turn the server on after rebooting

Question

I have a server with CentOs 6.6 and I was trying to reboot it with the command reboot. It was taking forever and I thought the terminal in my mac froze and so I quitted the terminal app from my mac.

20 minutes have passed and now I can not login usin ssh. It shows me:

ssh: connect to host xxxx port 22: Operation timed out

Is my server turned off? What shoud I do? How can I turn the server on?

Thank you

`Operation timed out` usually points to a firewall problem. If the sshd wouldn't be running your ssh client would give a different error (`connection refused` or something like that). Log on to your server locally and check the firewall settings to allow incoming SSH connections. — Gerald Schneider, Aug 14 '15 at 08:41
@GeraldSchneider You won't get connection refused if the server is turned off. — kasperd, Aug 14 '15 at 08:46

HBruijn · Accepted Answer · 2015-08-14T08:42:00.123

You'll need to log into the console when you can't access the OS normally. That allows you to see why the server is hanging on (re-) boot, resolve networking and firewall issues etc.

Typically enterprise class server hardware comes with provisions for out of band management, either based on the open IPMI standard or the more proprietary options such as HP's ILO, Dell's DRAC, Oracle/SUN ILOM, which allows you to access the console even though the OS (your SSH session) is not available.

Many VPS providers also allow you access to the console through their server management panel.

Sometimes waiting is sufficient, some processes may take a fair bit of time to shut correctly and some hardware takes a long time to pass the POST stage and if you have a large amount of storage undergoing a manadatory fsck that too can take some time.

Since you mention Hetzner in your comments: http://wiki.hetzner.de/index.php/LARA/en

i didn't understand what you said in the first 2 paragraphs but I will wait for some more minutes. thank you — user1349390, Aug 14 '15 at 08:41
and I need to request Lara in order to use it and that takes some time from hetzner. I just emailed them — user1349390, Aug 14 '15 at 08:47

score 1 · Answer 2 · answered Aug 14 '15 at 08:34

1

lets see the options your have:

press the power button
send a wake on lan magic packet if u know the mac adres (check the router arp table maybe if u dont have it) if you have WOL on your network card

answered Aug 14 '15 at 08:34

Koen van der Rijt

393
1
11

well the server is located in germany at hetzner. I can't press the power button – user1349390 Aug 14 '15 at 08:38
1

Then use Hetzner's host administration interface, or call Hetzner support to do it for you. – Tilman Schmidt Aug 14 '15 at 08:39
if its in a data center.. call in and ask them to press the button.. – Koen van der Rijt Aug 14 '15 at 08:39
1

@user1349390 Through their [webinterface](https://robot.your-server.de) you can request that a rescue image is booted over PXE next time the server comes up, and you can trigger the reset line to your server. – kasperd Aug 14 '15 at 08:50

score 0 · Answer 3 · answered Apr 11 '16 at 12:58

Worth having a read of this article, summarised below. I run some Hetzner servers and have fallen foul of panicking over re-gaining SSH access after a reboot or reset.

Most regular servers at the Hetzner datacenter are running Software RAID. It seems that after a reboot (especially if you send a Hardware Reset) the OS needs some time to re-sync or check the file system. I am not sure what caused the delay in my case. Re-syncing the entire RAID array can take up to 1-2 hours, depending on your hardware and disc space.

So, wait at least 1 hour for it to come online, especially after a hardware reset! When you activate Hetzner’s Rescue system (which is very good btw!) it will stay active for a minimum of 1 hour, so your server will be down for 1 hour at least, in any event. So you are not losing much by waiting a bit longer.

turn the server on after rebooting

3 Answers3