KVM error: Failed to connect socket to ‘/var/run/libvirt/libvirt-sock‘

[root@localhost ~]# virsh list 
error: failed to connect to the hypervisor
error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory

[root@localhost ~]# systemctl status libvirtd
● libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:libvirtd(8)
           https://libvirt.org

[root@localhost ~]# systemctl start libvirtd
[root@localhost ~]# systemctl status libvirtd
● libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2018-12-27 23:39:09 EST; 1s ago
     Docs: man:libvirtd(8)
           https://libvirt.org
 Main PID: 2319 (libvirtd)
    Tasks: 19 (limit: 32768)
   CGroup: /system.slice/libvirtd.service
           ├─2319 /usr/sbin/libvirtd
           ├─2425 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq...
           └─2428 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq...

Dec 27 23:39:09 localhost.localdomain systemd[1]: Started Virtualization...
Dec 27 23:39:10 localhost.localdomain dnsmasq[2425]: started, version 2....
Dec 27 23:39:10 localhost.localdomain dnsmasq[2425]: compile time option...
Dec 27 23:39:10 localhost.localdomain dnsmasq-dhcp[2425]: DHCP, IP range...
Dec 27 23:39:10 localhost.localdomain dnsmasq-dhcp[2425]: DHCP, sockets ...
Dec 27 23:39:10 localhost.localdomain dnsmasq[2425]: reading /etc/resolv...
Dec 27 23:39:10 localhost.localdomain dnsmasq[2425]: using nameserver 11...
Dec 27 23:39:10 localhost.localdomain dnsmasq[2425]: read /etc/hosts - 2...
Dec 27 23:39:10 localhost.localdomain dnsmasq[2425]: read /var/lib/libvi...
Dec 27 23:39:10 localhost.localdomain dnsmasq-dhcp[2425]: read /var/lib/...
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------

[root@localhost ~]#