Swarm mode - Find NanoCPUs Reserved from a cluster or a single node

cluster_cpureservation.sh

#!/bin/bash

# uses some poor techniques like awk + grep so it works on 17.03 and newer where formatting isn't available

# get a list of all of the nodes; loop through them
for NODE in $(docker node ls -q)
do
  # reset the per node CPU resevation counter to 0
  CPURES="0"

  # find each task on a given node and loop through them
  for TASK in $(docker node ps -f desired-state=running "${NODE}" | awk '{print $1}' | grep -v ^ID)
  do
    # find out the NanoCPUs
    NANOCPUS="$(docker inspect --format '{{.Spec.Resources.Reservations.NanoCPUs}}' "${TASK}" 2>/dev/null || echo 0)"

    # total the NanoCPUs from this task to the rest
    CPURES="$((CPURES + NANOCPUS))"
  done

  # check to see if bc exists; use it if it does; fall back to just reporting NanoCPUs otherwise
  if hash bc 2>/dev/null; then
    # output # CPUs reserved
    echo -n "${NODE} CPUs reserved: "
    bc -l <<< "scale=2;${CPURES} / 1000000000"
  else
    # output # NanoCPUs reserved
    echo "${NODE} NanoCPUs reserved: ${CPURES}"
  fi
done

node_cpureservation.sh

#!/bin/bash

# Finds NanoCPUs reserved for a single node in the cluster

NODE="demo02" ;\
CPURES="0" ;\
echo "" ;\
docker node ps -f desired-state=running ${NODE} ;\
for TASK in $(docker node ps -f desired-state=running ${NODE} | awk '{print $1}' | grep -v ^ID); do
  echo "${TASK}"
  NANOCPUS="$(docker inspect --format '{{.Spec.Resources.Reservations.NanoCPUs}}' ${TASK} 2>/dev/null || echo 0)"
  CPURES="$(echo $((CPURES + NANOCPUS)))"
  echo ${NANOCPUS}
  echo ""
done ;\
if hash bc 2>/dev/null; then
  echo -n "CPUs: "
  bc -l <<< "scale=2;${CPURES} / 1000000000"
else
  echo "NanoCPUs: ${CPURES}"
  echo "  (Divide by 1000000000 to get CPUs)"
fi

test_service.sh

#!/bin/bash

docker service create --name cputest --reserve-cpu .5 --limit-cpu .5 --reserve-memory 128M --limit-memory 128M alpine:latest ping 127.0.0.1