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How to setup a MongoDB with Vagrant and Docker

In order for servers to communicate I guess you would need to configure port forwarding properly, so that routing server would be able to access shards, and vice versa.

With Vagrant one can configure port forwarding, and in this case, I suppose also needs to be combined with ports being properly configured for Docker containers. Refer to Vagrant Networking Configuration page and Vagrant's Docker provider configuration page.

Worth noting that eventually you might also want to configure links between Docker containers, which is also done in Docker provider config. More about linking containers together is in Docker documentation.

Then, to add shards to the routing server, you might use Vagrant's Shell Provisioner. This one allows executing custom shell scripts on the machine once it is up and running. Provided that mongo client allows inline scripts to be run, you could use something similar to following:

app.vm.provision "shell", inline:
'mongo --eval "sh.addShard("shard1_host:port");"'

I'm sorry, I didn't test the command above myself, so not sure this will be working out of the box, but this gives a general idea. (In fact, I'm pretty sure there is something wrong with the quotes in it :) ).

You can also create variables in the Vagrantfile, just the same way as you would do in any other Ruby source file, and reuse them in order to not to repeat IPs and port numbers, for better maintainability.

Note that you can also run vagrant <name of the instnance> ssh to get the shell access into the container (provided it is in a 'running' state), and run commands inside. This might be useful when debugging the network and provisioning logic.

Excuse me, I didn't test any of these ideas with MongoDB exactly, but only with other types of services. But I think that same principles applied to MondoDB should work fine as well.

Categories : Mongodb

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