haProxy in LXC

[Marx]

Hi
I'm coming from Docker, so I'm new to LXC containers and Proxmox. I have Galera MariaDB cluster - on each Proxmox node sits LXC with MariaDB. Now I want to make it accessible under single domain/IP. I see two possibilities:
- use DNS name with multiple IPs assigned. As I know, every time DNS server is queried about such domain, it return next IP, which makes it very simple load balancer
- use haProxy software - then I can create LXC container, install haProxy inside and configure it, but how configuration should look like? And how to make sure that, even if a node with LXC die, and it'll be moved over to different node, it still will be accesssible?

The aim is to have high availabiliy and load balancing, and I feel, maybe I should make it outside cluster?

 

[wolfgang]

Hi,

DNS and also HA-Proxy are not always clustered. And if not you have on this stack a single point of failure.

Assume you have DNS and HA-Proxy redundant the I would prefer HA-Proxy(the config is simple and can be found in may Blogs). Second DNS. If this is not the case you could use e.g. pacemaker to create an HA IP.

 

[William Edwards]

- use haProxy software - then I can create LXC container, install haProxy inside and configure it, but how configuration should look like? And how to make sure that, even if a node with LXC die, and it'll be moved over to different node, it still will be accesssible?

Use HA or VRRP (with Keepalived).

 

[Marx]

I've ended up creating plain Debian LXC, installing ClusterControl on separate temporary LXC with Docker, than allowing ClusterControl to create haProxy configuration on this Debian LXC. I can in future reuse haProxy for other use cases, so it's good solution for me.

I for the first time hear about VRRP but first look at google says it's something about routers.