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Fix docker scaling and show loading MOTD (#529)

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* fix: Reduce log spam for sleeping servers

* fix: Fix autodownscaling for initial player connection

* fix: Instant route updating when a docker container is downscaled

* feat: Show asleep or loading motd while the server is waking up
This commit is contained in:
Lenart Kos
2026-02-26 03:46:51 +01:00
committed by GitHub
parent ea6419bece
commit 2023e73892
13 changed files with 220 additions and 78 deletions
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README.md
+5 -1
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@@ -27,7 +27,9 @@ Some other features included:
-auto-scale-allow-deny string
Path to config for server allowlists and denylists. If a global/server entry is specified, only players allowed to connect to the server will be able to trigger a scale up when -auto-scale-up is enabled or cancel active down scalers when -auto-scale-down is enabled (env AUTO_SCALE_ALLOW_DENY)
-auto-scale-asleep-motd string
MOTD to display when auto-scaled down servers are accessed; if empty, no status will be served (env AUTO_SCALE_ASLEEP_MOTD)
MOTD to display when auto-scaled down servers are accessed; if empty, no status will be served (env AUTO_SCALE_ASLEEP_MOTD)
-auto-scale-loading-motd string
MOTD to display while auto-scaled Docker servers are waking up; if empty, asleep status will be served (env AUTO_SCALE_LOADING_MOTD)
-auto-scale-down
Scale to zero after idle. For Kubernetes, decreases StatefulSet replicas from 1 to 0. For Docker, gracefully stops the container when there are no connections (env AUTO_SCALE_DOWN)
-auto-scale-down-after string
@@ -176,6 +178,7 @@ These are the labels scanned:
- `mc-router.auto-scale-down`: Per-container override to enable/disable auto scale down for Docker. When true (or left unspecified and the global `-auto-scale-down` flag is enabled), mc-router will stop this container after it has been idle for the configured `-auto-scale-down-after` duration.
- `mc-router.auto-scale-asleep-motd`: Per-container override for MOTD to show when container is scaled to zero. If empty or not set the host will
appear unresponsive.
- `mc-router.auto-scale-loading-motd`: Per-container override for MOTD to show while the container is waking and not yet reachable. If empty or not set, the global `-auto-scale-loading-motd` value is used.
#### Docker Auto Scale Up/Down
@@ -198,6 +201,7 @@ For usage with docker compose refer to the [examples/docker-autoscale/compose.ym
Behavior:
- When a client connects to a labeled hostname and the container is stopped or paused, mc-router will start/unpause it and wait until it becomes reachable (up to ~60s).
- While that wake-up is in progress and status pings are received, mc-router can return a loading MOTD (per-container override or `-auto-scale-loading-motd`).
- When no clients remain connected and the idle timer elapses (`-auto-scale-down-after`), mc-router gracefully stops the container.
Note: Docker Swarm discovery is supported; however, auto scale up/down is not yet supported for Swarm services.