Add Kubelet config, remove deprecated flags and fix minor bugs (#4724)

* Add kubelet config

* Change kubelet_authorization_mode_webhook to true

* Fix lint

* Sync env file

* Refactor the kubernetes node folder

* Remove deprecated flag and fix lint

roles/kubernetes/node/templates/loadbalancer/haproxy.cfg.j2

@@ -0,0 +1,43 @@
+global
+    maxconn                 4000
+    log                     127.0.0.1 local0
+
+defaults
+    mode                    http
+    log                     global
+    option                  httplog
+    option                  dontlognull
+    option                  http-server-close
+    option                  redispatch
+    retries                 5
+    timeout http-request    5m
+    timeout queue           5m
+    timeout connect         30s
+    timeout client          15m
+    timeout server          15m
+    timeout http-keep-alive 30s
+    timeout check           30s
+    maxconn                 4000
+
+{% if loadbalancer_apiserver_healthcheck_port is defined -%}
+frontend healthz
+  bind *:{{ loadbalancer_apiserver_healthcheck_port }}
+  mode http
+  monitor-uri /healthz
+{% endif %}
+
+frontend kube_api_frontend
+  bind 127.0.0.1:{{ loadbalancer_apiserver_port|default(kube_apiserver_port) }}
+  mode tcp
+  option tcplog
+  default_backend kube_api_backend
+
+backend kube_api_backend
+  mode tcp
+  balance leastconn
+  default-server inter 15s downinter 15s rise 2 fall 2 slowstart 60s maxconn 1000 maxqueue 256 weight 100
+  option httpchk GET /healthz
+  http-check expect status 200
+  {% for host in groups['kube-master'] -%}
+  server {{ host }} {{ hostvars[host]['access_ip'] | default(hostvars[host]['ip'] | default(fallback_ips[host])) }}:{{ kube_apiserver_port }} check check-ssl verify none
+  {% endfor -%}

roles/kubernetes/node/templates/loadbalancer/nginx.conf.j2

@@ -0,0 +1,50 @@
+error_log stderr notice;
+
+worker_processes 2;
+worker_rlimit_nofile 130048;
+worker_shutdown_timeout 10s;
+
+events {
+  multi_accept on;
+  use epoll;
+  worker_connections 16384;
+}
+
+stream {
+  upstream kube_apiserver {
+    least_conn;
+    {% for host in groups['kube-master'] -%}
+    server {{ hostvars[host]['access_ip'] | default(hostvars[host]['ip'] | default(fallback_ips[host])) }}:{{ kube_apiserver_port }};
+    {% endfor -%}
+  }
+
+  server {
+    listen        127.0.0.1:{{ loadbalancer_apiserver_port|default(kube_apiserver_port) }};
+    proxy_pass    kube_apiserver;
+    proxy_timeout 10m;
+    proxy_connect_timeout 1s;
+  }
+}
+
+http {
+  aio threads;
+  aio_write on;
+  tcp_nopush on;
+  tcp_nodelay on;
+
+  keepalive_timeout 75s;
+  keepalive_requests 100;
+  reset_timedout_connection on;
+  server_tokens off;
+  autoindex off;
+
+  {% if loadbalancer_apiserver_healthcheck_port is defined -%}
+  server {
+    listen {{ loadbalancer_apiserver_healthcheck_port }};
+    location /healthz {
+      access_log off;
+      return 200;
+    }
+  }
+  {% endif %}
+}