yum/dnf error: Failed to download metadata for repo [closed]

Answer 1

I was getting the same error with the Centos8 build inside of a docker container. Fixed by running the below:

# Do on build
RUN dnf clean all && rm -r /var/cache/dnf  && dnf upgrade -y && dnf update -y 

Error before (i was running yum update and not dnf):

Step 4/5 : RUN yum clean all && yum update -y && echo hostname -a
 ---> Running in 10d319da361d
0 files removed
CentOS-8 - AppStream                            0.0  B/s |   0  B     00:05    
Failed to download metadata for repo 'AppStream'
Error: Failed to download metadata for repo 'AppStream'

Success after:

 ---> 0b96049ee5eb
Step 4/5 : RUN dnf clean all && rm -r /var/cache/dnf  && dnf upgrade -y && dnf update -y & echo hostname
 ---> Running in f928c6da6cb0
hostname
Removing intermediate

Answer 2

In my case

sudo rm -r /var/cache/dnf 

solved my problem.

Source: https://access.redhat.com/discussions/4222851

Answer 3

You may not realize it, but yum and dnf require SSL certificates when communicating via secure HTTP (aka HTTPS). Have you checked the certificates under /etc/pki/tls/certs? There should be at least two, for example:

/etc/pki/tls/certs# ls -l
total 4
lrwxrwxrwx 1 root root   49 Jan 30 12:48 ca-bundle.crt -> /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem
lrwxrwxrwx 1 root root   55 Dec 11 13:19 ca-bundle.trust.crt -> /etc/pki/ca-trust/extracted/openssl/ca-bundle.trust.crt

If these links are missing you may be able to simply restore them. Otherwise, the files are part of the ca-certificates package. You can obtain them from another server running your operating system via yumdownloader then restore your certificates from the resulting RPM file using yum --nogpgcheck localinstall <RPM file>.

Answer 4

I was facing this issue when I tried to run

yum update -y

from a docker container. I changed the version from centos:8 to centos:7 and it solved the issue for me.