svc.yml

name: {{FRAMEWORK_NAME}}
scheduler:
  principal: {{FRAMEWORK_PRINCIPAL}}
  user: {{FRAMEWORK_USER}}
pods:
  hello:
    count: {{HELLO_COUNT}}
    placement: '{{{HELLO_PLACEMENT}}}'
    rlimits:
      RLIMIT_NOFILE:
        soft: {{HELLO_RLIMIT_NOFILE_SOFT}}
        hard: {{HELLO_RLIMIT_NOFILE_HARD}}
    tasks:
      server:
        goal: RUNNING
        cmd: env && echo hello >> hello-container-path/output && sleep $SLEEP_DURATION
        cpus: {{HELLO_CPUS}}
        memory: {{HELLO_MEM}}
        volume:
          path: hello-container-path
          type: ROOT
          size: {{HELLO_DISK}}
        env:
          SLEEP_DURATION: {{SLEEP_DURATION}}
        health-check:
          cmd: stat hello-container-path/output
          interval: 5
          grace-period: 30
          delay: 0
          timeout: 10
          max-consecutive-failures: 3
        labels: {{HELLO_LABELS}}
  world:
    count: {{WORLD_COUNT}}
    allow-decommission: true
    placement: '{{{WORLD_PLACEMENT}}}'
    rlimits:
      RLIMIT_NOFILE:
        soft: {{WORLD_RLIMIT_NOFILE_SOFT}}
        hard: {{WORLD_RLIMIT_NOFILE_HARD}}
    tasks:
      server:
        goal: RUNNING
        cmd: |
               # for graceful shutdown
               #  trap SIGTERM and mock a cleanup timeframe
               terminated () {
                 echo "$(date) received SIGTERM, zzz for 3 ..."
                 sleep 3
                 echo "$(date) ... all clean, peace out"
                 exit 0
               }
               trap terminated SIGTERM
               echo "$(date) trapping SIGTERM, watch here for the signal..."

               echo 'world1' >>world-container-path1/output &&
               echo 'world2' >>world-container-path2/output &&
               # instead of running for a short duration (equal to SLEEP_DURATION), run infinitely
               # to allow for testing of SIGTERM..grace..SIGKILL
               while true; do
                 sleep 0.1
               done
        cpus: {{WORLD_CPUS}}
        memory: {{WORLD_MEM}}
        volumes:
          vol1:
            path: world-container-path1
            type: ROOT
            size: {{WORLD_DISK}}
          vol2:
            path: world-container-path2
            type: ROOT
            size: {{WORLD_DISK}}
        env:
          SLEEP_DURATION: {{SLEEP_DURATION}}
        readiness-check:
          # wordcount (wc) will report an error if the file does not exist, which effectively is zero (0) bytes
          # so send the error to /dev/null, BUT also zero-left-pad the variable BYTES to ensure that it is zero
          # on empty for comparison sake.
          cmd: BYTES="$(wc -c world-container-path2/output 2>/dev/null| awk '{print $1;}')" && [ 0$BYTES -gt 0 ]
          interval: {{WORLD_READINESS_CHECK_INTERVAL}}
          delay: {{WORLD_READINESS_CHECK_DELAY}}
          timeout: {{WORLD_READINESS_CHECK_TIMEOUT}}
        kill-grace-period: {{WORLD_KILL_GRACE_PERIOD}}