How To : Install Open vSwitch in CentOS 7

October 3, 2017 Virtualization

Open vSwitch is a multilayer virtual switch that been used for our KVM – QEMU server. Mostly of our Shared Hosting been setup with this technology.

Install dependencies required by Open vSwitch

[root@localhost ~]# yum install wget openssl-devel gcc make python-devel openssl-devel kernel-devel graphviz kernel-debug-devel autoconf automake rpm-build redhat-rpm-config libtool python-twisted-core python-zope-interface PyQt4 desktop-file-utils libcap-ng-devel groff checkpolicy selinux-policy-devel -y

Build the rpm of Open vSwitch.

[root@localhost ~]# adduser ovs [root@localhost ~]# su - ovs

[ovs@localhost ~]$ mkdir -p ~/rpmbuild/SOURCES [ovs@localhost ~]$ wget http://openvswitch.org/releases/openvswitch-2.5.4.tar.gz [ovs@localhost ~]$ cp openvswitch-2.5.4.tar.gz ~/rpmbuild/SOURCES/ [ovs@localhost ~]$ tar xfz openvswitch-2.5.4.tar.gz [ovs@localhost ~]$ rpmbuild -bb --nocheck /home/ovs/openvswitch-2.5.4/rhel/openvswitch-fedora.spec [ovs@localhost ~]$ exit

Installation of Open vSwitch

[root@localhost ~]# yum localinstall -y /home/ovs/rpmbuild/RPMS/x86_64/openvswitch-2.5.4.el7.centos.x86_64.rpm [root@localhost ~]# systemctl start openvswitch [root@localhost ~]# systemctl enable openvswitch

Run the following command to verify Open vSwitch running or check on the version installed.

[root@localhost ~]# ovs-vsctl --version ovs-vsctl (Open vSwitch) 2.5.4 Compiled Oct 3 2017 16:58:41 DB Schema 7.12.1

Or, you can verify Open vSwitch running with following command

9ab88687-2559-474b-880c-56ed8af65f87 ovs_version: "2.5.4"

We will set the eth0 (WAN) as a router, all WAN connection from VM will be going out thru this eth0. Please login to the server via IPMI console, because SSH session will be disconnected.

[root@localhost ~]# ovs-vsctl add-br vmbr0 [root@localhost ~]# ovs-vsctl add-port vmbr0 eth0 [root@localhost ~]# ifconfig eth0 0 [root@localhost ~]# ifconfig vmbr0 183.81.162.122 netmask 255.255.255.192 up [root@localhost ~]# route add default gw 183.81.162.97

With ifconfig , there’s no IP address showed in the eth0, the server IP address will be tagged to vmbr0

[root@INQA09 ~]# ifconfig eth0: flags=4163 mtu 1500 inet6 fe80::969c:25e5:3f21:c736 prefixlen 64 scopeid 0x20 ether 2c:60:0c:d0:5d:29 txqueuelen 1000 (Ethernet) RX packets 20530733 bytes 30259565663 (28.1 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 2951 bytes 342820 (334.7 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device memory 0xc7920000-c793ffff


lo: flags=73  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10

        loop  txqueuelen 1  (Local Loopback)

        RX packets 42  bytes 4098 (4.0 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 42  bytes 4098 (4.0 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vmbr0: flags=4163 mtu 1500 inet 183.81.162.122 netmask 255.255.255.192 broadcast 183.81.162.127 inet6 fe80::2e60:cff:fed0:5d29 prefixlen 64 scopeid 0x20 ether 2c:60:0c:d0:5d:29 txqueuelen 1000 (Ethernet) RX packets 2324938 bytes 29243612422 (27.2 GiB) RX errors 0 dropped 1586 overruns 0 frame 0 TX packets 2898 bytes 341582 (333.5 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

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