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YugabyteDB

​YugabyteDB is a PostgreSQL-compatible Open-Source Distributed SQL database. It adds horizontal scalability to applications built for PostgreSQL. We can use pREST works by connecting to any YugabyteDB node.
Start a YugabyteDB cluster with one of the Quick Start methods: YugabyteDB Documentation / Quick Start​
Start prestd with the PostgreSQL connection string to one YugabyteDB node ( default port is 5433 )
Node locality
In a public or private cloud, there are multiple ways to scale out the pREST servers with YugabyteDB nodes:
Start prestd with PREST_PG_URL set to a cluster service (HA proxy, Kubernetes ClusterIP...) over the YugabyteDB nodes
Start one prestd for each YugabyteDB node, with its local IP
change the github.com/jackc/pgx driver to the cluster-aware one github.com/yugabyte/pgx/v4, as in https://docs.yugabyte.com/preview/drivers-orms/go/yb-pgx/, so that it discovers all nodes of the cluster from any node.
With geo-distribution, it is recommended to co-locate the prestd server in the same zone as the database node(s) it connects to. This will lower the latency and increase availability.
Testing
Start a YugabyteDB cluster with one of the Quick Start methods: YugabyteDB Documentation / Quick Start​
Start prestd with the PostgreSQL connection string to one YugabyteDB node ( default port is 5433 )
Example
Starting a single-node YugabyteDB cluster on Docker:
docker network create yb-net
​
docker run -d --hostname yb-tserver-n1 -p 7000:7000 \
  --network yb-net yugabytedb/yugabyte:2.14.6.0-b30 \
  yugabyted start --daemon false --listen yb-tserver-n1
Starting prestd connecting to this node:
docker run -d -p 3001:3000 --network yb-net \
  -e PREST_PG_URL=postgres://yugabyte:yugabyte@yb-tserver-n1:5433/yugabyte \
  -e PREST_DEBUG=true \
  prest/prest:v1
Creating a view (yb_servers() is a table function showing all YugabyteDB nodes in the cluster)
docker run --rm --network yb-net yugabytedb/yugabyte \
  ysqlsh -h yb-tserver-n1 -c "
   create view yb_servers as select host,zone,region,cloud from yb_servers()
"
Querying this view through the REST API:
curl -i -X GET "http://127.0.0.1:3001/yugabyte/public/yb_servers" -H "Content-Type: application/json"
​
[{"host": "yb-tserver-n1", "zone": "rack1", "cloud": "cloud1", "region": "datacenter1"}]
Starting two more YugabyteDB nodes (yb-tserver-n2 and yb-tserver-n3) to join the previous one (yb-tserver-n1):
docker run -d --hostname yb-tserver-n2 \
  --network yb-net yugabytedb/yugabyte:2.14.6.0-b30 \
  yugabyted start --join yb-tserver-n1 --daemon false --listen yb-tserver-n2
  
docker run -d --hostname yb-tserver-n3 \
  --network yb-net yugabytedb/yugabyte:2.14.6.0-b30 \
  yugabyted start --join yb-tserver-n1 --daemon false --listen yb-tserver-n3
Starting one prestd for each YugabyteDB node:
docker run -d -p 3002:3000 --network yb-net \
  -e PREST_PG_URL=postgres://yugabyte:yugabyte@yb-tserver-n2:5433/yugabyte \
  -e PREST_DEBUG=true \
  prest/prest:v1
  
docker run -d -p 3003:3000 --network yb-net \
  -e PREST_PG_URL=postgres://yugabyte:yugabyte@yb-tserver-n3:5433/yugabyte \
  -e PREST_DEBUG=true \
  prest/prest:v1
Querying any endpoint to read from the view
curl -i -X GET "http://127.0.0.1:3001/yugabyte/public/yb_servers" -H "Content-Type: application/json"
​
[{"host": "yb-tserver-n3", "zone": "rack1", "cloud": "cloud1", "region": "datacenter1"}, {"host": "yb-tserver-n2", "zone": "rack1", "cloud": "cloud1", "region": "datacenter1"}, {"host": "yb-tserver-n1", "zone": "rack1", "cloud": "cloud1", "region": "datacenter1"}]
​
curl -i -X GET "http://127.0.0.1:3003/yugabyte/public/yb_servers" -H "Content-Type: application/json"
​
[{"host": "yb-tserver-n3", "zone": "rack1", "cloud": "cloud1", "region": "datacenter1"}, {"host": "yb-tserver-n2", "zone": "rack1", "cloud": "cloud1", "region": "datacenter1"}, {"host": "yb-tserver-n1", "zone": "rack1", "cloud": "cloud1", "region": "datacenter1"}]
All works as with PostgreSQL, with the additional High Availability and Elasticity provided by YugabyteDB 🚀
TimescaleDB