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fix(backups): GOMEMLIMIT so a two-database backup run fits the 512 MiB cap #108

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Merged
jayleaton merged 1 commit into from
Oct 23, 2026
Merged

fix(backups): GOMEMLIMIT so a two-database backup run fits the 512 MiB cap #108

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6 changes: 6 additions & 0 deletions apps/backup/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,12 @@ RUN CGO_ENABLED=0 go build -trimpath -ldflags='-s -w' -o /out/backup ./apps/back
FROM postgres:18-alpine
COPY --from=build /out/backup /usr/local/bin/backup
ENV APP_ENV=production
# Each database's age scrypt step (packages/backup, work factor 18) allocates
# ~256 MiB that is garbage right after. Without a soft limit the GC lets the
# next database's allocation stack on it, and the 512 MiB container cap
# (deploy/platform/graph.go) kills the run on the second database. The limit
# makes the GC reclaim first; keep it below that cap.
ENV GOMEMLIMIT=384MiB
USER postgres
WORKDIR /tmp
# The postgres image's entrypoint would start a server: reset it. People run
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2 changes: 1 addition & 1 deletion deploy/platform/graph.go
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Expand Up @@ -260,7 +260,7 @@ func (config Config) backups(env string, appURL, adminURL map[string]any) []any
if adminURL != nil {
vars["ADMIN_DATABASE_URL"] = adminURL
}
const backupMemoryMB = 512 // pg_dump of a large table
const backupMemoryMB = 512 // pg_dump of a large table; apps/backup/Dockerfile GOMEMLIMIT stays below it
sc := railway.ServiceConfig{
"build": map[string]any{
"builder": "DOCKERFILE",
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