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Amazon EC2 Quickstart seems to be a bit misleading
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Justin Meltzer  
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 More options Oct 14 2012, 1:41 am
From: Justin Meltzer <jus...@airtimehq.com>
Date: Sat, 13 Oct 2012 22:41:15 -0700 (PDT)
Local: Sun, Oct 14 2012 1:41 am
Subject: Amazon EC2 Quickstart seems to be a bit misleading
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A couple months ago I followed the guide
here: http://www.mongodb.org/display/DOCS/Amazon+EC2+Quickstart#AmazonEC2Qu...
to get a single MongoDB database up and running.

I followed the guide strictly, first creating EBS volumes, converted them
to RAID 10, created a volume group and logical volumes for logs,
journaling, and data, made filesystems from each of the partitions and then
mounted the file systems.

Then under "Install and Configure
MongoDB" http://www.mongodb.org/display/DOCS/Amazon+EC2+Quickstart#AmazonEC2Qu...
it states if you created a MongoDB instance from the AWS Marketplace, then
you can skip ahead to "Starting MongoDB". Since I did create a MongoDB
instance from the marketplace, I did just this. However, I just now
realized that the mongod.conf file automatically created from the
marketplace does not have a dbpath set to /data, but rather to
/var/lib/mongo. Setting the correct dbpath was in the part that I was told
to skip.

Unfortunately since I now have data in the wrong directory, how can I
safely switch over to the right directory while copying over my data?


 
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Bernardo  
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 More options Oct 14 2012, 11:52 am
From: Bernardo <bfa...@gmail.com>
Date: Sun, 14 Oct 2012 08:52:09 -0700 (PDT)
Local: Sun, Oct 14 2012 11:52 am
Subject: Re: Amazon EC2 Quickstart seems to be a bit misleading
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Can you have downtime? Just shut your mongod down, manually move the data
from /var/lib/mongo to /data, edit the config to point to the new data, and
restart mongod.

Can't have downtime? Start a new mongod instance pointed to /data on a
different port, create a replica set on the primary and add your new
secondary to the replica set(oh and start a 3rd mongod as an arbiter on a
3rd port). Wait for the recovery to be finished, shut down the first mongod
and your new secondary will become primary, pointing to new data.


 
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