reliability & availability

patterns#

There are two complementary patterns to support high availability: fail-over and replication. Active-Passive and Active-Active are two types of redundancy configurations that enable high availability in the event of systems failure.

Active/passive failover. Active/passive failover configurations provide a fully redundant instance of each node that is brought online only if its associated primary node fails.

Active-active failover (Active Redundancy) In active-active, both servers are managing traffic, spreading the load between them.

Master-slave replication.

Master-master replication.

Practices & principles.

You wanna make sure that first and foremost that your system doesn’t have single point of failure.=> use redundancy

language:

failover plan

sources: fine-grained book,