A simple recipe for MongoDB clusters

Hi everybody!

my task of today, was to configure a MongoDB with redundancy and high availability…

I decided to write my own Chef cookbook to configure “replica”

Below the most important parts:

Install MongoDB packages

Screen Shot 2016-10-14 at 21.13.03.png

Use template for the main configuration file

screen-shot-2016-10-14-at-21-15-04

Enable Linux service of MongoDB at the boot

screen-shot-2016-10-14-at-21-15-57

What about the replica’s configuration?

I suggest to use a custom LWRP that execute rs.initiate() to declare the replica set, rs.add(); to add primary and secondary servers, rs.addArb() to add arbiter servers. You can loop over hashes like this:

foobar => { “secondaries” => [“mynode01:27017″,”mynode02:27017”]}

and a Chef provider like this

screen-shot-2016-11-09-at-21-38-31

I need to test my cluster, so let’s prepare a Vagrant file like this in order to manage all virtual machines concurrently

screen-shot-2016-10-14-at-21-23-16

Finally, Haproxy as reverse proxy and load balancer! Use autodiscovery (https://github.com/hw-cookbooks/haproxy) in order to find automatically the backends and “health check” to point to the right node after a new primary server’s promotion.

screen-shot-2016-10-14-at-21-25-20

 

Ad maiora!

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