Estou tentando executar um programa com interface ncurse como um daemon usando screen. Quero usar start-stop-daemon para gerenciar o processo, mas estou tendo problemas para criar um script de inicialização SysV.
Variáveis:
NAME=rtorrent
CHDIR=/opt/$NAME
DAEMON=$NAME
DAEMON_ARGS="-d -m -S $NAME $DAEMON &> /dev/null"
USER=media
GROUP=media
PIDFILE=/var/run/$NAME.pid
Atualmente, minha função inicial é esta:
do_start()
{
# Return
# 0 if daemon has been started
# 1 if daemon was already running
# 2 if daemon could not be started
pgrep -F $PIDFILE > /dev/null 2>&1 || return 1
start-stop-daemon --start --quiet --make-pidfile --pidfile $PIDFILE --chuid $USER:$GROUP --chdir $CHDIR --background --exec screen -- $DAEMON_ARGS || return 2
}
Mas isso está armazenando o sleepID do processo. É concebível que o daemon possa cair e deixar o sleepprocesso em execução
Minha função stop precisa parar ambos, então eu tenho:
do_stop()
{
# Return
# 0 if daemon has been stopped
# 1 if daemon was already stopped
# 2 if daemon could not be stopped
pgrep -F $PIDFILE > /dev/null 2>&1 || return 1
for i in `ps -C $NAME -o pid=` ; do kill $i ; done
pgrep -F $PIDFILE > /dev/null 2>&1 || return 2
# Many daemons don't delete their pidfiles when they exit.
rm -f $PIDFILE
}
O que deve funcionar (ainda não testado), mas com o problema de derrubar qualquer outro processo criado por qualquer outro usuário com $NAMEas no nome ou nos argumentos.
Acho que minha solução é fazer com que minha psfunção retorne apenas pids de nomes de processos $NAMEcriados por $USER. Uma vez que este daemon será executado sob um ID de usuário dedicado.
Não tenho certeza de como obter essa saída. ps -C $NAME -u $USER o pid=me dá uma lista para cada partida, mas quero uma lista para ambas as partidas. Caso eu decida que este usuário pode lidar com algum outro processo posteriormente.
Além disso, que tal recarregar?
start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAMErecarregará o screenprocesso, recarregará o daemon? Existe uma maneira melhor? Qualquer ajuda muito apreciada.
Responder1
Eu precisava do mesmo para um servidor Minecraft Bedrock como um daemon, mas meupatoduckgo-funão estava conseguindo encontrar uma solução... eventualmente, embora eu tenha montado o seguinte script de inicialização.
O ponto principal a ser observado é que start-stop-deamonnão é usado para iniciar a sessão de tela, executamos screenemdaemon(desconectado) diretamente.
#!/bin/sh
### BEGIN INIT INFO
# Provides: PocketMine-MP
# Required-Start: $network $remote_fs $local_fs
# Required-Stop: $network $remote_fs $local_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: PocketMine-MP (Minecraft Bedrock/PE).
# Description: PocketMine-MP (Minecraft Bedrock/PE) Server for my children and tribe.
### END INIT INFO
# Auhtor: Daniel Sokolowski <[email protected]>
# Install by typing update-rc.d <FILEsNAME> defaults
sPATH=/sbin:/usr/sbin:/bin:/usr/bin
sNAME=PocketMine-MP
sDAEMON=/usr/local/PocketMine-MP/start.sh
sDAEMON_ARGS=""
sUSER=$sNAME # can't have - in usernmae
sCONFFILE=/usr/local/PocketMine-MP/server.properties
sPIDFILE=/var/run/$sNAME.pid
sCHDIR=/var/lib/$sNAME
# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh
# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions
# Check if user exists
if ! id -u $sUSER > /dev/null 2>&1; then
echo "The user does not exist; adapt and execute below commands to create it:"
echo ""
echo "root@sh1:~# adduser --home /usr/local/$sNAME/ --shell /bin/false --no-create-home --ingroup daemon --disabled-password --disabled-login $sUSER"
echo "..."
echo "root@sh1:~# chown $sNAME:daemon /usr/local/$sNAME/ -R"
exit 1
fi
# Exit if the package is not installed
[ -x $sDAEMON ] || exit 0
# Read configuration variable file if it is present
# [ -r /etc/default/$sNAME ] && . /etc/default/$sNAME
# do_start()
# =========
# Function that starts the deamon/service
# Returns:
# 0 if daemon has been started
# 1 if daemon was already running
# 2 if daemon could not be started
do_start() {
if ! [ -f $sCONFFILE ]; then
echo "$sNAME is not configured so not starting. Please create configuration file `$sCONFFILE`.">&2
return 2
fi
# Directory in /var/run may disappear on reboot (e.g. when tmpfs used for /var/run).
#mkdir -p $sRUNDIR
#chown -R $sUSER: $sRUNDIR
#chmod -R ug=rwX,o= $sRUNDIR
# If using `start-stop-deamon` uncomment the below and comment `screen`
<<'COMMENT' # see https://unix.stackexchange.com/questions/37411/multiline-shell-script-comments-how-does-this-work
start-stop-daemon --start --verbose --pidfile $sPIDFILE --exec $sDAEMON --name $sNAME --user $sUSER --test || return 1 # deamon is already running
start-stop-daemon --start --verbose --pidfile $sPIDFILE --exec $sDAEMON --name $sNAME --user $sUSER --chdir $sCHDIR -- $sDAEMON_ARGS $sDAEMON_OPTS || return 2 # deamon could not be started
return 0 # things worked
COMMENT
# if using screen , #NOTE,2019-feb-26: using "" after user will error out as it treats it as a "command foo - bar" command
sudo --user=$sUSER /usr/bin/screen -d -m -S $sNAME $sDAEMON $sDAEMON_ARGS
sleep 5
pgrep -f PocketMine-MP | tail -1 > $sPIDFILE
}
# do_stop()
# =========
# Function that stops the daemon/service
# Reeturns:
# 0 if daemon has been stopped
# 1 if daemon was already stopped
# 2 if daemon could not be stopped
# other if a failure occurred
do_stop()
{
# if using start-stop-deamon
#<<'COMMENT'
#start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $sPIDFILE
start-stop-daemon --stop --verbose --retry=TERM/30/KILL/5 --pidfile $sPIDFILE
RETVAL="$?"
[ "$RETVAL" = 2 ] && return 2
# Wait for children to finish too if this is a daemon that forks
# and if the daemon is only ever run from this initscript.
# If the above conditions are not satisfied then add some other code
# that waits for the process to drop all resources that could be
# needed by services started subsequently. A last resort is to
# sleep for some time.
#start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
#[ "$?" = 2 ] && return 2
# Many daemons don\'t delete their pidfiles when they exit.
rm -f $sPIDFILE
sleep 5s
return "$RETVAL"
#COMMENT
# if using `screen` for interactive programs
}
# do_reload()
# ===========
# Function that sends a SIGHUP to the daemon/service
#
# If the daemon can reload its configuration without restarting (for example, when it is sent a SIGHUP), then implement that here.
do_reload() {
# PocketMine does support SIGHUP https://github.com/PocketMine/PocketMine-MP/blob/master/src/pocketmine/Server.php#L2026
#start-stop-daemon --stop --quiet --pidfile $sPIDFILE --name $sNAME --user $sUSER --signal HUP
start-stop-daemon --stop --verbose --pidfile $sPIDFILE --name $sNAME --user $sUSER --signal HUP
}
case "$1" in
start)
[ "$VERBOSE" != no ] && log_daemon_msg "Starting \`$sDAEMON\` " "$sNAME"
do_start
case "$?" in
0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
esac
;;
stop)
[ "$VERBOSE" != no ] && log_daemon_msg "Stopping \`$sDAEMON\`" "$sNAME"
do_stop
case "$?" in
0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
esac
;;
status)
status_of_proc "$sDAEMON" "$sNAME" && exit 0 || exit $?
;;
reload|force-reload)
log_daemon_msg "Reloading \`$sDAEMON\`" "$sNAME"
do_reload
log_end_msg $?
;;
restart)
log_daemon_msg "Restarting \`$sDAEMON\`" "$sNAME"
do_stop
case "$?" in
0|1)
do_start
case "$?" in
0) log_end_msg 0 ;;
1|*) log_end_msg 1 ;;
esac
;;
*) log_end_msg 1 ;;
esac
;;
*)
echo "Usage: \`/etc/init.d/`basename "$0"` {start|stop|status|restart|force-reload}\`" >&2
exit 3
;;
esac
exit 0