dns failover service

1. Introduction1.1. Functions implemented: DNS resolution and intelligent forwarding1.2. Official documents:1.3. Basic concept: http://www.cnblogs.com/demonzk/p/6494968.html2. Environment:2.1. os:red Hat Enterprise Linux Server release 7.4 (Maipo)2.2. kernel:3.10.0-693.el7.x86_642.3. bind:9.9.4-51.el7_4.13. Installation:3.1. Operating system: (slightly)3.2. Configure Yum: (slightly)3.2. Install bindYum Install Bind3.3. Modify the configuration file"Li

Enter "Mount/dev/sr0/mnt" to mount the disc,Then enter "rpm-ivh/mnt/packages/bind-9.7.3-8.p3.el6.i686.rpm" To install the DNS service:After "vi/etc/named.conf" to view the global configuration file,Turn on the 53 port and match the IP address of the machine (IPv6 is temporarily unavailable, can be commented out by the # number),Change "localhost" to "any" to allow any user access:Then enter "Vi/etc/named.rfc1912.zones" to access the zone configuration

Installing RPM Packages[Email protected] extra]# Rpm-qa | grep "^bind"bind-chroot-9.8.2-0.17.rc1.el6_4.6.x86_64 Pseudo-root (optional)Main:Bind-libs-9.8.2-0.17.rc1.el6_4.6.x86_64Bind-utils-9.8.2-0.17.rc1.el6_4.6.x86_64Bind-9.8.2-0.17.rc1.el6_4.6.x86_64Install packagesYum install-y bind Bind-libs bind-utilsSee if the installation was successful![Email protected] dns]# Rpm-qa | grep "^bind"Bind-libs-9.8.2-0.17.rc1.el6_4.6.x86_64Bind-9.8.2-0.17.rc1.el6_4

How to solve the loss problem after Centos modifies DNS restart or restarts the network serviceRead directory introduction cause processing GitHub introduction when we configure Centos, we need to be able to connect to the Internet in many cases, so we need the DNS resolution function. By default, DNS information is not configured, so we have to configure

Refer to http://www.centoscn.com/CentosServer/dns/2014/0113/2355.html keepalive high-availability modeThis scheme is only suitable for small businesses, in the case of low-scale use, the resolution of a large amount of time or bind the best.If you add Local intranet own domain name hijacking resolution, simply add the parse record in the installed DNSMASQ/etc/hosts and restart DNSMASQ to take effect.Common Enterprise IT Support "5, intranet

server configuration is complete.8. Configuration forward parsingVim/etc/named.confAddZone "Redhat.com" in {Type master;File "Redhat.com.zone";};9. Add forward parsing configuration fileVim/var/named/redhat.com.zone$TTL 86400@ in SOA ns1.redhat.com. Admin.redhat.com. (2015010101; Serial1H; Refresh5M; Retry1W; Expire3H); MinimumIn NS ns1In MX ten MailNS1 in A 192.168.101.168Mail in A 192.168.101.10www in A 192.168.101.11www in A 192.168.101.12# License Related Documentschmod 640/var/named/redhat

Open, stop, restart service Sevices NSCD Start | Stop | Restart Cache db Files under/VAR/DB/NSCD Nscd-g View Statistics Clear Cache Nscd-i passwdNscd-i GroupNscd-i hosts Add: Turn on the NSCD cache service to speed up DNS resolution Here's the start: 1. Install NSCD yum install nscd 2. Modify the configuration file. To modify the

protected] ~]# service named ConfigtestStart[[Email protected] ~]# service named Startgenerating/etc/rndc.key: [OK]; random number generator Start ing named: [OK]View status[[Email protected] ~]# service named statusversion:9.8.2rc1-redhat-9.8.2-0.30.rc1.el6_6.3 software version CPUs found:1cpu number of workerThreads:1 worker thread number of zones:20 Zone are

About BindThe most widely used DNS server software now is bind (Berkeley Internet Name Domain), which was first written by a student at Berkeley University, and now the latest version is 9, with ISC (Internet Systems Consortium) written and maintained.Bind supports most of the first operating systems (Linux,unix,mac,windows)The name of the bind service is called namedDNS by default using UDP, TCP protocol,

from 61.135.169.125:icmp_seq=3 ttl=128 time=20.8 msUse the dig command:# Dig Www.baidu,com; ;; Global options: +cmd;; Got Answer:;; ->>header;; Flags:qr Rd RA; Query:1, Answer:1, Authority:1, additional:0;; QUESTION section:; www.baidu,com. In A;; ANSWER section:Www.baidu,com. 5 in A 220.250.64.26Display is normal.However, after the server restarts, the domain name can not be resolved, after analysis found that:In the/etc/sysconfig/network-scripts/ifcfg-eth0 filePeerdns=no # # #

Release date:Updated on: Affected Systems:TFTPD32 TFTPD32 4.00Description:--------------------------------------------------------------------------------Bugtraq id: 53704 Tftpd32 is a TFTP and DHCP server on Windows. A Denial-of-Service vulnerability exists in implementation of versions earlier than TFTPD32 4.00. the DNS server is bound to UDP port 53, but the domain option size is not verified. When sendi

Record Server Load balancer web Service requests based on DNS As a forum site: There are two types of data to be processed:1. structured data, such as user names and user comments, can be stored in relational databases. 2. unstructured data, such as attachments uploaded by users. Stored in the file system. Forum architecture: Use two httpd servers to serve users' access requests. Use the record of

DNS Service/etc/rndc. key was found solution after the dns service is configured in RHEL6, the following problems may occur. rndc cannot find the key, and the named service runs normally. In fact, it can also be used, however, based on the principle that one problem cannot b

NFS is a Web FileSystem network file system developed by Sun that is equivalent to a win mapped network drive that can "mount" a directory on an NFS server to a local directory on a local machine.The NFS configuration file is:/etc/exports [' eksp2rt] output, exportVi/etc/exports:/home/dir_to_exported clients_nfs (rw, sync and other sharing options)In fact, the configuration and use of NFS shares is the same as the idea and procedure of using smbclient or mount to make Linux share Windows shared

Domain Name Service (DNS) hosts are queried by domain names and IP addresses. DNS is a client-server system in which the domain name interpreter accesses the Domain Name Server to link the domain name with the IP address or other suitable hosts. Gnu c Library resolver (3) can also find IP addresses in files or through Network Information

It is easy to do a pan-resolution with the DNS service that Windows brings with it. But often novice directly add * 's host name can not add, thought not supported. The following provides a way for the DNS service with Windows to support pan-resolution. The following is an example of a test.com to ip:222.222.222.222.

*//installation bind service3.systemctl start Named.service//Start service4.NETSTAT-UTLNP | grep named//view service port5.RPM-QL bind-9.9.4-50.el7.x86_64//View the path generated during installation6.vim/etc/named.conf//Modify Master File7. Add a configuration area8. Depending on the version of the installation system, the reverse parsing file directory will change.Cd/var/namedCP Named.localhost Linuxma.com.zoneCP Named.localhost 192.168.227.zoneVim/

I found the following error when installing the DNS service for Linux 5 today![Root @ localhost server] # rpm-IVH bind-chroot-9.3.3-7.el5.i386.rpmWarning: bind-chroot-9.3.3-7.el5.i386.rpm: Header V3 DSA Signature: nokey, key ID 37017186Error: Failed dependencies:Bind = 30: 9.3.3-7. EL5 is needed by bind-chroot-9.3.3-7.el5.i386 This is mainly because the corresponding package is missing. If the system softwa

Today, when I was playing VMware, I ping www.baidu.com with the ping command, and the results show Unkown hosts www.baidu.com, but ping a certain IP is normal.Examples are as follows:[[email protected] ~]# Ping www.baidu.comPing:unknown Host Www.baidu.com[[email protected] ~]# Ping 119.29.25.60PING 119.29.25.60 (119.29.25.60) bytes of data.Bytes from 119.29.25.60:icmp_seq=1 ttl=128 time=41.9 msBytes from 119.29.25.60:icmp_seq=2 ttl=128 time=43.3 msBytes from 119.29.25.60:icmp_seq=3 ttl=128 time=

Affected Systems:Cisco IOS 15.xCisco IOS XE 3.xDescribe:--------------------------------------------------------------------------------Bugtraq id:70132CVE (CAN) id:cve-2014-3357Cisco IOS is the internetwork operating system used on most Cisco system routers and network switches.Cisco iOS 15.0, 15.1, 15.2, 15.4, iOS XE 3.3.xSE, 3.3.xXO, 3.5.xE, 3.11.xS a remote denial of service vulnerability exists on the implementation that could allow an attacker t