Add script 'check_systemd_service.sh'.
This commit is contained in:
277
check_systemd_service.sh
Executable file
277
check_systemd_service.sh
Executable file
@@ -0,0 +1,277 @@
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#!/usr/bin/env bash
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LOCK_DIR="/tmp/$(basename $0).$$.LOCK"
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log_file="${LOCK_DIR}/${script_name%%.*}.log"
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#---------------------------------------
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#-----------------------------
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# Base Function(s)
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#-----------------------------
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#---------------------------------------
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usage() {
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[[ -n "$1" ]] && error "$1"
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[[ $terminal ]] && echo -e "
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\033[1mUsage:\033[m
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$(basename $0) <Systemd-Service>
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\033[1mDescription\033[m
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Script checks if given service is running and tries to restart service
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if it is not running.
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\033[1mOptions\033[m
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No Options available
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\033[1mExample:\033[m
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Check if apache2 service is runnin. Restart service if needed.
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$(basename $0) apache2
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"
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clean_up 1
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}
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clean_up() {
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# Perform program exit housekeeping
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rm -rf "$LOCK_DIR"
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blank_line
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exit $1
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}
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fatal(){
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echo ""
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if $terminal ; then
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echo -e " [ \033[31m\033[1mFatal\033[m ] $*"
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else
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echo -e " [ Fatal ] $*"
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fi
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echo ""
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if $terminal ; then
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echo -e " \033[1mScript terminated\033[m.."
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else
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echo -e " Script terminated.."
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fi
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clean_up 1
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}
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error (){
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echo ""
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if $terminal ; then
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echo -e " [ \033[31m\033[1mError\033[m ] $*"
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else
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echo " [ Error ] $*"
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fi
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echo ""
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}
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warn (){
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if $LOGGING || $terminal ; then
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echo ""
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if $terminal ; then
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echo -e " [ \033[33m\033[1mWarn\033[m ] $*"
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else
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echo " [ Warn ] $*"
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fi
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echo ""
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fi
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}
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info (){
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if $LOGGING || $terminal ; then
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echo ""
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if $terminal ; then
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echo -e " [ \033[32m\033[1mInfo\033[m ] $*"
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else
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echo " [ Info ] $*"
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fi
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echo ""
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fi
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}
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ok (){
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if $LOGGING || $terminal ; then
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echo ""
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if $terminal ; then
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echo -e " [ \033[32m\033[1mOk\033[m ] $*"
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else
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echo " [ Ok ] $*"
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fi
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echo ""
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fi
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}
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blank_line() {
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if $terminal ; then
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echo ""
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fi
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}
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trim() {
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local var="$*"
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var="${var#"${var%%[![:space:]]*}"}" # remove leading whitespace characters
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var="${var%"${var##*[![:space:]]}"}" # remove trailing whitespace characters
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echo -n "$var"
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}
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# ----------
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# - Jobhandling
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# ----------
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# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
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# -
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trap clean_up SIGHUP SIGINT SIGTERM
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# - Create lock directory '$LOCK_DIR"
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#
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mkdir "$LOCK_DIR"
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#---------------------------------------
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#-----------------------------
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# Check some prerequisites
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#-----------------------------
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#---------------------------------------
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# - Running in a terminal?
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# -
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if [[ -t 1 ]] ; then
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terminal=true
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LOGGING=true
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else
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terminal=false
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LOGGING=false
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fi
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if [[ -n "$1" ]] ; then
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service_name=$1
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else
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error "No Service given!"
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usage
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fi
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# - Systemd supported ?
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# -
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systemd=$(which systemd)
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systemctl=$(which systemctl)
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systemd_supported=false
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if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
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systemd_supported=true
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else
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fatal "Systemd is not present!"
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fi
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if systemctl -t service list-unit-files \
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| grep -e "^${service_name,,}d" \
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| grep -q -E "(enabled|disabled)" 2> /devnull ; then
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SYSTEMD_SERVICE="$(systemctl -t service list-unit-files | grep -e "^${service_name,,}d" | awk '{print$1}' | head -1)"
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elif systemctl -t service list-unit-files \
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| grep -e "^${service_name,,}" \
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| grep -q -E "(enabled|disabled)" 2> /devnull ; then
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SYSTEMD_SERVICE="$(systemctl -t service list-unit-files | grep -e "^${service_name,,}" | awk '{print$1}' | head -1)"
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fi
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if [[ -z "$SYSTEMD_SERVICE" ]]; then
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fatal "Systemd Service '${service_name}' not found!"
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fi
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#---------------------------------------
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#-----------------------------
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# Check if service is running
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#-----------------------------
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#---------------------------------------
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if $LOGGING ; then
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declare -i _length="${#service_name}"
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echo -e "\n Check if $service_name service is running.."
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echo -en " ==============================="
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declare -i i=0
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while [[ $i -lt $_length ]] ; do
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echo -n "="
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((i++))
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done
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echo ""
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fi
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need_restart=false
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if $(systemctl is-active $SYSTEMD_SERVICE > /dev/null 2>&1) ; then
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eval $(systemctl show -p MainPID ${SYSTEMD_SERVICE})
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if [[ -n "$MainPID" ]] && [[ $MainPID -gt 0 ]]; then
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if $(ps ax | grep -q -E "^\s*${MainPID} " 2> /dev/null) ; then
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ok "$service_name service is up and running."
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else
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error "$service_name service seems to be down! Trying to restart service now.."
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need_restart=true
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fi
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else
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ok "$service_name service is up and running."
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warn "Cannot determine MainPID for Service '$service_name', but the status is 'active'."
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fi
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else
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error "$service_name service seems to be down! Trying to restart service now.."
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need_restart=true
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fi
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if $need_restart ; then
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$systemctl daemon-reload > /dev/null 2> $log_file
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if [[ $? -ne 0 ]]; then
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error "$(cat $log_file)"
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fi
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sleep 2
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$systemctl stop $SYSTEMD_SERVICE > /dev/null 2> $log_file
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if [[ $? -ne 0 ]]; then
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error "$(cat $log_file)"
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fi
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sleep 10
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$systemctl start $SYSTEMD_SERVICE > /dev/null 2> $log_file
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if [[ $? -ne 0 ]]; then
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error "$(cat $log_file)"
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fi
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sleep 5
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if $(systemctl is-active $SYSTEMD_SERVICE > /dev/null 2>&1) ; then
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eval $(systemctl show -p MainPID ${SYSTEMD_SERVICE})
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if [[ -n "$MainPID" ]] && [[ $MainPID -gt 0 ]]; then
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if $(ps ax | grep -q -E "^\s*${MainPID} " 2> /dev/null) ; then
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ok "$service_name service is now up and running. New PID is '$MainPID'"
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if ! $terminal ; then
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echo " [ Ok ] service is now up and running. New PID is '$MainPID'"
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fi
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else
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error "Restarting $service_name service failed!"
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fi
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else
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warn "Cannot determine MainPID for Service '$service_name', but the status is 'active'."
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ok "$service_name service is up and running."
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if ! $terminal ; then
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echo " [ Ok ] service is now up and running. New PID is '$MainPID'"
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echo " [ Warn ] Cannot determine MainPID for Service '$service_name', but the status is 'active'."
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fi
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fi
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else
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error "Restarting $service_name service failed!"
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fi
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fi
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clean_up 0
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