--- title: "Load Balancing Configuration in NSX" description: "NSX allows load balancing on a level 4 (TCP or UDP) layer or level 7 (HTTP or HTTPS) layer." url: https://docs.us.ovhcloud.com/en/hosted-private-cloud/vmware/nsx-configure-loadbalancing lang: en --- > For AI agents: the complete documentation index is available at https://docs.us.ovhcloud.com/en/llms.txt, the full documentation bundle is available at https://docs.us.ovhcloud.com/en/llms-full.txt. # 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](https://us.ovhcloud.com/hosted-private-cloud/vmware/) to receive login credentials. - A user account with access to the [OVHcloud Control Panel](https://manager.us.ovhcloud.com/#/hub). - Having **NSX** deployed with two segments configured in your NSX configuration, you can use the [Segment Management in NSX](https://docs.us.ovhcloud.com/en/hosted-private-cloud/vmware/nsx-segment-management.md) 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.