Christoffer Kjølbæk I have a blog, therefore I am…

7Oct/102

Howto resize a lot of images

If you have a lot of images and want them all resized, use mogrify from ImageMagick

Say you want all images to be 1000 pixels wide, simply do

mogrify -resize 1000 *.jpg

If you want all images to be max 100x100 pixels, and keep the aspect ratio do

mogrify -resize 100x100 *.jpg

If you want to force the image to be 100x100 pixels do

mogrify -resize 100x100! *.jpg

Read more at http://www.imagemagick.org/script/mogrify.php

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14Aug/100

Using UUID for USB harddrives in fstab

If you use a number of USB hard drives attached to a server (or desktop), you will notice that they (can) come up with different device names after each reboot. Because of the different names, it is difficult to use the names in /etc/fstab. To avoid this problem, it is possible to use UUID instead, which is an unique id number for each partition.

If you fstab line for the USB disk looks like

/dev/sdc2 /nas/data ext3 errors=remount-ro 0 1

You should get the UUID of /dev/sdc2 by running

blkid /dev/sdb2

Which gives something like

/dev/sdb2: LABEL="maxtor_b_data" UUID="b7a042b2-60c6-4116-8324-065a3d23520d" TYPE="ext3"

Change the fstab line to

UUID=b7a042b2-60c6-4116-8324-065a3d23520d /nas/data ext3 errors=remount-ro 0 1

And you are ready to go :)

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21Feb/100

Cleaning up /boot by removing unused kernels (Ubuntu)

At some point /boot will be full of old kernels (if /boot is a separate partition), which makes it impossible to make a dist-upgrade and it is therefore necessary to remove some old kernels.

Start by finding you current kernel

uname -r

which will give something like

2.6.24-25-server

Now, find all installed kernels

aptitude search linux|grep linux-image | grep "i   "

which will give something like

i linux-image-2.6.24-12-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-14-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-15-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-16-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-17-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-18-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-19-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-21-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-22-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-23-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-24-server - Linux kernel image for version 2.6.24 on x
i linux-image-2.6.24-25-server - Linux kernel image for version 2.6.24 on x
i linux-image-server - Linux kernel image on Server Equipment.

Purge all of these, except the one found with uname -r and linux-image-server, which is a meta package

sudo apt-get purge linux-image-2.6.24-14-server linux-image-2.6.24-15-server linux-image-2.6.24-16-server linux-image-2.6.24-17-server linux-image-2.6.24-18-server linux-image-2.6.24-19-server linux-image-2.6.24-21-server linux-image-2.6.24-22-server linux-image-2.6.24-23-server linux-image-2.6.24-24-server

The above freed 250 MB from /boot and 550 MB from / at my system.

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