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In order to save the new database, data will need to be added. By default, the existing test database is used when you connect to MongoDB.
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The best way to verify that replication is working and the members are all communicating is to create a new test database. The output should look similar to the following: rs1:PRIMARY> rs.conf() To verify that the members have been added correctly run the rs.conf() command again. To add a member to your replication set use the command: rs.add("mongo1:27017")īelow is output for the command rs.add: rs1:PRIMARY> rs.add("mongo2:27017") The output should look similar to the following: rs.conf() To see the current configuration run the command: rs.conf() "info2" : "no configuration explicitly specified - making one", The output should look similar to the following: > rs.initiate() Run the rs.initiate() command which will begin creating the replication set with the current member. You should see the message switched to db admin. The variable is the name of replication set member you are working on, in this example mongo0.Īt the MongoDB prompt, switch to admin with the command: use admin
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Start MongoDB client on only one member of the replication set with the command: mongo -host mongo]# mongod -config /etc/nfĪbout to fork child process, waiting until server is ready for connections.Īll output going to: /var/log/mongo/mongod.logĬhild process started successfully, parent exiting Your output should look similar once the daemon has started. The command is as follows: mongod -config /etc/nf You will use this configuration file to start the daemon on every member of the replication set. Creating a Replication SetĪ nf file was created during the installation.
#Install mongodb centos 6.7 manual#
This election action allows the set to resume normal operations without manual intervention. In the event the primary is not available, elections take place to select a new primary. The primary member is the only one that can accept write operations. Elections take place after the replication set is initiated and when the primary is not available. It is recommended that an odd number of members be used in a set since it will make elections easier.Įlections are to select which set member will become the primary. It provides redundancy in the event of system failure. In this example, the sample replication set is rs1, however, you may change the name as you choose.Ī replication set will allow your data to be “copied over” or propagated to all other members in the set. However, you can use the text editor you prefer. Replace the name in brackets with your own hostname. Make sure the hostname is set on every member of the replication set by editing the hostname file: nano /etc/hostname If you are not familiar with the sudo command, you can review our Commands that require elevated privileges are prefixed with sudo. This guide is written for a non-root user.
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#Install mongodb centos 6.7 series#
If you are new to Linux server administration, you may want to consult our using Linux document series including the A replication set is used for redundancy and to provide access to your data in the event of a node failure.īefore installing MongoDB, it is assumed that you have followed our getting started guide. MongoDB is scalable and an alternative to the standard relational database management system (RDBMS). MongoDB is an open-source non-SQL database engine.