You might have to remove an existing GPT partition table from a hard disk when you install another OS like Windows which can't cope with GPT or like in my case, when you want to add an HDD into a RAID were the other disks use the traditional MBR partition table.
Continue reading How to remove a GPT partition table from HDD
High page speed and short page load times of your website are essential for good search engine rankings today. In this FAQ, I will show you how to enable caching of graphic and CSS files in apache on Ubuntu and Debian.
The first step is to enable the expires module in apache:
a2enmod headers expires
This module allows the apache web server to set HTTP headers, in this case, to set the modification header for static assets like image and CSS files that don't change often.
Add the following config snippet inside the vhost file of the web site or at the end of the file /etc/apache2/apache2.conf to enable it globally.
Header set Cache-Control "max-age=3024000, public"
Finally reload apache to apply the configuration change.
service apache2 reload
On ISPConfig 3 servers, the snippet can be added in the "Apache Directives" field of the website instead. There is no apache reload required as ISPConfig takes care about that.
Today I will outline the options to kill an unresponsive OpenVZ container.
Continue reading How to kill an OpenVZ Container?
Jailkit is an easy to use tool to create and maintain jail environments for shell users on Linux. In this guide, I will show you how to move PHP and its dependencies into the jail so that the jailed user can execute PHP scripts inside the jail.
Continue reading How to add PHP support for jailed SSH users in ISPConfig 3
Sometimes you might want to download an entire website e.g. to archive it or read it offline. This tutorial will show you which application can be used on Windows and Linux.
Continue reading How can I download an entire website?
The bash history is a log file that contains all commands that the user executed on the Linux shell. When you use the "arrow up" key on our keyboard, then Bash will look up the previous command from that file and display it on the screen, ready to be executed again.
Continue reading How to clear Bash history on Linux?
Here are the steps that need to be taken to change the ID of an OpenVZ Container. OpenVZ is a virtualization technology for Linux.
Continue reading How to change the ID of an OpenVZ Container
OpenVZ is a Linux based Kernel virtualization technology developed by SWSoft for its commercial product Virtuozzo. The modified Linux Kernel and the system utilities are released under an OpenSource license. Vzdump is a shell based backup program for OpenVZ virtual machines. It is made for containers that use the traditional "simfs" filesystem, it can not be used for containers with "ploop" filesystem.
Continue reading How to Backup OpenVZ Containers with vzdump on CentOS 6
Centos 7 replaced the traditional IPTables Linux Kernel Firewall with the Firewalld service. There are still a lot of scripts available that require the use of IPTables. A common example is the software Fail2ban.
In this guide, I will explain the installation of IPTables on Centos 7.x
The first step is to stop and mask the firewalld service:
systemctl stop firewalld
systemctl mask firewalld
Then install the "iptables-services" package with the yum package installer:
yum install iptables-services
And enable the new service:
systemctl enable iptables
IPTables is now ready to be used on your server. For example you can block an external IP address now with the iptables command:
iptables -A INPUT -s 192.168.0.10 -j DROP
Rules that you set with iptables persist only until the next reboot. To save them permanently use the following command:
service iptables save
Sometimes it is necessary to limit the download rate of the wget command, e.g. when you are downloading a large file over a slow internet connection. The parameter to apply a download speed limit is the --limit-rate option. This setting is followed by the rate limit plus "k" for Kbit or "m" for MBit.
wget --limit-rate 128k http://downloadserver.tld/bigfile.zip