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　　Preface:online casino cheats and The latest entrance

　　Basic of BIND domain name service

　　The role and type of DNS system, the installation and configuration file of BIND, using BIND to build domain name servers

　　Build cache domain name server, build master and slave domain name servers

　　Key steps: find the main configuration file, find the startup script

　　IP resolves domain names, mostly used for testing

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　　www.sina.com.cn. The last point is the root, and the whole is a fully qualified domain name

　　www is the host name, sina is the second-level domain, com.cn is the top-level domain, . is the root

　　Also known as a caching server, it caches the domain->IP address records obtained by querying other domain name servers locally, improving the speed of repeated queries

　　It is the cache server when the service is installed

　　Master server is the official server of a specific DNS zone, with uniqueness responsible for maintaining all domain->IP address mapping records within the zone

　　Slave server, also known as auxiliary domain name server, maintains the domain->IP address records, derived from the primary domain name server

　　BIND (Berkeley Internet Name Daemon)

　　Berkeley Internet Domain Service, related software packages

　　bind-9.9.4-37.el7.x86_64.rpm, bind-untils-9.9.4-37.el7.x86_64.rpm, bind-libs-9.9.4-37.el7.x86_64.rpm, bind-chroot-9.9.4-37.el7.x86_64.rpm

　　Main executable program: /usr/sbin/named, default listening port: 53, TCP is responsible for connection control, UDP is responsible for fast resolution, the main configuration file: /etc/bind/named.conf, the data file saving DNS resolution records is located at /var/named/

　　Global configuration part

　　Global parameters of the DNS server, including listening address/port, default location of data files, etc., using the configuration section of options { … };

　　Part of the zone configuration /etc/named.rfc1912.zonesonline casino method and The latest plan

　　The specific DNS domain that this server provides domain resolution includes domain name, server role, data file name, etc., using the configuration section of zone “zone name” IN { … };

　　16.16.173.in-addr.arpa is the reverse of an IP address, the positive writing is ‘173.16.16.?’, ‘?’ as an option

　　3.4.1 Global TTL configuration item and SOA record under the /var/named/ directory

　　$TTL (Time To Live, Survival Time) records the SOA (Start of Authority, Authority Information Start) record, the part starting with the semicolon ‘;’ is for comment information

　　If the primary server cannot be found, it will look for it every 1 hour, and continue for 1w, that is, one week

　　3.4.2 Domain resolution record

　　NS domain name server (Name Server) record MX mail exchange (Mail Exchange) record A address (address) record, only used in the forward resolution zone CNAME alias (Canonical Name) record

　　The boundary of the ipv6 reverse resolution zone is the forward resolution zone above, and the reverse resolution zone below

　　@ represents a variable, here referring to the domain name

　　At this point, the DNS forward resolution has been configured

　　Verify

　　Create a new virtual machine, set the network card mode to nat mode, and then specify the dns

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