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Showing posts from April, 2011

Lessons learned from deploying a production database in EC2

In light of the Big EC2 Outage of 2011, I thought I'd offer some perspective on my experiences in deploying and maintaining a production database in EC2. I find it amusing to read some blog posts (esp. the one from SmugMug) where people brag about how they never went down during the EC2 outage, while saying in the same breath that their database infrastructure was hosted somewhere else...duh!

I will give a short history of why we (Evite) ended up hosting our database infrastructure in EC2. After all, this is not how people start using the cloud, since it's much easier to deploy web or app servers in the cloud. I will also highlight some lessons learned along the way.

In the summer of 2009 we decided to follow the example of FriendFeed and store our data in an almost schema-less fashion, but still use MySQL. At the time, NoSQL products such as Cassandra, Riak, etc were still very much untested at large scale, so we thought we'd use something we're familiar with. We design…

Installing and configuring Graphite

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Here are some notes I jotted down while installing and configuring Graphite, which isn't a trivial task, although the official documentation isn't too bad. The next step is to turn them into a Chef recipe. These instructions apply to Ubuntu 10.04 32-bit with Python 2.6.5 so YMMV.

Install pre-requisites

# apt-get install python-setuptools
# apt-get install python-memcache python-sqlite
# apt-get install apache2 libapache2-mod-python pkg-config
# easy_install-2.6 django

Install pixman, cairo and pycairo

# wget http://cairographics.org/releases/pixman-0.20.2.tar.gz
# tar xvfz pixman-0.20.2.tar.gz
# cd pixman-0.20.2
# ./configure; make; make install

# wget http://cairographics.org/releases/cairo-1.10.2.tar.gz
# tar xvfz cairo-1.10.2.tar.gz
# cd cairo-1.10.2
# ./configure; make; make install

BTW, the pycairo install was the funkiest I've seen so far for a Python package, and that says a lot:

# wget http://cairographics.org/releases/py2cairo-1.8.10.tar.gz
# tar xvfz py2cairo-1.8.10.tar.gz
# cd py…