如何替H2O Flow 設定密碼

解決方法：

Step 1: 先在命令列產生密碼MD5值

$ java -cp /opt/pkg/sparkling-water/sparkling-water/assembly/build/libs/sparkling-water-assembly-1.5.16-all.jar org.eclipse.jetty.util.security.Password <USER> <PASSWORD>

<USER>
OBF:1l8b1j1y1m0t1ino1ikq1lxd1iyw1l4z
MD5:82b0f7a9773cd3fdc85a73d1996031ce
CRYPT:ogbYa6OLGzH.o

Step 2: 新增一個password檔案，請依實際使用之USER與產生之md5，以下列格式存放

<USER>:MD5:c576ac184359cd3b87a7845ecf15956f

Step 3: 使用 --conf spark.ext.h2o.hash.login=true 與 --conf spark.ext.h2o.login.conf=/path_to/password 指定Step 2產生之密碼檔

$ sparkling-shell --conf spark.ext.h2o.hash.login=true --conf spark.ext.h2o.login.conf=/path_to/password

Step 4: 此時啟動H2O Flow，即會出現輸入帳號密碼之訊息

參考資料：

http://s3.amazonaws.com/h2o-release/h2o/master/3480/docs-website/h2o-docs/index.html#Security-Authentication-Hash%20file%20authentication-Hash%1E%20file%20H2O-server%20side

http://s3.amazonaws.com/h2o-release/h2o/master/3480/docs-website/h2o-docs/index.html#Security-Authentication-Hash%20file%20authentication-Hash%1E%20file%20H2O-server%20side-Sparkling%20Water

https://wiki.eclipse.org/Jetty/Howto/Secure_Passwords