The Hierarchical Token Bucket Quality of Service (HTB QoS) system is a great tool to use for controlling the bandwidth of a network link, especially when you have a bunch of doggs on your network that love to use up all the internets they can get! Lets take a look at a quick and simple […]
Blocking Services with Fail2Ban
There are many different methods of securing a publicly accessible server, and one of the best things a system administrator can do is use fail2ban to dynamically block potential attackers before they can do any damage.
Setting up an IPv6 Tunnel
So, you want to access IPv6 websites, but your ISP does not provide native IPv6 access? Well, here are some instructions for setting up a 6in4 IPv6 tunnel with Hurricane Electric!
Installing PS3 Media Server on CentOS 6
So after recently rebuilding one of the servers in my dogghouse, I realized that I hadn’t installed a uPNP/DLNA AV media server. Previously I had been using Fuppes, but the lack of active development and some other quirks made me re-think what I wanted to use. So, after comparing available packages, I decided to give […]
Radvd and DHCPd6 Server Configuration fo...
I’ve been using radvd for a while now to hand out IPv6 addresses to all the different devices in my Dogghouse, and I thought that it would be nice to have a working dynamic DNS setup for IPv6, in the same way as I have DDNS for IPv4.
KVM Clocks and Time Zone Settings
So the other day there was an extended power outage down at the dogg pound, and one of my non-essential server racks had to be taken off-line. This particular server rack only has UPS battery backup, but no generator power (like the others), and upon reboot, the clocks in all my QEMU Linux VM’s were […]
Linux Server Send Email on Boot
It is always nice to have notification of when a server reboots, especially when you are on vacation, away from the office, or just lounging around! In order to send an email on reboot, we can easily create a cron job to run on reboot. Depending on your specific Linux distro, you may encounter some […]
Disabling SELinux
One of the first things I usually do with most of my servers is disable SELinux. Optimally, you should configure SELinux to allow the services you need, but instead you can just disable the whole darn thing!
Creating a new KVM server on a headless ...
One of the things any good sysadmin dogg wants to do is setup some virtual servers. Who wants to actually stand in front of a server to do that?! What if the machine is headless (no monitor attached)? Well, as long as we have SSH access to the machine, we can do everything from the […]
Lockd and Statd NFS Errors
The other day, the NFS clients at the pound stopped working correctly. Programs that use a NFS share for caching data or locking files (such as Firefox) stopped working without any explanation. My doggs were also unable to compile any programs, which led to a lot of barking and growling from all of them!