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Raise the service memory ceiling and record the new env vars #52

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Merged
lbesecker195 merged 1 commit into from
Sep 24, 2026
Merged

Raise the service memory ceiling and record the new env vars #52

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12 changes: 12 additions & 0 deletions deploy/.env.example
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Original file line number Diff line number Diff line change
Expand Up @@ -33,3 +33,15 @@ REGISTRY_PUBLISH_TOKEN=
# rather than blanking it.
SSA_ACCOUNT_ID=
SSA_PROJECT=mcp-registry

# Refuse requests that geolocate to a blocked city (McpRegistryWeb.Plugs.GeoBlock).
# The city database is ~180 MB resident, so check MemoryHigh in the service unit
# before enabling. Blank or false leaves the block inert and the site untouched.
GEO_BLOCK_ENABLED=true

# Asks remote listings what tools they expose (McpRegistry.Probe). These are
# other people's servers: 300 every five minutes at a concurrency of 6 is about
# 3,600 an hour, which clears ~21,000 endpoints in six hours without looking
# like a scan. PROBE_ENABLED=false stops it.
PROBE_BATCH_SIZE=300
PROBE_CONCURRENCY=6
14 changes: 10 additions & 4 deletions deploy/mcp-registry.service
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Expand Up @@ -13,10 +13,16 @@ ExecStartPre=/opt/mcp-registry/current/bin/migrate
ExecStart=/opt/mcp-registry/current/bin/server
Restart=on-failure
RestartSec=5
# This server is shared with other sites and has about 1 GB of memory.
# Cap the registry so it can never starve them.
MemoryHigh=300M
MemoryMax=400M
# The box is shared with other sites, so the registry gets a ceiling. It is a
# guard rail, not a squeeze: siblings run at 512M-768M and two are uncapped.
#
# Raised from 300M/400M on 2026-09-24. The old numbers were sized for a 1 GB
# host that has since been upgraded to 12 GB, and left roughly 87 MB of
# headroom -- enough that loading the geo-IP database pushed the BEAM through
# MemoryHigh into MemoryMax and stalled every database-backed request while
# routes touching no database kept answering.
MemoryHigh=768M
MemoryMax=1G
LimitNOFILE=65536
NoNewPrivileges=true
ProtectSystem=full
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