DNS cache - dnsmasq

[janasx1]

I setup dns caching using dnsmasq.
dnsmasq is a non-persistent DNS cache.

1. Install dnsmasq from synaptic package manager
2. set following parameters in /etc/dnsmasq.conf
resolv-file=/etc/resolv.dnsmasq.conf
listen-address=127.0.0.1
3. create file /etc/resolv.dnsmasq.conf with following lines. (feel free to use your ISP's dns here. I am using openDNS)
nameserver 208.67.222.222
nameserver 208.67.220.220
4. restart dnsmasq
/etc/init.d/dnsmasq restart
5. add 127.0.0.1 as the first dns in your network config.

To clear the cache, restart dnsmasq (#4 above)

To test config, execute below command twice and the time taken for the second request should be much less.
dig www.pclinuxos.com

[muungwana]

5. add 127.0.0.1 as the first dns in your network config.

above line need to be expanded and explained.

[janasx1]

Sure.
Here are the steps for #5.

1. open PCLinuxOS Control Center
2. click on network & internet
3. click on network center
4. click on wired/wireless depending on the way you connect
5. If wireless, select the ssid you are connected to
6. click on configure
7. un-check "get DNS servers from dhcp"
8. type in 127.0.0.1 in dns server 1 field.
9. click ok and then quit

[janasx1]

Here is the explanation.

All the dns requests will be routed to 127.0.0.1 which is dnsmasq. dnsmasq will try to lookup first in the cache and if the cache does not have it, it will look up against opendns servers and puts it in the cache. subsequent requests to dnsmasq will come from the local cache.

[sling-shot]

Request one more clarification:

What is the validity of the cache? Will it be stored on a reboot or cleared? Or will it only be cleared manually?

I shutdown my desktop everyday.

-SS.

[janasx1]

I believe its in memory and will get cleared on reboot.

[AndrzejL]

As a warning I might add that if You use Internet Connection Sharing and You use Bind - do not use dnsmasq - I tried and it removes bind during installation.

Regards.

Andy

[janasx1]

Hi Andy,
I have another more recent post in tips and tricks about using bind for dns caching.
Thanks

[YouCanToo]

I setup dns caching using dnsmasq.
dnsmasq is a non-persistent DNS cache.

1. Install dnsmasq from synaptic package manager
2. set following parameters in /etc/dnsmasq.conf
resolv-file=/etc/resolv.dnsmasq.conf
listen-address=127.0.0.1
3. create file /etc/resolv.dnsmasq.conf with following lines. (feel free to use your ISP's dns here. I am using openDNS)
nameserver 208.67.222.222
nameserver 208.67.220.220
4. restart dnsmasq
/etc/init.d/dnsmasq restart
5. add 127.0.0.1 as the first dns in your network config.

To clear the cache, restart dnsmasq (#4 above)

To test config, execute below command twice and the time taken for the second request should be much less.
dig www.pclinuxos.com

How about doing a small write up about this in the howto section of the pclinuxoshelp knowledge base? (http://pclinuxoshelp.com)

[AndrzejL]

Hi Andy,
I have another more recent post in tips and tricks about using bind for dns caching.
Thanks

I cannot find it. Plus I am not saying that Your way is bad with dnsmasq all I am saying - if You use bind - don't use dnsmasq .

Andy

[AndrzejL]

Ah nevermind. I have found it . It was in the wrong section - not in Tips and Tricks but in Networking.

Here is the link to the bind HOWTO. http://www.pclinuxos.com/forum/index.php/topic,99575.0.html

Will check it out.

[janasx1]

I would love to add this to the knowledge base.
How do I register to login?
Thanks

[YouCanToo]

I would love to add this to the knowledge base.
How do I register to login?
Thanks

Send me a PM with your username, real name and a working email address. I will setup your account and an email will be sent with a temp password to use, Once you log into the knowledge base you can change your password to what ever you want it to be. Make sure to tell me it is for the knowledge base

YouCanToo

[janasx1]

Thanks YouCanToo.
I now have login to the knowledge base.
I am having trouble adding a page to HOWTO category. If I edit it adds to the category page itself.
Thanks

[YouCanToo]

Thanks YouCanToo.
I now have login to the knowledge base.
I am having trouble adding a page to HOWTO category. If I edit it adds to the category page itself.
Thanks

Log in and goto the HowTo page on the left side in the search box type in the name that you want to name your page and click search.

Example: I typed in "My new page and pressed search. This is the results.

Search results

    Content pages
    Multimedia
    Help and Project pages
    Everything
    Advanced

    Showing below 1 result starting with #1.

Create the page "My new page" on this wiki!

    Live CD faq
    === My CD is in my drive, but when I turn my computer on, nothing different happens === === Why does my computer freeze when trying to boot the live CD? ===
    8 KB (1,470 words) - 22:17, 24 June 2011


Now I clicked on My new page that is in red. The results are this will become your new page (file)  You can than click on "edit" at the top to add your information to the page. You can only edit a page when you are logged into the system.

 MAKE SURE that you add the following to the very bottom of your page on a line by itself

[[Category:HowTo]]

When you are finished with your page make sure that you save it.  Now your new page will automatically be added to the HowTo section in alphabetical order according to the first word of the page name.

In my example the listing would be listed under the letter M since my page name was "My new page"


If you have questions please ask. If you can't figure it out let me know the name you want and I will add it and than you can edit the file as needed.