Updating bind serial numbers automatically redhat

before you proceed with the installation and configuration of bind nameserver make sure that bind DNS server is exactly what you want.Default setup and execution of bind on Debian or Ubuntu may take around 200MB of RAM with no zones added to the config file.Short overview of the problem set and any back ground material or references one would need to understand the details. If the value of sn from the master DNS SOA is the same or LOWER then no zone transfer is initiated. If the sn value from the master is arithmetically HIGHER than that currently stored by the slave then a zone transfer (AXFR/IXFR) is initiated.NS2 acts as a backup if there are problems with NS1. [[email protected] ~]# rpm -qa bind* bind-libs-9.2.4-2 bind-utils-9.2.4-2 bind-9.2.4-2 [[email protected] ~]# nano /etc/nameserver 192.168.0.1 [[email protected] ~]# nano /etc/// // for Red Hat caching-nameserver // options ; // // a caching only nameserver config // controls ; zone "localhost" IN ; zone "yourdomain.com" IN ; zone "0.168.192.in-addr.arpa" IN ; include "/etc/rndc.key"; [[email protected] ~]# chmod 777 -Rvf /var/named/ mode of `/var/named/’ changed to 0777 (rwxrwxrwx) mode of `/var/named/named.zero’ changed to 0777 (rwxrwxrwx) mode of `/var/named/localhost.zone’ changed to 0777 (rwxrwxrwx) mode of `/var/named/data’ changed to 0777 (rwxrwxrwx) mode of `/var/named/named.local’ changed to 0777 (rwxrwxrwx) mode of `/var/named/named.ca’ changed to 0777 (rwxrwxrwx) mode of `/var/named/named.ip6.local’ changed to 0777 (rwxrwxrwx) mode of `/var/named/localdomain.zone’ changed to 0777 (rwxrwxrwx) mode of `/var/named/named.broadcast’ changed to 0777 (rwxrwxrwx) mode of `/var/named/slaves’ changed to 0777 (rwxrwxrwx) [[email protected] ~]# service named restart Stopping named: [ OK ] Aug 3 server named[9362]: listening on IPv4 interface venet0:0, 192.168.0.2#53 Aug 3 server named[9362]: command channel listening on 127.0.0.1#953 Aug 3 server named[9362]: zone localhost/IN: loaded serial 42 Aug 3 server named[9362]: running Aug 3 server named[9362]: zone yourdomain.com/IN: transferred serial 100 Aug 3 server named[9362]: transfer of ‘yourdomain.com/IN’ from 192.168.0.1#53: end of transfer Aug 3 server named[9362]: zone yourdomain.com/IN: sending notifies (serial 100) Aug 3 server named[9362]: zone 0.168.192.in-addr.arpa/IN: transferred serial 100 Aug 3 server named[9362]: transfer of ‘0.168.192.in-addr.arpa/IN’ from 192.168.0.1#53: end of transfer Aug 3 server named[9362]: zone 0.168.192.in-addr.arpa/IN: sending notifies (serial 100) [[email protected] ~]# nslookup Server: 192.168.0.1 Address: 192.168.0.1#53 Name: Address: 192.168.0.1 answered from nslookup used server from NS1 with IP 192.168.0.1 Now we can try to deactivate NS1 to see if name resolution is still working.[[email protected] ~]# cat /etc/nameserver 192.168.0.1 nameserver 192.168.0.2 This domain is using NS2 because NS1 is not active. Even the comments in those files tell you not to do it !

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Sample scenario notes to help you ready this DNS bind howto:dnsutils is not compulsory package to run bind webserver, but we will use a dig command which is part of this package as a testing tool of your bind configuration. This IP address is used in case that a local DNS server do not know the answer the a name resolution query.

Oracle does not recommend an upgrade from earlier major versions of Oracle Linux even though anaconda provides an option to do this upgrade.

A fresh installation is strongly recommended rather than a system upgrade between major versions.

For the latest updates please refer to the online version of these release notes available at: NOTE: An upgrade of Oracle Linux from a beta release is not supported.

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Further, an in-place upgrade between major versions of Oracle Linux is not supported.

A slave (Secondary) DNS server will read the master DNS SOA record periodically, either on expiry of refresh (defined below) or when it receives a NOTIFY and compares arithmetically its current value of sn with that received from the master DNS.

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