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How to use HAProxy to make your K3s API Server highly available

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What does High Availability (HA) mean for a K3s Kubernetes cluster? Previously we discovered that our control plane was configured to be HA - we have three controller nodes, each with all of the required control plane components. The one thing that was missing was a load balancer external to our cluster. Without this, if our main controller went down we would be unable to access the Kubernetes API Server. We chose HAProxy as our load balancing solution. Nginx, Traefik, or any other load balancer would also work. Traffic now enters our network and then routes through HAProxy which chooses one of the three available control plane nodes.
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Опубликовано:

28 авг 2024

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Комментарии : 4

@TheKingofparis148 2 месяца назад

Live the video gained a Sub. The speed that you all go over this content is great!!!

@danibjor 2 года назад

If you are using etcd on the controllers, then you need majority of controllers in the cluster to be online for the cluster to work, thus you need at least 3 servers in a cluster to survive one server going offline. 5 controllers gives you option to loose 2.

@honeysatwika4123 2 года назад

Hey guys good stuff but I have issue can u guide in that regard The requirement is like this Haproxy is installed on one server my sql on other two servers, what my requirement is I want read on one mysql server and read and write on other myself server how to configure to make it happen

@DevsOperative 2 года назад

Thanks for the question! Hopefully we can help :) You should be able to set up two entries in your HAProxy config, one named read-only-db and one read-write-db. The read-only-db would point to both of your mysql servers. The read-write-db would only point to the server you want to write to. Feel free to jump in our Discord if you have any further questions or want to discuss! discord.gg/devsoperative