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Add-SLB-for-kargo-cluster..md

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+1、download ansible roles and put into roles of kargo folder.
+https://github.com/devops-coop/ansible-haproxy
+https://github.com/tcomerma/ansible-keepalived
+2、add hosts in inventory 
+[ext-lb]
+test-51
+test-67
+
+[lb-kld]
+test-51
+test-67
+
+3、uncommit external LB configure
+## External LB example config
+apiserver_loadbalancer_domain_name: "elb.k8s.com"
+loadbalancer_apiserver:
+  address: 192.168.181.200
+  port: 8383
+
+4、add some sections in cluster.yml
+- hosts: ext-lb
+  any_errors_fatal: true
+  roles:
+     - role: haproxy
+       haproxy_frontends:
+       - name: 'fe-kube-apiserver'
+         ip: '192.168.181.200'
+         port: '8383'
+         maxconn: '1000'
+         default_backend: 'be-kube-apiserver'
+       haproxy_backends:
+       - name: 'be-kube-apiserver'
+         description: 'kube-apiserver is really cool'
+         servers:
+           - name: 'be-kube-apiserver-01'
+             ip: '192.168.181.51:6443'
+           - name: 'be-kube-apiserver-02'
+             ip: '192.168.181.67:6443'
+
+- hosts: lb-kld[0]
+  any_errors_fatal: true
+  roles:
+     - { role: keepalived, keepalived_shared_ip: "192.168.181.200", keepalived_role: "master" }
+
+- hosts: lb-kld[1]:!k8s-cluster
+  any_errors_fatal: true
+  roles:
+     - { role: keepalived, keepalived_shared_ip: "192.168.181.200", keepalived_role: "slave" }
+
+5 run kargo with ansible
+ulimit -n 50000
+cd ../kargo
+nohup ansible-playbook -i inventory/hosts cluster.yml -vvv  --flush-cache
+
+