IT

Redis is a powerful tool to store key-value data in various formats. Here’s a simple way to create failover replication. Sometimes people call this a Redis cluster, but in reality it’s just a few servers (preferably 3 for Sentinel quorum) with one master and multiple slaves in different configurations (slave of slave, slave by priority, local slave, etc.).

Sometimes you need to connect two AWS networks without using AWS managed VPN services. Most tutorials show a simple tunnel between two instances, but they ignore high availability. That usually leads to asymmetric routing or a single point of failure.