Spin up read only shard

read_only_shard.js

var st = new ShardingTest({
  shards:1,
  mongos:1,
  other: {
    rs: true,
    numReplicas: 2,
    separateConfig: true
  }
})

var mongos = st.s0;
var admindb = mongos.getDB('admin');
admindb.runCommand({setParameter: 1, logLevel: 5});

print("-------- LOG LEVEL 5 -------");

db = mongos.getDB('wow');
sh.enableSharding('wow');

db.test.insert({ a: 1 }, { writeConcern: { w: 2 } });
db.test.insert({ a: 2 }, { writeConcern: { w: 2 } });
db.test.insert({ a: 3 }, { writeConcern: { w: 2 } });

var cursor = db.test.find();
while ( cursor.hasNext() ) {
   printjson( cursor.next() );
}

print("-------- Inserted Data -------");

var primary = st.shard0.rs.getPrimary();
primary.adminCommand({ "shutdown": 1 })

print("-------- Shutdown Primary -------");

rs.slaveOk();
db.getMongo().setReadPref('secondary');

cursor = db.test.find();
while ( cursor.hasNext() ) {
   printjson( cursor.next() );
}

print("-------- Printed Data -------");