[CentOS] I broke "yum update" - C7

Am 2019-08-30 10:52, schrieb Gary Stainburn:
> On Thursday 29 August 2019 18:10:19 Alexander Dalloz wrote:
>> > 2019-08-29 17:23:18,117 exception: [Errno 14] curl#60 - "Peer's
>> > Certificate issuer is not recognized."
>> > 2019-08-29 17:23:18,117 retrycode (14) not in list [-1, 2, 4, 5, 6,
>> > 7], re-raising
>> 
>> [ ... ]
>> 
>> > Cannot retrieve metalink for repository: epel/x86_64. Please verify
>> > its path and try again
>> 
>> So can we check what version of the ca-certificates packages is being
>> installed on your system?
>> 
>> And a check into a different direction: what's the date and time of 
>> that
>> system? Does it fit or is it wrong? Time being not accurate can make 
>> SSL
>> connections fail.
> 
> Firstly, thank you for you help with this Alexander.

You are welcome Gary. And I am curious about what the cause of your repo 
troubles is.

> I had already checked the system time. It was about 3 minutes out, but
> I fixed it anyway.  I have checked the RPM for the certificates, and
> it matches the one on another box that works.
> 
> 
> [root at stan2 ~]# date
> Fri 30 Aug 09:45:27 BST 2019
> [root at stan2 ~]# rpm -qa|grep cert
> ca-certificates-2018.2.22-70.0.el7_5.noarch
> [root at stan2 ~]#

That's good. Now please verify that the ca-certificates RPM is healthy:

rpm -V ca-certificates

In addition you can grep for the DigiCert certificates which are used by 
the fedoraproject.org mirror servers for EPEL (concentrating on a single 
broken HTTPS repo for now):

# grep "DigiCert" /etc/pki/tls/certs/ca-bundle.crt
# DigiCert Assured ID Root CA
# DigiCert Assured ID Root G2
# DigiCert Assured ID Root G3
# DigiCert Global Root CA
# DigiCert Global Root G2
# DigiCert Global Root G3
# DigiCert High Assurance EV Root CA  <<- that one must be there
# DigiCert Trusted Root G4

Besides a corrupted certificates bundle I cannot imagine a different 
root cause actually.

Of course you could search system-wide for broken RPM content:

# for RPM in $(rpm -qa); do rpm -V ${RPM} >/dev/null; if [ "$?" -eq 1 ]; 
then echo "----- ${RPM} -----"; rpm -V ${RPM}; fi; done

Regards,
Alexander