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mars 27, 2017 Christophe Casalegno 4 commentaires

Mysql : how to purge binary logs when you have no space left on device ?

When you need to purge binary logs on a MySQL server, you just need to connect to your server and use the PURGE BINARY LOGS command like this : For example : Will purge all the binary logs before the date. Other method is to purge log file on « name » attribute of the log file. …

décembre 2, 2016 Christophe Casalegno Aucun commentaire

LXC : a new vulnerability ? No just a display bug !

Sometimes you discovering a vulnerability when you don’t search for and sometimes finally like this, it’s simply a false alert. More than 70 percents of vulnerabilities I’ve found in my life have no rapport with a security research, but simply due to chance, when doing administrator tasks for example. This day, I decide for …

novembre 13, 2016 Christophe Casalegno Aucun commentaire

Bash : how to simply check disk space on linux and take action when a threshold is reached

Hi all, after showing you how to simply check load average or memory usage on linux, today i’ll simply show you how to check disk space and take action if a threshold is reached. We’ll simply use df, grep, awk, cut and if/then to do this : Just put it in your crontab and you’ll …

novembre 6, 2016 Christophe Casalegno Un commentaire

How to simply check free memory and take action when a threshold is reached

In your admin work it can be useful to check free memory and take action on threshold. The most tools don’t show you a realistic state of your memory. For example if you launch « top » command on a server, you’ll obtain an information like this : If you use the « free » command, you’ll obtain the …

novembre 6, 2016 Christophe Casalegno Aucun commentaire

Under WordPress « Pingback » DDoS Attack ? Use iptables

WordPress « Pingback » DDoS attacks can generate a lot of requests to your website that can affect performances and availability. Â You can recognize easily this attacks : you just need to do a tail -f Â on your logs and you’ll probably see thousand of request that have a User-Agent « WordPress xxxx » on it. I don’t think …

juillet 8, 2016 Christophe Casalegno Aucun commentaire

How to quickly remove a lot of dns zones from bind ?

When you work for a MSP, a hosting company or a cloud operator, sometimes you need to delete a lot of dns zone in one time. If you need to delete 1500 zones with your hand and you keyboard, you ‘ll need week to do the job. So let me show you how you can …

mars 1, 2016 Christophe Casalegno 2 commentaires

Automatic bind 9 installer with chroot Debian 8

Hi all, install bind 9 on debian 8 and chroot it isn’t a complicated task. But that’s steal a precious time for doing something else. So this is just a tiny post to simplify you this way First Step : install Debian 8 Second step : Third step : just use wget to download the …

juillet 26, 2015 Christophe Casalegno Aucun commentaire

Serial DNS Updater : how to update automatically serial in dns zonefiles massively (or not)

When you work in a hosting company, DN is probably one of the services with you need to interact every week. With this script you can update automatically one or more of dns zone files : for the serial number : just let bash doing it for u. Because most of time we are not …

juillet 14, 2015 Christophe Casalegno Un commentaire

How to automatically take an action if the load average is too high

When you manage servers, it can be useful to take a numbers of action automatically (restart a service, add a firewall rules, kill a process, sending an alert, etc.) if the load average is too high. The problem of a lot of shell script about this, it’s if the load average down slowly after the …

juillet 14, 2015 Christophe Casalegno Aucun commentaire

How to install webmin on debian 8

Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage a system from the console or remotely. To install webmin on debian …

février 4, 2015 Christophe Casalegno Aucun commentaire

Vulnerability GHOST : patches for Mandriva 2010.2 & Mageia3

Hi all, you can find here my 2 patches against the GHOST vulnerability for Mandriva 2010.2 Linux distribution and Mageia 3. 1) The first patch is for Mandriva 2010 Â and i want to thanks Moncef Limam Â AET (http://aet.com.tn) forÂ his help. 2) The second patch is for Mageia3 Linux To install the patch :Â 1) download …

octobre 10, 2014 Christophe Casalegno Aucun commentaire

shellshock another patch for old linux distributions…

Another new version of patched bash version against shellshock for out of date linux distribution. This patch works with success on Mandriva 2008 to 2010.2, OpenSUSE 12.1 Asparagus 64 bits & Red Hat Enterprise Linux Server release 5.2 (Tikanga). I’ve also put a corrected version for OVH Release 2 64 bits linux distribution To install …