Category: Administration / Server

19.05.2017

yeah i know i sometimes make fun of distributions that have like a partition for every /root/folder but well yes it has it’s reasons. suse12 uname -a; # tested with Linux suse 4.4.21-69-default #1 SMP Tue Oct 25 10:58:20 UTC […]

16.05.2017

this article might be largely incomplete… kernel ringbuffer boot messages messages from the kernel during first stages of boot. # all distros dmesg; # show kernel ring buffer boot messages log # Centos7 only (debian8 has the file but it […]

15.05.2017

the commands used for xfs are different. this is only valid for ext3/ext4. preparation: you should move your /home to a separate partition. Warning! You will need to have „physical“ access to the server’s console in order to perform these […]

15.05.2017

I believe filesystems come with different concepts – maturity – features – and it is almost like with the distributions – you basically need to know – what you need in order to make the right choice. But if you […]

14.05.2017

ps -eo size,pid,user,command –sort -size | awk ‚{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }’| head -10    1243.09 Mb /usr/sbin/mysqld –basedir=/usr –datadir=/var/lib/mysql –plugin-dir=/usr/lib/mysql/plugin –user=mysql […]

13.05.2017

Ransomware hitting a new dimension – with the NSA-backdoors pre-installed in a lot of soft and hardware (check out Intel AMT/ME disaster) – hackers/attackers are trying to find and exploit those in order to make some profit. Millions of € […]

12.05.2017

you can boot a knoppix to perform those benchmarks… BUT DO NOT BOOT KNOPPIX ON SYSTEMS WITH NTFS AND LSI RAID ADAPTERS!!! (you might lose your partition table) harddisk benchmarks Benchmark Linux System cpu apt-get install sysbench sysbench –test=cpu –cpu-max-prime=20000 […]

11.05.2017

one sunny day on Debian8.7 as a result of this action: dwaves.de/2017/05/10/linux-sftp-ssh-how-to-limit-users-to-their-home-directories/ i got the stated error message: /usr/bin/xauth:  timeout in locking authority file /home/user/.Xauthority root@debian:/home/user# ls -lah|grep ICE -rwxrwxrwx  1 user user 4.7K May 10 16:25 .ICEauthority # chmod […]

04.05.2017

Centos5 documentation: (Centos7 does not have it installed per default can be installed like this: yum install xinetd*) To control access to Internet services, use xinetd, which is a secure replacement for inetd. The xinetd daemon conserves system resources, provides […]

04.05.2017

DO NOT SEND YOUR PASSWORT WITH TELNET! people might capture those unencrypted passwords on backbone-level… the NSA is the largest state-sponsored hacking organization on this planet. with telnet you can test what service and even it’s version number is running […]

10.02.2017

This is a basic but yet very powerful way to stress-test your site. WordPress, Blogspot but also TYPO3 without HipHop and PHP7 (check out this benchmark) seem to be quiet good targets for this attack. I basically managed to bring […]

Was macht eigentlich ORACLE?
28.01.2017

Jeder kennt Steve Jobs (now dead) – aber wer kennt schon „Larry“ Ellison? 😀 Oracle hat 2010 die Firma „Sun Microsystem aufgekauft“ und damit OpenSource Technologie wie Java, VirtualBox und MySQL eingekauft. Lawrence Joseph „Larry“ Ellison (born August 17, 1944) […]

16.06.2015

uname -a Linux debian 3.16.0-4-686-pae #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) i686 GNU/Linux # -n = show numeric ip addresses, do not try to resolve dns-names of hosts lsof -i -P -n; # list all open ports and listening services/programs COMMAND […]