1. 在configmap中添加多个主机

在nginx-ingress-controller的configmap中添加多个主机：

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-ingress-controller
  namespace: ingress
data:
  use-proxy-protocol: "true"
  use-forwarded-headers: "true"
  log-format: '{"time": "$time_iso8601", '...
  proxy-read-timeout: "600"
  proxy-send-timeout: "600"
  proxy-body-size: "256m"
  proxy-buffering: "off"
  proxy-buffer-size: "4k"
  service-node-port-range: "20000-32767"
  proxy-real-ip-cidr: "10.0.0.0/8"
  enable-leader-election: "false"
  default-ssl-certificate: ingress/tls-secret
  client-max-body-size: "128m"
  client-body-buffer-size: "128m"
  real-ip-header: "x-real-ip"
  secure-backends: "false"
  ssl-protocols: "TLSv1.2 TLSv1.3"
  ssl-ciphers: "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384"
  worker-processes: "2"
  use-http2: "true"
  server-tokens: "false"
  config:
    use-forwarded-headers: "true"
    server-snippets: |
      location / {
        if ($http_host = "host1.example.com") {
          proxy_pass http://backend1;
        }
        if ($http_host = "host2.example.com") {
          proxy_pass http://backend2;
        }
      }

以上configmap添加了两个主机host1.example.com和`