Load Balancing Configuration in NSX

Objective

NSX allows load balancing on a level 4 (TCP or UDP) layer or level 7 (HTTP or HTTPS) layer.

Learn how to set up load balancing in NSX.

Requirements

• Being an administrative contact of your Hosted Private Cloud infrastructure to receive login credentials.
• A user account with access to the OVHcloud Control Panel.
• Having NSX deployed with two segments configured in your NSX configuration, you can use the Segment Management in NSX guide for reference.
• Two virtual machines with NGINX enabled on one segment.

Instructions

We will :

• Enable Load Balancing on the gateway ovh-T1-gw.
• Create a server pool from two virtual machines that use a web server running on port 80.
• Add a virtual server in the Load Balancer configuration which contains our server pool.
• Set a NAT rule to redirect to the virtual server.

Creating the tag on both virtual machines.

To simplify the administration of the Load Balancer, we will use a tag on the two virtual machines in the future server pool.

In the NSX interface go to the Inventory tab and click on Virtual Machines on the left.

• Then click on the three vertical dots to the left of the first virtual machine.
• Choose Edit from the menu.

 

Replace Tag with loadbl, then click Add Item(s) loadbl below.

 

Change Scope to nginx, then click Add Item(s) nginx below.

 

Click the + sign next to your tag to add it to your virtual machine.

 

When the tag appears, click SAVE.

 

Click the three vertical dots to the left of the second virtual machine and choose Edit from the menu.

 

Replace Tag with load and select the Tag: loadbl Scope: nginx from the list below.

 

Click the + sign next to your tag to add it to your second virtual machine.

 

Click SAVE to add the tag to your virtual machine.

 

Stay on Inventory, click Tags and click on the number to the right of the marker you created.

 

You can see your two virtual machines using the same tag. Click CLOSE when done.

Add group with created tag

Select Groups on the left and click ADD GROUP.

 

Enter nginx-server below Name and click SET under Compute Members.

 

Click + ADD CRITERION.

 

Keep Virtual Machine Tag Equals and select your loadbl tag with its nginx scope and click APPLY.

 

Click SAVE.

 

Click View Members to the right of the group.

 

The list of virtual machines is automatically added to the group based on the criteria in your tag.

Activating the Load Balancer

Go to the Networking tab.

• In the Network Services section on the left, click on Load Balancing.
• Go to the Load Balancers tab.
• Click ADD LOAD BALANCER.

 

Enter loadbalancer-on-t1 below Name, select ovh-T1-gw under Attachment and click SAVE.

 

Click NO.

 

The Load Balancer is created and activated on the ovh-T1-gw gateway.

Server pool creation

Go to the Server Pools tab and click ADD SERVER POOL.

 

Enter sp-nginx below Name and click Select Members under Members/Group.

 

Click Select a group and choose the nginx-servers group you created then click APPLY.

 

Click SAVE to apply your changes.

 

Your server pool is created with your two virtual machines that are members of the group.

Virtual server creation

Your server pool is created with your two virtual machines which are members of the group. Go to the Virtual Servers tab and click on ADD VIRTUAL SERVER.

 

Select L4 TCP.

Fill in this information :

• Name : Name of your virtual server vs-nginx.
• IP Address: Front-end IP address of your virtual server on the same network as your NGINX virtual machines 192.168.102.3.
• Port : Port 80.
• Load Balancer: Your load balancer loadbalancer-on-t1.
• Server Pool: Your server pool sp-nginx.

Then click SAVE.

Your virtual server is active. If you connect from a machine that uses a segment on a gateway of type Tier-1 Gateways with this URL http://192.168.102.3, the Load Balancer will connect to one of the two virtual machines configured in your group.

Adding a NAT rule

Go to NAT in the Network Services section on the left and click ADD NAT RULE.

Enter to-lb-virtual-server in your rule Name with these options :

• Action : DNAT.
• Destination IP : A virtual IP address of your T0 such as 198.51.100.1.
• Translated IP : IP address of your virtual server 192.168.102.103.
• Service PORT : Choose the predefined port HTTP| 80.

Then click SAVE.

 

Your rule is active. If you click on http://virtual-ip-address-on-T0 you will be connected to your virtual server which will redirect the flow to one of the servers in your group.

Conclusion

Having read this guide, you should be able to enable Load Balancing, create a server pool from two virtual machines, add a virtual server in the Load Balancer configuration, and set a NAT rule to redirect to the virtual server.