Nginx Healthcheck endpoint + Dockerfile healthcheck (#23)

Co-authored-by: modem7 <modem7@gmail.com>

CHANGELOG.md

@@ -4,6 +4,15 @@ All notable changes to this package will be documented in this file.
 
 The format is based on [Keep a Changelog][keepachangelog] and this project adheres to [Semantic Versioning][semver].
 
+## v1.8.0
+
+### Added
+
+- Nginx health-check endpoint (`/health/live`) and dockerfile `HEALTHCHECK` to utilise (thx [@modem7](https://github.com/modem7)) [#22], [#23]
+
+[#22]:https://github.com/tarampampam/error-pages/pull/22
+[#23]:https://github.com/tarampampam/error-pages/pull/23
+
 ## v1.7.2
 
 ### Changed

Dockerfile

@@ -30,7 +30,7 @@ RUN set -x \
     && mv /src/docker/nginx-server.conf ./etc/nginx/conf.d/default.conf
 
 # Image page: <https://hub.docker.com/_/nginx>
-FROM nginx:1.21-alpine as runtime
+FROM nginx:1.21.1-alpine as runtime
 
 LABEL \
     # Docs: <https://github.com/opencontainers/image-spec/blob/master/annotations.md>
@@ -44,4 +44,9 @@ LABEL \
 # Import from builder
 COPY --from=builder /tmp/rootfs /
 
+# Docs: <https://docs.docker.com/engine/reference/builder/#healthcheck>
+HEALTHCHECK --interval=15s --timeout=2s --retries=2 --start-period=2s CMD [ \
+    "wget", "--spider", "-q", "http://127.0.0.1:8080/health/live" \
+]
+
 RUN chown -R nginx:nginx /opt/html

docker/nginx-server.conf

@@ -19,6 +19,13 @@ server {
     root /opt/html;
   }
 
+  # Health-check (liveness probe)
+  location = /health/live {
+    access_log off;
+    default_type text/plain;
+    return 200 "healthy\n";
+  }
+
   location / {
     try_files $uri =404;
   }