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

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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

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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

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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

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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

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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

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

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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

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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

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

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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

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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

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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

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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

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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

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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

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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

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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

[tomcat] Is Tomcat running?

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