Category Archives: Linux

How to Refresh my DNS cached record?

Posted on August 24, 2008 by Raymond

Use OpenDNS free services by adding 208.67.222.222 and 208.67.220.220 on your /etc/resolv.conf. Go to http://www.opendns.com/support/cache/ then enter the website address.

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How to list all users on a Linux machine?

Posted on August 16, 2008 by Raymond

 cat /etc/passwd | cut -d”:” -f1

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Multiple SSL Certificate on Single IP

Posted on August 6, 2008 by Raymond

Follow the links: Virtual host examples from Apache website. http://httpd.apache.org/docs/2.0/vhosts/examples.html Turns out that it is possible to have multiple VirtualHosts on port 80 (Default http), but because of a limitation of SSL, we can’t have multiple VirtualHosts on port 443 … Continue reading →

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How to Unzip a .gz File

Posted on July 28, 2008 by Raymond

$ gzip -d compressed_file.gz

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Free Secondary DNS and Online DNS Tools

Posted on July 26, 2008 by Raymond

These free tools have been designed to validate and check the health of your public DNS servers. Free Secondary DNS for your domains. If your looking for another DNS to put your domain in, this is for you. Providing additional … Continue reading →

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How to setup a primary nameservers on a dedicated server

Posted on July 25, 2008 by Raymond

Here are the steps: Locate named.conf and go to that folder. Add DNS entries for your nameserver. Edit the pri.yourname.com file for the domain you are adding nameservers for. Add these two lines at the bottom of the file: ns1 … Continue reading →

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Keeping the Root Hints Current

Posted on July 25, 2008 by Raymond

To keep the root hints file current, use the following command. $ dig @a.root-servers.net . ns > db.cache

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How to check your DNS configuration and zone files

Posted on July 25, 2008 by Raymond

If you are running BIND 9, you have handy new tools to help maintain your nameserver files: named-checkconf and named-checkzone. These tools reside in /usr/sbin or /usr/local/sbin. named-checkconf checks the configuration file for syntax errors. $ /usr/sbin/named-checkconf zonename db.local zone … Continue reading →

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Installing your own DNS Server

Posted on July 23, 2008 by Raymond

This how-to assumes a Debian-type Linux server.  1)  Install BIND $ sudo apt-get install bind9 2)  Run BIND chrooted.  For security reasons we want to run BIND chrooted so we have to do the following: $ sudo /etc/init.d/bind9 stop Edit … Continue reading →

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How to check if nameserver is valid (NS1.example.com, NS2.example.com)

Posted on July 23, 2008 by Raymond

A.  How to check if nameserver is valid $ dig ns com ;; ANSWER SECTION: com. 93009 IN NS a.gtld-servers.net. com. 93009 IN NS b.gtld-servers.net. com. 93009 IN NS c.gtld-servers.net. com. 93009 IN NS d.gtld-servers.net. com. 93009 IN NS e.gtld-servers.net. … Continue reading →

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