Add healthcheck to Docker image and example Compose file

Dockerfile

@@ -24,11 +24,17 @@ RUN ./scripts/build.sh
 # ============= Cleanup Stage ================
 FROM debian:11-slim AS execution
 
+# Install curl and jq to support healthchecks
+RUN apt update && apt install -y curl jq
+
 # Maintain compatibility with previous images
 RUN mkdir -p /avalanchego/build
 WORKDIR /avalanchego/build
 
 # Copy the executables into the container
 COPY --from=builder /build/build/ .
 
+COPY scripts/docker/healthcheck.sh .
+HEALTHCHECK --timeout=3s --start-period=1m CMD ./healthcheck.sh
+
 CMD [ "./avalanchego" ]

scripts/docker/docker-compose.yml

@@ -0,0 +1,23 @@
+version: "3.3"
+services:
+  autoheal:
+    image: willfarrell/autoheal:latest
+    container_name: autoheal
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    restart: unless-stopped
+  avalanchego:
+    image: avaplatform/avalanchego:latest
+    container_name: avalanchego
+    hostname: avalanchego
+    user: "9650"
+    labels:
+      autoheal: "true"
+    environment:
+      - HOME=/avalanchego
+    volumes:
+      - /home/avalanchego/.avalanchego:/avalanchego/.avalanchego
+    ports:
+      - 9650:9650
+      - 9651:9651
+    restart: unless-stopped

scripts/docker/healthcheck.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+function isBootstrapped() {
+    # Check the Info API:
+    # https://docs.avax.network/apis/avalanchego/apis/info/#infoisbootstrapped
+    BOOTSTRAPPED=$(curl --silent -X POST --data '{
+        "jsonrpc":"2.0",
+        "id"     :1,
+        "method" :"info.isBootstrapped",
+        "params": {
+            "chain":"'"${1}"'"
+        }
+    }' -H 'content-type:application/json;' 127.0.0.1:9650/ext/info | jq .result.isBootstrapped)
+
+    echo "${BOOTSTRAPPED}"
+}
+
+# Check the Health API:
+# https://docs.avax.network/apis/avalanchego/apis/health/
+HEALTHY=$(curl --silent -X POST --data '{
+    "jsonrpc":"2.0",
+    "id"     :1,
+    "method" :"health.health"
+}' -H 'content-type:application/json;' 127.0.0.1:9650/ext/health | jq .result.healthy)
+if [ "${HEALTHY}" = "true" ]; then
+    exit 0
+fi
+
+# Consider bootstrapping chains as healthy, even if the Health API says otherwise.
+if [ "$(isBootstrapped 'P')" = "false" ] || \
+   [ "$(isBootstrapped 'X')" = "false" ] || \
+   [ "$(isBootstrapped 'C')" = "false" ]; then
+    exit 0
+fi
+
+exit 1