Category Linux

In case you have a screen with high resolutions, a 4k screen for example, it is possible that GRUB is incredibly slow. If that is the case, the workaround is to edit the /etc/default/grub file, and add/replace the following line…

This guide, coming from Google, explains how to use a dynamic IPsec VPN tunnel with strongSwan on Linux Step 1: Configure BIRD   # Config example for bird 1.6 #debug protocols all;router id 169.254.2.2;# Watch interface up/down eventsprotocol device…

In order to optimize all databases & tables within your mysql instance, you can use the code below. You can also use a more specific script, where only the tables are optimized which have 10MB free space and 10% free…

In SLES you can search & install specific CVE patches using the commands below.

If you do a df, and you compare those values with ‘du’, it is possible that those values don’t match. There are multiple reasons why this can happen, and one of those reasons if that files where deleted, but that…

You can use the following shell commands in order to redirect a port to another port.

Using the “stress” application, you can simulate high memory usage of your system.You may use the following command line:  

With ffmpeg you can also decrease the size (aka: quality) of a mp4 file on linux command line.You can use the following example, which will generate a +/- 5Mb file :

You can optimize Jpeg images on linux command line (= reduce the size to load images faster).In order to achieve that, you can make use of the ‘jpegoptim’ application.On ubuntu/debian systems:   To optimize the jpeg file:

Create a file ‘allowed-hosts’ in the ‘work_dir’ (can be found in the denyhosts.conf file), which is /var/lib/denyhosts on Ubuntu, containing the ip.See the example below:

Find IP Address to Unblock Log in to your server via SSH and type in the following command: iptables -L -n Look for the IP address you want to unblock / unban. Now we must find the jail name this…

First, edit the config file : vi Then, check the line : ignoreip = Add now add all ip you want. Each IP or range IP must be placed here with a space. Ex: 192.168.0.1 192.168.5.0/32 Save. And restart…

Within HAProxy it is possible to redirect all http traffic to https.It is sufficient to add the following rule within the frontend section:

Within HAProxy it is possible to redirect all http traffic to https.It is sufficient to add the following rule within the frontend section: frontend incoming80 bind 10.1.1.13:80 redirect scheme https if !{ ssl_fc }

If you configure HAProxy by default, the backends will receive the IP address of the HAProxy as incoming IP address. Some applications (or people) don’t want that. It is possible to configure haproxy as transparent proxy, so that the IP…

With the code below, you can set selinux to allow remote backends.

If you have a file system with a lot of small files, it it possible that you are running out of inodes.Unfortunately it is not possible to increase the number of inodes on the fly.In order achieve this, you will…

You can use the following mod_security rules for wordpress/joomla/drupal ## Rules for the CWP ## SecRuleRemoveById 910006SecRuleRemoveById 950000SecRuleRemoveById 950001SecRuleRemoveById 950005SecRuleRemoveById 950006SecRuleRemoveById 950117SecRuleRemoveById 950907SecRuleRemoveById 958039SecRuleRemoveById 958051SecRuleRemoveById 958291SecRuleRemoveById 959006SecRuleRemoveById 959151SecRuleRemoveById 960008SecRuleRemoveById 960010 SecRuleRemoveById 960011 SecRuleRemoveById 960012 SecRuleRemoveById 960035 SecRuleRemoveById 960335 SecRuleRemoveById 960904 SecRuleRemoveById 960915 SecRuleRemoveById 970003 SecRuleRemoveById 970015 SecRuleRemoveById 970903 SecRuleRemoveById 973301 SecRuleRemoveById…