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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>
This commit is contained in:
Danny Kopping
2026-01-13 10:50:57 +02:00
committed by GitHub
parent 61ae5b81ab
commit 49a42eff5c
13 changed files with 334 additions and 17 deletions
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docs/reference/api/general.md
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+2
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@@ -433,6 +433,8 @@ curl -X GET http://coder-server:8080/api/v2/deployment/config \
"username_field": "string"
},
"pg_auth": "string",
"pg_conn_max_idle": "string",
"pg_conn_max_open": 0,
"pg_connection_url": "string",
"pprof": {
"address": {
docs/reference/api/schemas.md
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+6
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@@ -2893,6 +2893,8 @@ CreateWorkspaceRequest provides options for creating a new workspace. Only one o
"username_field": "string"
},
"pg_auth": "string",
"pg_conn_max_idle": "string",
"pg_conn_max_open": 0,
"pg_connection_url": "string",
"pprof": {
"address": {
@@ -3432,6 +3434,8 @@ CreateWorkspaceRequest provides options for creating a new workspace. Only one o
"username_field": "string"
},
"pg_auth": "string",
"pg_conn_max_idle": "string",
"pg_conn_max_open": 0,
"pg_connection_url": "string",
"pprof": {
"address": {
@@ -3622,6 +3626,8 @@ CreateWorkspaceRequest provides options for creating a new workspace. Only one o
| `oauth2` | [codersdk.OAuth2Config](#codersdkoauth2config) | false | | |
| `oidc` | [codersdk.OIDCConfig](#codersdkoidcconfig) | false | | |
| `pg_auth` | string | false | | |
| `pg_conn_max_idle` | string | false | | |
| `pg_conn_max_open` | integer | false | | |
| `pg_connection_url` | string | false | | |
| `pprof` | [codersdk.PprofConfig](#codersdkpprofconfig) | false | | |
| `prometheus` | [codersdk.PrometheusConfig](#codersdkprometheusconfig) | false | | |