Multiple primaries accepting write operations would lead to data conflicts.īy default, applications will only query the primary member for both read and write operations. Each replica set can have only one primary member at a time, as replication happens by copying the primary’s oplog (short for “operations log”) and repeating the logged changes on the secondaries’ respective data sets. The primary member is the main access point for transactions with the replica set and is the only member that can accept write operations. Every replica set must have one primary member and at least one secondary member. Each running instance of MongoDB that’s part of a given replica set is referred to as one of its members. Lastly, commands that must be run or file changes that must be made on every server will have a standard black background, like this:Īs mentioned in the introduction, MongoDB handles replication through an implementation called replica sets. Any examples showing commands or file changes performed on mongo0 will have a blue background, like this:Ĭommands and file changes performed on mongo1 will have a pink background:Įxample actions on mongo2 will have a green background: Please note that, for clarity, this guide will refer to the three servers as mongo0, mongo1, and mongo2. To this end, follow our tutorial on How To Install MongoDB on Ubuntu 20.04, making sure to complete each step on all three of your servers.
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