Attach JProfiler agent to a JVM running in a Kubernetes pod

k8s-jprofiler-attach.sh

#!/bin/bash
set -ex

usage()
{
    echo "usage: k8s-jprofiler-attach.sh pod_name"
}


k8s_jvm_pod="${1}"

if [[ -z $k8s_jvm_pod ]]; then
    echo "Pod name not defined"
    usage
    exit 1
fi

EXEC="kubectl exec $k8s_jvm_pod"
CP="kubectl cp $k8s_jvm_pod"
PORT_FORWARD="kubectl port-forward $k8s_jvm_pod"

JPROFILER_PACKAGE="jprofiler_linux_12_0_3.tar.gz"

if [[ ! -f ${JPROFILER_PACKAGE} ]]; then
 wget  https://download-gcdn.ej-technologies.com/jprofiler/jprofiler_linux_12_0_3.tar.gz -O jprofiler_linux_12_0_3.tar.gz
fi

if ! ${EXEC} -- find /root/${JPROFILER_PACKAGE} &>/dev/null; then
    echo "${JPROFILER_PACKAGE} not found on the server, copying..."
    kubectl cp "${JPROFILER_PACKAGE}" "$k8s_jvm_pod:/root/${JPROFILER_PACKAGE}"
else
    echo "${JPROFILER_PACKAGE}  already found in the server"
fi

JPROFILER_PORT=31757

K8S_JVM_PID="$(${EXEC} -- /bin/ps -ef | grep "java" | grep -v "grep" | awk '{print $2}')"

if [[ -z ${K8S_JVM_PID} ]]; then
    echo "K8S_JVM_PID not defined, pick one:"
    ${EXEC} jps 2>/dev/null
    exit 1
fi

${EXEC} -- tar -C /root -xf "/root/${JPROFILER_PACKAGE}"

${EXEC} -- /root/jprofiler12.0.3/bin/jpenable --pid=${K8S_JVM_PID} --port=${JPROFILER_PORT} --noinput --gui

${PORT_FORWARD} ${JPROFILER_PORT}