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README.md
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40
README.md
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# Check container upgrade
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Monitoring plugin to check if containers are upgradable. By default all running container are checked.
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Check are done by running Icinga/Nagios compatible check plugin inside containers.
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## Installation
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```
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git clone https://gitea.zionetrix.net/bn8/check_container_upgrade.git /usr/local/src/check_container_upgrade
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mkdir -p /usr/local/lib/nagios/plugins
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ln -s /usr/local/src/check_slapd_schema/check_container_upgrade /usr/local/lib/nagios/plugins/
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echo "nagios ALL=NOPASSWD: /usr/local/lib/nagios/plugins/check_container_upgrade" > /etc/sudoers.d/nagios-containers
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chmod 0400 /etc/sudoers.d/nagios-containers
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echo "command[check_container_upgrade]=sudo /usr/local/lib/nagios/plugins/check_container_upgrade" > /etc/nagios/nrpe.d/containers.cfg
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service nagios-nrpe-server reload
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```
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## Usage
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```
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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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-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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```
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## Copyright
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Copyright (c) 2024 Benjamin Renard <brenard@zionetrix.net>
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## License
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This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 3 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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202
check_container_upgrade
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check_container_upgrade
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#!/bin/bash
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# Monitoring plugin to check if running containers are upgradable
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#
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# Author: Benjamin Renard <brenard@zionetrix.net>
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# Date: Sun, 03 Mar 2024 16:40:19 +0100
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# Source: https://gitea.zionetrix.net/bn8/check_container_upgrade
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#
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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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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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["/usr/lib/nagios/plugins/check_apk"]="/usr/lib/nagios/plugins/check_apk"
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)
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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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fi
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}
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function is_empty() {
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[ $# -gt 0 ] && return 1
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return 0
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}
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function in_array() {
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param=$1;
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shift;
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for elem in "$@";
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do
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[[ "$param" = "$elem" ]] && return 0;
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done;
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return 1
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}
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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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-E [path] Force a specific engine (possible values: ${POSSIBLE_ENGINES[@]}, default: $ENGINE)
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-x [container] Exclude specified container (could be repeat)
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-d Debug mode
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-X Enable bash tracing (=set -x)
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-h Show this message
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EOF
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[ -n "$error" ] && exit 1
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exit 0
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}
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while getopts "hdXE:x:" OPTION
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do
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case $OPTION in
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d)
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DEBUG=1
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;;
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h)
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usage
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;;
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E)
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ENGINE=$OPTARG
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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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fi
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;;
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x)
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EXCLUDED_CONTAINERS+=( $OPTARG )
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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 $OPTION"
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;;
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esac
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done
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ONLY_CONTAINERS=( "${@:$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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then
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debug "Auto-detect engine..."
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for engine in ${POSSIBLE_ENGINES[@]}
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do
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[ "$engine" == "auto" ] && continue
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which "$engine" > /dev/null 2>&1
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if [ $? -ne 0 ]
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then
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debug "$engine not found"
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continue
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fi
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ENGINE="$engine"
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break
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done
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if [ -z "$ENGINE" ]
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then
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echo "UNKNOWN - Fail to auto-detect engine"
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exit 3
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fi
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debug "Auto-detected engine: $ENGINE"
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fi
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EXIT_CODE=0
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declare -A UPTODATE
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declare -A ERRORS
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CHECKED_CONTAINERS=( )
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debug "List running containers..."
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RUNNING_CONTAINERS=$($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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STATUS=""
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for check_plugin in ${CHECK_PLUGINS[@]}
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do
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$ENGINE exec $container test -e $check_plugin > /dev/null 2>&1
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if [ $? -ne 0 ]
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then
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debug "$container - Plugin $check_plugin not found"
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continue
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fi
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debug "$container - Plugin $check_plugin found, use it"
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STATUS="$($ENGINE exec $container ${CHECK_PLUGINS[${check_plugin}]} 2>&1)"
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ex=$?
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debug "$container - Plugin output: $STATUS"
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debug "$container - Plugin exit code: $ex"
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break
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done
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if [ -z "$STATUS" ]
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then
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debug "$container - No check plugin found"
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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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if [ $ex -eq 0 ]
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then
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UPTODATE+=( ["$container"]=$STATUS )
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else
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ERRORS+=( ["$container"]=$STATUS )
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fi
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[ $EXIT_CODE -ge $ex ] && continue
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[ $ex -gt 3 ] && ex=3
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EXIT_CODE=$ex
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done
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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 $CHECKED_CONTAINERS
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then
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debug "$container - Not found"
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ERRORS+=( ["$container"]="Not found" )
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EXIT_CODE=3
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fi
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done
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fi
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debug "Final exit code: $EXIT_CODE"
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case $EXIT_CODE in
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0)
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echo "OK - All containers are uptodate"
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;;
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1)
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echo "WARNING - some containers need to be updated"
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;;
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2)
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echo "CRITICAL - some containers need to be updated"
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;;
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*)
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echo "UNKNOWN - fail to retrieve status of some containers"
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;;
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esac
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for container in ${!ERRORS[@]}
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do
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echo ${container} - ${ERRORS[${container}]}
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done
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for container in ${!UPTODATE[@]}
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do
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echo ${container} - ${UPTODATE[${container}]}
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done
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exit $EXIT_CODE
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