GitLab localhost health-checker for cron

check-gitlab-health.sh

#!/bin/bash
# Created 2019 by Ryan Sawhill Aroha <[email protected]>
# Ref: https://docs.gitlab.com/ee/user/admin_area/monitoring/health_check.html

rc=0
url="https://localhost/-"
endpoints="readiness liveness"

file1=$(mktemp) file2=$(mktemp)
trap "rm -rf $file1 $file2" EXIT INT

print_tsv() {
    cat >$file2
    if jq -e .error $file2 &>/dev/null; then
        jq -r 'to_entries[] | [.key, .value] | @tsv' $file2
    else
        jq -r '.status=[{"status":.status}] | to_entries[] | [.key, .value[].status] | @tsv' $file2 | column -t
    fi
}

check_endpoint() {
    local e=$1
    if ! curl -sSk $url/$e >$file1; then
        echo Hit error accessing GitLab $e endpoint
        return 1
    elif ! jq -e . $file1 >/dev/null; then
        echo GitLab $e probe produced invalid json output
        return 1
    elif jq -e .error $file1 &>/dev/null; then
        echo GitLab $e probe shows errors
        print_tsv <$file1
        return 1
    elif ! jq -e '.status=[{"status":.status}]' $file1 >$file2; then
        echo Error munging GitLab $e probe output to rearrange global status
        return 1
    elif [[ $(jq -r .[][].status $file2 | sort -u) != ok ]]; then
        echo GitLab $e probe reports problems
        print_tsv <$file1
        return 1
    fi
}


# Verbose mode just prints everything and exits

if [[ $1 == -v ]]; then
    printf "Health: "
    curl -sSk $url/health
    echo -e "\n"
    for e in $endpoints; do
        echo GitLab $e probe:
        curl -sSk $url/$e | print_tsv
        echo
    done
    exit 0
fi

# Otherwise conditionally print on failure

if [[ $(curl -skL $url/health) != "GitLab OK" ]]; then
    echo GitLab/health reports application server not running
    curl -sSik $url/health
    exit 1
fi

for e in $endpoints; do
    check_endpoint $e || rc=1
done

exit $rc