Today we had a problem at work on a system. Without getting into too much detail as to give away secrets behind the verbal NDA I am behind, I will just say that it had to do with a GPG public key of mine that was expired on a dev machine, accidentally propagating during install to a production machine.
This key had a sub key as well, so figuring out this was tricky.
To start, you can list your gpg keys like so
gpg --list-keys
This will list keys such aspub 4096R/01A53981 2011-11-09 [expires: 2016-11-07]
uid Tyrel Anthony Souza (Five year key for email.)
sub 4096R/C482F56D 2011-11-09 [expires: 2016-11-07]
To make this not expire, (same steps to change expiration date to another time), you must first edit the keygpg --edit-key 01A53981
You will then see a gpg prompt
gpg>
Type “expire” in and you will be prompted for how long to change it toChanging expiration time for the primary key.
Please specify how long the key should be valid.
0 = key does not expire
<n> = key expires in n days
<n>w = key expires in n weeks
<n>m = key expires in n months
<n>y = key expires in n years
You are then done setting the expiration on the primary key, if you have sub key, doing this is as easy as typingkey 1
and repeating the expiration step.
To finish and wrap things up, type save and you are done.