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S Ahmed,
On 10/15/12 11:39 AM, S Ahmed wrote:
> So when I have my server setup with tomcat, I normally do this
> first:
>
> sudo mv /var/lib/tomcat6/webapps/ROOT/
> /var/lib/tomcat6/webapps/old_ROOT
>
> I then move my .war file:
>
> sudo cp hello_world_war.war
> /var/lib/tomcat6/webapps/hello_world_war.war
If you have a large WAR file, you might want to copy it somewhere else
first, then 'mv' it. Otherwise, Tomcat might attempt to re-deploy the
WAR file before the copy is complete. Maybe:
sudo cp hello_world_war.war /var/lib/tomcat6/staging/hello_world_war.war
sudo mv /var/lib/tomcat6/webapps/hello_world_war.war \
/var/lib/tomcat6/webapps/hello_world_war.war
sudo mv /var/lib/tomcat6/staging/hello_world_war.war \
/var/lib/tomcat6/webapps/hello_world_war.war
> And everything works as expected for me.
>
> Now say locally in development I update a .jar file, and I want to
> push a hotfix to my server.
>
> What is the best way to do this? If I simply ftp the file and copy
> it to the correct folder in my expanded war, will that suffice w/o
> downtime?
There is always some measurable "downtime" here, even if it is just
that requests are queued while the webapp reloads.
I usually don't run in production with 'reloadable' enabled because a)
I don't want any surprise reloads and b) I don't want to waste any
resources checking for file updates.
If you are not enabling 'reloadable' and want to reload the context,
consider using the manager webapp to explicitly reload the context.
During the reload, Tomcat should queue all requests to the reloading
webapp and allow them to continue once the webapp has relaoded.
Just make sure that the webapp a) doesn't leak any resources when it
reloads and b) doesn't take forever to reload.
Hope that helps,
- -chris
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