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sharding.html
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<body>
<div class="document" id="sharding-notes">
<h1 class="title">Sharding Notes</h1>
<div class="section" id="setting-up-a-sharded-cluster">
<h1>Setting up a sharded cluster</h1>
<p>Create directories for mongod instances:</p>
<pre class="literal-block">
mkdir /data/shard1 /data/shard2 /data/config
</pre>
<p>Start up 3 mongod instances:</p>
<pre class="literal-block">
mongod --dbpath /data/shard1 --port 10000 --shardsvr
mongod --dbpath /data/shard2 --port 10001 --shardsvr
mongod --dbpath /data/config --port 20000 --configsvr
</pre>
<p>Start an instance of mongos:</p>
<pre class="literal-block">
# --chunkSize 1 means use a 1MB chunk size. This is for
# demonstration purposes.
mongos --configdb localhost:20000 --chunkSize 1
</pre>
<p>Add shards to the cluster:</p>
<pre class="literal-block">
mongo
mongos> use admin
# Pre MongoDB 2.0
mongos> db.runCommand({'addshard': 'localhost:10000'})
mongos> db.runCommand({'addshard': 'localhost:10001'})
# Post MongoDB 2.0
mongos> sh.addShard('localhost:10000')
mongos> sh.addShard('localhost:10001')
</pre>
<p>Enable sharding on a database:</p>
<pre class="literal-block">
# Pre MongoDB 2.0
mongos> db.runCommand({'enablesharding': <database name>})
# Post MongoDB 2.0
mongos> sh.enableSharding(<database name>)
</pre>
<p>Shard a collection:</p>
<pre class="literal-block">
# Pre MongoDB 2.0
mongos> db.runCommand({'shardcollection': <namespace>, 'key': <shard key>})
# Post MongoDB 2.0
mongos> sh.shardCollection(<namespace>, <shard key>)
</pre>
</div>
<div class="section" id="important-sharding-commands">
<h1>Important Sharding Commands</h1>
<pre class="literal-block">
sh.help()
db.printShardingStatus()
</pre>
</div>
<div class="section" id="exercises">
<h1>Exercises</h1>
<ol class="arabic simple">
<li>Set up a sharded cluster on your local machine using the instructions above.</li>
<li>Generate some simple data using the example from the "General Ops Notes" page.</li>
<li>Shard the collection on a field (or fields) other than _id.</li>
<li>Explore the config db. Query the changelog and locks collections.</li>
</ol>
</div>
</div>
</body>
</html>