Improve performance by running container checks in parallel
This commit is contained in:
Benjamin Renard
parent
6d4437efb6
commit
54fdabfaa7
GPG key ID:
3E2E1CE1907115BC
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@ -22,6 +22,7 @@ service nagios-nrpe-server reload
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Usage : check_container_upgrade [-d] [-E /path/to/engine] [container1,...]
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-E [path] Force a specific engine (possible values: auto docker podman, default: auto)
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-x [container] Exclude specified container (could be repeat)
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-M [integer] Max number of container checks to run in parallel (default: 4, 0=no limit)
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-d Debug mode
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-X Enable bash tracing (=set -x)
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-h Show this message
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@ -9,6 +9,8 @@
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ENGINE="auto"
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POSSIBLE_ENGINES=( "auto" "docker" "podman" )
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DEBUG=0
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MAX_PARALLEL_CHECKS=4
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ONLY_CONTAINERS=()
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EXCLUDED_CONTAINERS=( buildx_buildkit_default )
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declare -rA CHECK_PLUGINS=(
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["/usr/lib/nagios/plugins/check_apt"]="/usr/lib/nagios/plugins/check_apt -u -U -t 60 -l"
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@ -18,7 +20,7 @@ declare -rA CHECK_PLUGINS=(
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function debug() {
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if [ $DEBUG -eq 1 ]
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then
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>&2 echo -e "[DEBUG] $1"
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>&2 echo -e "[DEBUG] $@"
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fi
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}
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@ -41,9 +43,10 @@ function usage() {
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error="$1"
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[ -n "$error" ] && echo "$error"
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cat << EOF
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Usage : $0 [-d] [-E /path/to/engine] [container1,...]
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Usage : $(basename $0) [-d] [-E /path/to/engine] [container1,...]
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-E [path] Force a specific engine (possible values: ${POSSIBLE_ENGINES[@]}, default: $ENGINE)
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-x [container] Exclude specified container (could be repeat)
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-M [integer] Max number of container checks to run in parallel (default: $MAX_PARALLEL_CHECKS, 0=no limit)
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-d Debug mode
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-X Enable bash tracing (=set -x)
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-h Show this message
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@ -52,34 +55,43 @@ EOF
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exit 0
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}
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while getopts "hdXE:x:" OPTION
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idx=1
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while [ $idx -le $# ]
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do
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case $OPTION in
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d)
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OPT=${!idx}
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case $OPT in
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-d)
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DEBUG=1
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;;
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h)
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-h)
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usage
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;;
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E)
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ENGINE=$OPTARG
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-E)
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((idx++))
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ENGINE=${!idx}
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if [ ! -x "$ENGINE" ]
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then
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in_array $ENGINE $POSSIBLE_ENGINES || usage "Invalid engine $ENGINE"
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in_array $ENGINE ${POSSIBLE_ENGINES[@]} || usage "Invalid engine $ENGINE"
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fi
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;;
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x)
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EXCLUDED_CONTAINERS+=( $OPTARG )
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-x)
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((idx++))
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EXCLUDED_CONTAINERS+=( ${!idx} )
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;;
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X)
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-M)
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((idx++))
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MAX_PARALLEL_CHECKS=${!idx}
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;;
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-X)
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set -x
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;;
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*)
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usage "Unknown option $OPTION"
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*)
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ONLY_CONTAINERS+=( $OPT )
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;;
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esac
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esac
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((idx++))
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done
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ONLY_CONTAINERS=( "${@:$OPTIND}" )
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! is_empty $ONLY_CONTAINERS && debug "Only containers: ${ONLY_CONTAINERS[@]}"
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if [ "$ENGINE" == "auto" ]
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@ -106,6 +118,8 @@ then
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fi
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EXIT_CODE=0
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declare -A CONTAINER_STATUS_FILE
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declare -A CONTAINER_PID
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declare -A UPTODATE
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declare -A ERRORS
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CHECKED_CONTAINERS=( )
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@ -114,19 +128,11 @@ debug "List running containers..."
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RUNNING_CONTAINERS=$($ENGINE ps --format '{{.Names}}' | tr '\n' ' ')
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debug "Running containers: $RUNNING_CONTAINERS"
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for container in $RUNNING_CONTAINERS
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do
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if ! is_empty $ONLY_CONTAINERS && ! in_array $container $ONLY_CONTAINERS
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then
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debug "$container - Ignored"
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continue
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fi
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if in_array $container $EXCLUDED_CONTAINERS
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then
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debug "$container - Excluded"
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continue
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fi
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CHECKED_CONTAINERS+=( "$container" )
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# Implement check inside a function to allow running it in parallel
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# Parameters : [container] [output file]
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function check_container() {
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container="$1"
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output_file="$2"
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STATUS=""
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for check_plugin in ${CHECK_PLUGINS[@]}
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do
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@ -149,6 +155,44 @@ do
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STATUS="UNKNOWN - No check plugin available"
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ex=3
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fi
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echo $STATUS > $output_file
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return $ex
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}
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debug "Trigger check of all selected containers..."
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for container in $RUNNING_CONTAINERS
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do
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if ! is_empty $ONLY_CONTAINERS && ! in_array $container ${ONLY_CONTAINERS[@]}
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then
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debug "$container - Ignored"
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continue
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fi
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if in_array $container ${EXCLUDED_CONTAINERS[@]}
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then
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debug "$container - Excluded"
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continue
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fi
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if [ $MAX_PARALLEL_CHECKS -gt 0 -a "$(jobs | wc -l)" -ge $MAX_PARALLEL_CHECKS ]
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then
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debug "Max parallel checks count reached. Waiting some check ending"
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wait -n
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debug "Some check ended, continue"
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fi
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CHECKED_CONTAINERS+=( "$container" )
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CONTAINER_STATUS_FILE+=( ["$container"]=$( mktemp ) )
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check_container $container ${CONTAINER_STATUS_FILE[$container]} & CONTAINER_PID+=( ["$container"]=$! )
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done
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debug "Wait for each individual container check and handle their result..."
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for container in ${!CONTAINER_PID[@]}
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do
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pid=${CONTAINER_PID[$container]}
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debug "$container - Waiting for PID ${pid}..."
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wait $pid
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ex=$?
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debug "$container - Check return ${ex}"
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STATUS=$( cat ${CONTAINER_STATUS_FILE[$container]} )
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rm -f ${CONTAINER_STATUS_FILE[$container]}
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if [ $ex -eq 0 ]
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then
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UPTODATE+=( ["$container"]=$STATUS )
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@ -164,7 +208,7 @@ if ! is_empty $ONLY_CONTAINERS
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then
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for container in ${ONLY_CONTAINERS[@]}
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do
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if ! in_array $container $CHECKED_CONTAINERS
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if ! in_array $container ${CHECKED_CONTAINERS[@]}
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then
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debug "$container - Not found"
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ERRORS+=( ["$container"]="Not found" )
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