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Getting a list of all installed packages using aptitude

Submitted by Druss on Mon, 2011-05-09 22:20

Earlier today, I noticed - in htop - that a particular process, let's say 'foo-123', was running even though I had removed the package 'foo' many days earlier. I tried removing it again and found that I was right and that the package had already been removed. The package dependency list was way too long for me to go removing them one by one, or parsing them out and removing the lot.

Setting up a Bind 9 DNS server in Debian/Ubuntu

Submitted by Druss on Tue, 2011-05-03 11:46

The Internet will go bust without DNS and the following is a guide to setting up your own DNS server to provide information about your domains and associated services. While this task can be accomplished very easily when using a hosting control panel, it is great fun to set things up on your own.

Installing htop (on CentOS or any other distro)

Submitted by Druss on Fri, 2011-04-29 19:18

Unlike Top, its newer sibling - Htop is better in every way. It provides more detailed information, supports colours and is more configurable. Htop is available in the repositories of most distros. However, CentOS (and therefore, RHEL) is not one of them. While it it apparently available in the EPEL repositories, I could not find it for CentOS 4.9. In any event, what we have below are the (simple) steps to install it from the source packages:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Submitted by Druss on Fri, 2011-04-22 09:56

I installed MySQL on my local server today and when I went to access it via mysql_secure_installation to set my root password etc., I ran into the following curious error:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

CentOS: warning: ius-release-1.0-6.ius.el5.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 9cd4953f

Submitted by Druss on Wed, 2011-04-20 23:42

I ran into the following warning while trying to install a package from the IUS third-party repository for CentOS:
warning: ius-release-1.0-6.ius.el5.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 9cd4953f.

File renaming using sed and xargs: Prefixing all filenames with a 0 from the commandline

Submitted by Druss on Tue, 2011-01-25 00:56

Earlier today, I wanted to prefix a number of image files on a server with a 0. If this was on my desktop, I would have simply used a graphical tool such as the excellent Métamorphose. However, in this case, only a command-line was available. While Google threw up a number of bash scripts, I was curious to see if this could be done in a cleaner and more concise manner. Following the excellent reference to sed and more Google magicking, I arrived at

Configuring Samba share on Lucid

Submitted by Druss on Wed, 2010-05-05 00:00

I performed a fresh install of Kubuntu's new distro - Lucid whatever - today. As per usual, there is no front-end to configure Samba and I had to do it the old-fashioned way. The following are steps that should walk you through a basic configuration on creating a share that can be accessed from Windows:

  1. Install Samba using sudo aptitude install samba smbfs
  2. Navigate to /etc/samba/

apache2: bad user name ${APACHE_RUN_USER}

Submitted by Druss on Thu, 2010-02-04 03:06

While trying to check the vhost configuration on my Kubuntu dev box, I had to run httpd -S. Of course, since ubuntu renamed httpd to apache (a bit like calling a Veyron a Bugatti), I had to run apache2 -S. This however led to the following error message:
apache2: bad user name ${APACHE_RUN_USER}

console-kit-daemon running amok in htop

Submitted by Druss on Tue, 2009-11-10 01:24

If you, like I was, are alarmed at the number of console-kit-daemon-s being listed by htop, calm yourself. It is a misrepresentation of threads as separate processes. To get a better view of what's going on, select "Setup" in htop and under "Display options", check the "Tree view" and "Display threads in a different colour" boxes and save the changes.

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