yum update

[talkstock888]

hi room in istalll FC4, i'm try to patch my server. my question is how to active the key in yum.

[markjensen]

The key? GPG key?

If you want to ensure that yum uses GPG keys, I believe that there is a line in the config files for each repo that you can set to enable or disable checking GPG keys:
gpgcheck=0 (this disables checking the key for the repo listed in the file)
gpgcheck=1 (enables checking the key for the listed repo)

[talkstock888]

thanks where can i find the config file new in linux

[markjensen]

The main yum file is(was?) /etc/yum.conf

Now, I think that the standard is to have separate config files for each different repo, and these are in /etc/yum.conf.d/ I believe. (typing this from memory, so look for yourself if I made a slight error)

Oh, and you will need to be root to have permissions to edit.