kube-proxy loadbalancing, need an external loadbalancer

environments/test/group_vars/all.yml

@@ -69,3 +69,18 @@ dns_domain: "{{ cluster_name }}"
 #
 # # Ip address of the kubernetes dns service
 dns_server: "{{ kube_service_addresses|ipaddr('net')|ipaddr(253)|ipaddr('address') }}"
+
+# For multi masters architecture:
+# kube-proxy doesn't support multiple apiservers for the time being so you'll need to configure your own loadbalancer
+# This domain name will be inserted into the /etc/hosts file of all servers
+# configurationexample with haproxy :
+# lissten kubernetes-apiserver-https
+#   bind 10.99.0.21:8383
+#    option ssl-hello-chk
+#    mode tcp
+#    timeout client 3h
+#    timeout server 3h
+#    server master1 10.99.0.26:443
+#    server master2 10.99.0.27:443
+#    balance roundrobin
+apiserver_loadbalancer_domain_name: "lb-apiserver.kubernetes.local"

environments/test/inventory.example

@@ -17,18 +17,10 @@
 10.99.0.4 local_as=xxxxxxxx
 10.99.0.5 local_as=xxxxxxxx
 
-[usa]
+[new-york]
 10.99.0.36 local_as=xxxxxxxx
 10.99.0.37 local_as=xxxxxxxx
 
 [k8s-cluster:children]
 kube-node
 kube-master
-
-[paris:vars]
-peers=[{"router_id": "10.99.0.2", "as": "65xxx"}, {"router_id": "10.99.0.3", "as": "65xxx"}]
-loadbalancer_address="10.99.0.24"
-
-[usa:vars]
-peers=[{"router_id": "10.99.0.34", "as": "65xxx"}, {"router_id": "10.99.0.35", "as": "65xxx"}]
-loadbalancer_address="10.99.0.44"

roles/dnsmasq/tasks/main.yml

@@ -8,6 +8,14 @@
   when: hostvars[item].ansible_default_ipv4.address is defined
   with_items: groups['all']
 
+- name: populate kubernetes loadbalancer address into hosts file
+  lineinfile:
+    dest: /etc/hosts
+    regexp: ".*{{ apiserver_loadbalancer_domain_name }}$"
+    line: "{{ loadbalancer_apiserver.address }} lb-apiserver.kubernetes.local"
+    state: present
+  when: loadbalancer_apiserver is defined
+
 - name: clean hosts file
   lineinfile:
     dest: /etc/hosts

roles/kubernetes/node/templates/manifests/kube-proxy.manifest.j2

@@ -15,7 +15,11 @@ spec:
 {% if inventory_hostname in groups['kube-master'] %}
     - --master=http://127.0.0.1:8080
 {% else %}
-    - --master=https://{{ groups['kube-master'][0] }}:{{kube_apiserver_port }} 
+{%   if loadbalancer_apiserver.address is defined | default('') %}
+    - --master=https://{{ apiserver_loadbalancer_domain_name }}:{{ loadbalancer_apiserver.port }}
+{%   else %}
+    - --master=https://{{ groups['kube-master'][0] }}:{{ kube_apiserver_port }}
+{%   endif%}
     - --kubeconfig=/etc/kubernetes/node-kubeconfig.yaml
 {% endif %}
     securityContext:

roles/kubernetes/node/templates/openssl.conf.j2

@@ -10,12 +10,9 @@ subjectAltName = @alt_names
 DNS.1 = kubernetes
 DNS.2 = kubernetes.default
 DNS.3 = kubernetes.default.svc.{{ dns_domain }}
+DNS.4 = {{ apiserver_loadbalancer_domain_name }}
 {% for host in groups['kube-master'] %}
 IP.{{ loop.index }} = {{ hostvars[host]['ip'] | default(hostvars[host]['ansible_default_ipv4']['address']) }}
 {% endfor %}
 {% set idx =  groups['kube-master'] | length | int + 1 %}
 IP.{{ idx | string }} = {{ kube_apiserver_ip }}
-{% if loadbalancer_address is defined | default('') %}
-{% set idx =  idx | int + 1 %}
-IP.{{ idx | string }} = {{ loadbalancer_address }}
-{% endif %}