I am doing the following to determine if Tomcat is running:

$ whoami
$ ps -ef | grep -i tomcat | grep -v grep
voops     8973     1  0 Apr22 ?        00:00:40 /usr/local/jdk1.7.0_67/bin/java -Djava.util.logging.config.file=/home/voops/apache-tomcat-7.0.57/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/home/voops/apache-tomcat-7.0.57/endorsed -classpath /home/voops/apache-tomcat-7.0.57/bin/bootstrap.jar:/home/voops/apache-tomcat-7.0.57/bin/tomcat-juli.jar -Dcatalina.base=/home/voops/apache-tomcat-7.0.57 -Dcatalina.home=/home/voops/apache-tomcat-7.0.57 -Djava.io.tmpdir=/home/voops/apache-tomcat-7.0.57/temp org.apache.catalina.startup.Bootstrap start

My reading of the above is that tomcat is running as a process owned by the currently logged-in user (voops). I then do a:

$ netstat -a | grep 8080

.. but nothing is grepped.

My server.xml file declares the following element:

<Connector port="8080" protocol="HTTP/1.1"
           redirectPort="8443" />

This is what netstat -an | grep 8080 shows:

$ netstat -an | grep 8080
tcp        0      0      *                   LISTEN
tcp        1      0         CLOSE_WAIT
tcp        1      0         CLOSE_WAIT
tcp        1      0         CLOSE_WAIT
tcp        1      0         CLOSE_WAIT         
...  5 more lines similar to the one above
  • Maybe it's not listening on port 8080? What does netstat -tap | grep -i -e tomcat -e javasay? – FloHimself Apr 23 '15 at 7:32
  • @FloHimself it is listening on 8080 as I tail -f the catalina.out file and have seen: INFO: Starting ProtocolHandler ["http-bio-8080"] – Marcus Junius Brutus Apr 23 '15 at 7:43
  • @FloHimself Also the server.xml file declares a Connector for HTTP/1.1 on port 8080. – Marcus Junius Brutus Apr 23 '15 at 7:51
  • 3
    try netstat -an to get numeric result, otherwise try netstat -a|grep http-alt – Lambert Apr 23 '15 at 7:56
  • 1
    @MarcusJuniusBrutus what does netstat show when adding the -p flag? This should show PID and name of the process listening on 8080 – FloHimself Apr 23 '15 at 9:06

In case the comments to the question were not clear enough, I am adding an answer here, along with a few Pointers not mentioned in those comments.

"Why doesn't Tomcat doesn't show up when I grep netstat's output for 8080 ?"
Short Answer :
Because Port Number 8080 is getting converted to string http_alt, which will not match the grep pattern.

Details :
From https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers , we can see that Port 8080 is Officially "HTTP alternate (http_alt)—commonly used for Web proxy and caching server, or for running a Web server as a non-root user".
Basically, netstat will show "http-alt" for Port 8080 with Default Display.

When using netstat -n, the Port numbers (like 8080 for http-alt) will be shown, & you will be able to grep it. Process ID of the listening Process will be shown when running netstat with -p.

So use netstat -pa | grep http-alt or netstat -pan | grep :8080 to see the tomcat Entry.

Alternately, use lsof -P | grep :8080 which will also show the Process ID & Process Name owning the socket which is listening on Port 8080. Here -P will prevent Port Numbers getting converted to strings (like 8080 for http-alt)

Another alternative is nmap $SERVER or namp localhost, which will show all open ports including 8080, when tomcat is running fine.

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