Check the repo directory:
[root@localhost ~]# ls /etc/yum.repos.d
CentOS-Base.repo CentOS-Sources.repo
CentOS-CR.repo CentOS-Vault.repo
CentOS-Debuginfo.repo docker-ce.repo
CentOS-fasttrack.repo download.docker.com_linux_centos_docker-ce.repo
CentOS-Media.repo
Test to see if such repo has been installed by RPM. If so, remove it using rpm
[root@localhost ~]# rpm -qa | grep -i download.docker.com_linux_centos_docker-ce.repo
[root@localhost ~]# rpm -e download.docker.com_linux_centos_docker-ce.repo
error: package download.docker.com_linux_centos_docker-ce.repo is not installed
As shown above, this download.docker.com_linux_centos_docker-ce.repo is not installed by RPM. Thus, it can be removed manually.
[root@localhost ~]# rm -f /etc/yum.repos.d/download.docker.com_linux_centos_docker-ce.repo
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