TCP Proxy

This is a simple tcp proxy server that can be used to proxy any tcp connection. It can be used to proxy keydb, redis, memcached, or any other tcp connection

Production Ready

Yes, it's production ready and it's being used to create a HA KeyDB (Redis drop-in replacement)

Benchmarks

The performance penalty is ~7% compared to a direct connection to a KeyDB instance

You can see the benchmarks here

Usage

• Check the examples folder for a kubernetes setup of a HA KeyDB

• You can also see an example config here

  • It's multitenant so you can add as many pools and remotes as you want
  • Each pool is a separate load balancer between the defined remotes

Important:

• The TCPProxy uses primary/secondary load balancing, it doesn't do round-robin between remotes.
  • It will always try to use the primary remote and if it's down it will switch to the secondary remote. If you have more than 2 remotes, when the primary is down, it will connect to the next available remote.
• You need at least 2 remotes defined, otherwise it won't work

How it works

• It starts a TCPChecker service for all defined remotes in the config
• The TCPChecker is responsible for checking if the remote is up or down
• If the remote is down it automatically switches to the other defined remote
• In case of KeyDB/Redis if the remote returns "Loading Keys" it will mark the remote as offline and switch to the other one
• Each connection has a separate ProxyContext which is responsible for handling the upstream/downstream connections

This setup is used to create a HA KeyDB (Redis drop-in replacement) with Active Replication

License

MIT