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Karim Naufal 2022-02-17 23:24:23 +01:00
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README.md
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@ -126,17 +126,19 @@ ssh root@xxx.xxx.xxx.xxx -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no
## High Availability ## High Availability
By default, we have 3 control planes configured and 2 agents, with automatic upgrades and reboots of the nodes. By default, we have 3 control planes and 2 agents configured, with automatic upgrades and reboots of the nodes.
**But if you want to remain HA, it's important to keep a number of control planes nodes of at least 3 (2 to maintain quorum when 1 goes down for automated upgrades and reboot for instance), see [Rancher's doc on HA](https://rancher.com/docs/k3s/latest/en/installation/ha-embedded/).** **If you want to remain HA (no downtime), it's important to keep a number of control planes nodes of at least 3 (2 minimum to maintain quorum when 1 goes down for automated upgrades and reboot), see [Rancher's doc on HA](https://rancher.com/docs/k3s/latest/en/installation/ha-embedded/).**
Otherwise, it's important to turn off automatic upgrades (see below) for the control-plane nodes (2 or less), and do the maintenance yourself. Otherwise, it's important to turn off automatic upgrades of the OS only (k3s can continue to update without issue) for the control-plane nodes (when 2 or less control-plane nodes), and do the maintenance yourself.
## Automatic Upgrade ## Automatic Upgrade
By default, MicroOS gets upgraded automatically on each node, and reboot safely via [Kured](https://github.com/weaveworks/kured) installed in the cluster. By default, MicroOS gets upgraded automatically on each node, and reboot safely via [Kured](https://github.com/weaveworks/kured) installed in the cluster.
As for k3s it is also automatically upgrades thanks to Rancher's [system upgrade controller](https://github.com/rancher/system-upgrade-controller). By default it follows the k3s `stable` channel, but you can also change to `latest` one if needed, or specify a target version to upgrade to via the upgrade plan. You can copy and modify the one in the templates for that! More on the subject in [k3s upgrades basic](https://rancher.com/docs/k3s/latest/en/upgrades/basic/). As for k3s, it also automatically upgrades thanks to Rancher's [system upgrade controller](https://github.com/rancher/system-upgrade-controller). By default it follows the k3s `stable` channel, but you can also change to `latest` one if needed, or specify a target version to upgrade to via the upgrade plan.
You can copy and modify the [one in the templates](https://github.com/kube-hetzner/kube-hetzner/blob/master/templates/plans.yaml.tpl) for that! More on the subject in [k3s upgrades basic](https://rancher.com/docs/k3s/latest/en/upgrades/basic/).
_If you wish to turn off automatic MicroOS upgrades on a specific node, you need to ssh into it and issue the following command:_ _If you wish to turn off automatic MicroOS upgrades on a specific node, you need to ssh into it and issue the following command:_