WordPress performance tuning

Posted on 2013-11-27 by Gerhard

While migrating from one server to a Amazon AWS i noticed a huge decrease in performance on the AWS instance. While the Wordpress blog took a second or so to load on the old server (dedicated server) the processing time went up to about 5-10 seconds for one page load. At first you might immediately think of the server as the bottle neck. But a slow server will just bring the problem to light. Continue reading →

Posted in PHP, Wordpress | Tagged , , , , | Comments Off on WordPress performance tuning

Network Interface order with Proxmox

Posted on 2013-11-11 by Gerhard

When you create a Proxmox virtual machine (KVM), the network interfaces may not always be in the order you want them to be. The order of the network interfaces is not only defined by an order in Proxmox. It is … Continue reading →

Posted in Linux Administration, Virtualisation | Tagged , , , | Comments Off on Network Interface order with Proxmox

Restrict Linux User to SCP to his home directory

Posted on 2013-10-28 by Gerhard

You wanna give access to your server? But you want to restrict access to SCP/SFTP and to the user’s home directory. Here is how i configured an account restricted to SCP/SFTP only using jailkit on CentOS. Continue reading →

Posted in Linux Administration, Security | Tagged , , , , , | Comments Off on Restrict Linux User to SCP to his home directory

Create bootable USB stick from ISO in Mac OS X

Posted on 2013-10-05 by Gerhard

Booting from a USB stick is nowadays more and more important. More and more PC’s as well as servers are delivered per default without a CD/DVD drive. To install the OS of your choice, USB sticks provide you the easiest possibility. But how to get the ISO image to the USB stick? Continue reading →

Posted in MacOSX | Tagged , , , , , | 2 Comments

Merge two SVN repositories

Posted on 2013-09-19 by Gerhard

There was a point in time when i created a copy of a project and it was then committed into another repository. This as such is not a big problem, but merging those repositories back together while keeping all the complete changes in the history is a challenge. Continue reading →

Posted in Version control system | Tagged , , , | Comments Off on Merge two SVN repositories

Subversion via ssh using authorized_keys

Posted on 2013-09-04 by Gerhard

When i used subversion in the past i created a separate user on the linux operating system. This user then got the right to login via ssh to use subversion. If you have one or two users to manage that is not a big deal. But when the amount of users is growing … Continue reading →

Posted in Linux Administration, Security, Version control system | Tagged , , , | Comments Off on Subversion via ssh using authorized_keys

SSH remote host identification has changed

Posted on 2013-08-16 by Gerhard

You might know the situation when you try to login to a server via ssh and instead of the console you get the “REMOTE HOST IDENTIFICATION HAS CHANGED” Warning. Here is how to deal with it. Continue reading →

Posted in Linux Administration, Security | Tagged | Comments Off on SSH remote host identification has changed

Review: Use your Mac as bluetooth iPad keyboard

Posted on 2013-07-25 by Gerhard

There are several ways i know to use a real keyboard to enter text on you mobile device. You can use a bluetooth keyboard or use your Mac’s keyboard as a bluetooth keyboard. I had the chance to test 2 great applications to turn your Mac into a bluetooth keyboard. Continue reading →

Posted in MacOSX, Review | Tagged , , , , , | 1 Comment

The NSA and HTTPS facebook privacy

Posted on 2013-06-20 by Gerhard

It seems to be a big discussion about US government agencies, like the NSA, accessing user data from Google and Facebook. As of this i got asked how that can be a problem as the HTTPS is secure anyway. I would like to explain here what the difference is between HTTPS and privacy! … Continue reading →

Posted in Security | Tagged , , , | Comments Off on The NSA and HTTPS facebook privacy