• Uptime

Its all about uptime!

System uptime and availability is being increasingly important. Various services are expected to be accessibly at all times. The challenge is to configure and maintain such a system, with minimal downtime, and preferable no downtime at all. At first this sounds like a very complicated task, but breaking it down to its components makes it possible.

These are our worst foes

Deciding the level of importance of the system really depends on the physical environment. As we can see there are

• Power outage
• Internet access
• Hardware malfunction
• Software updates

To get around this a redundant system has to be built. Realizing that a redundant system consists of many redundant parts, virtualization naturally comes to mind.

Configure your system

• KVM Host

• KVM Guest

Manage Virtual Domains

• Domain Creation

• Domain Console

• Domain Destruction

• Domain Editing

• Domain Cloning

• Domain Migration

Network Planning

• Network Planning

Configure a Redundant Service

• DNS

• DHCP

• NTP

• GlusterFS

• Corosync and HA-proxy

• Mariadb

• Redis

• Apache

• LDAP

• Postfix

• Dovecot

• Nextcloud

• OPNsense

This project is based on the GNU/Linux software packaged by Debian, currently the buster release. The information provided here will most likely work on other GNU/Linux systems as well. Basic knowledge of GNU/Linux commandline tools, file editing, network etc. is required to use and understand this guide.

TODO