Weird! Can't start SSH service on a OpenVZ VPS

Zeno

I purchased a Ramnode OpenVZ 128M VPS(Node:ATLSVZ1) has been running well until two days ago

After the reboot, SSH can not connect,I can only use "serial console" access to the system

and I can't start OpenSSH-server even Dropbear
Can anyone help me figure out why? Any suggestions will be appreciated, Thanks a lot!

root@ssd:/# ps auxf
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 1.0 2500 1352 ? Ss 17:38 0:00 init
root 2 0.0 0.0 0 0 ? S 17:38 0:00 [kthreadd/1946]
root 3 0.0 0.0 0 0 ? S 17:38 0:00 _ [khelper/1946]
root 252 0.0 0.6 2332 904 ? Ss 17:38 0:00 cron
root 502 0.0 0.5 27476 760 ? Ss 17:41 0:00 vzctl: pts/0
root 503 0.0 1.2 3000 1648 pts/0 Ss 17:41 0:00 _ -bash
root 533 0.0 0.6 2388 880 pts/0 R+ 17:58 0:00 _ ps auxf

root@ssd:/# free -m
total used free shared buffers cached
Mem: 128 28 99 0 0 25
-/+ buffers/cache: 2 125
Swap: 128 0 128

root@ssd:/# /etc/init.d/ssh start
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service ssh start

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the start(8) utility, e.g. start ssh
ssh stop/pre-start, process 581

root@ssd:/# /etc/init.d/dropbear start
Starting Dropbear SSH server: dropbear.

root@ssd:/# netstat -nl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
Active UNIX domain sockets (only servers)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 1033737609 @/com/ubuntu/upstart

Damian

Are you seeing messages in /var/log/messages or any of the associated processes' log files?

Kris

After starting dropbear or ssh....

ps ax|grep dropbear

Get the process ID (PID) and use strace to see where it's failing / timing out.

Should see some activity / errors when trying to connect to the port once the daemon's started.

strace -p [PID]

Zeno

@Damian said: Are you seeing messages in /var/log/messages or any of the associated processes' log files?

Thanks, No, the /var/log/messages is empty

root@ssd:/# date
Sun Mar 24 23:05:52 CST 2013

root@ssd:/# cat /var/log/messages
Jan 9 06:51:30 ssd syslogd 1.5.0#5ubuntu4: restart.
Jan 9 06:56:53 ssd exiting on signal 15
Jan 9 06:56:55 ssd syslogd 1.5.0#5ubuntu4: restart.
Jan 9 06:58:18 ssd exiting on signal 15

Zeno

@Kris said: After starting dropbear or ssh....

Thanks Kris, I tried but can't get any process ID (PID) by name dropbear/ssh:

Dropbear

root@ssd:/# /etc/init.d/dropbear start
Starting Dropbear SSH server: dropbear.

root@ssd:/# ps ax|grep dropbear
1021 pts/0 S+ 0:00 grep --color=auto dropbear

OpenSSH-Server

root@ssd:/# /etc/init.d/ssh start
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service ssh start

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the start(8) utility, e.g. start ssh
ssh stop/pre-start, process 1132

root@ssd:/# ps ax|grep ssh
1135 pts/0 S+ 0:00 grep --color=auto ssh

root@ssd:/# strace -p 1132
attach: ptrace(PTRACE_ATTACH, ...): No such process

rds100

Sshd keys present in /etc/ssh/ssh_hostkey ?