Compose Deployments often use proxies, such as HAproxy, to provide a more secure way of accessing the databases within the deployment. As such they manage the life cycle of connections between the server and client. We detail them here as a reference for driver writers and others who have an interest in the low-level activity of Compose database connections.

MongoDB and PostgreSQL

Setting	MongoDB	PostgreSQL	Applies
client	5m	1d	When the client is expect to acknowledge or send data.
connect	4s	4s	When a connection is being made between the proxy and the server.
server	5m	30m	When the server is expected to acknowledge or send data.
tunnel	1d	1d	When a bidirectional connection is established between a client and a server, and the connection remains inactive in both directions.
client-fin	1h	5m	When the client is expected to acknowledge or send data while one direction is already shut down.
check	5s	5s	As a secondary timeout check when a connection is being made between the proxy and the server.

Redis and MySQL

Setting	Redis	MySQL	Applies
client	5m	1d	When the client is expect to acknowledge or send data.
connect	4s	4s	When a connection is being made between the proxy and the server.
server	5m	30m	When the server is expected to acknowledge or send data.
tunnel	1d	1d	When a bidirectional connection is established between a client and a server, and the connection remains inactive in both directions.
client-fin	1h	5m	When the client is expected to acknowledge or send data while one direction is already shut down.
check	5s	5s	As a secondary timeout check when a connection is being made between the proxy and the server.

RethinkDB and Scylla

Setting	RethinkDB	Scylla	Applies
client	5m	5m	When the client is expect to acknowledge or send data.
connect	4s	4s	When a connection is being made between the proxy and the server.
server	5m	5m	When the server is expected to acknowledge or send data.
tunnel	1d	1d	When a bidirectional connection is established between a client and a server, and the connection remains inactive in both directions.
client-fin	1h	1h	When the client is expected to acknowledge or send data while one direction is already shut down.
check	5s	5s	As a secondary timeout check when a connection is being made between the proxy and the server.

RabbitMQ and etcd

Setting	RabbitMQ	etcd	Applies
client	3h	1d	When the client is expect to acknowledge or send data.
connect	10s	1m	When a connection is being made between the proxy and the server.
server	3h	1d	When the server is expected to acknowledge or send data.
tunnel	1d		When a bidirectional connection is established between a client and a server, and the connection remains inactive in both directions.
client-fin	1h		When the client is expected to acknowledge or send data while one direction is already shut down.
check	5s	1m	As a secondary timeout check when a connection is being made between the proxy and the server.

Elasticsearch

Setting	Elasticsearch	Applies
client	1m	When the client is expect to acknowledge or send data.
connect	9s	When a connection is being made between the proxy and the server.
server	2m	When the server is expected to acknowledge or send data.
tunnel		When a bidirectional connection is established between a client and a server, and the connection remains inactive in both directions.
client-fin		When the client is expected to acknowledge or send data while one direction is already shut down.
check	5s	As a secondary timeout check when a connection is being made between the proxy and the server.
http-request	5s	The maximum allowed time to wait for a complete HTTP request

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