On Tue, Apr 26, 2016 at 07:09:39PM +0800, 307419146 at qq.com wrote: > Apr 26 03:51:17 ppmaster ovsdb-server[711]: ovs|00002|stream_unix|ERR|/var/run/openvswitch/db.sock: binding failed: No such file or directory /var/run/openvswitch doesn't exist. You'll have to create it. (The scripts that come with OVS do this for you.)