Using NGINX as load balancer at TCP level

Author: Dario Tranchitella

roles/lb/tasks/main.yml

@@ -1,34 +1,28 @@
 ---
-  - name: Installing EPEL release
-    yum:
-      name: epel-release
-      state: present
+- name: Installing EPEL release
+  yum:
+    name: epel-release
+    state: present
 
-  - name: Installing NGINX as Load Balancer
-    package:
-      name: nginx
-      state: present
+- name: Installing NGINX as Load Balancer
+  package:
+    name: nginx
+    state: present
 
-  - name: Setting systemd unit for NGINX
-    systemd:
-      name: nginx
-      enabled: yes
-      state: restarted
+- name: Setting systemd unit for NGINX
+  systemd:
+    name: nginx
+    enabled: yes
+    state: started
 
-  - name: Rendering NGINX configuration file
-    template:
-      dest: /etc/nginx/conf.d/default.conf
-      src: default.conf.j2
+- name: Rendering NGINX configuration file
+  template:
+    dest: /etc/nginx/nginx.conf
+    src: nginx.conf.j2
+  register: state
 
-  - name: Deploying Kubernetes certificates
-    copy:
-      dest: "/root/{{ item }}"
-      src: "{{ cert_path }}/{{ item }}"
-    with_items:
-      - kubernetes.pem
-      - kubernetes-key.pem
-
-  - name: Reload NGINX configuration
-    systemd:
-      name: nginx
-      state: reloaded
+- name: Reload NGINX configuration
+  systemd:
+    name: nginx
+    state: reloaded
+  when: state.changed

roles/lb/templates/default.conf.j2

@@ -0,0 +1,61 @@
+user nginx;
+worker_processes auto;
+error_log /var/log/nginx/error.log;
+pid /run/nginx.pid;
+
+
+stream {
+    upstream kube-api {
+{% for host in groups['controllers'] %}
+        server {{ hostvars[host]['ansible_host'] }}:6443;
+{% endfor %}
+    }
+
+    server {
+        listen 6443;
+        proxy_pass kube-api;
+    }
+}
+
+events {
+    worker_connections 1024;
+}
+
+include /etc/nginx/conf.d/*.conf;
+
+http {
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile            on;
+    tcp_nopush          on;
+    tcp_nodelay         on;
+    keepalive_timeout   65;
+    types_hash_max_size 2048;
+
+    include             /etc/nginx/mime.types;
+    default_type        application/octet-stream;
+
+    server {
+        listen       80 default_server;
+        listen       [::]:80 default_server;
+        server_name  _;
+        root         /usr/share/nginx/html;
+
+        include /etc/nginx/default.d/*.conf;
+
+        location / {
+        }
+
+        error_page 404 /404.html;
+            location = /40x.html {
+        }
+
+        error_page 500 502 503 504 /50x.html;
+            location = /50x.html {
+        }
+    }
+}