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The editor of this article introduces "how to configure TCP load balancer in Nginx" in detail. The content is detailed, the steps are clear, and the details are handled properly. I hope this article "how to configure TCP load balancer in Nginx" can help you solve your doubts. Let's follow the editor's ideas to learn new knowledge.

Assuming that the Kubernetes cluster is configured, we will create a virtual machine for Nginx based on CentOS.

The following are the details set up in the lab:

Nginx (CenOS8 Minimal)-192.168.1.50Kube Master-192.168.1.40Kube Worker 1-192.168.1.41Kube Worker 2-192.168.1.42

Step 1) install the epel repository

Because the nginx package is not available in the default repository of the CentOS system, you need to install the epel repository:

[root@nginxlb ~] # dnf install epel-release-y

Step 2) install Nginx

Run the following command to install nginx:

[root@nginxlb ~] # dnf install nginx-y

Use the rpm command to verify the details of the Nginx package:

[root@nginxlb ~] # rpm-qi nginx

Configure a firewall to allow access to nginx's http and https services:

[root@nginxlb] # firewall-cmd-- permanent-- add-service=http [root@nginxlb ~] # firewall-cmd-- permanent-- add-service=https [root@nginxlb ~] # firewall-cmd-reload

Use the following command to set SELinux to permissive mode and restart the system for selinux shutdown to take effect:

[root@nginxlb] # sed-is / ^ SELINUX =. * $/ SELINUX=permissive/ / etc/selinux/config [root@nginxlb ~] # reboot

Step 3) get the NodePort details of the application from Kubernetes

[kadmin@k8s-master] $kubectl get all-n ingress-nginx

As you can see from the output above, the NodePort 32760 map for each worker node is mapped to port 80 remiere NodePort 32375 to port 443. We will use these node ports in the Nginx configuration file for load balancing.

Step 4) configure Nginx for load balancing

Edit the nginx configuration file and add the following:

[root@nginxlb ~] # vim / etc/nginx/nginx.conf

Comment out the "server" section (lines 38 to 57):

And add the following lines:

Upstream backend {server 192.168.1.41 server {listen 80; location / {proxy_read_timeout 1800; proxy_connect_timeout 1800; proxy_send_timeout 1800; send_timeout 1800; proxy_set_header Accept-Encoding "; proxy_set_header X-Forwarded-By $server_addr:$server_port Proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_pass http://backend;} location / nginx_status {stub_status;}}

Save the configuration file and exit.

Based on the above changes, all requests to port 80 of nginx will be routed to the NodePort (32760) port of the Kubernetes worker node (192.168.1.41 and 192.168.1.42).

Use the following command to enable the Nginx service:

[root@nginxlb ~] # systemctl start nginx [root@nginxlb ~] # systemctl enable nginx

Test the TCP load balancer for Nginx

To test whether nginx works properly as TCP load balancer for Kubernetes, deploy nginx-based deployment, expose the port of deployment as port 80, and define the ingress resource for the deployment of nginx. I have used the following command to deploy these Kubernetes objects:

[kadmin@k8s-master] $kubectl create deployment nginx-deployment-- image=nginxdeployment.apps/nginx-deployment created [kadmin@k8s-master ~] $kubectl expose deployments nginx-deployment-- name=nginx-deployment-- type=NodePort-- port=80service/nginx-deployment exposed

Run the following command to get deployments,svc and ingress details:

Update the hosts file of the local host so that nginx-lb.example.com points to the IP address of the nginx server (192.168.1.50)

[root@localhost ~] # echo "192.168.1.50 nginx-lb.example.com" > > / etc/hosts

Try to access nginx-lb.example.com through a browser

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