A while back I needed a warning system for when my backups disk runs out of free space.
Gathering information from various other existing scripts, I wrote a small Perl script that check the available space and send warning emails if it drops below a defined level.
Rsync is a very handy tool at synchronizing the contents of two folders/directories.
And while being great for local folders, it also works remotely, via SSH, thanks to the -e ssh parameter: # rsync -ave ssh sourceserver:/home/user/ /home/user will sync /home/user from the sourceserver with /home/user on the local machine.
By default ls does not display hidden files (files with names starting with a dot).
To list hidden files, ls requires the usage of the -A parameter; for example ls -lA. To list only hidden (dotted) files, use this instead: ls -l .??*
When replacing a failed RAID1 member from the array, setting up the replacement disk requires to partition it exactly as the existing disk. But this takes time to do manually…
Fortunately, sfdisk comes in handy by providing a very fast shortcut…
A friend of mine was wondering about using a Raspberry PI as a NAS, the question being: how fast is the PI at file transfers from/to an external hard disk connected via a USB rack.
So I booted up my PI, mounted some random 3.5 inch Samsung 160GB SATA hard drive inside another random Spire USB-SATA external (powered) rack and gave it a go at some testing.
If you’ve done the SD card mod on WRT54GL, you might at some point change it with a bigger / faster card. You could just replace the SD card with a bigger one, but then you’d have to install/re-configure everything set up on it (like Optware stuff). […]
One may want to see the disk space used by each item (be it subdirectory or file) in a directory in a Linux environment. There are several ways to do that:
for f in `ls`; do du -hs $f; done
This works in most cases but has the minus that it fails if any of the items have spaces in their names. A workaround…
At points one may need to quickly check and see who is connected to a server – and in case of servers running services such as http, ftp (so on) the number of their connections.
The netstat program does indeed display the list of connections, but browsing through it when there is a large number of connections is rather difficult.
The dd command doesn’t include any kind of output on its operations. So if you’d like to run a lengthy dd operation and monitor its status, you’ll have to resort to a trick.
Running killall -USR1 dd will make dd to output it’s current status…
I couldn’t resist not trying out my RaspberryPI which I received yesterday 🙂
I quickly recycled one of my SD cards, installed the recommended SD image and booted it up.
After the initial boot setup screen (and partition resize), you can see it running connected to a monitor via HDMI, with a keyboard, mouse and wireless adapter (Asus WL-167g) all plugged in a 4-port USB hub…
Yay! After around 4 months of waiting, it is finally here. My very own Raspberry PI 🙂
It appears I received a rev2 board which, among other small improvements, should feature 512MB of RAM instead of 256.
The board comes packed in a nice neat pink(?!) case, together with a quick start guide giving you the essential information on how to get the thing started…
I decided to rearrange space a bit on the new CentOS server I am setting up…
This tutorial lists the steps I took to resize (grow) a functional RAID1 volume to a new size without losing data.
