Host Intermittently Fails to Converge.

Problem

Host fails to converge with the below error messages in log /var/log/pf9/ostackhost.log:

ERROR nova.virt.libvirt.host [-] Connection to libvirt failed: Failed to connect socket to ‘/var/run/libvirt/libvirt-sock’: Permission denied

Environment

• Platform9 Managed OpenStack - v4.0 and Higher
• libvirtd
• Pf9-ostackhost

Cause

The libvirtd service socket permission is incorrect. This permission was either modified manually or by some third-party application.

Resolution

1. Correct the permission under /etc/libvirt/libvirtd.conf

# cat /etc/libvirt/libvirtd.conflisten_tcp=1listen_tls=0auth_tcp="none"tcp_port="16509"auth_unix_ro = "none"auth_unix_rw = "none"unix_sock_group = "root"unix_sock_ro_perms = "0777"unix_sock_rw_perms = "0777"

2. Restart libvirtd.service

# systemctl restart libvirtd

3. Check the libvirt-sock permission.

# ls -lrth /var/run/libvirt/libvirt-socksrwxrwxrwx. 1 root root 0 Nov 17 19:47 /var/run/libvirt/libvirt-sock