drill: add page (#2600)

pages/common/drill.md

@@ -0,0 +1,31 @@
+# drill
+
+> Perform various DNS queries.
+
+- Lookup the IP(s) associated with a hostname (A records):
+
+`drill {{hostname.com}}`
+
+- Lookup the mail server(s) associated with a given domain name (MX record):
+
+`drill mx {{hostname.com}}`
+
+- Get all types of records for a given domain name:
+
+`drill any {{hostname.com}}`
+
+- Specify an alternate DNS server to query:
+
+`drill {{hostname.com}} @{{8.8.8.8}}`
+
+- Perform a reverse DNS lookup on an IP address (PTR record):
+
+`drill -x {{8.8.8.8}}`
+
+- Perform DNSSEC trace from root servers down to a domain name:
+
+`drill -TD {{hostname.com}}`
+
+- Show DNSKEY record(s) for a domain name:
+
+`drill -s dnskey {{hostname.com}}`