Encountered an OVS startup problem [self created :( ] and thought of sharing this, and the solution, incase someone encounters this issue:
I was getting this error after I built / installed OVS. The reason was that I had first built OVS using following configure parameters: ./configure --enable-ssl --enable-Werror CC=gcc and then: make sudo make install Later, I built OVS again with follwing configure parameters: ./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc --enable-ssl --enable-Werror CC=gcc and then: make sudo make uninstall sudo make install What happended as a result was that OVS binaries were now present at two locations: $ ls /usr/local/bin/ovs-* /usr/local/bin/ovs-appctl /usr/local/bin/ovs-dpctl-top /usr/local/bin/ovs-parse-backtrace /usr/local/bin/ovs-tcpdump /usr/local/bin/ovs-testcontroller /usr/local/bin/ovs-docker /usr/local/bin/ovs-l3ping /usr/local/bin/ovs-pcap /usr/local/bin/ovs-tcpundump /usr/local/bin/ovs-vlan-test /usr/local/bin/ovs-dpctl /usr/local/bin/ovs-ofctl /usr/local/bin/ovs-pki /usr/local/bin/ovs-test /usr/local/bin/ovs-vsctl $ ls /usr/bin/ovs-* /usr/bin/ovs-appctl /usr/bin/ovs-dpctl-top /usr/bin/ovs-parse-backtrace /usr/bin/ovs-tcpdump /usr/bin/ovs-testcontroller /usr/bin/ovs-docker /usr/bin/ovs-l3ping /usr/bin/ovs-pcap /usr/bin/ovs-tcpundump /usr/bin/ovs-vlan-test /usr/bin/ovs-dpctl /usr/bin/ovs-ofctl /usr/bin/ovs-pki /usr/bin/ovs-test /usr/bin/ovs-vsctl At this point when I tried to start OVS, I got the following error: $ sudo /usr/share/openvswitch/scripts/ovs-ctl start * Starting ovsdb-server ovs-vsctl: unix:/usr/local/var/run/openvswitch/db.sock: database connection failed (No such file or directory) The reason being, the old version of ovs-vsctl was getting used: $ which ovs-vsctl /usr/local/bin/ovs-vsctl Please note that running "sudo make uninstall" did not cleanup up the old binaries because the OVS directories were already changed as a result of running the second ./configure command. Simple fix: Change the OVS directory back to old path: ./configure --enable-ssl --enable-Werror CC=gcc sudo make uninstall The old binaries got cleaned up: $ ls /usr/local/bin/ovs-* ls: cannot access '/usr/local/bin/ovs-*': No such file or directory Then, (stopped and) started OVS without any issue! $ sudo /usr/share/openvswitch/scripts/ovs-ctl stop * ovs-vswitchd is not running 2018-02-08T01:06:46Z|00001|unixctl|WARN|failed to connect to /var/run/openvswitch/ovsdb-server.31957.ctl ovs-appctl: cannot connect to "/var/run/openvswitch/ovsdb-server.31957.ctl" (No such file or directory) 2018-02-08T01:06:46Z|00001|unixctl|WARN|failed to connect to /var/run/openvswitch/ovsdb-server.31957.ctl ovs-appctl: cannot connect to "/var/run/openvswitch/ovsdb-server.31957.ctl" (No such file or directory) * Exiting ovsdb-server (31957) * Killing ovsdb-server (31957) $ sudo /usr/share/openvswitch/scripts/ovs-ctl start * Starting ovsdb-server * system ID not configured, please use --system-id * Configuring Open vSwitch system IDs * Starting ovs-vswitchd * Enabling remote OVSDB managers
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