[chef] Re: Replica set setup with chef

[Benton Roberts < >]

Hello, Micah.

On Jan 21, 2011, at 6:49 PM, Micah Wedemeyer wrote:
> Is anyone doing Mongo sharding or replica sets with chef?
You may be interested in some code from a mongoDB recipe we have used at 
Aranetic. Within our mongoDB cookbook, the regular default.rb recipe file 
takes care of the usual business of installing the software and writing the 
replica set name into the config file. That's the easy part.

> Otherwise, I need to wait for the server to come up, send it the command, 
> and then hope that everything works.
Exactly. As you say, the tricky part is waiting for the server to come up 
(which can take a LONG time, depending on the size of the data you're 
replicating, and your disk speed), and then sending the proper commands 
needed to establish replication. One wrinkle is that establishing the server 
as a slave involves contacting the master, and altering its configuration 
directly. To determine which nodes might be the master, this recipe searches 
the Chef server for all existing nodes with the same attribute vale 
[:mongodb][:repl_set].

The following code attempts to do all of that, in the context of a Chef 
recipe:
 https://gist.github.com/793295

One thing this recipe does NOT do is to remove no-longer-reachable nodes from 
the master's replication config. Another is sharding. Further collaboration 
on both aspects is welcome.

Good luck,
- benton
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Benton Roberts

 
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