Friday, August 7, 2015

VMware Tools does not start after updating the kernel in RHEL 6


VMware Tools does not start after updating the kernel in RHEL 6


Issue:

VMware Tools does not start after updating the kernel with boot log messages:

Checking acpi hot plug                                     [  OK  ]
Starting VMware Tools services in the virtual machine:
Switching to guest configuration:                       [  OK  ]
VM communication interface:                             [FAILED]
VM communication interface socket family:          [FAILED]
Guest operating system daemon:                         [  OK  ]

 

·         Vmware tools not running after kernel patches are installed

·         VMTool not working

·         After latest OS patch set installed VM coming up without NIC interfaces

·         After upgrading the kernel some of my devices no longer work

 

Environment

  • Red Hat Enterprise Linux (RHEL) 5 Virtual Machine
  • Red Hat Enterprise Linux (RHEL) 6 Virtual Machine
  • VMware ESX Hypervisor

 

Resolution

  • After updating the kernel, VMware tools just needs to be reconfigured -- not reinstalled
    Run the 
    vmware-config-tools.pl script (from inside the RHEL guest) to update the initramfs/initrd

# vmware-config-tools.pl

NOTE: There is a high possibility that running this script will interupt network services on the server; run it from the console during regularly-scheduled downtime to prevent problems with applications and users

Root Cause

  • In order for VMware-specific virtual hardware (e.g.: VMXNET3 ethernet controller) to work with a new kernel, initial ramdisk (initramfs in RHEL 6 and initrd in RHEL 5 & earlier) needs to be rebuilt to include the appropriate VMware-specific kernel modules (drivers)

Diagnostic Steps

  • Check for VMware specific hardware in the output of an lspci command

 

Saturday, March 28, 2015

Email Exchanging on Linux system using Sendmail+Dovecot+Squirrelmail
 
ØSend message from one computer to another computer using  Mail Server around the world.
ØThere are many servers are used to exchange these email  among one network to different network
ØMail server is responsible to send and receive mail from  one client   to another client.