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feat: make database connection pool size configurable (#21403)

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Closes https://github.com/coder/coder/issues/21360

A few considerations/notes:
- I've kept the number of conns to 10 in all other places, except coderd
- which uses the config value
- I opted to also make idle conns configurable; the greater the delta
between max open and max idle, the more connection churn
- Postgres maintains a [_process_ per
connection](https://www.postgresql.org/docs/current/connect-estab.html),
contrary to what the comment said previously
- Operators should be able to tune this, since process churn can
negatively affect OS scheduling
- I've set the value to `"auto"` by default so it's not another knob one
_has to_ twiddle, and sets max idle = max conns / 3

---------

Signed-off-by: Danny Kopping <danny@coder.com>
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Danny Kopping
2026-01-13 10:50:57 +02:00
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parent 61ae5b81ab
commit 49a42eff5c
13 changed files with 334 additions and 17 deletions
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@@ -1015,6 +1015,28 @@ URL of a PostgreSQL database. If empty, PostgreSQL binaries will be downloaded f
Type of auth to use when connecting to postgres. For AWS RDS, using IAM authentication (awsiamrds) is recommended.
### --postgres-conn-max-open
| | |
|-------------|--------------------------------------|
| Type | <code>int</code> |
| Environment | <code>$CODER_PG_CONN_MAX_OPEN</code> |
| YAML | <code>pgConnMaxOpen</code> |
| Default | <code>10</code> |
Maximum number of open connections to the database. Defaults to 10.
### --postgres-conn-max-idle
| | |
|-------------|--------------------------------------|
| Type | <code>string</code> |
| Environment | <code>$CODER_PG_CONN_MAX_IDLE</code> |
| YAML | <code>pgConnMaxIdle</code> |
| Default | <code>auto</code> |
Maximum number of idle connections to the database. Set to "auto" (the default) to use max open / 3. Value must be greater or equal to 0; 0 means explicitly no idle connections.
### --secure-auth-cookie
| | |