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feat(entrypoint): Refactor entrypoint for leadership-aware process management and clean up register.sh

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sstent
2026-02-08 13:59:37 -08:00
parent e9b26f6eb9
commit 9cd5455378
3 changed files with 76 additions and 80 deletions
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3
Dockerfile
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@@ -12,9 +12,8 @@ RUN apk add --no-cache fuse3 ca-certificates bash curl
COPY --from=litefs /usr/local/bin/litefs /usr/local/bin/litefs
# Copy scripts
COPY register.sh /usr/local/bin/register.sh
COPY entrypoint.sh /usr/local/bin/entrypoint.sh
RUN chmod +x /usr/local/bin/register.sh /usr/local/bin/entrypoint.sh
RUN chmod +x /usr/local/bin/entrypoint.sh
# Copy LiteFS configuration
COPY litefs.yml /etc/litefs.yml

80
entrypoint.sh
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@@ -1,8 +1,78 @@
#!/bin/bash
set -e
# Start the registration loop in the background, redirecting output to stderr so we see it in Nomad logs
/usr/local/bin/register.sh >&2 &
# Configuration from environment
SERVICE_NAME="navidrome"
PORT=4533
CONSUL_HTTP_ADDR="${CONSUL_URL:-http://localhost:8500}"
NODE_IP="${ADVERTISE_IP}"
# Start Navidrome
echo "Starting Navidrome..."
/app/navidrome
# Tags for the Primary service (Traefik enabled)
PRIMARY_TAGS='["navidrome","web","traefik.enable=true","urlprefix-/navidrome","tools","traefik.http.routers.navidromelan.rule=Host(`navidrome.service.dc1.consul`)","traefik.http.routers.navidromewan.rule=Host(`m.fbleagh.duckdns.org`)","traefik.http.routers.navidromewan.middlewares=dex@consulcatalog","traefik.http.routers.navidromewan.tls=true"]'
NAVIDROME_PID=""
SERVICE_ID="navidrome-${NODE_IP}-${SERVICE_NAME}"
cleanup() {
echo "Caught signal, shutting down..."
if [ -n "$NAVIDROME_PID" ]; then
echo "Stopping Navidrome (PID: $NAVIDROME_PID)..."
kill -TERM "$NAVIDROME_PID"
wait "$NAVIDROME_PID" || true
fi
echo "Deregistering service ${SERVICE_ID} from Consul..."
curl -s -X PUT "${CONSUL_HTTP_ADDR}/v1/agent/service/deregister/${SERVICE_ID}" || true
exit 0
}
trap cleanup SIGTERM SIGINT
echo "Starting leadership-aware entrypoint..."
echo "Node IP: $NODE_IP"
echo "Consul: $CONSUL_HTTP_ADDR"
while true; do
# In LiteFS 0.5, .primary file exists ONLY on replicas.
if [ ! -f /data/.primary ]; then
# PRIMARY STATE
if [ -z "$NAVIDROME_PID" ] || ! kill -0 "$NAVIDROME_PID" 2>/dev/null; then
echo "Node is Primary. Initializing Navidrome..."
# Register in Consul
echo "Registering as primary in Consul..."
curl -s -X PUT -d "{
\"ID\": \"${SERVICE_ID}\",
\"Name\": \"${SERVICE_NAME}\",
\"Tags\": ${PRIMARY_TAGS},
\"Address\": \"${NODE_IP}\",
\"Port\": ${PORT},
\"Check\": {
\"HTTP\": \"http://${NODE_IP}:${PORT}/app\",
\"Interval\": \"10s\",
\"Timeout\": \"2s\"
}
}" "${CONSUL_HTTP_ADDR}/v1/agent/service/register"
# Start Navidrome
/app/navidrome &
NAVIDROME_PID=$!
echo "Navidrome started with PID $NAVIDROME_PID"
fi
else
# REPLICA STATE
if [ -n "$NAVIDROME_PID" ] && kill -0 "$NAVIDROME_PID" 2>/dev/null; then
echo "Node transitioned to Replica. Stopping Navidrome..."
kill -TERM "$NAVIDROME_PID"
wait "$NAVIDROME_PID" || true
NAVIDROME_PID=""
echo "Deregistering primary service from Consul..."
curl -s -X PUT "${CONSUL_HTTP_ADDR}/v1/agent/service/deregister/${SERVICE_ID}" || true
fi
# We don't register anything for replicas in this version to keep it simple.
# But we stay alive so LiteFS keeps running.
fi
sleep 5
done

73
register.sh
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@@ -1,73 +0,0 @@
#!/bin/bash
set -x
# Configuration
SERVICE_NAME="navidrome"
REPLICA_SERVICE_NAME="replica-navidrome"
PORT=4533
CONSUL_HTTP_ADDR="${CONSUL_URL:-http://localhost:8500}"
NODE_IP="${ADVERTISE_IP}"
CHECK_INTERVAL="10s"
# Tags for the Primary service (Traefik enabled)
PRIMARY_TAGS='["navidrome","web","traefik.enable=true","urlprefix-/navidrome","tools","traefik.http.routers.navidromelan.rule=Host(`navidrome.service.dc1.consul`)","traefik.http.routers.navidromewan.rule=Host(`m.fbleagh.duckdns.org`)","traefik.http.routers.navidromewan.middlewares=dex@consulcatalog","traefik.http.routers.navidromewan.tls=true"]'
# Tags for the Replica service
REPLICA_TAGS='["navidrome-replica"]'
register_service() {
local name=$1
local tags=$2
local id="navidrome-${NODE_IP}-${name}"
echo "Registering as ${name} with ID ${id} at ${NODE_IP}:${PORT}..."
curl -v -X PUT -d "{
\"ID\": \"${id}\",
\"Name\": \"${name}\",
\"Tags\": ${tags},
\"Address\": \"${NODE_IP}\",
\"Port\": ${PORT},
\"Check\": {
\"HTTP\": \"http://${NODE_IP}:${PORT}/app\",
\"Interval\": \"${CHECK_INTERVAL}\",
\"Timeout\": \"2s\"
}
}" "${CONSUL_HTTP_ADDR}/v1/agent/service/register"
}
deregister_service() {
local name=$1
local id="navidrome-${NODE_IP}-${name}"
echo "Deregistering ${name} with ID ${id}..."
curl -v -X PUT "${CONSUL_HTTP_ADDR}/v1/agent/service/deregister/${id}"
}
echo "Starting Consul registration loop..."
LAST_STATE="unknown"
while true; do
# In LiteFS 0.5, .primary file exists ONLY on replicas.
# We check /data/.primary because /data is our mount point.
if [ ! -f /data/.primary ]; then
CURRENT_STATE="primary"
else
CURRENT_STATE="replica"
fi
echo "Current node state: ${CURRENT_STATE}"
if [ "$CURRENT_STATE" != "$LAST_STATE" ]; then
echo "State change detected: ${LAST_STATE} -> ${CURRENT_STATE}"
if [ "$CURRENT_STATE" == "primary" ]; then
deregister_service "$REPLICA_SERVICE_NAME"
register_service "$SERVICE_NAME" "$PRIMARY_TAGS"
else
deregister_service "$SERVICE_NAME"
register_service "$REPLICA_SERVICE_NAME" "$REPLICA_TAGS"
fi
LAST_STATE="$CURRENT_STATE"
fi
sleep 15
done