start at boot time

[fometeo]

any suggestion for start dockssh at boot time over CentOS 7 ? it should be basic however I am missing something; dockssh is an excellent utility, thanks.

[alash3al]

you can use systemd, init.rc, pm2 or even docker!

personally I'm using pm2 as it is cross platform and enabling pm2 itself as a boot-time-service using pm2 startup,

here is pm2.

note, the above are just my suggestions, you can use any based on your needs

[fometeo]

Hi. Thank you for the hints about pm2, quite interesting :-)

My problem at CentOS 7.5 was the place dockssh executable was.
Got this error: "open .ssh/id_rsa: no such file or directory" and
"Unregistered Authentication Agent for unix-process:1537:103982"
When at /root it worked. The init.d script was build based on this
https://github.com/wyhasany/sysvinit-service-generator service.sh
named dockssh.sh followed by these commands:

vi /etc/init.d/dockssh.sh
chmod +x /etc/init.d/dockssh.sh
chkconfig --level 345 dockssh.sh on

so it was registered, and worked on boot also

chkconfig --list
dockssh.sh      0:off   1:off   2:off   3:on    4:on    5:on    6:off

just to save time for an eventual reader this was the init.d dockssh.sh used

#!/bin/sh
### BEGIN INIT INFO
# Provides:          DOCKSSH 
# Required-Start:    $local_fs $network $named $time $syslog
# Required-Stop:     $local_fs $network $named $time $syslog
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 6
# Description:       SSH INTO CONTAINERS
### END INIT INFO

SCRIPT="/root/dockssh"
RUNAS=root

PIDFILE=/var/run/dockssh.sh.pid
LOGFILE=/var/log/dockssh.sh.log

start() {
  if [ -f $PIDFILE ] && [ -s $PIDFILE ] && kill -0 $(cat $PIDFILE); then
    echo 'Service already running' >&2
    return 1
  fi
  echo 'Starting service…' >&2
  local CMD="$SCRIPT &> \"$LOGFILE\" & echo \$!"
  su -c "$CMD" $RUNAS > "$PIDFILE"
 # Try with this command line instead of above if not workable
 # su -s /bin/sh $RUNAS -c "$CMD" > "$PIDFILE"
 
  sleep 2
  PID=$(cat $PIDFILE)
    if pgrep -u $RUNAS -f $NAME > /dev/null
    then
      echo "$NAME is now running, the PID is $PID"
    else
      echo ''
      echo "Error! Could not start $NAME!"
    fi
}

stop() {
  if [ ! -f "$PIDFILE" ] || ! kill -0 $(cat "$PIDFILE"); then
    echo 'Service not running' >&2
    return 1
  fi
  echo 'Stopping service…' >&2
  kill -15 $(cat "$PIDFILE") && rm -f "$PIDFILE"
  echo 'Service stopped' >&2
}

status() {
    printf "%-50s" "Checking dockssh ..."
    if [ -f $PIDFILE ] && [ -s $PIDFILE ]; then
        PID=$(cat $PIDFILE)
            if [ -z "$(ps axf | grep ${PID} | grep -v grep)" ]; then
                printf "%s\n" "The process appears to be dead but pidfile still exists"
            else    
                echo "Running, the PID is $PID"
            fi
    else
        printf "%s\n" "Service not running"
    fi
}



case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    status
    ;;
  restart)
    stop
    start
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart}"
esac

[fometeo]

personally I'm using pm2 as it is cross platform and enabling pm2 itself as a boot-time-service using pm2 startup,

after installing yarn and pm2

# yarn global add pm2
yarn global v1.22.4
[1/4] Resolving packages...
[2/4] Fetching packages...
info fsevents@2.1.3: The platform "linux" is incompatible with this module.
info "fsevents@2.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Installed "pm2@4.3.1" with binaries:
      - pm2
      - pm2-dev
      - pm2-docker
      - pm2-runtime
Done in 5.80s.

removed the start from init.d

chkconfig --level 345 dockssh.sh off

rebooted, and applied pm2 start of dockssh - it worked
however dockssh does not start on a system restart

pm2 start /root/dockssh
pm2 startup

can it be done as above, just pm2 to /root/dockssh ?
I guess the fsevents error does not matter.
Anyway init.d method works, just interested about pm2.

---

update - solved

pm2 unstartup
pm2 startup centos -u root --hp /root
pm2 start /root/dockssh
pm2 save