Hi guys, Let’s suppose I have two droplets ‘A’ and ‘B’. In ‘A’ droplet a NodeJS server broadcasts and receives the messages through websocket. My question is that How do I create the replicate of droplet ‘A’? In case droplet A down/fail then droplet ‘B’ automatically start the broadcasting and receiving the messages from users. Thanks,
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Hello,
In order to be able to do this kind of failover, I would recommend using a load balancer. You can take a look at this article here on how to
https://www.digitalocean.com/community/tutorials/5-digitalocean-load-balancer-use-cases
Also, there are a lot of other Load balancing tutorials here:
https://www.digitalocean.com/community/tags/load-balancing?type=tutorials
I would recommend having a similar setup to this one here:
So 1 Load balancer, 2 web servers, and 1 database server.
Regarding the droplet replication, you could create a snapshot of your existing droplet and create a second droplet from that snapshot. That way you would have an exact copy. If you are going to be making a lot of changes to the files of your app, you could use a service like lsyncd to replicate your files, or just use DigitalOcean block storage solution and share a specific folder between the two droplets.
Hope that this helps! Regards, Bobby
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