I am pretty new to Docker. Can we have mutiple tomcat images deployed. Multiple war to be pushed to each tomcats webapps folder? How do we do that. by default it will /user/local/tomcat/webapps . Am i correct? Please help!!!
Yes
use a common base image and copy over only the bits that change per-app. something like
FROM user/tomcatbase
COPY . /src
RUN /src/make-war.sh
RUN cp /src/my.war /usr/local/tomcat/webapps
(don’t really know Java/Tomcat, but the general idea is the same – if you really want to get fancy build the war in one container then docker cp or use volumes to get it into another one with only runtime deps)
The problem is that building the war involves pulling dependencies. The workaround to this I’ve used is to just prepackage the war using Maven, setting the path/name to the war using a ENV variable, and then having the Tomcat container copy in the war and launch it.