Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/6377#discussion_r203990327
--- Diff:
flink-end-to-end-tests/test-scripts/docker-hadoop-secure-cluster/README.md ---
@@ -0,0 +1,118 @@
+# Apache Hadoop Docker image with Kerberos enabled
+
+This image is modified version of Knappek/docker-hadoop-secure
+ * Knappek/docker-hadoop-secure
<https://github.com/Knappek/docker-hadoop-secure>
+
+With bits and pieces added from Lewuathe/docker-hadoop-cluster to extend
it to start a proper kerberized Hadoop cluster:
+ * Lewuathe/docker-hadoop-cluster
<https://github.com/Lewuathe/docker-hadoop-cluster>
+
+And a lot of added stuff for making this an actual, properly configured,
kerberized cluster with proper user/permissions structure.
+
+Versions
+--------
+
+* JDK8
+* Hadoop 2.8.3
+
+Default Environment Variables
+-----------------------------
+
+| Name | Value | Description |
+| ---- | ---- | ---- |
+| `KRB_REALM` | `EXAMPLE.COM` | The Kerberos Realm, more information
[here](https://web.mit.edu/kerberos/krb5-1.12/doc/admin/conf_files/krb5_conf.html#)
|
+| `DOMAIN_REALM` | `example.com` | The Kerberos Domain Realm, more
information
[here](https://web.mit.edu/kerberos/krb5-1.12/doc/admin/conf_files/krb5_conf.html#)
|
+| `KERBEROS_ADMIN` | `admin/admin` | The KDC admin user |
+| `KERBEROS_ADMIN_PASSWORD` | `admin` | The KDC admin password |
+
+You can simply define these variables in the `docker-compose.yml`.
+
+Run image
+---------
+
+Clone the [Github
project](https://github.com/aljoscha/docker-hadoop-secure-cluster) and run
--- End diff --
fixing
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