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Our server was running fine this morning. I installed VirtualBox and rebooted the server. Since rebooting the server I do not recieve a response when pinging the IP address and I cannot connect through SSH anymore. I have access through KVM.

Does anybody know how I might begin to troubleshoot this? I am posting the process I went through to install VirtualBox incase there was some part of the process that has caused me an issue.

cd /etc/yum.repos.d/
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
yum update
rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
yum install VirtualBox-4.3
service vboxdrv setup
usermod -a -G vboxusers root
VirtualBox

I then connected to the server to set up a virtual machine and created a new virtual Windows 7 machine

ssh -X root@xxxxxxx
VirtualBox

I then rebooted the server and now I no longer recieve a response to my ping requests and I am unable to ssh to the server. I have KVM access.

Does anybody know what I may have done? I have done multiple reboots in the past with no issue so I assume the issue is something to do with VirtualBox.

Many thanks for any help.

Syn
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2 Answers2

3

Does anybody know how I might begin to troubleshoot this?

You know, the usual stuff from the sysadmin kitbag

Use your console access to

  • check your logs and take appropriate action.
  • check you have correctly configured network interfaces
  • check your firewall.
  • check that sshd is running
  • check your change/config management system for other recent stuff
  • ...

You may also find the method here useful

Community
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user9517
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  • http://www.freesound.org/people/Benboncan/sounds/73581/ – user9517 Jun 29 '15 at 11:14
  • You should take this as an opportunity to educate yourself. Reinstalling really isn't a good option. – user9517 Jun 29 '15 at 11:14
  • I'm giving it a good go before I give up and reinstall. There really is too much to lose for me to reinstall now anyway. I am going to take a look and see if sshd is running and configured correctly. The firewall settings are correct so I will take it step by step! – Syn Jun 29 '15 at 11:15
  • Yaay Iain, +1 from me. Though as a trombonist with an aversion to flash, I can't say I appreciate the link above. – MadHatter Jun 29 '15 at 11:15
  • Is that better @MadHatter ? – user9517 Jun 29 '15 at 11:17
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    Infinitely slightly so, yes. Thanks. I'm going off to do some practice. – MadHatter Jun 29 '15 at 11:23
  • Looks like I might be having some trouble with the network setup. Seems that something I have done has wiped /etc/sysconfig/network-scripts/ – Syn Jun 29 '15 at 11:29
  • Thank you for your help Iain. I have figured the issue out (or at least a resolution!) and have learnt a lot! – Syn Jun 29 '15 at 12:00
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Something during the VirtualBox setup had changed my /etc/sysconfig/network-scripts and stopped the nameservers setting correctly.

To resolve this I turned off Network Manager

/etc/init.d/NetworkManager stop
/sbin/chkconfig NetworkManager off

Added

NM_CONTROLLED="no"

to /etc/sysconfig/network-scripts/ifcfg-eth0 and manually edited /etc/resolv.conf with vi to the correct nameservers. Rebooted the server and issue seems to have gone away!

Syn
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