Wait until tomcat finishes starting up

Question

I have a script that needs to run after tomcat has finished starting up and is ready to start deploying applications. I\'m using $TOMCAT_HOME/bin/startup.sh whi

Answer 1

Depends on what you mean by finishing. What do you want to wait for?

You could, for example, have a script that hits a URL repeatedly until it gets a desirable result that would only be available once the app is properly initialized.

You could also have a context listener that writes out an "I'm ready" file that you use to signal the readiness of your application. (If you do this, be sure the file doesn't exist before starting your app container).

Answer 2

It's not hard to implement programaticaly. You can implement org.apache.catalina.LifecycleListener and then you'll have

public void lifecycleEvent(LifecycleEvent lifecycleEvent) {
            if(lifecycleEvent.getType().equals(Lifecycle.START_EVENT))
            //do what you want
            }       
}

in web.xml :

<Context path="/examples" ...>
...
<Listener className="com.mycompany.mypackage.MyListener" ... >
...
</Context>

Please notice that some things could differ between 6-9 Tomcats.

Answer 3

I needed this to test from jenkins if the tomcat from the remote server started for a system check.

until [[ `ssh -o StrictHostKeyChecking=no root@${DEPLOY_HOST} 'netstat -tulpn | grep 8005'` != "" ]] ; do echo "waiting for tomcat"; sleep 6; done

Answer 4

I have done it with the following code in jenkins pipelinescript with tomcat. Before i just call

sudo /bin/systemctl restart tomcat

And have an entry in my sudoers file for the jenkins user.

Now here is the oneliner:

until [ "$(curl -w '%{response_code}' --no-keepalive -o /dev/null --connect-timeout 1 -u USERNAME:PASSWORD http://localhost:8080/manager/text/list)" == "200" ]; do echo --- sleeping for 1 second; sleep 1; done

Better readable:

until [ "$(curl -w '%{response_code}' --no-keepalive -o /dev/null --connect-timeout 1 -u USERNAME:PASSWORD http://localhost:8080/manager/text/list)" == "200" ];
do echo --- sleeping for 1 second;
sleep 1;
done

Answer 5

There isn't an easy method. As far as startup.sh and catalina.sh are concerned, tomcat is running when they finish. Although, internally, tomcat is still initializing and starting contexts.

It would help to know if you were trying to find out if your context finished loading or if you are just wanting a general, "Tomcat is runnnig although your contexts might not be completely loaded..."

If it is the latter you could create a web app that simply has a context listener that will execute a script using Runtime. If you were handy, you could make the webapp configuable via the web.xml file to accept a parameter that points to the script to execute.

Answer 6

Are you still looking for an answer? It depends on your definition of started. If your definition of started is "Now its safe to stop" then you might want to verify if port 8005 is listening.