Kubernetes process namespacing sharing for JDK appps

process-test.yaml

# Test pod to demonstrate process namespace sharing between tomcat (using the JRE) and
# OpenJDK tools (jmap, jstack, etc.)
# See https://kubernetes.io/docs/tasks/configure-pod-container/share-process-namespace/
# Deploy using:  kubectl create -f process-test.yaml 
# Exec into the jdk container:  kubectl exec tomcat -c jdk -it bash
# Use some debug commands:  jps, jmap, jstack, etc.
apiVersion: v1
kind: Pod
metadata:
  name: tomcat
spec:
  shareProcessNamespace: true
  containers:
  - name: tomcat
    image: tomcat:9-jre11-slim
  - name: jdk
    image: openjdk:11-jdk-stretch
    securityContext:
      capabilities:
        add:
        - SYS_PTRACE
    stdin: true
    tty: true