How To Install Open vSwitch on CentOS 8 | RHEL 8

Here we’ll use the os-net-confi script for the configuration of Open vSwtich on CentOS/RHEL. So, follow the below steps to configure the Open vSwitch on your system.

Step 1: Install os-net-config Tool

To configure the Open vSwitch we need os-net-config tool as it will help us to perform configuration steps more easily. It provides the configuration of host networking using YAML or JSON files format.

By default, os-net-config use the YAML file that can be located under /etc/os-net-config/config.yaml. You can also customize this by –config-file(-c) CLI option.

Installing os-net-config by using OpenStack Repository

Hit the following command to install the os-net-config tool using OpenStack repository if you’ve already configured it.

sudo yum install os-net-config

Find out more details about the package by typing

[sabi@localhost ~]$ rpm -qi os-net-config
Name : os-net-config
Version : 11.3.1
Release : 1.el8
Architecture: noarch
Install Date: Sat 08 Aug 2020 02:20:02 AM EDT
Group : Unspecified
Size : 3760703
License : ASL 2.0
Signature : RSA/SHA1, Sun 19 Apr 2020 12:34:05 PM EDT, Key ID f9b9fee7764429e6
Source RPM : os-net-config-11.3.1-1.el8.src.rpm
Build Date : Fri 28 Feb 2020 08:55:33 AM EST
Build Host : c1be.rdu2.centos.org
Relocations : (not relocatable)
Packager : CBS cbs@centos.org
Vendor : CentOS
URL : http://pypi.python.org/pypi/os-net-config
Summary : Host network configuration tool
Description :
Host network configuration tool for OpenStack.

Installing os-net-config with the help of Pip

You can also install the os-net-config tool using pip or pip3 as it is distributed as python package.

CentOS 8:

sudo dnf install python3-pip

CentOS 7:

sudo yum install -y epel-release
sudo yum -y install python-pip
sudo pip install os-net-config

Make sure to verify the PATH once the installation finished.

[sabi@localhost ~]$ which os-net-config
/usr/bin/os-net-config

Step 2: Configuring Open vSwitch by using os-net-config

Let’s dive into the configuration of Open vSwitch by using os-net-config tool as we’ve already installed the Open vSwitch and the configuration tool.

Here we’ll see some example to understand that how we can configure.

Single Interface Configuration with Static IP Address

First create a YAML file to save configuration.

sudo nano ovs-interface.yml

And then configure as shown below:

network_config:
- type: interface
 name: eth1
 use_dhcp: false
 use_dhcpv6: false
 addresses:
- ip_netmask: 172.11.101.10/24
routes:
- ip_netmask: 0.0.0.0/0
next_hop: 172.11.101.254
default: true

Result:

It’ll configure the eth1 interface along with the static IP address as 172.11.101/24 and the gateway is 172.11.101.254.

Run the given command to apply the configuration changes.

sudo os-net-config -c ovs-interface.yml

Configure OVS bridge With Single Attached Interface (Port)

First create the file for configuration and then do the changes as given below:

sudo nano ovs-bridge-single-interface.yml

It’ll look like this:

network_config:
- type: ovs_bridge
 name: br-ex 
use_dhcp: false 
use_dhcpv6: false 
addresses:
 - ip_netmask: 172.11.101.10/24
routes:
- ip_netmask: 0.0.0.0/0
next_hop: 172.11.101.254
default: true
members:
-
type: interface
name: eth1

Finally apply the configuration.

os-net-config -c ovs-bridge-single-interface.yml

Configure OVS Bridge on OVS Bond

Follow the below configuration for OVS bridge.

network_config:
- type: 
ovs_bridge 
name: br-ex 
use_dhcp: true 
members: 
- type: ovs_bond 
name: bond1 
members: 
- type: interface
name: em1
- type: interface
name: em2

Apply the changes in a file as done in above step.

Configure Tagged VLAN Interface On Top of OVS Bridge

Here’s the configuration sample.

network_config:
- type: ovs_bridge 
name: br-ctlplane
 use_dhcp: true 
members: 
- type: interface
name: em1
- type: vlan 
vlan_id: 20 
addresses:
- ip_netmask: 192.0.2.1/24

Creating an OVS Bond

You can create OVS bond by doing the changes as given below:

network_config:
- type: ovs_bridge
 name: bond1 
use_dhcp: true
 members: 
- type: interface
name: eno1
- type: interface
name: eno2

Checking OVS Configuration

Once the settings are applied, network config script will be added automatically to /etc/sysconfig/network-scripts/ directory.

ls /etc/sysconfig/network-scripts/

Verify the settings by hitting

ovs-vsctl show

Step 3: Creating KVM Network with OVS

For users who are using Open vSwitch with KVM virutalization, need to define the network that Virtual Machine will use.

Create xml config file.

sudo nano kvm-ovs.xml

Then add the bridge details in the file and save it.

<network>
<name>ovs-bridge </name>
<forward mode='bridge'/>
<bridge name='br-ex'/>
<virtualport type='openvswitch'/>
<network/>

Note:

ovs-bridge: Name of the libvirt network
br-ex: Name of OVS bridge

To define a network from the XML file, without starting it hit

sudo virsh net-define kvm-ovs.xml

If you want to start the inactive network(previously defined) type

sudo virsh net-start ovs-bridge

To start a network when service started, type the following command:

sudo virsh net-autostart ovs-bridge

Verify that autostart flag is turned to yes.

sudo virsh net-list --all

So, this is how you can configure the Open vSwitch on CentOS/RHEL.

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Introduction:

Safety appliance might permit packets among some interfaces to be forwarded in layer 2 (referred to as transparent mode), and packets among some interfaces to be forwarded in layer three (referred to as routing mode), in particular depending on specific requirement. To facilitate a flexible configuration of hybrid mode of layer 2 and layer3, gadget introduces the concept of Virtual Switch (vswitch).

By default system ships with a vswitch called vswitch1. each time you create a vswitch, gadget will create a corresponding vswitch interface (vswitchIF) for the vswitch mechanically. You could bind an interface to a vswitch by binding that interface to a safety sector, and then binding the security zone to the vswitch.

A vSwitch acts as a layer 2 forwarding zone, and every vswitch has its personal independent MAC address, so the packets of various interfaces in a single vswitch might be forwarded in line with layer 2 forwarding rules. You can configure policy regulations without problems in a vswitch. A vswitchif virtually acts as a switch uplink interface, allowing packets forwarding among layer 2 and layer 3.

Some of the important features of Open vSwitch are given below:

• Visibility into inter-VM communication via NetFlow, sFlow(R), IPFIX, SPAN, RSPAN, and GRE-tunneled mirrors
• LACP (IEEE 802.1AX-2008)
• Standard 802.1Q VLAN model with trunking
• Multicast snooping
• IETF Auto-Attach SPBM and rudimentary required LLDP support
• BFD and 802.1ag link monitoring
• STP (IEEE 802.1D-1998) and RSTP (IEEE 802.1D-2004)
• Fine-grained QoS control
• Support for HFSC qdisc
• Multi-table forwarding pipeline with flow-caching engine
• Forwarding layer abstraction to ease porting to new software and hardware platforms

Now, we’ll move towards the installation process.

Step 1: Install Open vSwitch on CentOS 8 / RHEL 8

Add OpenStack Repository to install the Open vSwtich on CentOS 8 / REHL 8. Type the below command in your terminal.

On CentOS 8:

sudo yum install -y epel-release
sudo yum install -y centos-release-openstack-train

On RHEL 8:

sudo subscription-manager repos --enable=openstack-16-for-rhel-8-x86_64-rpms
sudo subscription-manager repos --enable=fast-datapath-for-rhel-8-x86_64-rpms
sudo subscription-manager repos --enable=rhel-8-server-optional-rpms

For those users having no Red Hat OpenStack subscription, can use RDO:

sudo subscription-manager repos --enable=rhel-8-server-optional-rpms
sudo sudo yum install https://rdoproject.org/repos/rdo-release.rpm

Finally hit the below command to install the Open vSwitch on CentOS 8 / REHL 8.

sudo yum install openvswitch libibverbs

Press “Y” when prompted.

CentOS 8:

[sabi@localhost ~]$ sudo yum install openvswitch libibverbs
[sudo] password for sabi:
Last metadata expiration check: 0:05:07 ago on Sat 08 Aug 2020 01:21:33 AM EDT.
Package libibverbs-26.0-8.el8.x86_64 is already installed.
Dependencies resolved.
Package Arch Version Repository Size
Installing:
openvswitch x86_64 2.12.0-1.1.el8 centos-openstack-train 2.0 M
Transaction Summary
Install 1 Package
Total download size: 2.0 M
Installed size: 5.7 M
Is this ok [y/N]: y
Downloading Packages:
openvswitch-2.12.0-1.1.el8.x86_64.rpm 264 kB/s | 2.0 MB 00:07
Total 238 kB/s | 2.0 MB 00:08
warning: /var/cache/dnf/centos-openstack-train-ceeb4cd59b18ee21/packages/openvswitch-2.12.0-1.1.el8.x86_64.rpm: Header V4 RSA/SHA1 Signature, key ID 764429e6: NOKEY
CentOS- 8 - OpenStack train 1.0 MB/s | 1.0 kB 00:00
Importing GPG key 0x764429E6:
Userid : "CentOS Cloud SIG (http://wiki.centos.org/SpecialInterestGroup/Cloud) security@centos.org"
Fingerprint: 736A F511 6D9C 40E2 AF6B 074B F9B9 FEE7 7644 29E6
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Cloud
Is this ok [y/N]: y

RHEL 8:

Updating Subscription Management repositories.
RDO CentOS-7 - QEMU EV 208 kB/s | 18 kB 00:00
OpenStack Train Repository 23 MB/s | 3.9 MB 00:00
Dependencies resolved.
Package Architecture Version Repository Size
Installing:
openvswitch x86_64 1:2.12.0-1.el7 openstack-train 2.0 M
Installing dependencies:
compat-openssl10 x86_64 1:1.0.2o-3.el8 rhel-8-for-x86_64-appstream-rpms 1.1 M
dpdk x86_64 18.11.2-3.el8 rhel-8-for-x86_64-appstream-rpms 1.8 M
make x86_64 1:4.2.1-10.el8 rhel-8-for-x86_64-baseos-rpms 498 k
python2 x86_64 2.7.17-1.module+el8.2.0+4561+f4e0d66a rhel-8-for-x86_64-appstream-rpms 108 k
python2-libs x86_64 2.7.17-1.module+el8.2.0+4561+f4e0d66a rhel-8-for-x86_64-appstream-rpms 6.0 M
python2-pip-wheel noarch 9.0.3-16.module+el8.2.0+5478+b505947e rhel-8-for-x86_64-appstream-rpms 1.2 M
python2-setuptools-wheel noarch 39.0.1-11.module+el8.1.0+3446+c3d52da3 rhel-8-for-x86_64-appstream-rpms 289 k
Installing weak dependencies:
python2-pip noarch 9.0.3-16.module+el8.2.0+5478+b505947e rhel-8-for-x86_64-appstream-rpms 1.9 M
python2-setuptools noarch 39.0.1-11.module+el8.1.0+3446+c3d52da3 rhel-8-for-x86_64-appstream-rpms 643 k
Enabling module streams:
python27 2.7
Transaction Summary
Install 10 Packages
Total download size: 15 M
Installed size: 54 M
Is this ok [y/N]: y
…
1.0 MB/s | 1.0 kB 00:00
Importing GPG key 0x764429E6:
Userid : "CentOS Cloud SIG (http://wiki.centos.org/SpecialInterestGroup/Cloud) security@centos.org"
Fingerprint: 736A F511 6D9C 40E2 AF6B 074B F9B9 FEE7 7644 29E6
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Cloud
Is this ok [y/N]: y

Then start & enable the Open vSwitch services.

sudo systemctl enable --now openvswitch

Now, verify the status by hitting.

sudo systemctl status openvswitch

Output:

[sabi@localhost ~]$ sudo systemctl status openvswitch
[sudo] password for sabi:
● openvswitch.service - Open vSwitch
Loaded: loaded (/usr/lib/systemd/system/openvswitch.service; enabled; vendor>
Active: active (exited) since Sat 2020-08-08 01:39:42 EDT; 17min ago
Process: 136991 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
Main PID: 136991 (code=exited, status=0/SUCCESS)
Tasks: 0 (limit: 15464)
Memory: 0B
CGroup: /system.slice/openvswitch.service
Aug 08 01:39:42 localhost.localdomain systemd[1]: Starting Open vSwitch…
Aug 08 01:39:42 localhost.localdomain systemd[1]: Started Open vSwitch.
lines 1-11/11 (END)

And then type the below command to verify that if it is usable or not.

[sabi@localhost ~]$ sudo ovs-vsctl show
b42363e3-4690-4b2c-83fd-f2e6dc44031e
ovs_version: "2.12.0"

If you want to configure the Open vSwitch type the following command in your terminal to install os-net-config .

sudo yum install os-net-config

So, this is how you can install Open vSwitch on CentOS 8 / RHEL 8.

After it in the next tutorial we’ll cover the configuraiton of Open vSwitch on CentOS 8 / RHEL 8.

If you’ve any queries regarding this guide, feel free to ask in comment section. We’ll try to help you solve your problems ASAP!

The post How To Install Open vSwitch on CentOS 8 | RHEL 8 appeared first on Linux Windows and android Tutorials.