Host memory over-commit (placement service)

memory-resource-check.sh

#!/bin/bash

function get_resource_usage {
    local UUID="$1"
    local IFS=$'\n'
    declare -Ag RESOURCE_USAGE
    for i in $(openstack resource provider usage show "$UUID" -f value); do
        CLASS=$(echo "$i" | awk '{ print $1 }')
        USAGE=$(echo "$i" | awk '{ print $2 }')
        RESOURCE_USAGE[${CLASS}]="${USAGE}"
    done
}

function get_resource_inventory {
    local UUID="$1"
    local IFS=$'\n'
    declare -Ag RESOURCE_INVENTORY
    for i in $(openstack resource provider inventory list "$UUID" -f value); do
        CLASS=$(echo "$i" | awk '{ print $1 }')
        TOTAL=$(echo "$i" | awk '{ print $7 }')
        RESERVED=$(echo "$i" | awk '{ print $5 }')
        RESOURCE_INVENTORY["${CLASS}_TOTAL"]="${TOTAL}"
        RESOURCE_INVENTORY["${CLASS}_RESERVED"]="${RESERVED}"
    done

}

function report_usage {
    local UUID="$1"
    local HOST="$2"

    if [[ ${RESOURCE_USAGE["MEMORY_MB"]} -gt $((RESOURCE_INVENTORY["MEMORY_MB_TOTAL"] - RESOURCE_INVENTORY["MEMORY_MB_RESERVED"])) ]]; then
        OVERCOMMIT_MB=$(( (RESOURCE_INVENTORY["MEMORY_MB_TOTAL"] - RESOURCE_INVENTORY["MEMORY_MB_RESERVED"] - RESOURCE_USAGE["MEMORY_MB"]) * -1 ))
        echo "$HOST: Over-committed by ${OVERCOMMIT_MB}MB. Total memory: ${RESOURCE_INVENTORY[MEMORY_MB_TOTAL]}MB Reserved: ${RESOURCE_INVENTORY[MEMORY_MB_RESERVED]}MB Used: ${RESOURCE_USAGE[MEMORY_MB]}MB"
    else
        echo "$HOST: No over-commit"
    fi
}

_IFS="$IFS"
IFS=$'\n'
for i in $(openstack resource provider list -f value); do
    UUID=$(echo "${i}" | awk '{ print $1 }')
    HOST=$(echo "${i}" | awk '{ print $2 }')
    get_resource_usage "$UUID"
    get_resource_inventory "$UUID"
    report_usage "$UUID" "$HOST"
done
IFS="$_IFS"