COZsFTP to resolve domain names??

Discussion of the free COZBATCH utility for z/OS
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fulldraw68
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Joined: Mon Oct 19, 2015 5:29 pm

COZsFTP to resolve domain names??

Post by fulldraw68 » Wed Mar 15, 2017 4:02 pm

We have a TCPIP.HOSTS.LOCAL file where we add DNS entries so that we can use the domain name rather than IP in our FTP processes. This works great for FTP as we just have to add the SYSTCPD DD statement to point to what file houses our DNS entries. How do I get COZsFTP to point to this file to resolve domain names to IP addresses? Is this possible.
Thanks.

fulldraw68
Posts: 8
Joined: Mon Oct 19, 2015 5:29 pm

Re: COZsFTP to resolve domain names??

Post by fulldraw68 » Thu Mar 16, 2017 11:10 am

I have added the DNS entry to /etc/hosts file but still erroring so COZsFTP is not looking there either. Any ideas?

fulldraw68
Posts: 8
Joined: Mon Oct 19, 2015 5:29 pm

Re: COZsFTP to resolve domain names??

Post by fulldraw68 » Thu Mar 16, 2017 3:14 pm

Dovetail folks....any idea or direction you can point me in?

dovetail
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Re: COZsFTP to resolve domain names??

Post by dovetail » Thu Mar 16, 2017 5:04 pm

Note: Please use the Co:Z SFTP forum for Co:Z SFTP questions.

Co:Z SFTP invokes an IBM "ssh" command to start a secure connection, and this command runs in a separate OMVS address space.
So, you can't use a DD to point to a special resolvor (TCPIP.DATA) configuration data set.
Do you really add a DD to all of your user FTP jobs rather than using a global default for the resolver? I would say that this is not typical.

In any case, your problem seems to be that you don't have the resolver configured by default to use /etc/hosts.
Do you have it configured to point to one or more nameservers?

Here's a good IBM redbook for configuring the resolver (for z/OS 2.1):
http://www.redbooks.ibm.com/redbooks/pdfs/sg248096.pdf

The section "2.3 Implementing the resolver" has a complete example of setting up the resolver to use a nameserver (with caching) and a local file (IPNODES).

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