The ‘UNIX software’ Archives
Posted January 16, 2004 by

Print Out Version of Postfix and Non-Default Configuration Values

These commands are useful when attempting to get help on the postfix mailing list, etc.

Category Postfix

Posted January 13, 2004 by

Connect to an https Server and Get a Page in the Style of “Telnet Host 80”

This is a useful command for making connections to https servers for monitoring or testing:

Category OpenSSL

Posted January 13, 2004 by

Sendmail: Process the Queue Manually When the Load Average is High

This command can be useful when the load average is high (not due to sendmail), and you want to flush all the mail off the system.

Category Sendmail

Posted January 13, 2004 by

Sendmail: Check Version, Compile Flags, System Identity

These options to sendmail will give you some useful version and configuration information.

Category Sendmail

Posted January 13, 2004 by

Sendmail: Process Mail from User

This command is useful for processing messages from a certain user (runs through the queue):

Category Sendmail

Posted January 13, 2004 by

Sendmail: Command Line Alias Expansion

An alias allows sendmail to redirect mail to a specific address. The following commands shows how to expand this alias and expose the redirection.

Category Sendmail

Posted January 12, 2004 by

Checkout Files from CVS

Version control systems are an important infrastructure component not only in software development but also in other contexts such as controlling changes to manuscripts or computer system configuration files.

Category UNIX software

Posted January 4, 2004 by

DNS/BIND resource record: using $GENERATE to make many records

A cool feature in versions of BIND since 8.2 and 9.1 is the $GENERATE directive which can create hundreds or thousands of resource records with a single line in zone file. A common use for $GENERATE is assigning PTR records for a DHCP address range.

Category BIND and DNS

Posted January 4, 2004 by

DNS/BIND resource record: CNAME, canonical names, host aliases

A single host may have multiple personalities: web server (www), mail server (mail, mx), dns server (ns), ftp server (ftp). Rather than assign each of these names an address (A) record pointing to the same IP address, all of which would need to be changed if the IP address changed, one name can be associated […]

Category BIND and DNS

Posted January 4, 2004 by

DNS/BIND: set TTL for individual resource records

BIND resource records allow an explict TTL value that will override the zone file’s TTL for that specific resource record. One use for this is to prevent non-authoritative servers from caching these records, perhaps in prelude to changing a server’s IP address.

Category BIND and DNS

Posted January 4, 2004 by

DNS/BIND Resource Record: Routing Mail with MX Records

Proper DNS configuration with MX records is a requirement for routing email for a domain.

Category BIND and DNS