Comments on: How to automatically recover Tomcat from crashes http://www.vineetmanohar.com/2010/06/howto-auto-recover-tomcat-crashes/?utm_source=rss&utm_medium=rss&utm_campaign=howto-auto-recover-tomcat-crashes Java, Web 2.0 and other Tech topics Thu, 09 Feb 2012 08:01:27 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: vineet http://www.vineetmanohar.com/2010/06/howto-auto-recover-tomcat-crashes/comment-page-1/#comment-6903 vineet Tue, 29 Jun 2010 15:36:28 +0000 http://www.vineetmanohar.com/?p=1108#comment-6903 Good points, Rob. I use Tomcat in dev, test and production environments. I use this script in dev and test, but not in production - simply because my production tomcat has never crashed. I suspect the reason for more frequent crashes on is lesser memory on dev and test machines and high frequency of hot deploys. I use a version of the script which notifies me when it restarts tomcat. <code> SERVICE=/etc/init.d/tomcat STOPPED_MESSAGE="Tomcat Servlet Container is not running." if [ "`$SERVICE status`" == "$STOPPED_MESSAGE"]; then { $SERVICE start mail -s "Tomcat was down on `hostname`, restarting..." admin@email.address } fi </code> While this takes care of the symptom right away, it also alerts you so that you can investigate the root cause. Good points, Rob. I use Tomcat in dev, test and production environments. I use this script in dev and test, but not in production – simply because my production tomcat has never crashed. I suspect the reason for more frequent crashes on is lesser memory on dev and test machines and high frequency of hot deploys.

I use a version of the script which notifies me when it restarts tomcat.

SERVICE=/etc/init.d/tomcat
STOPPED_MESSAGE="Tomcat Servlet Container is not running."

if [ "`$SERVICE status`" == "$STOPPED_MESSAGE"];
then
{
$SERVICE start
mail -s "Tomcat was down on `hostname`, restarting..." admin@email.address
}
fi

While this takes care of the symptom right away, it also alerts you so that you can investigate the root cause.

]]> By: Rob Blake http://www.vineetmanohar.com/2010/06/howto-auto-recover-tomcat-crashes/comment-page-1/#comment-6896 Rob Blake Tue, 29 Jun 2010 08:30:05 +0000 http://www.vineetmanohar.com/?p=1108#comment-6896 I understand the logic of wanting to use a script like this, but I do wonder if in doing so, you end up treating the symptoms rather than addressing the cause of the problem? From a business point of view, if the technology I am using in production keeps crashing I would want to know how often this occurs, what I am doing to cause the crashes and whether these two in combination warrant me investigating the use of alternate technologies? Is this script something that you have/would use in production, or is it something you think that is useful for individual developers? What are your thoughts about how this could be integrated into a wider monitoring solution so that technical issues are not masked from the business? I understand the logic of wanting to use a script like this, but I do wonder if in doing so, you end up treating the symptoms rather than addressing the cause of the problem?

From a business point of view, if the technology I am using in production keeps crashing I would want to know how often this occurs, what I am doing to cause the crashes and whether these two in combination warrant me investigating the use of alternate technologies? Is this script something that you have/would use in production, or is it something you think that is useful for individual developers?

What are your thoughts about how this could be integrated into a wider monitoring solution so that technical issues are not masked from the business?

]]> By: Tom http://www.vineetmanohar.com/2010/06/howto-auto-recover-tomcat-crashes/comment-page-1/#comment-6885 Tom Mon, 28 Jun 2010 16:22:00 +0000 http://www.vineetmanohar.com/?p=1108#comment-6885 Thanks You can also test like this: return_string = $(jps | grep Bootstrap) if [-n "$return_string" ]; then .... Thanks

You can also test like this:

return_string = $(jps | grep Bootstrap)
if [-n "$return_string" ]; then ….

]]> By: sapporo http://www.vineetmanohar.com/2010/06/howto-auto-recover-tomcat-crashes/comment-page-1/#comment-6883 sapporo Mon, 28 Jun 2010 13:31:17 +0000 http://www.vineetmanohar.com/?p=1108#comment-6883 Instead of re-inventing the wheel, you could also use Tanuki Java Service Wrapper (open source/commercial), Yet Another Java Service Wrapper (open source), or Apache Commons Daemon (procrun on Windows or jsvc on Linux, both open source). Instead of re-inventing the wheel, you could also use Tanuki Java Service Wrapper (open source/commercial), Yet Another Java Service Wrapper (open source), or Apache Commons Daemon (procrun on Windows or jsvc on Linux, both open source).

]]> By: Ramesh http://www.vineetmanohar.com/2010/06/howto-auto-recover-tomcat-crashes/comment-page-1/#comment-6871 Ramesh Mon, 28 Jun 2010 03:29:58 +0000 http://www.vineetmanohar.com/?p=1108#comment-6871 better yet... use monit (http://mmonit.com/monit/) better yet… use monit (http://mmonit.com/monit/)

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