Adding check_gitlab_readiness.sh
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nagios/check_gitlab_readiness.sh
Executable file
203
nagios/check_gitlab_readiness.sh
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#!/bin/bash
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# Little monitoring script to check the readiness of a Gitlab instance.
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#
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# Remember that you have to whitelist the IP of your monitoring system :
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# gitlab.rb:
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# gitlab_rails['monitoring_whitelist'] = ['127.0.0.0/8', '::1/128', ...]
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# See https://docs.gitlab.com/ee/administration/monitoring/health_check.html
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#
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# Licence: WTFPL
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# Copyright: chl-dev@bugness.org 2024
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PROGPATH=$( echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,' )
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REVISION="0.1"
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# Default values
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GITLAB_HOSTNAME="localhost"
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GITLAB_URL=""
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GITLAB_URL_PROTOCOL="https"
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NB_CHECKS_RANGE="15:20"
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# Include check_range() and STATE_OK, STATE_WARNING, ... variables
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. $PROGPATH/utils.sh
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# Output
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OUTPUT_CPT_CHECKS=0
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OUTPUT_EXIT_STATUS=0
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OUTPUT_DETAIL_OK=""
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OUTPUT_DETAIL_WARNING=""
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OUTPUT_DETAIL_CRITICAL=""
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OUTPUT_DETAIL_UNKNOWN=""
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OUTPUT_PERFDATA=""
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# Stop at first uncaught error
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set -eu
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# Wrapper to use whatever is available to make HTTP queries
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fetch_with_curl_wget_or_whatever () {
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if which "wget" >/dev/null 2>&1; then
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wget -q -O - "$1"
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elif which "curl" >/dev/null 2>&1 ; then
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curl -s "$1"
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else
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echo "UNKNOWN: no wget/curl/whatever available to make HTTP queries."
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exit $STATE_UNKNOWN
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fi
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}
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check_http_status_200() {
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if which "wget" >/dev/null 2>&1; then
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wget -q --spider "$1"
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elif which "curl" >/dev/null 2>&1 ; then
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test "$( curl -s -o /dev/null -I -w "%{http_code}" "$1" )" == "200"
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else
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echo "UNKNOWN: no wget/curl/whatever available to make HTTP queries."
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exit $STATE_UNKNOWN
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fi
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}
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print_full_url() {
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if [ -n "$GITLAB_URL" ]; then
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echo "$GITLAB_URL"
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else
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echo "$GITLAB_URL_PROTOCOL://$GITLAB_HOSTNAME/-/readiness?all=1"
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fi
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}
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# Help function
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usage() {
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cat <<EOF
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Usage :
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$0 [-H hostname] [-U full_URL] [-sS] [ -c nb_checks_range ]
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-c Expected number of checks
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-s Use HTTP to query the hostname
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-S Use HTTPS to query the hostname (default)
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Examples:
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./check_gitlab.sh -H forge.example.net
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./check_gitlab.sh -U https://forge.example.net/ -c 20:42
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Default values:
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full_URL: $( print_full_url )
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nb_checks_range: $NB_CHECKS_RANGE
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EOF
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}
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# Loop on parameters
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while getopts c:hH:sSU: f; do
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case "$f" in
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'c')
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NB_CHECKS_RANGE="$OPTARG"
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;;
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'h')
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usage
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exit
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;;
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'H')
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GITLAB_HOSTNAME="$OPTARG"
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GITLAB_URL="" # To generate the URL from the hostname, see print_full_url()
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;;
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's')
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GITLAB_URL_PROTOCOL="http"
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;;
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'S')
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GITLAB_URL_PROTOCOL="https"
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;;
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'U')
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GITLAB_URL="$OPTARG"
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;;
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?)
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usage
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exit 1
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;;
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esac
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done
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if ! which jq >/dev/null; then
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echo "UNKNOWN command 'jq' not available."
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exit $STATE_UNKNOWN
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fi
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# First, let's check that the URL responds with 200/OK
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#if ! check_http_status_200 "$( print_full_url )"; then
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# echo TODO later. Since it needs 2 queries, it could lead to inconsistencies if we get a 200 now and an error later.
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# Would the best way be to set another probe ?
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# check_https!-H $HOSTNAME$ -f warning -u /-/readiness?all=1
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# check_https!-H $HOSTNAME$ -f warning -u /-/health -s "GitLab OK"
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#fi
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if ! JSONDATA="$( fetch_with_curl_wget_or_whatever "$( print_full_url )" )"; then
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echo "UNKNOWN error fetching the URL '$( print_full_url )'"
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exit $STATE_UNKNOWN
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fi
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while read KEY; do
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OUTPUT_CPT_CHECKS=$(( $OUTPUT_CPT_CHECKS + 1 ))
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if [ "$KEY" == "status" ]; then
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STATUS="$( printf "%s\n" "$JSONDATA" | jq ".$KEY" )"
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else
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STATUS="$( printf "%s\n" "$JSONDATA" | jq ".$KEY[0].status" )"
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fi
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if [ "$STATUS" != '"ok"' ]; then
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OUTPUT_DETAIL_CRITICAL="$( printf "%s Status for key '$KEY': %s" "$OUTPUT_DETAIL_CRITICAL" "$STATUS" )"
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OUTPUT_EXIT_STATUS=$STATE_CRITICAL
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fi
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done <<EOF
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$( printf "%s\n" "$JSONDATA" | jq 'keys[]' | sed 's/\(^"\|"$\)//g' )
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EOF
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# Let's check that the number of checks checks out
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set +e
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check_range "$OUTPUT_CPT_CHECKS" "$NB_CHECKS_RANGE"
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STATUS="$?"
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set -e
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if [ "$STATUS" -eq 0 ]; then
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if [ "$OUTPUT_EXIT_STATUS" == "$STATE_OK" ]; then
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OUTPUT_EXIT_STATUS=$STATE_WARNING
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OUTPUT_DETAIL_WARNING="$OUTPUT_DETAIL_WARNING Nb checks outside of range: $OUTPUT_CPT_CHECKS / $NB_CHECKS_RANGE"
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fi
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elif [ "$STATUS" -eq 2 ]; then
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if [ "$OUTPUT_EXIT_STATUS" != "$STATE_CRITICAL" ]; then
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OUTPUT_EXIT_STATUS=$STATE_UNKNOWN
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OUTPUT_DETAIL_UNKNOWN="$OUTPUT_DETAIL_UNKNOWN check_range() on error: $OUTPUT_CPT_CHECKS / $NB_CHECKS_RANGE"
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fi
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fi
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# final output
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case "$OUTPUT_EXIT_STATUS" in
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"$STATE_OK")
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printf "OK $OUTPUT_DETAIL_OK"
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;;
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"$STATE_WARNING")
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printf "WARNING $OUTPUT_DETAIL_WARNING"
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;;
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"$STATE_CRITICAL")
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printf "CRITICAL $OUTPUT_DETAIL_CRITICAL"
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;;
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"$STATE_UNKNOWN")
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printf "UNKNOWN $OUTPUT_DETAIL_UNKNOWN"
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;;
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*)
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printf "WTF"
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;;
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esac
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# Add the checks counter to the perfdata
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OUTPUT_PERFDATA="$( printf "%s\n%s" "$OUTPUT_PERFDATA" "nb_checks=$OUTPUT_CPT_CHECKS;$NB_CHECKS_RANGE;;0" )"
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# We sort the perfdata because of a weird bug in some icinga/pnp4nagios interactions
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printf "|%s\n" "$( printf "%s" "$OUTPUT_PERFDATA" | sort | grep -v "^$" | tr "\n" " " )"
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exit "$OUTPUT_EXIT_STATUS"
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