Tomcat service monitoring

[prejithprasannan]

Hi,
In my server Tomcat7 and 8 versions are running. I just want to monitor both versions of tomcat are running or not. If it is not triggering any alert. What item expression is used to fulfil this task. I used {Hostnameroc.num[tomcat7].last()}=0as Trigger expression. Its not working. Please suggest a possible solution for Item and trigger expression for monitoring Tomcat process.

[Hamardaban]

Look at the processes in the system - most likely you will not see the Tomcat process. Make monitoring of the java process !

[tim.mooney]

I used

{Hostname:proc.num[tomcat7].last()}=0

as Trigger expression. Its not working.

The first argument to proc.num is the process name, the 2nd argument is the user the process is running as. If you're launching your tomcat processes via

jsvc.exec

, then you probably want something like

{hostname:proc.num[jsvc.exec,tomcat7].last()}=0

for your processes running as tomcat7 and

{hostname:proc.num[jsvc.exec,tomcat8].last()}=0

for your processes running as user tomcat8.

Just checking whether the process exists is a start, but it's very basic and won't tell you if tomcat is healthy. You probably want to look at web scenarios to check that you can actually get tomcat to output the expected pages

[tim.mooney]

Hi, I have a client that has a tomcat process that occasionally dies.

If this is running on any recent Linux system, you should consider using a systemd service script to start tomcat, rather than a traditional init script. For all of its downsides, systemd excels at the "restart this if it died" issue.

[prejithprasannan]

The first argument to proc.num is the process name, the 2nd argument is the user the process is running as. If you're launching your tomcat processes via

jsvc.exec

, then you probably want something like

{hostname:proc.num[jsvc.exec,tomcat7].last()}=0

for your processes running as tomcat7 and

{hostname:proc.num[jsvc.exec,tomcat8].last()}=0

for your processes running as user tomcat8.

Just checking whether the process exists is a start, but it's very basic and won't tell you if tomcat is healthy. You probably want to look at web scenarios to check that you can actually get tomcat to output the expected pages

This is not working.

Incorrect item key "proc.num[jsvc.exec,tomcat7]" provided for trigger expression on "hostname"

[tim.mooney]

Did you edit the trigger without changing the item? You can't use a trigger if there's not a matching item somewhere.

[prejithprasannan]

Look at the processes in the system - most likely you will not see the Tomcat process. Make monitoring of the java process !

This is possible in the sense of only one version of tomcat service is running on the server. If tomcat 7 and 8 are running on the same server we cannot identify that which tomcat version went down.