MongoDB replica sets practice (applicable to version 1.8, not applicable after version 2.0)

Db1 startup Item:

./Mongod -- dbpath/data/dbdata -- logpath/data/dblog/mongodb1.log -- fork

Then set the user name and password:

Use Admin
DB. adduser ("admin", "admin ");
Use local
DB. adduser ("repl", "repl ");

Then start again as verified

./Mongod -- replset ABC -- dbpath/data/dbdata -- logpath/data/dblog/mongodb1.log -- auth -- fork

DB2 is also started in the preceding method.

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Go to db1:

Use Admin

DB. Auth ("XXXX ");

Rs. Initiate ();

It takes 10 minutes to create a file.

Then execute Rs. Add ("db2serfer: 27017 ");

If db1 contains data, DB2 synchronizes the data.

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Add an arbiter

Start a server like db1.

Execute Rs. addarb ("xxxxxx: 27017") on the primary database (XXXX: Primary> ");

In this way, the arbiter is successfully added.

Execute Rs. Status (); To View, "health": 1, OK.

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Note that when adding arbiter, it must start like others, including authentication, user name and password.

When adding configuration, you need to enter the local database for verification.

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If the new server cannot synchronize data, you can only copy the file to the new server by importing the file, and add -- fastsync.

./Mongod -- replset ABC -- dbpath/data/dbdata -- logpath/data/dblog/mongodb1.log -- auth -- fork -- fastsync