 ?        00:00:20 /opt/jdk/jdk1.8.0_66/jre/bin/java 
//...

References

1. Wikipedia : Lsof command
2. Wikipedia : ps command
3. Wikipedia : netstat command
4. Mac OSX – What program is using port 8080