Fixing Libvirt/QEMU KVM Permission Errors in RHEL 7/CentOS 7
If you get errors like these while trying to live-migrate a virtual machine or run `virsh start`, then there is a simple fix. If this is a live migration, the fix probably needs to be applied to the destination, but updating both sides is a good idea.
libvirtd: error : qemuMonitorIORead:610 : Unable to read from monitor: Connection reset by peer libvirtd: error : qemuProcessReportLogError:1912 : internal error: qemu unexpectedly closed the monitor: qemu-kvm: -chardev pty,id=charserial0: Failed to create chardev libvirtd: error : qemuMonitorIO:719 : internal error: End of file from qemu monitor
A Simple Fix
Just add this to fstab:
devpts /dev/pts devpts gid=5,mode=620 0 0
mount -o remount,rw /dev/pts