Here are some postfix queue management commands that I find myself using regularly (on an Ubuntu server):
Fresh install of Ubuntu Server 12.04 LTS: After installed SSHD, I found that logging in remotely was a time-consuming process as the password prompt took ages to pop up after the username prompt. Binging about, I found that this was due to SSHD performing a reverse DNS lookup of my IP to potentially check if all is kosher. Turning this check off fixes the issue:
All those who SSH into servers ought to use GNU Screen. The following is some additional configuration that can be added to a
.screenrc file in your home directory. These lines do wonders to the usability of the system:
Installing Aegir 2 on a fresh install of Ubuntu Saucy in a Virtualbox, I ran into the following message:
The drush command '@hostmaster pm-enable hosting_queued' could not be found.
To fix this run,
sudo mysql_secure_installation and ensure that you remove anonymous users. This should do the trick.
Using Virtualbox (4.3.6) on an XP64 machine, I ran into the following error while trying to install a 64-bit version of Ubuntu:
this kernel requires an x86-64 CPU, but only detects an i686 CPU, unable to boot
This happens even if the host machine is a 64-bit machine. To fix this, reboot the box and enter the BIOS. Look around for a virtualisation setting and enable it. Save and exit the BIOS configuration screen.
I recently had trouble with a MySQL installation in Ubuntu. For some reason or the other, during an upgrade to a newer version of mysql-server, the upgrade script had issues stopping the server and the script failed. This meant that
apt could no longer function as it kept raising a red flag over the broken upgrade with the following instructions:
I ran into a hitch while trying to install the latest version of TortoiseSVN on my XP 64-bit Windows installation. Apparently, the entire world has forgotten about the existence of this variety of Windows. There's absolutely no mention of it anywhere on TortoiseSVN's installer page. The MSI installer failed stating that the version of Windows Installer that I was using was dated and that I needed to update my version of XP (x86) to SP3 or some other drivel like that. TortoiseSVN has no manual install option either. I did the whole Windows Update thing as well, to no avail.
I'm trying to VNC into my Kubuntu box using Jump Desktop from my Android tablet. All works well and everything is quite peachy. Everything that is, except for typing with the keyboard. Typing anything results in letters being displayed in capitals. Using the SHIFT key in the Android keyboard does fuck all. However, when I connected a keyboard to the Kubuntu box and pressed the CAPS LOCK key, my Android keyboard started typing in smalls.
Just now while attempting to perform a substitution in GVim, I found that the regex was not working as expected. Apparently, instead of matching all non-whitespace characters denoted by the shorthand class
\S, the engine was matching the letter S instead, which was odd. It turns out that, as usual, I was the one at fault. What I was doing wrong was attempting to use the character class within
Earlier today, I had to perform a substitution in Gvim within a 2GB file. Unfortunately, after a few thousand operations, Vim ran out of memory with the following error:
Out of memory!
Out of memory! (allocating XXX bytes)
Windows too complained about running out of virtual memory and my system slowed down to treacle-like response times.