How To Install libapache2-mod-qos on Debian 9
Introduction
In this tutorial we learn how to install libapache2-mod-qos on Debian 9.
What is libapache2-mod-qos
libapache2-mod-qos is:
This is a quality of service module (QoS) for the Apache web server implementing control mechanisms that can provide different priority to different HTTP requests.
It may be used to determine which requests should be served and which shouldn’t in order to avoid resource oversubscription. The module collects different attributes such as the request URL, HTTP request and response headers, the IP source address, the HTTP response code, history data (user session and on per source IP address basis), the number of concurrent requests to the server (total or requests having similar attributes), the number of concurrent TCP connections (total or from a single source IP), and so forth.
Counteractive measures to enforce the defined rules are: request blocking, dynamic timeout adjustment, request delay, response throttling, and dropping of TCP connections.
There are three methods to install libapache2-mod-qos on Debian 9. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install libapache2-mod-qos Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install libapache2-mod-qos using apt-get by running the following command:
sudo apt-get -y install libapache2-mod-qos
Install libapache2-mod-qos Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install libapache2-mod-qos using apt by running the following command:
sudo apt -y install libapache2-mod-qos
Install libapache2-mod-qos Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Debian. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install libapache2-mod-qos using aptitude by running the following command:
sudo aptitude -y install libapache2-mod-qos
How To Uninstall libapache2-mod-qos on Debian 9
To uninstall only the libapache2-mod-qos package we can use the following command:
sudo apt-get remove libapache2-mod-qos
Uninstall libapache2-mod-qos And Its Dependencies
To uninstall libapache2-mod-qos and its dependencies that are no longer needed by Debian 9, we can use the command below:
sudo apt-get -y autoremove libapache2-mod-qos
Remove libapache2-mod-qos Configurations and Data
To remove libapache2-mod-qos configuration and data from Debian 9 we can use the following command:
sudo apt-get -y purge libapache2-mod-qos
Remove libapache2-mod-qos configuration, data, and all of its dependencies
We can use the following command to remove libapache2-mod-qos configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge libapache2-mod-qos
Dependencies
libapache2-mod-qos have the following dependencies:
References
Summary
In this tutorial we learn how to install libapache2-mod-qos package on Debian 9 using different package management tools: apt, apt-get and aptitude.