bup - Very efficient backup system based on the git packfile format, providing fast incremental saves and global deduplication (among and within files, including virtual machine images).

Sophos Virus-Scan for Linux is now free(even for servers). https://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-linux.aspx

Sometimes it’s nice to have an auto-incrementing value in our database so that we don’t have to generate a unique id(for example). In postgresql we can achieve this using sequences:

CREATE SEQUENCE key_seq;
CREATE TABLE sometable (
    key_id INTEGER NOT NULL DEFAULT nextval('key_seq')
);
ALTER SEQUENCE key_seq OWNED BY sometable.key_id;

Postgresql is a pretty cool database and it even has functions for encryption.  So if you write a user-database, you don’t need to use crypto-functions from your programming language to encrypt your password. You can directly use postgresql-functions!

Due to security issues nrpe-server in Debian Jessie is now compiled without “–enable-command-args”. If you want to use it you have to recompile it.

I know that nobody should use Microsoft Exchange 2003 anymore. But there are still some 2003s out there. I wanted to create a reverse-proxy for such an exchange-server on linux to have at least a better encryption, when some problems appeared:

Some Systems lock up the system while transferring large files via CIFS. I have a linux system which tries to backup to a NAS. Today it just hanged. The backup-file(very large) was not accessible anymore and I wasn’t able to delete the file. Therefore even the backup-service just hanged. In the syslog I found lines like:

Towel Day is celebrated every year on 25 May as atributeto the authorDouglas Adamsby his fans.^[1]On this day, fans carry atowelwith them,as described in Adams’The Hitchhiker’s Guide to the Galaxy, to demonstrate their appreciation for the books and the author. The commemoration was first held two weeks after Adams’ death on 11 May 2001

There are several weaknesses in how Diffie-Hellman key exchange are deployed. This weaknesses have a huge impact, since many servers are affected. Here are some advices how to setup a prober key exchange on serveral servers.

I created a LED-Cube. It was a lot of fun to make it. I used very cheap LEDs, therefore it’s not perfect. But it is good enough to programm some nice effects. I used an arduino to controll the cube. It was interesting to play with bit-shift-registers and it was cool to programm more with bit-operations. The soldering was hell, but it was worthy

PS: yeah, I know..my cam makes lousy videos…