Following is a good article which worked successfully to connect Centos7 to Active Directory for users in AD to be able to login to Centos. Manually Connecting an SSSD Client to an Active Directory Domain https://access.redhat.com/articles/3023951 Another useful testing procedures blog: QA:Testcase Active Directory Setup https://fedoraproject.org/wiki/QA:Testcase_Active_Directory_Setup Realmd and SSSD Active Directory Authentication https://outsideit.net/realmd-sssd-ad-authentication/ … Continue reading Manually Connecting an SSSD Client to an Active Directory Domain
Some Wireshark filter fields match against multiple protocol fields. For example, "ip.addr" matches against both the IP source and destination addresses in the IP header. The same is true for "tcp.port", "udp.port", "eth.addr", and others. It's important to note that ip.addr == 10.43.54.65 is equivalent to ip.src == 10.43.54.65 or ip.dst == 10.43.54.65 This can be counterintuitive in some cases. … Continue reading Wireshark commands
Common Kerberos commands: 1.Change password of a principal(user) $ kadmin.local kadmin.local: cpw <principalname> Enter password for princal "principalname@REALM.COM": 2.initialize a kerberos ticket $ kinit <principalname> To get detailed verbose info use below options: $ KRB5_TRACE=/dev/stdout kinit -V 3. Destroy the current ticket: $ kdestroy 4. Check the status of Kerberos KDC $ systemctl status kadmin $ systemctl … Continue reading Kerberos commands
The following blog shows how to access a kerberized hadoop cluster from a Chrome browser in laptop. https://community.hortonworks.com/articles/28537/user-authentication-from-windows-workstation-to-hd.html This will work mostly except change the below: 3. network.negotiate-auth.gsslib = C:\Program Files\MIT\Kerberos\bin\gssapi64.dll instead of the gssapi32.dll since we mostly use 64-bit Firefox which doesnt work with the 32bit dll.
This blog will show how to download Windows Server 2012R2 180days evaluation and create a VM using Virtualbox VHD. Reference: http://www.sysprobs.com/download-windows-server-2012-r2-vhd-on-virtualbox-vmware-workstation First download the VHD file from Microsoft website. Make sure to select the VHD option: https://www.microsoft.com/en-us/evalcenter/evaluate-windows-server-2012-r2 NOTE: Once you use this VHD file to create a VM then this file cannot be used again … Continue reading Install Windows Server 2012R2 using Virtualbox VHD
Following steps are needed to run a Java program in Hadoop with Kerberos security enabled: 1. Create a text file named FileCount.java and store it in your home directory such as /home/userid 2. Copy paste the below code into the file FileCount.java . Change the hadoop hostname from quickstart.cloudera:8020 to the correct host. import java.io.*; import … Continue reading Run a Java program in Hadoop with Kerberos enabled.
SPNEGO, and WebHDFS on Hadoop using Chrome browser: Reference: http://www.ghostar.org/2015/06/google-chrome-spnego-and-webhdfs-on-hadoop/ We want to see if the Chrome browser can be used to authenticate users with Kerberos and display Hadoop webhdfs REST api data. In the Cloudera Security .pdf manual follow these steps: Step 9: (Optional) Enable Authentication for HTTP Web Consoles for Hadoop Roles … Continue reading Kerberos, SPNEGO and WebHDFS on Hadoop using Chrome browser:
If you have a Centos server and want to install Chrome browser which will display GUI on Windows laptop using X server then follow these steps: First download and install Mobax terminal software on your laptop from https://mobaxterm.mobatek.net/ . This will provide the X server needed to display the browser on windows. Enable Google YUM … Continue reading Install Google Chrome on Centos 7
Reference: http://blog.cloudera.com/blog/2015/03/how-to-quickly-configure-kerberos-for-your-apache-hadoop-cluster/ Cloudera Security manual .pdf – CDH 5.15 on Cloudera Documentation website http://www.ghostar.org/2015/06/google-chrome-spnego-and-webhdfs-on-hadoop/ https://www.youtube.com/watch?v=4TwU0LwDJAg Environment: Cloudera CDH 5.15 on Centos 7 MIT KDC Kerberos Setting up Kerberos in Cloudera CDH is somewhat tricky. The above blog is a good step by step way to setup. Also refer to the official Cloudera Security … Continue reading Kerberos setup in Cloudera Hadoop
Virtualbox network setup for internet access: Generally the following table gives the connectivity for different Virtualbox Network adapters. Sometimes it is possible the Bridged network wont get an ipv4 address and cannot connect to internet. Then we have to setup both a NAT and a Host-only adapter network. The requirement is: Host is Windows 10, … Continue reading Virtualbox VM setups.