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Add dns_cache for server addresses as in pgbouncer (#249)

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* Add dns_cache so server addresses are cached and invalidated when DNS changes.

Adds a module to deal with dns_cache feature. It's
main struct is CachedResolver, which is a simple thread safe
hostname <-> Ips cache with the ability to refresh resolutions
every `dns_max_ttl` seconds. This way, a client can check whether its
ip address has changed.

* Allow reloading dns cached

* Add documentation for dns_cached
This commit is contained in:
Jose Fernández
2023-05-02 10:26:40 +02:00
committed by GitHub
parent 3601130ba1
commit 7dfbd993f2
10 changed files with 794 additions and 3 deletions
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pgcat.toml
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@@ -146,6 +146,14 @@ idle_timeout = 40000
# Connect timeout can be overwritten in the pool
connect_timeout = 3000
# When enabled, ip resolutions for server connections specified using hostnames will be cached
# and checked for changes every `dns_max_ttl` seconds. If a change in the host resolution is found
# old ip connections are closed (gracefully) and new connections will start using new ip.
# dns_cache_enabled = false
# Specifies how often (in seconds) cached ip addresses for servers are rechecked (see `dns_cache_enabled`).
# dns_max_ttl = 30
# User configs are structured as pool.<pool_name>.users.<user_index>
# This section holds the credentials for users that may connect to this cluster
[pools.sharded_db.users.0]