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 – 198.164.12.103) to replace/upgrade your existing Bind DNS server (NSHost2 – 198.164.12.102) 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 […]

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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’, […]

Setup or Migrate Postfix SMTP relay server on CentOS 6.5

Scenario: You have a External SMTP relay host 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 + Postfix 2.2.10.  You want to migrate it to a virtual machine running CentOS 6.5 + Postfix 2.6.6. OS […]

Setup or Migrate Bind Name Server Role on CentOS 6.8

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 […]

Configuring On-Premise Linux Postfix SMTP Relay Server to Communicate with Office 365 SMTP Relay for email delivery

Scenario:   You have various automation and reporting solutions setup that use an On-Premise Linux Postfix SMTP Servers and relays all the automated email through your On-Premise Exchange server.  You are migrating your Microsoft Exchange from On-Premise Exchange server to Office 365.  You are now required to configure all your On-Premise Linux Postfix SMTP Servers […]

Mounting Windows Share in Linux

  [root@dev webinst02]# mkdir -p /mnt/lacie [root@dev webinst02]# mount -t cifs //172.24.101.22/Public$ -o username=domadmin /mnt/lacie Password: [root@dev webinst02]# cd /mnt/lacie [root@dev lacie]# ls 172.24.101.22               2010oct                    ffgfd                                 Menu                   test 2011_tutorials             Final                                 New Text Document.txt  tomcatlogsbackup [root@dev lacie]#