Hi @Thomas_B, I encourage you to post your question in English so that it can reach a wider audience and increase your chances of finding a solution. By doing so, you'll not only receive more assistance, but your solution can also benefit a larger community. Cheers, 

@Thomas_B 

try installing epel

yum install -y epel-release

and then

https://docs.centreon.com/docs/21.10/installation/installation-of-a-central-server/using-packages/#remi-repository-1

yum install -y yum-utils
yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install -y https://rpms.remirepo.net/enterprise/remi-release-7.rpm
yum-config-manager --enable remi-php80

@ponchoh 

when i do this command ( and every other ones) i got an error message

and i don’t know what i have to do to resolve it.

yum clean all

and try again

@ponchoh 

i did it

but when i want to try again the commands.

i got the same error message than before.

and when i do the commands : 

yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm yum install -y https://rpms.remirepo.net/enterprise/remi-release-7.rpm

i got this error 

i don’t understand why i have this, maybe i did something wrong ?

https://unix.stackexchange.com/questions/91970/yum-update-error-could-not-retrieve-mirrorlist