Many DNS troubleshooting techniques were discussed previously in this chapter, such as using the telnet program to detect reverse-DNS problems. Other troubleshooting options include script programs and named logging options.
Using Scripting to Stress-Test Your DNS Setup
You can make two handy scripts to stress-test your DNS setup. They can be named anything, but this example calls them check1 and check. The check1 script simply records the results of an nslookup in file junk.jnk, while check calls check1 for each domain and IP under consideration. Here's the code for check1:
echo "nslookup $1 $2" >> junk.jnk nslookup $1 $2 >> junk.jnk echo " " >> junk.jnk echo " " >> junk.jnk
check1 simply writes the nslookup of its arguments ...
Get Red Hat® Linux® 7 Unleashed now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.