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	# Overview

	Kolab is deployed in a two node K3S cluster, using local storage on the nodes (no shared storage required).

	All data is replicated from the primary to the secondary node via drbd, and it is possible to fail over to the secondary node if the primary is lost.

	All external connections are going through HA-Proxy with ip failover via keepalived, so failing over is transparent externally.

	Some load-balancing can be achieved by using services on both nodes, but to have high-availability, a single node must be able to handle the complete load.

	Both mariadb and HA-Proxy are run outside of k3s for this deployment.

	This deployment is more complex in that not all components can be run in k3s, and workloads need to be explicitly assigned to nodes,
	but it allows to achieve redundancy and a limited amount of load-balancing with minimal resources (only two nodes, using local disks).

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