Howto use the hetzner backup space with rsync

This post describes how to overcome the hetzner backup space restriction of not being able to set linux uid / gids and so on on the (sshfs) mounted backup space. It does not describe how to do incremental backups using rsync and hardlinks.

1. The problem
The www.hetzner.de backup space does not allow for rsync to change […]

By |November 26th, 2014|Admins knowledge, Hosting, www.hetzner.de|Comments Off on Howto use the hetzner backup space with rsync

Website unter heavy load from IP.unknown.SteepHost.Net

I recently had a customer who experienced high network throughput on one of his machines. He noticed by receiving multiple traffic warnings from the hetzner monitoring system, which monitors in and outgoing network traffic and sends emails when a total defined limit is exceeded. If you are with hetzner.de, I highly recommend using this.

A great […]

By |September 16th, 2014|Admins knowledge, Networking, Uncategorized, Webserver|Comments Off on Website unter heavy load from IP.unknown.SteepHost.Net

Using a reverse SSH Tunnel to access Machines behind a NAT or Firewall

When the machine that needs to be accessed by SSH is located behind a NAT router or a firewall that allows only connections that have been established by the internal machine, an SSH Tunnel is a simple way to accomplish that. It creates an outbound connection to a public server, through which SSH access can […]

By |September 9th, 2014|Admins knowledge, Uncategorized|Comments Off on Using a reverse SSH Tunnel to access Machines behind a NAT or Firewall

Renaming a virtual machine domain with virsh

There is no API to accomplish renaming a domain using virsh. The well known graphical tool `virt-manager` therefore also does not offer the possibility to rename a libvirt domain. In order to do that, you have to stop the virtual machine and edit the .xml data like follows:
root@host ~ # virsh dumpxml machine.example.com > machine.xml
root@host […]

By |September 8th, 2014|Admins knowledge|Comments Off on Renaming a virtual machine domain with virsh

Remove old Kernels from full /boot partition

When the /boot partition is full, it might not be possible anymore to remove old kernel versions by just using apt. A full /boot partition can lead to problems during boot as well. In this case, the following error might be shown during apt operations that trigger an `update-initramfs`:
gzip: stdout: No space left on device
E: […]

By |September 8th, 2014|Admins knowledge, Uncategorized|Comments Off on Remove old Kernels from full /boot partition