Setup and Test Bind DNS Zone File Replication to Slave Servers on CentOS

Scenario: You are on-boarding/bringing up a new Bind DNS server (say NSHost3 – to replace/upgrade your existing Bind DNS server (NSHost2 – You have installed Bind 9.8 as shown on the new server [root@NSHost3 ~]#  named -vBIND 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6_8.1[root@NSHost3 ~]# You want to configure NSHost3 as slave server for some of the zones are […]

FIX: CentOS 6.8 Minimal Install: Device eth0 does not seem to be present, delaying initialization

Scenario: You are running your CentOS virtual machine on XenServer with a Static IPv4 IP-Address. All of sudden your CentOS system loses network connectivity. Upon checking you notice that none of the Network adapters are detected.  The IP-address assigned gets allocated to other systems on the network. Upon attempting to run command ‘service network restart’, […]

VMWare Internals: Understanding how vMotion works

Understanding how vMotion works This is my first article on detailing VMWare Internals and in this article we discuss about how VMWare vMotion works and what happens in the background during the vMotion. About vMotion vMotion is one of the key feature of VMWare technology. vMotion is a live migration/movement of running Virtual Machines (VMs) […]

Functions of the Local Host Cache (LHC) in Citrix IMA

Information This article contains information on functions, refreshing, and recreating of the Local Host Cache (LHC). Functions of the Local Host Cache Each XenApp server stores a subset of the data store in the LHC. The LHC performs two primary functions: Permits a server to function in the absence of a connection to the data […]

FIX: Active Directory Replication errors: The RPC server is unavailable. Or The target principal name is incorrect. Or The Kerberos client received a KRB_AP_ERR_MODIFIED error.

Scenario: One of your Site Domain Controller went Out-of-Sync (unable to communicate) for 10-15 days with your PDC.  When you attempt to make replication from that server to the PDC, you’ll end receiving below error messages: REPADMIN /SHOWREPS, results in error “The target principal name is incorrect.” as shown below: C:\>REPADMIN /SHOWREPSHYD-Network\INDHYD-DC02DSA Options: IS_GCSite Options: […]

FIX: DNS Manager fails with error: Access was denied.

Scenario: When you launch DNS Manager console application on your local site Domain Controller server, it will result in below error message.  You notice this behaviour when your domain controller hasn’t communicated with your PDC for a long while (say for 10-15 days), you have your server restarted during this time. During this issue its […]

Fix: The following Domain Controller could not be contacted – A local error has occurred.

Scenario: You attempt to launch the Active Directory Management Console – Active Directory Domains and Trusts, on your domain controller in a different AD site,  you’ll be notified with the below error: —————————Active Directory Domain Services————————— The following Domain Controller could not be contacted: USA-DC01.mylab.lan. A local error has occurred. —————————OK—————————   Fix: If your […]