OpenSSH server restarts twice when booting (Ubuntu 9.10)

cheber · 03-20-2010, 09:06 PM

Changes I've made to the config files:

/etc/pam.d/sshd
UsePAM no

/etc/ssh/ssh_config
AuthorizedKeysFile %h/.ssh/authorized_keys
PasswordAuthentication no

Connecting with PuTTy works fine with my public/private keys. But why does sshd start and then restart twice when booting? I tried looking in the logfiles under /var/log/ for anything with ssh/sshd but nothing shows up.

"Starting OpenBSD secure shell server sshd."
"Restarting OpenBSD secure shell server sshd."
"Restarting OpenBSD secure shell server sshd."

Ubuntu Server 9.10

grail · 03-21-2010, 02:19 AM

Did you look at the startup script in either /etc/init or /etc/init.d
I would be guessing this is the first place to look as it is a startup issue

lupusarcanus · 03-21-2010, 04:24 AM

You could try having the daemon be the last to startup.

Location in boot-up sometimes is the culprit of problems such as these.

Whether it fails or succeeds, make sure you post back & let us know.

cheber · 03-21-2010, 04:30 AM

I removed a dead link for noip2 and now when I rebooted I only got one restart of sshd, though I somehow doubt it's the reason I had two restarts.
I've looked in /etc/rc2.d and I only got one link for sshd "S16ssh -> ../init.d/ssh"

Isn't it only the "start" section that should run at boot if only S16ssh exist under rc2.d?

Code:

case "$1" in
  start)
        check_privsep_dir
        check_for_no_start
        check_dev_null
        log_daemon_msg "Starting OpenBSD Secure Shell server" "sshd"
        if start-stop-daemon --start --quiet --oknodo --pidfile /var/run/sshd.pid --exec /usr/sbin/sshd -- $SSHD_OPTS; then
            log_end_msg 0
        else
            log_end_msg 1
        fi
        ;;

grail · 03-21-2010, 05:52 AM

That would seem to be correct but for some reason, something is calling the restart.
Maybe if you grep -r "ssh restart" /etc/init.d/* might give us a clue if something else is calling it as well?

cheber · 03-21-2010, 01:31 PM

I changed S16ssh to S99ssh. SSH is still restarting at then end, sometimes once and sometimes twice.

grep -r "ssh restart" /etc/init.d/*
It gives me no hit at all.

Anyone know an easy way to log the script messages (e.g. "Starting OpenBSD secure shell server sshd.")? I've Googled a bit but I've found no solution. It's annoying that I have to go check the server when I've set up ssh.

cheber · 03-21-2010, 05:21 PM

I goggled a bit better and found this (I also have two network interfaces). If I understand it correctly he just makes it so the messages don't show up during boot, but ssh will still restart twice. I don't really see a reason to hide it.

Quote:

Originally Posted by sciburst

I am not sure if you are still looking for a solution. I was investigating the same issue and came across this bug:

https://bugs.launchpad.net/ubuntu/+s...cp/+bug/390556

It was suggested there that the script /etc/network/if-up.d/openssh-server is invoked to restart sshd when the network interface comes up. I did some tests and was able to confirm this. I have two interfaces on my server and my sshd was restarted twice during the boot-up sequence. The output redirection found in openssh-server unfortunately did not work as intended:

invoke-rc.d ssh restart >/dev/null 2>&1 || true

thanks to the log_daemon_msg BASH function used through out /etc/init.d/ssh. So my easy way out of this situation was to change line 117 of /etc/init.d/ssh from

log_daemon_msg "Restarting OpenBSD Secure Shell server" "sshd"

to

echo "Restarting OpenBSD Secure Shell server sshd"

My server now boots up with no additional SSH-related messages in the console.

http://ubuntuforums.org/showthread.php?t=1122889