changing hostname for proxmox hypervisor

below steps can be used to get hostname changed for a existing running Proxmox server

Tried and tested on Proxmox version 3.4-6, Please use in dev environment first to gain more confidence.

nano /etc/hosts
nano /etc/hostname
nano /etc/postfix/main.cf
cd /etc/pve/nodes/
cp -r old new
rm -r old
cd /var/lib/rrdcached/db/pve2-node/
cp -r old new
rm -r old

Regards,

Sandeep Panchal

Proxmox VE error "no accelerator found"

Proxmox is a opensource Hyper-visor solution.

It is meant for installation on physical servers but for practice, while trying to use it on a laptop/desktop having virtual box installed on it. Base Proxmox installation on virtualbox VM went error free.

While getting VM started created inside the proxmox created in virtuallbox an error observed i.e. "no accelerator found"

below ink has solution for the same.

https://www.youtube.com/watch?v=_D9XTAzXECE

Regards
Sandeep Panchal

What exactly does "POSSIBLE BREAK-IN ATTEMPT" mean?

"What exactly does "POSSIBLE BREAK-IN ATTEMPT" mean?"

This means that the netblock owner did not update the PTR record for a static IP within their range, and said PTR record is outdated, OR an ISP does not setup proper reverse records for its dynamic IP customers. This is very common, even for large ISPs.

You end up getting the msg in your log because someone coming from an IP with improper PTR records (due to one of the reasons above) is trying to use common usernames to try SSH into your server (possibly bruteforce attack, or maybe an honest mistake).

To disable these alerts, you have two choices:

1) If you have a static IP, add your reverse mapping to your /etc/hosts file (see more info here):

10.10.10.10 server.remotehost.com

2) If you have a dynamic IP and really want to make those alerts go away, comment out the "GSSAPIAuthentication yes" in your /etc/ssh/sshd_config file.

Nagios - Customizing your notifcaitons

http://nagios.fm4dd.com/howto/nagios-flexible-notifications.htm

Prerequisites
http://nagios.fm4dd.com/howto/manual/nagios_send_service_mail.htm
http://nagios.fm4dd.com/howto/manual/nagios_send_host_mail.htm
http://nagios.fm4dd.com/howto/manual/pnp4n_send_service_mail.htm


One More Option

https://exchange.nagios.org/directory/Addons/Notifications/Send-HTML-Alert-Email-v2/details

Script to find out OS version details of a unix machine

http://linuxmafia.com/faq/Admin/release-files.html