Dynamic Domain name resolution making

Shutting down the firewall on the server, desktop host

Firewall-cmd--permanent--add-server=dns

Firewall-cmd--reload

Vim/etc/named.conf

Set slave on the desktop host and set masters on the server

Vim/etc/named.conf

Vim/etc/namewd.rfc1912.zones

Systemctl Start named

Vim/etc/resolv.conf

Note: When setting the domain name resolution address, server and desktop each write their own IP

NameServer 172.25.254.150

When you set slave DNS to update, you need to turn on permissions for DNS files in the server

chmod 770/var/named

Vim/etc/named.rfc1912.zones

Nsupdate /* Remote update DNS domain name configuration

>server 172.25.254.150

>update Delete www.westos.com

>send

>server 172.25.254.150

>update add www.westos.com 86400 A 172.25.254.111

>send

>quit

If the DNS content update fails refuse is not given file permissions, Servfail is usually a firewall is not closed

Set key authentication DNS, this setting ensures the security of DNS

Dnssec-keygen-a hmac-md5-b 128-n HOST westos/*-a encryption algorithm,-B encryption length,-N encryption owner type

Cp-p/etc/rndc.key/etc/westos.key/* Copy encrypted files to generate your own encrypted files

Vim/etc/westos.key/* Add new encryption characters to the encrypted file, note modify the file header name

vim/etc/named.conf/* Add key Authentication file

Vim/etc/named.rfc1912.zones/* Allow DNS updates to be changed to key authentication

SCP kwestos.*******.* [Email protected]:/mnt/* Send key to specified IP location

Nsupdate-k-kwestos.******.private/* Login with key

Dynamic Domain name analysis of peanut shell

1. Installing the DHCP service

Yum Install Dhcp-y

Cp-p/usr/share/doc/dhcp-4.2.5/dhcpd.conf.example/etc/dhcp/dhcpd.conf

2. Edit the DHCP file to associate DNS with DHCP

Option Domain-name "westos.com";

Option Domain-name-servers 172.25.254.150;

Ddns-update-style Interim;/* This is how dynamic DNS is updated

Subnet 172.25.254.0 netmask 255.255.255.0 {

Range 172.25.254.220 172.25.254.230;

Optiaon routers 172.25.254.150;

}

Key Westos {/* Update key

Algorithm HMAC-MD5;

Select ****************;

};

Zone westos.com. {/* This is to update zone, if this is the DNS server,primary write primary 127.0.0.1; 127.0.0.1 If the other machine is DNS server, write the IP of that machine.

Key Westos;

}

3. Test whether the DNS of the local computer can be automatically resolved with the client

Hostnamectl Set-hostname 666.westos.com

Dynamic Domain name resolution making