JVM options · containers · Zulip Chat Archive

@Leo Andreev just stopped by and asked about something he observed that I can't easily answer. He used the Payara admin GUI to set some JVM options. He stopped the container and started it again. The JVM options were preserved. But where are they stored?

Philip Durbin 🚀 (Feb 09 2024 at 15:31):

We both agree there's no domain.xml in the data directory (data rather than docker-dev-volumes for the demo tutorial). And in the past when I exec into the dataverse container, I haven't been able to find domain.xml.

Oliver Bertuch (Feb 09 2024 at 15:37):

You're looking for ${DOMAIN_DIR}/config/domain.xml

Oliver Bertuch (Feb 09 2024 at 15:38):

Changes to that file will be written into the overlayfs, which is usually sth you want to avoid

Philip Durbin 🚀 (Feb 09 2024 at 15:42):

Hmm, I think I've heard of this overlayfs...

Philip Durbin 🚀 (Feb 09 2024 at 15:48):

Is https://jvns.ca/images/overlay.jpeg more or less accurate?

Oliver Bertuch (Feb 09 2024 at 16:03):

Yeah that describes the concept well

Oliver Bertuch (Feb 09 2024 at 16:04):

Please note this kind of writing into a container is a _very_ bad idea when on K8s. (I can elaborate if necessary)

Philip Durbin 🚀 (Feb 09 2024 at 16:06):

Ok. Thanks!

Philip Durbin 🚀 (Feb 09 2024 at 16:07):

Also, I found domain.xml, with your help:

$ docker exec -it dataverse-1 bash
payara@dataverse:~$
payara@dataverse:~$ echo $DOMAIN_DIR
/opt/payara/appserver/glassfish/domains/domain1
payara@dataverse:~$
payara@dataverse:~$ ls -l $DOMAIN_DIR/config/domain.xml
-rw-r--r-- 1 payara payara 44474 Feb  9 16:03 /opt/payara/appserver/glassfish/domains/domain1/config/domain.xml
payara@dataverse:~$