The WebSphere Liberty S2I Runtime image can be used to produce a lighter weight container that does not have the maven binaries and dependencies that are not needed at runtime. Depending on the application, this can potentially save several gigabytes of space in the image.
The runtime image is produced by running s2i with the runtime-image and runtime-artifact options. The build process will first build the normal builder image and then copy the output files specified in the runtime-artifact option into the image specified by runtime-image.
The following command will build a runtime image named websphere-liberty-runtime-test. It will use ibmcom/websphere-liberty-s2i as the builder image and ibmcom/websphere-liberty-s2i-runtime as the runtime image. It will copy all applications from the dropins directory of the builder image to the dropins directory of the runtime image.
$ s2i build https://github.com/WASdev/sample.ferret.git ibmcom/websphere-liberty-s2i:latest websphere-liberty-runtime-test --runtime-image ibmcom/websphere-liberty-s2i-runtime:latest --runtime-artifact /opt/ibm/wlp/usr/servers/defaultServer/dropins
$ docker run -p 9080:9080 websphere-liberty-runtime-test
Current valid arguments for the runtime-artifact option include:
/opt/ibm/wlp/usr-- Will copy the entireusrdirectory from the server in the builder image. Use this option if your builder image contains supporting libraries or other files underneath theusrdirectory./opt/ibm/wlp/usr/server/defaultServer/dropins-- Will copy all files from the dropins directory of the builder image to the dropins directory of the runtime image/opt/ibm/wlp/usr/servers/defaultServer/apps-- Will copy all files from the apps directory of the builder image to the apps directory of the runtime image/opt/ibm/wlp/usr/servers/defaultServer/server.xml-- Will copy server.xml from the builder image to the runtime image
Note that s2i does not support wildcards in this option.