How to configure free DNS for cloud computing


How to configure free DDNS for cloud computing

Cloud computing has made massive computing resources to be available instantly to users with a single command. The always available, on-demand computing infrastructure comes specially handy for developers as it allows them to create and destroy development instances easily. One of the major benefit of cloud computing is you only pay for what you use, so when you are not working on a cloud-computing instance it can be powered-down and no computing cost will be charged. One drawback/annoyance of using this strategy is that the "publicly addressable" IP address will change with every reboot, to get past this we will show you how to use an automatically updated free dynamic dns system so you don't get bothered about the changing IP address anymore.


For this demonstration we will be using NoIP Free DDNS service and IP update client on a Amazon EC2 cloud instance :
  • Register and get yourself a free sub-domain from NoIP.com.
  • Open a console to your Cloud computing instance, and input following command to download and configure the NoIP DDNS Client For Linux.


  • You will be prompted to enter your username and password from NoIP and the setup will complete as shown below.


    •


  • Now, launch the NoIP daemon so it can automatically update the IP address.

    • /usr/local/bin/noip2

  • We will also need to make the application auto-launch at every reboot, we will use the init.d script as also shown earlier for this.
  • Follow the instructions provided in NoIP README file located inside the folder downloaded in the step above, and create a /etc/init.d/noip2 script to auto-start the daemon on every boot.




  • Now you can use the NoIP sub-domain from wherever you want to connect to your cloud computer.

    • If you are using Amazon EC2 use this - http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstances.html for others read their documentation.


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    Top Free Public DNS Servers



    Free and Public DNS Servers





    The DNS stands for Domain Name System, which is a benchmark technology for supervising the names of Websites and other domain names. This technology permits you to write names of websites like networking.about.com on your search engines and you’re desktop to routinely search that address on the Internet. Combination of DNS servers is the major element of the DNS. A DNS server is a kind of globe on which other countries exists. Similarly on DNS servers, the address of various other Internet hosts, database of network names exists.
    DNS is the key element of Internet service. When your computer is connected to the Internet, the ISP (Internet Service Provider) automatically allocates primary and secondary DNS server addresses to your desktop. DNS server is a kind of telephone directory for the Internet that interprets hostname of the computer into IP address. DNS servers of ISP cannot handle traffic during major times which results in the slow speed of the Internet or sometimes server down trouble. This problem is modified in the Free Public DNS Servers that can handle any amount of traffic at any time. There are multiple servers, if one breaks down; other is ready to operate for you. The list of Top Free Public DNS Servers are given below:

    Free & Public DNS Servers 

    ProviderPrimary DNS ServerSecondary DNS Server
    Level31209.244.0.3209.244.0.4
    Google28.8.8.88.8.4.4
    DNS.WATCH384.200.69.8084.200.70.40
    Comodo Secure DNS8.26.56.268.20.247.20
    OpenDNS Home4208.67.222.222208.67.220.220
    DNS Advantage156.154.70.1156.154.71.1
    Norton ConnectSafe5199.85.126.10199.85.127.10
    GreenTeamDNS681.218.119.11209.88.198.133
    SafeDNS7195.46.39.39195.46.39.40
    OpenNIC8107.150.40.23450.116.23.211
    SmartViper208.76.50.50208.76.51.51
    Dyn216.146.35.35216.146.36.36
    FreeDNS937.235.1.17437.235.1.177
    censurfridns.dk1089.233.43.7191.239.100.100
    Hurricane Electric1174.82.42.42
    puntCAT12109.69.8.51
    [1] The free DNS servers listed above as Level3 will automatically route to the nearest DNS server operated by Level3 Communications, the company that provides most of the ISPs in the US their access to the Internet backbone.
    [2] Google also offers IPv6 public DNS servers: 2001:4860:4860::8888 and 2001:4860:4860::8844.
    [3] DNS.WATCH also has IPv6 DNS servers at 2001:1608:10:25::1c04:b12f and 2001:1608:10:25::9249:d69b. In an uncommon but much appreciated move, DNS.WATCH publishes live statistics for both of their free DNS servers. Both servers are located in Germany which could impact performance if used from the US or other remote locations.
    [4] OpenDNS also offers DNS servers that block adult content, called OpenDNS FamilyShield. Those DNS servers are 208.67.222.123 and 208.67.220.123. A premium DNS offering is also available, called OpenDNS Home VIP.
    [5] The Norton ConnectSafe free DNS servers listed above block sites hosting malware, phishing schemes, and scams, and is called Policy 1. Use Policy 2 (199.85.126.20 and 199.85.127.20) to block those sites plus those with pornographic content. Use Policy 3 (199.85.126.30 and 199.85.127.30) to block all previously mentioned site categories plus those Norton deems "non-family friendly." Be sure to check out the list of things blocked in Policy 3 - there are several controversial topics in there that you may find perfectly acceptable.
    [6] GreenTeamDNS "blocks 18 categories which include malware, botnets, dangerous websites, adult related content, aggressive/violent sites as well as advertisements and drug-related websites" according to their FAQ page. Premium accounts have more control.
    [7] Register here with SafeDNS for content filtering options in several areas.
    [8] The DNS servers listed here for OpenNIC are just two of many in the US and across the globe. Instead of using the OpenNIC DNS servers listed above, see their complete list of public DNS servers here and use two that are close to you or, better yet, let them tell you that automatically here. OpenNIC also offers some IPv6 public DNS servers.
    [9] FreeDNS says that they "never log DNS queries." Their free DNS servers are located in Austria.
    [10] The censurfridns.dk DNS servers are uncensored, operated by a privately funded individual, and are physically located in Denmark. You can read more about them here. IPv6 DNS servers are also available at 2002:d596:2a92:1:71:53:: and 2001:67c:28a4::.
    [11] Hurricane Electric also has an IPv6 public DNS server available: 2001:470:20::2.
    [12] puntCAT is physically located near Barcelona, Spain. The IPv6 version of their free DNS server is 2a00:1508:0:4::9.
    Note: Primary DNS servers are sometimes called preferred DNS servers and secondary DNS servers are sometimes called alternate DNS servers. Primary and secondary DNS servers can be "mixed and matched" to provide another layer of redundancy.


    How Do I Change DNS Servers?




    source:
    http://pcsupport.about.com/od/tipstricks/a/free-public-dns-servers.htm

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