Add Docker Healthcheck

Fixes #635

.gitattributes

@@ -0,0 +1,11 @@
+###############################################################################
+# Set default behavior to automatically normalize line endings.
+###############################################################################
+* text=auto
+
+###############################################################################
+# behavior for Unix scripts
+#
+# Unix scripts are treated as binary by default.
+###############################################################################
+*.sh   eol=lf

Dockerfile

@@ -5,6 +5,7 @@ VOLUME /data
 WORKDIR /data
 EXPOSE 80
 ENTRYPOINT ["/bin/bash", "/usr/src/app/run.sh"]
+HEALTHCHECK CMD node /usr/src/app/src/healthcheck.js
 
 RUN apt-get -qq update \
 && DEBIAN_FRONTEND=noninteractive apt-get -y install \

Dockerfile_light

@@ -5,6 +5,7 @@ EXPOSE 80
 VOLUME /data
 WORKDIR /data
 ENTRYPOINT ["node", "/usr/src/app/", "-p", "80"]
+HEALTHCHECK CMD node /usr/src/app/src/healthcheck.js
 
 RUN mkdir -p /usr/src/app
 COPY / /usr/src/app

src/healthcheck.js

@@ -0,0 +1,18 @@
+var http = require("http");
+var options = {
+  timeout: 2000,
+};
+var url = "http://localhost:80/health";
+var request = http.request(url, options, (res) => {
+  console.log(`STATUS: ${res.statusCode}`);
+  if (res.statusCode == 200) {
+    process.exit(0);
+  } else {
+    process.exit(1);
+  }
+});
+request.on("error", function (err) {
+  console.log("ERROR");
+  process.exit(1);
+});
+request.end();