If you install XenServer on a dedicated server from www.ovh.ie it comes with two NICs defined. NIC1 is the “normal” bridge network that has the server public/management IP address. IF you want to add “normal” IPs that you’ve purchased then the normal OVH guides are very good. However, it’s not particularly clear how to add … [Read more…]
In the previous versions of this script you’ve had to leave the backup user password in the script, however MySQL 5.5 and above come with mysql_config_editor which allows you to store connection details in an ancryptedl file (~/.mylogin.cnf) which mysql/mysqldump/mysqladmin can use with the “–login-path=” option. For basic usage run the following, the –password prompts … [Read more…]
With thanks to this guide: Increasing File Descriptors and Open Files Limit CentOS 7
At the grub prompt, edit the line for the specific kernel and at the end of the line add: video=800×600-24 for 800 x 600 resolution with 24 bit colour. To make this permanent: Edit /etc/default/grub and add the video= to the end of GRUB_CMDLINE_LINUX line. # grub2-mkconfig -o /boot/grub2/grub.cfg This will force the video mode … [Read more…]
This is an update to the earlier MySQL backup script, with this version I’ve added the code that (assuming your backup user has sufficient rights) allows the script to get a list of all the databases on the server, exclude the MySQL internal ones and use this as the list of databases to backup. This … [Read more…]
There are times when you’ll want to limit access and block whole countries. Why? Because there are times when it’s necessary. Here’s a script that builds a script…. It downloads the IP ranges from www.ipdeny.com, works through a list of two letter country codes to create a bash script that will: Delete an existing iptables … [Read more…]
So you’ve decided that you don’t want to support Microsoft (although you’re happy to support whatever company MADE your computer… go figure!) and want to ditch Windows. As a general rule, Linux assumes that you are willing to document yourself: the more you do, the more freedom and benefits you will have. Of course Linux … [Read more…]
Windows has a number of reserved characters that aren’t allowed in file/folder names: ◦The following reserved characters: ◾< (less than) ◾> (greater than) ◾: (colon) ◾” (double quote) ◾/ (forward slash) ◾\ (backslash) ◾| (vertical bar or pipe) ◾? (question mark) ◾* (asterisk) I’d also advise against the use of curly braces {} The following … [Read more…]
Many thanks to “Gavin Smith” on stackoverflow.com for the first part of this tip. Expressions like ${${a}} do not work. To work around it, you can use eval: b=value a=b eval aval=\$$a echo $aval Output is value Thanks for the tip Gavin! Ok, so why would you want to? For me, I needed to test … [Read more…]
Problem You’ve users that you want to ban / block from your web servers using Fail2Ban but your web servers are behind a proxy so all traffic appears to be coming from the proxy server IP/Interface. Ideally you should have learning rules on your proxy or load balancer where you can automatically filter/rate/take actions, but … [Read more…]