Configuring a Replica Set: Adding the First Member

• How do you start?

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  • Backup any existing data
  • Recommended: start with a fresh MongoDB installation

• How do you configure replica set names?

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  • Add an entry to DNS or the local "/etc/hosts" file
  • Example: mongo0rs0.company.com = replica set rs0, 1st server
  • Make sure you can connect to the secondaries

• How do you configure the mongod.conf file?

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  • Set the parameters as appropriate to your system
  • Comment out bind_ip to allow MongoDB to respond to all network cards
  • You must configure the replSet parameter
  • Example: replSet=rs0
  • Do not set priority here!
  • Master/Slave configuration is not recommended: use replica sets

• What is the startup sequence?

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  • Restart MongoDB
  • Access the mongo shell
  • Authenticate if necessary
  • Initialize: rs.initiate()

• How do you know the replica set is running?

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  • Access the mongo shell
  • The command prompt should reflect the status
  • View status: rs.status()
  • View config: rs.conf()