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The original comments I added seem to have disappeared,,,, so I'll re enter them.
Replacing a certificate on z/OS with RACF is not easier.
If I want to replace a certificate I have to
delete it
recreate it
add it to the keyrings.
A "REPLACE" option which does all of the above would solve these problems, and make it trivial to replace a certificate.
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There is a rollover capabiliy which partly solves this.
I still have to delete and redefine the certificate, the rollover replaces one certificate with another.
This works fine - but the final step of deleting the original certificate is non trivial.
I also have to create a new certificate label.
I had to have the rollover in one JOB step, and the delete certificate in another job step, with conditional JCL processing to say if the return from the jobstep with the ROLLOVER is 0 - then execute the job step with the delete certificate, else do not delete the certicate.
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When trying to document a product install which includes certificates, the documentatation is non trivial.
For example
"If you have already created the certificate then... "
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With all these having gencert... REPLACE would make most of the problems go away.