How to Trouble-Shoot DNS problems in three easy steps

Solving the problems of DNS is a common challenge for web developers who just may have been exposed to the challenges that the code and databases. If you set up domains on a dedicated server or VPS for the first time and the next challenges will help.

1) The name servers are set for a domain on the domain registrar. To see what name servers are set to control betterwhois.com domain (or another service whois). For example, the domainRackspace domain.info may return the name server DNS1 and dns2.stabletransit.net.

2) In the name of the correct DNS server entries must be established. A "voice", which is normally set to a host name, will have fields like name and IP. For example, as the name and 174.143.155.XX subdomain.domain.info as IP. The IP-IP is the server. You can trouble shoot using: zoneedit.com / lookup.html (linux if you can also use the nslookup command).

Name serversApplications may be brought in the name server. In case of companies such as web hosting server iweb.ca name is hosted on the same server as web server, so that when an account is created in WHM DNS entries are set automatically. If DNS is hosted Rackspace separately so that we have to manually set a DNS entry in their name servers. To Prevent the creation of a large number of entries for each subdomain, asabc.domain.info, def.lbclients.info and so on, received a wildcard for domain.info be established. Then each subdomain will point to the IP of choice (such as VPS).

Again, if you type in your car before subdomain.domain.info find the nameservers for domain.info, check the hostname in the server name, to retrieve from the server IP, and now the final stage: how the server know which directory on the server under the usera?

3) In the case of a Linux server, the httpd.conf file (/ etc / httpd / conf) tells the server where the server where the site can be found. This file contains a series of "virtual hosts". And 'because many so called virtual hosts can be assigned to the same IP (Lange tijd back was not possible in Web server software, but Naam Elke nodig an IP host part). Each virtual machine directive tells the web server where you uploadfile for a particular host name (server name or aliases).

This virtual host directives are automatically created when you create an account in WHM, adding a parked or add-on domain. You can shoot problems watching the httpd.conf file via SSH (pico / etc / httpd / httpd.conf) and looking for the server name or nickname.

Conclusion: If the files do not arrive in a folder when accessing your domain is very likely that there is a problem in one ofabove three steps. In this case, simply use the troubleshooting options described above.

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