Citrix

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

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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’, you encounter error message: Bringing up interface eth0: Device eth0 does not seem to be present, delaying initialization. [FAILED] You notice that Same error persists even when you add more NICs to the system Same error persists even when you remove or manually update MAC […]

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Networking

Setup or Migrate Bind Name Server Role on CentOS 6.8

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Scenario: You have a External Name Server configured on older and physical Linux box which you would like to migrate to CentOS host in a virtualized environment. The older Linux box running on Ubuntu 6.06 + BIND 9.3.2-P2.1.  You want to migrate it to a virtual machine running CentOS 6.8 + BIND 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6. OS and Postfix Version details of existing server: root@NSHost1:~# lsb_release -aNo LSB modules are available.Distributor ID: UbuntuDescription:    Ubuntu 6.06.2 LTSRelease:        6.06Codename:       dapperroot@NSHost1:~# root@NSHost1:~# named -vBIND 9.3.2-P2.1root@NSHost1:~# OS and Postfix Version details of new server: [root@DNSVM01 ~]# cat /etc/centos-releaseCentOS release 6.8 (Final)[root@DNSVM01 ~]# [root@DNSVM01 ~]# named -vBIND 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6[root@DNSVM01 […]