If you are working with Linux environment, you must have once in your carrier ended up with this error "another app is currently holding the yum lock" or "Existing lock /var/run/yum.pid: another copy is running
this system has no repositories available through subscriptions. Solved there are no enabled repos. How to configure RHEL to perform yum install without subscription. there are no enabled repos oracle linux. centos 7 yum repository.