增加配置ingress nodeport 负载转发的脚本与文档

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# 配置负载转发 ingress nodeport
向集群外暴露 ingress-controller 本身的服务端口80/443/8080一般有以下三种方法
- 1.部署ingress-controller时使用`hostNetwork: true`这样就可以直接使用上述端口可能与host已listen端口冲突
- 2.部署ingress-controller时使用`LoadBalancer`类型服务,需要集群支持`LoadBalancer`
- 3.部署ingress-controller时使用`nodePort`类型服务,然后在集群外使用 haproxy/f5 等配置 virtual server 集群
本文档讲解使用 haproxy 配置 ingress的 VS 集群,前提是`多主多节点集群`并且配置了自建`lb`节点
## 1.配置 lb 参数开启转发 ingress nodeport
``` bash
# 编辑 roles/lb/defaults/main.yml配置如下变量
INGRESS_NODEPORT_LB: "yes"
INGRESS_TLS_NODEPORT_LB: "yes"
```
## 2.重新配置启动LB节点服务
``` bash
$ ansible-playbook /etc/ansible/roles/lb/lb.yml
```
## 3.验证 lb 节点的 haproxy 服务配置 `/etc/haproxy/haproxy.cfg` 包含如下配置
``` bash
... 前文省略
listen kube-master
bind 0.0.0.0:8443
mode tcp
option tcplog
balance roundrobin
server 192.168.1.41 192.168.1.41:6443 check inter 2000 fall 2 rise 2 weight 1
server 192.168.1.42 192.168.1.42:6443 check inter 2000 fall 2 rise 2 weight 1
listen ingress-node
bind 0.0.0.0:80
mode tcp
option tcplog
balance roundrobin
server 192.168.1.43 192.168.1.43:23456 check inter 2000 fall 2 rise 2 weight 1
server 192.168.1.44 192.168.1.44:23456 check inter 2000 fall 2 rise 2 weight 1
listen ingress-node-tls
bind 0.0.0.0:443
mode tcp
option tcplog
balance roundrobin
server 192.168.1.43 192.168.1.43:23457 check inter 2000 fall 2 rise 2 weight 1
server 192.168.1.44 192.168.1.44:23457 check inter 2000 fall 2 rise 2 weight 1
```
验证成功后,我们可以方便的去做[配置ingress](../guide/ingress.md)和[配置https ingress](../guide/ingress-tls.md)实验了。

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- [集群备份与恢复](cluster_restore.md)
- [设置只读权限 kubeconfig](readonly_kubectl.md)
- [修改 APISERVER 证书](ch_apiserver_cert.md)
- [配置负载转发 ingress nodeport](loadballance_ingress_nodeport.md)

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# 启用 ingress NodePort服务的负载均衡 (yes/no)
INGRESS_NODEPORT_LB: "no"
# 启用 ingress tls NodePort服务的负载均衡 (yes/no)
INGRESS_TLS_NODEPORT_LB: "no"

4
roles/lb/lb.yml 100644
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- hosts: lb
roles:
- lb

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@ -40,3 +40,17 @@ listen ingress-node
server {{ host }} {{ host }}:23456 check inter 2000 fall 2 rise 2 weight 1
{% endfor %}
{% endif %}
{% if INGRESS_TLS_NODEPORT_LB == "yes" %}
listen ingress-node-tls
bind 0.0.0.0:443
mode tcp
option tcplog
balance {{ BALANCE_ALG }}
{% for host in groups['kube-node'] %}
server {{ host }} {{ host }}:23457 check inter 2000 fall 2 rise 2 weight 1
{% endfor %}
{% for host in groups['new-node'] %}
server {{ host }} {{ host }}:23457 check inter 2000 fall 2 rise 2 weight 1
{% endfor %}
{% endif %}