Replace script 'check_zombies_php-cgi.sh' by 'clean_up_from_zombies.sh'.
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240
clean_up_from_zombies.sh
Executable file
240
clean_up_from_zombies.sh
Executable file
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#!/usr/bin/env bash
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working_dir="$(dirname $(realpath $0))"
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# -------------
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# - Some Variables
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# -------------
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LOCK_DIR="/tmp/$(basename $0).LOCK"
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KILL_SIGNAL=HUP
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CHECK_COMMANDS="$*"
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# -------------
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# - Some functions
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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 $0) COMMAND [COMMAND] ..
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\033[1mDescription\033[m
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Searches for zombie (defunct) child prozesses from given command(s). If such
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processes exists, the script tries to kill them by sending a HUP signal to
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the parent process.
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At least one command as a cammand line option must be gicen.
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\033[1mExample:\033[m
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Search for (and delete) defunct child prozesses of parent '/usr/local/php/bin/php-cgi'
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$(basename $0) /usr/local/php/bin/php-cgi
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Search for (and delete) defunct child prozesses of parent processes
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'/usr/local/sympa/bin/sympa_msg.pl' and '/usr/local/sympa/bin/bulk.pl'
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$(basename $0) /usr/local/sympa/bin/sympa_msg.pl /usr/local/sympa/bin/bulk.pl
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"
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clean_up 1
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}
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clean_up() {
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# Perform program exit housekeeping
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rm -rf "$LOCK_DIR"
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exit $1
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}
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trim() {
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local var="$*"
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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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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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echo ""
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echo -e " \033[31m\033[1mScript was interupted\033[m!"
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else
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echo "[ Fatal ]: $*"
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echo ""
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echo " Script was terminated...."
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fi
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echo ""
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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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echo ""
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if $terminal ; then
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echo -e " [ \033[33m\033[1mWarning\033[m ]: $*"
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else
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echo "[ Warning ]: $*"
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fi
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echo ""
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}
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info (){
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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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}
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info_terminal (){
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if $terminal ; then
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echo ""
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echo -e " [ \033[32m\033[1mInfo\033[m ]: $*"
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echo ""
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fi
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}
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ok (){
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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 ]: $*"
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fi
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echo ""
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}
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# -------------
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# - Check some prerequisites
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# -------------
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# - Is this script running on terminal ?
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# -
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if [[ -t 1 ]] ; then
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terminal=true
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else
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terminal=false
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fi
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# - Print help?
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# -
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if [[ "$(trim $*)" = "-h" ]] || [[ "$(trim $*)" = "--help" ]] ; then
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usage
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fi
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if [[ -z "$(which basename)" ]]; then
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fatal 'It seems "basename" is not installed, but needed!'
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fi
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if [[ -z "$(which realpath)" ]]; then
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fatal 'It seems "realpath" is not installed, but needed!'
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fi
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if [[ -z "$CHECK_COMMANDS" ]]; then
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usage "At least one command must be given."
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else
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for _COMMAND in ${CHECK_COMMANDS[@]} ; do
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if [[ ! -x "$_COMMAND" ]]; then
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fatal "no binary/script '$_COMMAND' found on the server"
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fi
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done
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fi
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# -------------
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# - Jobhandling
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# -------------
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# - If job already runs, stop execution..
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# -
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if mkdir "$LOCK_DIR" 2> /dev/null ; then
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## - Remove lockdir when the script finishes, or when it receives a signal
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trap clean_up SIGHUP SIGINT SIGTERM
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else
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datum="$(date +"%d.%m.%Y %H:%M")"
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fatal "A previos instance of that script \"$(basename $0)\" seems already be running."
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exit 1
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fi
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# -------------
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# Checking ..
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# -------------
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if $terminal ; then
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echo ""
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echo -e " \033[1mCheck for zombie (defunct) child prozesses\033[m"
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echo " =========================================="
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fi
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for _COMMAND in ${CHECK_COMMANDS[@]} ; do
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if $(ps -Ao"stat,command" | grep "$(basename ${_COMMAND})" | grep -v grep | grep -e '^[zZ]' > /dev/null 2>&1)
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then
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warn "Found Zombie Processes '${_COMMAND}' on '$(hostname -f)':"
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ps -Ao"stat,user,pid,ppid,command" | grep "$(basename ${_COMMAND})" | grep -v grep | grep -e '^[zZ]'
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membefore=$(cat /proc/meminfo | grep Committed_AS | awk '{print $2}')
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info "Trying a graceful kill to the concerning parents with signal '$KILL_SIGNAL' .."
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# - Sending the kill signal
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# -
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ps -Ao"stat,pid,ppid,command" | grep "$(basename ${_COMMAND})" | grep -v grep | grep -e '^[zZ]' \
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| awk '{ print $3 }' | sort -u | xargs --no-run-if-empty kill -$KILL_SIGNAL
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if [[ "$?" -eq 0 ]];then
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sleep 10
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ok "Cleaning up zombie processes '${_COMMAND}' seems succsessfully finisched"
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memafter=`cat /proc/meminfo | grep Committed_AS | awk '{print $2}'`
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info "`expr $membefore - $memafter` KB RAM has been freed"
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else
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error "Cleaning up zombie processes '${_COMMAND}' failed!"
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fi
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else
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info_terminal "No zombie prossses '${_COMMAND}' found."
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fi
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done
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if $terminal ; then
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echo ""
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fi
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clean_up 0
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