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High availability hosting, where to start?

rocketrocket Member
in Help

I've got loads of spare VPS sat around doing nothing (were used for something else, not needed now) which I'd to use to try and setup a high availability system for a few websites I have.

All of the websites run WordPress so I know I'll need to make sure the database and files are always going to be the same on all of the servers at the same time. I also don't know how to get the visitors to go to a different server when another is down, I assume I'll need to use some DNS tricks but I'm not sure how, I currently use Cloudflare for all of the websites.

How should I go about getting the system setup, using all of the spare VPS I have from different providers?

Comments

  • raindog308raindog308 Administrator, Veteran

    Options:

    • DNS round robin
    • Load balancers and MySQL replication (which be native or something active-active like Galera)
    • Some kind of virtual IP-based failover (e.g. Pacemaker) in conjunction with MySQL replication. You'll want block storage here. You could do this at either the DB tier or web tier or both

    Essentially you have two or three problems:

    1. Make the DBs consistent
    2. Make your visitors always get to a web server that can talk to those DBs
    3. Keeping any non-database stuff (e.g., you upload an image in Wordpress) consistent

    Your tools are replication, virtual IPs, load balancers, and/or DNS. You really can do all of this without DNS trickery but it depends what you want.

    DO has some good tutorials on these. For HA setups, you will probably be happiest at a DO, Vultr, or Linode kind of host because they have fancier options.

    Thanked by 2flatland_spider vpsGOD
  • rocketrocket Member

    raindog308 said: DNS round robin

    Load balancers and MySQL replication (which be native or something active-active like Galera)

    These two sound like they'll be the easiest so I'll check into these.

    raindog308 said: Your tools are replication, virtual IPs, load balancers, and/or DNS. You really can do all of this without DNS trickery but it depends what you want.

    DO has some good tutorials on these. For HA setups, you will probably be happiest at a DO, Vultr, or Linode kind of host because they have fancier options.

    I'll have a read around on the DO tutorials and see if I can pick anything up. Thanks!

  • dedipromodedipromo Member

    https://www.linode.com/docs/websites/host-a-website-with-high-availability
    This tutorial will provide you with a good start on high availability website schematic design and deployment.

  • SplitIceSplitIce Member, Host Rep

    Anycast?

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