fix(kubernetes_ansible_templates): add j2 template files related to kubernetes installation

Author: mohammadll

app/media/kuber_configs/check_apiserveer.sh.j2

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+errorExit() {
+  echo "*** $@" 1>&2
+  exit 1
+}
+
+curl --silent --max-time 2 --insecure https://localhost:6443/ -o /dev/null || errorExit "Error GET https://localhost:6443/"
+if ip addr | grep -q {{ virtual_ip }}; then
+  curl --silent --max-time 2 --insecure https://{{ virtual_ip }}:6443/ -o /dev/null || errorExit "Error GET https://{{ virtual_ip }}:6443/"
+fi

app/media/kuber_configs/haproxy.cfg.j2

@@ -0,0 +1,28 @@
+# HAProxy Statistics Report Page
+frontend stats-frontend
+  bind *:8080
+  mode http
+  stats enable
+  stats hide-version
+  stats uri /stats
+  stats realm Haproxy\ Statistics
+  stats auth admin:{{ haproxy_frontend_password }}  # Change 'admin:password' to your desired strong username and password
+
+# No backend is required for exporting stats in HAProxy.
+
+
+frontend kubernetes-frontend
+  bind *:6443
+  mode tcp
+  option tcplog
+  default_backend kubernetes-backend
+
+backend kubernetes-backend
+  option httpchk GET /healthz
+  http-check expect status 200
+  mode tcp
+  option ssl-hello-chk
+  balance roundrobin
+{% for host in groups['k8s_masters'] %}
+    server {{ host }} {{ hostvars[host]['private_ip'] }}:6443 check fall 3 rise 2
+{% endfor %}

app/media/kuber_configs/keepalived.conf.j2

@@ -0,0 +1,26 @@
+vrrp_script check_apiserver {
+  script "/etc/keepalived/check_apiserver.sh"
+  interval 3 # check api server every 3 seconds
+  timeout 10 # timeout second if api server doesn't answered
+  fall 5 # failed time
+  rise 2 # success 2 times
+  weight -2 # if failed is done it reduce 2 of the weight
+}
+
+vrrp_instance VI_1 {
+    state BACKUP
+    interface {{ interface_name }} # set your interface
+    virtual_router_id 1
+    priority 100
+    advert_int 5
+    authentication {
+        auth_type PASS
+        auth_pass mysecret
+    }
+    virtual_ipaddress {
+        {{ virtual_ip }}
+    }
+    track_script {
+        check_apiserver
+    }
+}

app/media/kuber_configs/kubeadmcnf-join.yml.j2

@@ -0,0 +1,12 @@
+---
+apiVersion: kubeadm.k8s.io/v1beta3
+kind: JoinConfiguration
+nodeRegistration:
+  criSocket: {{ cri_socket }}
+  
+---
+kind: ClusterConfiguration
+apiVersion: kubeadm.k8s.io/v1beta3
+kubernetesVersion: "{{ k8s_version }}"
+
+

app/media/kuber_configs/kubeadmcnf.yml.j2

@@ -0,0 +1,13 @@
+kind: InitConfiguration
+apiVersion: kubeadm.k8s.io/v1beta3
+nodeRegistration:
+  criSocket: {{ cri_socket }}
+  imagePullPolicy: IfNotPresent
+---
+kind: ClusterConfiguration
+apiVersion: kubeadm.k8s.io/v1beta3
+kubernetesVersion: "{{ k8s_version }}"
+controlPlaneEndpoint: "{{ apiserver_url }}"
+certificatesDir: /etc/kubernetes/pki
+networking:
+  podSubnet: {{ pod_network_cidr }}

app/media/kuber_configs/resolv.conf.j2

@@ -0,0 +1,20 @@
+
+# {{ ansible_managed }}
+
+{% if resolv_search is defined and resolv_search | length > 0 %}
+search {{ resolv_search|join(' ') }}
+{% endif %}
+{% if resolv_domain is defined and resolv_domain != "" %}
+domain {{ resolv_domain }}
+{% endif %}
+{% for ns in resolv_nameservers %}
+nameserver {{ ns }}
+{% endfor %}
+{% if resolv_sortlist is defined and resolv_sortlist | length > 0 %}
+{% for sl in resolv_sortlist %}
+sortlist {{ sl }}
+{% endfor %}
+{% endif %}
+{% if resolv_options is defined and resolv_options | length > 0 %}
+options {{ resolv_options|join(' ') }}
+{% endif %}