Currently, we are building Docker images with an entrypoint and passing this image to a Kubernetes deployment.
Is there any way to pass the entrypoint directly to Kubernetes dynamically so that it starts spring boot applications?
What are the different ways of passing this entrypoint directly in Kubernetes?
### Runtime image ###
FROM openjdk:8-jre-alpine
#Set working dir
WORKDIR /test
# Copy the executable JAR
COPY /*.jar /test/
# Run the app
ENTRYPOINT java -Djava.security.egd=file:/dev/./urandom -Djsversion=1.0 -D<variable>=<service-1> -D<variable>=<service-2> -jar *.jarYou can set them as env variables in your pod's config
env:
- name: MY_POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: profile
value: "dev"then use them in Dockerfile's like so
CMD ["sh", "-c", "java -jar -Dspring.profiles.active=$profile rest.war"]You could also include it in your kubernetes deployment yaml file alongside the rest of your environment variables that you wish to pass into your docker container:
- name: JAVA_OPTS
value: >-
-Djava.security.egd=file:/dev/./urandom
-Djsversion=1.0 -D<variable>=<service-1> -D<variable>=<service-2>
- name: SERVER_PORT
value: 8080You can use command in k8s deployment manifest:
containers:
- name: mycontainer
env:
- name: NAME
value: VALUE
command: [ "java"]
args: ["-jar", "-D..."]