Fixed dockerfile for high availability loadbalancer using HAProxy

.travis.yml

@@ -43,18 +43,15 @@ env:
 
     # Test multiple masters in control plane with PostgreSQL
     - MOLECULE_DISTRO: geerlingguy/docker-centos8-ansible:latest
-      MOLECULE_SCENARIO_DIRECTORY: /home/travis/build/${REPO_OWNER}/${ROLE_OWNER}.${ROLE_NAME}/molecule/highavailability
       MOLECULE_SCENARIO: highavailability
 
     # Test multiple masters with auto deploying manifests
     - MOLECULE_DISTRO: geerlingguy/docker-centos8-ansible:latest
-      MOLECULE_SCENARIO_DIRECTORY: /home/travis/build/${REPO_OWNER}/${ROLE_OWNER}.${ROLE_NAME}/molecule/highavailability
       MOLECULE_SCENARIO: highavailability
       MOLECULE_PLAYBOOK: playbook-auto-deploying-manifests.yml
 
     # Test multiple masters in control plane with DQLite
     - MOLECULE_DISTRO: geerlingguy/docker-centos8-ansible:latest
-      MOLECULE_SCENARIO_DIRECTORY: /home/travis/build/${REPO_OWNER}/${ROLE_OWNER}.${ROLE_NAME}/molecule/highavailability
       MOLECULE_SCENARIO: highavailability
       MOLECULE_PLAYBOOK: playbook-dqlite.yml
 

molecule/highavailability/Dockerfile.j2

@@ -5,10 +5,3 @@ FROM {{ item.registry.url }}/{{ item.image }}
 {% else %}
 FROM {{ item.image }}
 {% endif %}
-
-RUN if [ $(command -v apt-get) ]; then apt-get update && apt-get install -y python sudo bash ca-certificates && apt-get clean; \
-    elif [ $(command -v dnf) ]; then dnf makecache && dnf --assumeyes install python sudo python-devel python*-dnf bash && dnf clean all; \
-    elif [ $(command -v yum) ]; then yum makecache fast && yum install -y python sudo yum-plugin-ovl bash && sed -i 's/plugins=0/plugins=1/g' /etc/yum.conf && yum clean all; \
-    elif [ $(command -v zypper) ]; then zypper refresh && zypper install -y python sudo bash python-xml && zypper clean -a; \
-    elif [ $(command -v apk) ]; then apk update && apk add --no-cache python sudo bash ca-certificates; \
-    elif [ $(command -v xbps-install) ]; then xbps-install -Syu && xbps-install -y python sudo bash ca-certificates && xbps-remove -O; fi

molecule/highavailability/haproxy-loadbalancer.conf.j2

@@ -0,0 +1,13 @@
+frontend loadbalancer
+    bind *:6443
+    mode tcp
+    default_backend control_nodes
+    timeout client          1m
+
+backend control_nodes
+    mode tcp
+    balance roundrobin
+    server node2 node2:6443
+    server node3 node3:6443
+    timeout connect        30s
+    timeout server         30m

molecule/highavailability/molecule.yml

@@ -43,13 +43,10 @@ platforms:
     networks:
       - name: k3snet
   - name: loadbalancer
-    image: nginx:1.17-alpine
+    image: geerlingguy/docker-centos8-ansible:latest
     pre_build_image: true
     ports:
       - "6443:6443"
-    volumes:
-      - ${MOLECULE_SCENARIO_DIRECTORY}/nginx-loadbalancer.conf:/etc/nginx/nginx.conf:ro
-    command: "nginx -g 'daemon off;'"
     networks:
       - name: k3snet
 provisioner:

molecule/highavailability/nginx-loadbalancer.conf

@@ -1,34 +0,0 @@
-worker_processes 4;
-worker_rlimit_nofile 40000;
-
-events {
-    worker_connections 8192;
-}
-
-stream {
-    # Set up our upstream of control (master) nodes. The default load balancing
-    # algorithm for nginx is to round-robin. Perfect!
-    upstream control_plane {
-        server node2:6443 max_fails=3 fail_timeout=5s;
-        server node3:6443 max_fails=3 fail_timeout=5s;
-    }
-
-    upstream control_plane_443 {
-        server node2:443 max_fails=3 fail_timeout=5s;
-        server node3:443 max_fails=3 fail_timeout=5s;
-    }
-
-    # Listen on port 6443, this is our default control plane port, then pass
-    # all traffic to one of the control (master) nodes.
-    server {
-        listen 6443;
-        proxy_pass control_plane;
-    }
-
-    # Listen on port 443, this is our default ssl port, then pass
-    # all traffic to one of the control (master) nodes.
-    server {
-        listen 443;
-        proxy_pass control_plane_443;
-    }
-}

molecule/highavailability/prepare.yml

@@ -1,7 +1,23 @@
 ---
 - name: Prepare
-  hosts: node*
+  hosts: loadbalancer
   tasks:
-    - name: Debug Message
-      debug:
-        msg: No prepare steps required
+    - name: Ensure HAProxy is installed
+      package:
+        name: haproxy
+        state: present
+
+    - name: Ensure HAProxy config directory exists
+      file:
+        path: /usr/local/etc/haproxy
+        state: directory
+
+    - name: Ensure HAProxy is configured
+      template:
+        src: haproxy-loadbalancer.conf.j2
+        dest: /usr/local/etc/haproxy/haproxy.cfg
+
+    - name: Ensure HAProxy service is started
+      command: haproxy -D -f /usr/local/etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid
+      args:
+        creates: /var/run/haproxy.pid