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Re:Docker 1.12: Now with Built-In Orchestration by btgeekboy on Monday June 20, 2016 @10:10PM (#11943044)
> If you need HA on a database, use the built-in replication service available on just about every database product in existence.

There are often valid reasons to not do this. For example, MySQL does not guarantee consistency between a source and its destination. mysqlrplsync can do this as a bandage, but it's something extra you need to set up and configure.

Re:Docker 1.12: Now with Built-In Orchestration by cpuguy83 on Tuesday June 21, 2016 @05:38AM (#11944584)
I do not think this is a reason to not use replication. In this sense, no distributed system guarantees consistency. If a node goes down (particularly a leader!) while trying to distribute a new update, you are very likely to run into issues.

Replication != backup