Is Tomcat running

Question

Interested to know how people usually check to see if Tomcat is running on a Unix environment    I either check that the process is running using   ps -ef   grep java ps -ef   grep logging   or i check that the port number is active  netstat -a   grep 8080   is there a better way of checking that Tomcat is running  The above seem to be to be a  hacky  way of checking that Tomcat is running

User · Answer

Are you trying to set up an alert system? For a simple "heartbeat", do a HTTP request to the Tomcat port.

For more elaborate monitoring, you can set up JMX and/or SNMP to view JVM stats. We run Nagios with the SNMP plugin (bridges to JMX) to check Tomcat memory usage and request thread pool size every 10-15 minutes.

http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html

Update (2012):

We have upgraded our systems to use "monit" to check the tomcat process. I really like it. With very little configuration it automatically verifies the service is running, and automatically restarts if it is not. (sending an email alert). It can integrate with the /etc/init.d scripts or check by process name.

User · Answer

Why grep ps  when the pid has been written to the  CATALINA PID file   I have a cron d checker script which sends out an email when tomcat is down   kill -0  cat  CATALINA PID   gt   dev null 2 gt  amp 1 if      -gt 0   then     echo  Check tomcat    mailx -s  Tomcat not running  support dom com fi   I guess you could also use wget to check the health of your tomcat  If you have a diagnostics page with user load etc  you could fetch it periodically and parse it to determine if anything is going wrong

User · Answer

I ve found Tomcat to be rather finicky in that a running process or an open port doesn t necessarily mean it s actually handling requests  I usually try to grab a known page and compare its contents with a precomputed expected value

User · Answer

Try this command   ps -ef   awk    t omcat  print  2      It will return the pid if tomcat is running

User · Answer

Create a Shell script that checks if tomcat is up or down and set a cron for sh to make it check every few minutes  and auto start tomcat if down  Sample Snippet of code below    TOMCAT PID   ps -ef   awk    t omcat  print  2    echo TOMCAT PROCESSID  TOMCAT PID  if   -z   TOMCAT PID    then     echo  TOMCAT NOT RUNNING      sudo  opt tomcat bin startup sh else    echo  TOMCAT RUNNING  fi

User · Answer

tomcat sh helps you know this easily   tomcat sh usage doc says      no argument   display the process-id of the tomcat  if it s running  otherwise do nothing   So  run command on your command prompt and check for pid     tomcat sh

User · Answer

Basically you want to test   Connectivity to your tomcat instance Gather some basic statistics Whether the unix process is running   I will evaluate first 2 options as the 3rd one has been sufficiently answered already   easiest is just to develop a webpage on your WebApp that gathers some basic metrics  and have a client that can read the results or detect connectivity issues   For doing so  you have several issues   Stand Alone client in Java Using Curl

User · Answer

You can check the status of tomcat with the following ways   ps -ef   grep tomcat     This will return the tomcat path if the tomcat is running  netstat -a   grep 8080   where 8080 is the tomcat port

User · Answer

wget url or curl url where url is a url of the tomcat server that should be available  for example  wget http   localhost 8080  Then check the exit code  if it s 0 - tomcat is up

User · Answer

try this instead and because it needs root privileges use sudo  sudo service tomcat7 status

User · Answer

If tomcat is installed locally  type the following url in a browser window       localhost 8080    This will display Tomcat home page with the following message      If you re seeing this  you ve successfully installed Tomcat  Congratulations    If tomcat is installed on a separate server  you can type      replace localhost by a valid hostname or Iess where tomcat is installed   The above applies for a standard installation wherein tomcat uses the default port 8080

User · Answer

sudo netstat -lpn  grep  8080   To check the port number    ps -aef grep tomcat   Is any tomcat is running under the server   tsssinfotech-K53U infotech   ps -aef grep tomcat      root      9586  9567  0 11 35 pts 6    00 00 00 grep --colour auto tomcat

User · Answer

On my linux system  I start Tomcat with the startup sh script  To know whether it is running or not  i use   ps -ef   grep tomcat     If the output result contains the whole path to my tomcat folder  then it is running

User · Answer

I always do   tail -f logs catalina out   When I see there   INFO  Server startup in 77037 ms   then I know the server is up

User · Answer

Since my tomcat instances are named as tomcat    For example  tomcat 8086  I use        ps aux   grep tomcat   Other method is using nc utility  nc -l 8086  port number    Or  ps aux   grep java

User · Answer

netstat -lnp   grep 8080 would probably be the best way  if you know Tomcat s listening port  If you want to be certain that is is functional  you will have to establish a connection and send an HTTP request and get a response  You can do this programatically  or using any web browser

User · Answer

Here are my two cents   I have multiple tomcat instances running on different ports for my cluster setup  I use the following command to check each processes running on different ports     sbin fuser 8080 tcp   Replace the port number as per your need   And to kill the process use -k in the above command    This is much faster than the ps -ef way or any other commands where you call a command and call another grep on top of it  Works well with multiple installations of tomcat  Or any other server that uses a port as a matter of fact running on the same server    The equivalent command on BSD operating systems is fstat

[tomcat] Is Tomcat running?

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