[FIXED] Libvirtd QEMU / KVM monitor unexpectedly closed – failed to create chardev during live migration or virsh start

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

then remount:

mount -o remount,rw /dev/pts