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A.19.2.4. 权限已拒绝

症状
当以非 root 用户身份运行 virsh 命令时，会出现以下错误（或类似）: 
$ virsh -c qemu://$hostname/system_list
error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Permission denied
error: failed to connect to the hypervisor
解决方案
  1. 编辑 /etc/libvirt/libvirt.conf 文件，并将以下几行添加到文件中： 
    #unix_sock_group = "libvirt"
#unix_sock_ro_perms = "0777"
#unix_sock_rw_perms = "0770"
  2. 重启 libvirtd 服务： 
    # systemctl restart libvirtd