Added support docker healthcheck (#42)

* added docker health check support

Author: BernardTolosajr

Dockerfile

@@ -7,5 +7,13 @@ RUN npm config set unsafe-perm=true
 RUN npm i -g macaca-datahub
 
 COPY ./entrypoint.sh /entrypoint.sh
+COPY ./healthcheck.js /healthcheck.js
+
+# Only run npm install if these files change.
+ADD ./package.json /package.json
+
+RUN npm install
+
+HEALTHCHECK CMD node /healthcheck.js || exit 1
 
 ENTRYPOINT ["/entrypoint.sh"]

healthcheck.js

@@ -0,0 +1,9 @@
+'use strict';
+
+const request = require('request');
+
+request('http://0.0.0.0:9200', error => {
+  if (error) {
+    throw error;
+  }
+});

package.json

@@ -20,6 +20,7 @@
     "macaca-logo": "^1.0.0",
     "mz": "^2.7.0",
     "npm-update": "^1.0.6",
+    "request": "^2.85.0",
     "semver": "^5.5.0",
     "socket.io": "^2.0.4",
     "sqlite3": "^3.1.13",