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fix(deploy): survive the MCP idle watchdog exit in the systemd unit 

The idle watchdog terminates the process with os._exit(0). systemd's
Restart=on-failure does not restart a unit that exits 0, so a server
installed from this template stops for good after the idle timeout
rather than restarting.

Switch the unit to Restart=always and disable the watchdog in the
server env template, since a dedicated always-on server is not the
per-session case the watchdog was added for.
This commit is contained in:
Dax Davis 2026-08-09 16:22:27 -05:00
parent 8516db7fbc
commit 351e62f736
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2 changed files with 11 additions and 1 deletions
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5
deploy/mempalace-server.service
View File

@ -24,7 +24,10 @@ User=mempalace
Group=mempalace Group=mempalace
EnvironmentFile=/etc/mempalace/server.env EnvironmentFile=/etc/mempalace/server.env
ExecStart=mempalace serve --host 0.0.0.0 --port 8765 ExecStart=mempalace serve --host 0.0.0.0 --port 8765
Restart=on-failure # The idle watchdog exits with status 0, which on-failure reads as an
# intentional stop, so the server would stay down. server.env disables the
# watchdog; Restart=always covers a deployment that has not set it.
Restart=always
RestartSec=2 RestartSec=2
# --- Hardening --------------------------------------------------------------- # --- Hardening ---------------------------------------------------------------

7
deploy/server.env.example
View File

@ -23,6 +23,13 @@ MEMPALACE_EMBEDDING_DEVICE=auto
# MEMPALACE_MCP_TLS_CERT=/etc/mempalace/tls/cert.pem # MEMPALACE_MCP_TLS_CERT=/etc/mempalace/tls/cert.pem
# MEMPALACE_MCP_TLS_KEY=/etc/mempalace/tls/key.pem # MEMPALACE_MCP_TLS_KEY=/etc/mempalace/tls/key.pem
# --- Server lifecycle -----------------------------------------------------------
# The MCP server exits by itself after this many idle hours (default 8) to free
# the ChromaDB/HNSW file handles that per-session stdio servers leave behind.
# A dedicated always-on server does not need that, so 0 disables it. Note that
# /healthz traffic does not count as activity; only MCP requests reset the timer.
MEMPALACE_MCP_IDLE_HOURS=0
# --- Palace location (systemd / bare-metal) ------------------------------------- # --- Palace location (systemd / bare-metal) -------------------------------------
# In Docker the palace lives on the mempalace-data volume by default. # In Docker the palace lives on the mempalace-data volume by default.
# MEMPALACE_PALACE_PATH=/var/lib/mempalace/palace # MEMPALACE_PALACE_PATH=/var/lib/mempalace/palace