SATA vs. SSD
MySQL server with SATA disk vs. SSD disk.
Category Archives: Linux & Unix
Postfix reject_unknown_helo_hostname woes
Googling for some answers regarding why some mail-servers fail to identify themselves correctly, I found this amusing forum reply; Unfortunately, “reject_unknown_helo_hostname” is not acceptable to use, because too many Exchange Servers are configured to identify themselves with something that only appears in their local DNS. Apparently either Microsoft’s certification programs only produce people who can [...]
Bootable Software RAID-1 on running system
This is tested on Debian Squeeze, but should work on most Debian derived distributions and on other Linux distributions with small changes. I have written almost the same guide some years ago, but I wanted to add an extra disk to my QNAP NAS and decided to write it down again. Requirements; 2 identical disks [...]
Plesk 9.x to 10 migration – no IMAP subfolders – workaround
Had the “pleasure” of migrating a Plesk 9.5 Linux server to another running the brand new Plesk 10 panel. Apart from the new GUI interface in Plesk 10, the migration was fast and went smooth. Or so I thought. The first problem I noticed was missing .htaccess files. The other, more serious, problem was with [...]
Migrating IMAP mail accounts
If you need to move all your email from one server to another, an easy and quick way is by using imapsync. Below is a simple script which will ask for server names, credentials and run imapsync. This might not work for you, so please check the imapsync manual page for different options, and remember [...]
How to convert and burn a .dmg (Mac OSX) disk image on Linux
Today I wanted to burn a .dmg file, but I didn’t have an Apple computer available. So, running Linux I started to google for a solution, and found one. You need to download the dmg2img tool from http://vu1tur.eu.org/tools/, and then compile it. I had to install libbz2-dev and libssl-dev packages and of course the compiler [...]
No 64bit flash player for Linux
I’m not sure whether this is good or bad… but Adobe has removed it’s 64bit flash player for Linux (don’t know about other platforms). This means no flash-content for me, running Debian Squeeze amd64. The alternatives are .. none? The gnash player (which has a Mozilla plugin) is useless for everything but movies and will crash and hog [...]
LVM Extend HOWTO
Just a quick ‘howto extend an existing logical volume’ on a Linux box. You will of course start by adding a new disk to the server. If this can be done online, you will need to run scsiadd -s to scan for new devices. Verify that the new disk is seen by the system and [...]
Debian Squeeze network-manager offline problem
Today I replaced my Ubuntu 10.04 desktop with Debian Squeeze (frozen testing). Installation went smooth, beside two small problems. I could not select Danish locale. I had to select ‘C’ as locale, and later on select DK keyboard layout. I also ended up with two kernels installed. The first would not boot (called -trunk), but [...]
Use 3g USB modem for Internet connection with wvdial
My home dsl router broke yesterday, so I had to figure out how to get online again. Luckily I have my free-data 3g modem (from 3.dk), which works great from Ubuntu (network-manager). This is great for one computer at a time, but not for my entire home network. I searched and found exactly what I [...]