I just started to install an Ubuntu 13.10 KVM guest – however the build process failed. The command that I was using was: However, I got this error message: Basically, you just need ensure the the linux-image-generic package (i.e. a kernel which supports non-PAE CPU’s) is installed by setting the addpkg flag like so: I … Read more
DebugChannel.com is a great new service / downloadable server to help debug your web application. The key things are that it speeds up debugging because all your debug output can be clearly formatted and shown in the same place. So you can get debug information from php scripts or even apache error logs. This post … Read more
If the root user is getting mail on your server (for example from cron scripts) then it can really helpful to forward it to an external email address. There are two ways of doing this: 1) The easiest and quickest way is to make a file in the folder called /root/.forward and place your email … Read more
You can batch rename files in Ubuntu using the “rename” command. It should be installed by default – so no need to apt-get install. The command is quite simple: For example renaming: google_marker_green.png google_marker_blue.png etc… To: map_marker_green.png map_market_blue.png etc… Hope this helps someone.
Just going through the process of making an Ubuntu server PCI compliant and found this really nice post about how to secure an Ubuntu server. http://www.thefanclub.co.za/how-to/how-secure-ubuntu-1204-lts-server-part-1-basics
I generally setup binary logs on a MySQL server where the data isn’t being replicated and I’m using daily mysql-dumps to backup the data. This allows me to recover the database to a specific point in time. However sometimes the binary logs can become very large if there are lots of changes occuring to the … Read more
When you are trying to analyse disk usage there are a limited set of command line tools on Linux. Most people use either of ‘find’ or ‘du’. However using these tools it can be a lot of work to get an overall picture and drill down into directories to find the problems. Enter ncdu (short … Read more
If you have a wildcard certificate (for example *.randomhacks.co.uk) you might need to install it on multiple servers which host the different subdomains. Basically, don’t rekey the certificate for each server just copy the same keys and certificate files across all the servers. If you rekey the certificate each time then you will invalidate any … Read more
I’ve just installed an Ubuntu apt-cache server on our local network to speed up downloading packages each time we install or upgrade an Ubuntu computer. However, changing all the /etc/apt/sources.list file for every computer in the office is a real pain. Here is a simple command using sed which does this automatically for you: The … Read more
I usually make the hard drives on my virtual machines as small as possible to save disk space on the host. I do this because it is reasonably easy to resize them at a later date (especially if you using LVM). Anyhow here is a quick guide to resizing a qcow2 disk image. 1 – … Read more