Add healthcheck.

Author: devoply

Dockerfile

@@ -116,6 +116,8 @@ RUN sed -i "s/nginx:x:100:101:nginx:\/var\/lib\/nginx:\/sbin\/nologin/nginx:x:10
 
 EXPOSE 80
 
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 CMD curl -fsS http://127.0.0.1/health || exit 1
+
 VOLUME ["/DATA"]
 
 CMD ["/usr/bin/s6-svscan", "/etc/s6"]

rootfs/etc/nginx/host.conf

@@ -5,6 +5,13 @@ index index.html index.htm;
 
 disable_symlinks off;
 
+# Simple health endpoint always returns 200 OK
+location = /health {
+  access_log off;
+  default_type text/plain;
+  return 200 'OK';
+}
+
 location / {
   try_files $uri $uri/;
 }