This script run java async profiler against dockerized app

profile_dockerized.sh

#!/bin/bash
set -e

function die() {
    local msg=${1:-"ERROR: die for reason unknown"}
    local code=${2:-254}

    echo "${msg}" >&2
    exit ${code}
}

export app_name=$1
export profile_events=${2:-'cpu'}
export profile_duration_seconds=${3:-'100'}

echo "==== This script launches java async profiler against application running in docker"
if [ -z "${app_name}" ]; then
    echo "ERROR: app_name not specified" >&2
    die "USAGE: $0 <app_name> [profile_events] [profile_duration_seconds]" 11
fi

if [ "`sysctl kernel.perf_event_paranoid`" != "kernel.perf_event_paranoid = 1" ]; then 
    die "ERROR: java async profiler requires
         kernel.perf_event_paranoid = 1 
    current value is: 
         `sysctl kernel.perf_event_paranoid`
    Check https://github.com/jvm-profiling-tools/async-profiler#basic-usage for details.
    " 12
fi

if [ "`sysctl kernel.kptr_restrict`" != "kernel.kptr_restrict = 0" ]; then 
    die "ERROR: java async profiler requires 
         kernel.kptr_restrict = 0 
    current value is: 
         `sysctl kernel.kptr_restrict`
    Check https://github.com/jvm-profiling-tools/async-profiler#basic-usage for details.
    " 13
fi

export version=${VERSION:-'2.8.1'}
export async_profiler_tarball_url="https://github.com/jvm-profiling-tools/async-profiler/releases/download/v${version}/async-profiler-${version}-linux-x64.tar.gz"
export workdir=${WORKDIR:-'/tmp'}

echo "==== Create workdir: $workdir"
mkdir -p ${workdir}

echo "==== Check java async profiler package"
if [ ! -d "${workdir}/async-profiler-${version}-linux-x64" ]; then
    echo "==== Download java async profiler package: ${async_profiler_tarball_url} "
    wget ${async_profiler_tarball_url} -O - | tar -xz -C ${workdir}
else
    echo "==== Java async profiler package found: ${workdir}/async-profiler-${version}-linux-x64"
fi

echo "==== Resolve ${app_name} container id"
export resolved_container_id=`docker ps | grep "${app_name}" | awk '{print $1}'`
if [ -z "${resolved_container_id}" ]; then
    die "ERROR: ${app_name} app is not running in docker" 21
fi

echo "==== Copy java async profiler into ${app_name} docker container: ${resolved_container_id}"
docker exec -i ${resolved_container_id} mkdir -p ${workdir}
docker cp ${workdir}/async-profiler-${version}-linux-x64 ${resolved_container_id}:${workdir}

echo "==== Resolve ${app_name} process id"
export resolved_pid=`docker top ${resolved_container_id} | grep com.flo.rater.RaterApplication | awk '{print $2}'`
if [ -z "${resolved_pid}" ]; then
    die "ERROR: failed to detect ${app_name} PID" 22
fi

export report_html="async_profiler_${profile_events}_`date +'%Y-%m-%d_%H-%M-%S'`.html"

echo "==== Run java async profiler against ${app_name} PID: ${resolved_pid}, report_html: ${workdir}/${report_html}"
set -x
${workdir}/async-profiler-${version}-linux-x64/profiler.sh -d ${profile_duration_seconds} -e ${profile_events} --title ${profile_events} -f ${workdir}/${report_html} ${resolved_pid}
set +x

echo "==== Fetch profiler report from ${app_name} container ${resolved_container_id}"
docker cp ${resolved_container_id}:${workdir}/${report_html} ${workdir}

ls ${workdir}/${report_html}