Changing the default size of gnome-terminal

Whenever I start gnome-terminal, it opens to 80 columns x 24 rows.  That is too small for my taste.  Henceforth, I want it’s default size to be 80×50.  Install gconf-editor.

sudo apt-get install gconf-editor

Screenshot from 2013-02-19 00:05:02

Start gconf-editor.  In the window on the left, navigate to /apps/gnome-terminal/profiles/Default.  In the window on the right, set default_size_colums to 80 and set default_size_rows to 50.  Be sure to select use_custom_default_size.  You are done.  Close gconf-editor.  Start gnome-terminal and try out its new size.  (ctrl-alt-t, if you are using unity desktop)

Fixing postfix and saslauthd: cannot connect to saslauthd

If you are having issues getting postfix email server to authenticate with saslauthd, your solution might be found in a missing symlink.  Remember that postifx runs in a chroot environment.

I find the following warning message in /var/log/mail.log:

 warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory

The warning message tells me that saslauthd can’t be located. The real location is /var/spool/postfix/var/run/saslauthd, but postfix is expecting to find it in /var/run/saslauthd.  Create a symlink as described below and see if that fixes your problem.

sudo ln -s /var/spool/postfix/var/run/saslauthd /var/run
sudo chown root:sasl /var/spool/postfix/var/run/saslauthd
sudo usermod -a -G sasl postfix

Be sure to restart postfix and saslauthd.

sudo /etc/init.d/postfix restart
sudo /etc/init.d/saslauthd restart

After restarting saslauthd, you should see some of the following files in /var/spool/postfix/var/run/saslauthd:

cache.flock cache.mmap mux/ mux.accept

Test using your smtp client and verify that you no long receive the previous warning message in your mail.log file.  Hopefully this was your quick fix.