I can't update my centos 7

when i use the command yum -y update. the problem is like this…

Downloading packages: No Presto metadata available for epel No Presto metadata avilable for base Failed to donwload prestodelta for repository update:[Errno 5][Errno 12] Cannot allocate memory

Error download packages:…

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# yum --disableplugin=* <command>


# yum --setopt=deltarpm=0 <command>

Your droplet does not have enough memory to update. You need to stop some services or expand your droplet. I faced this issue when running a LEMP stack with wordpress, mysql was crashing and I couldn’t update after a day of being on. This was on a 512mb $5 droplet.

Try to clear your system incl. Metadata and try afterwards. It could be caused because of wrong metadata:

sudo yum clean all