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; host and canonical name records mail IN CNAME ns1.

www IN A 192.168.1.100 ftp IN A 192.168.1.100 [[email protected] ~]# named-checkzone /var/named/for zone elinuxbook.com/IN: loaded serial 2010031403 OK [[email protected] ~]# named-checkzone /var/named/rev zone elinuxbook.com/IN: loaded serial 2010031402 OK [[email protected] ~]# yum -y install bind Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Install Process Loading mirror speeds from cached hostfile * base: centos.* extras: centos.* updates: centos.Resolving Dependencies -- Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: bind x86_64 32:9.8.2-0.47.rc1.el6_8.3 updates 4.0 M Updating for dependencies: bind-libs x86_64 32:9.8.2-0.47.rc1.el6_8.3 updates 890 k bind-utils x86_64 32:9.8.2-0.47.rc1.el6_8.3 updates 187 k Transaction Summary ================================================================================ Install 1 Package(s) Upgrade 2 Package(s) Total download size: 5.0 M Downloading Packages: (1/3): bind-9.8.2-0.47.rc1.el6_8.3.x86_64| 4.0 MB (2/3): bind-libs-9.8.2-0.47.rc1.el6_8.3.x86_64| 890 k B (3/3): bind-utils-9.8.2-0.47.rc1.el6_8.3.x86_64| 187 k B ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Total 130 k B/s | 5.0 MB Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Updating : 32:bind-libs-9.8.2-0.47.rc1.el6_8.3.x86_64 1/5 Updating : 32:bind-utils-9.8.2-0.47.rc1.el6_8.3.x86_64 2/5 Installing : 32:bind-9.8.2-0.47.rc1.el6_8.3.x86_64 3/5 Cleanup : 32:bind-utils-9.8.2-0.47.rc1.el6.x86_64 4/5 Cleanup : 32:bind-libs-9.8.2-0.47.rc1.el6.x86_64 5/5 Verifying : 32:bind-utils-9.8.2-0.47.rc1.el6_8.3.x86_64 1/5 Verifying : 32:bind-libs-9.8.2-0.47.rc1.el6_8.3.x86_64 2/5 Verifying : 32:bind-9.8.2-0.47.rc1.el6_8.3.x86_64 3/5 Verifying : 32:bind-libs-9.8.2-0.47.rc1.el6.x86_64 4/5 Verifying : 32:bind-utils-9.8.2-0.47.rc1.el6.x86_64 5/5 Installed: bind.x86_64 32:9.8.2-0.47.rc1.el6_8.3 Dependency Updated: bind-libs.x86_64 32:9.8.2-0.47.rc1.el6_8.3 bind-utils.x86_64 32:9.8.2-0.47.rc1.el6_8.3 Complete!

we have installed all required Packages, Now we need to configure the main configuration file of Slave/Secondary DNS Server i.e.

As Slave/Secondary DNS Server is a exact copy of the master DNS server, In case the Master/Primary Server becomes unavailable or server got down due to some reason, till the server gets up the Secondary DNS Server will accept the query without effecting the end user work.

Before configure the Slave/Secondary DNS Server we need to do some changes in our all Master/Primary DNS Server configuration files i.e.

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