switch

switch #

描述 #

switch 过滤器用来将流量按照请求路径转发到另外的一个处理流程,可以方便的实现跨集群操作,且 Elasticsearch 集群不需要做任何修改,且各个集群内所有的 API 都可以访问,包括索引的读写和集群操作。

配置示例 #

一个简单的示例如下:

flow:
  - name: es1-flow
    filter:
      - elasticsearch:
          elasticsearch: es1
  - name: es2-flow
    filter:
      - elasticsearch:
          elasticsearch: es2
  - name: cross_cluste_search
    filter:
      - switch:
          path_rules:
            - prefix: "es1:"
              flow: es1-flow
            - prefix: "es2:"
              flow: es2-flow
      - elasticsearch:
          elasticsearch: dev  #elasticsearch configure reference name

上面的例子中,以 es1: 开头的索引将转发给集群 es1 集群,以 es2: 开头的索引转发给 es2 集群,不匹配的转发给 dev 集群,在一个 Kibana 里面可以直接操作不同版本的集群了,如下:

# GET es1:_cluster/health
{
  "cluster_name" : "elasticsearch",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 37,
  "active_shards" : 37,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 9,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent_as_number" : 80.43478260869566
}

# GET es2:_cluster/health
{
  "cluster_name" : "elasticsearch",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 6,
  "active_shards" : 6,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 6,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent_as_number" : 50.0
}

通过命令行也同样可以:

root@infini:/opt/gateway# curl -v  192.168.3.4:8000/es1:_cat/nodes
*   Trying 192.168.3.4...
* TCP_NODELAY set
* Connected to 192.168.3.4 (192.168.3.4) port 8000 (#0)
> GET /es1:_cat/nodes HTTP/1.1
> Host: 192.168.3.4:8000
> User-Agent: curl/7.58.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Server: INFINI
< Date: Thu, 14 Oct 2021 10:37:39 GMT
< content-type: text/plain; charset=UTF-8
< Content-Length: 45
< X-Backend-Cluster: dev1
< X-Backend-Server: 192.168.3.188:9299
< X-Filters: filters->switch->filters->elasticsearch->skipped
< 
192.168.3.188 48 38 5    cdhilmrstw * LENOVO
* Connection #0 to host 192.168.3.4 left intact
root@infini:/opt/gateway# curl -v  192.168.3.4:8000/es2:_cat/nodes
*   Trying 192.168.3.4...
* TCP_NODELAY set
* Connected to 192.168.3.4 (192.168.3.4) port 8000 (#0)
> GET /es2:_cat/nodes HTTP/1.1
> Host: 192.168.3.4:8000
> User-Agent: curl/7.58.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Server: INFINI
< Date: Thu, 14 Oct 2021 10:37:48 GMT
< content-type: text/plain; charset=UTF-8
< Content-Length: 146
< X-elastic-product: Elasticsearch
< Warning: 299 Elasticsearch-7.14.0-dd5a0a2acaa2045ff9624f3729fc8a6f40835aa1 "Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.14/security-minimal-setup.html to enable security."
< X-Backend-Cluster: dev
< X-Backend-Server: 192.168.3.188:9216
< X-Filters: filters->switch->filters->elasticsearch->skipped
< 
192.168.3.188 26 38 3    cdfhilmrstw - node-714-1
192.168.3.188 45 38 3    cdfhilmrstw * LENOVO
192.168.3.188 43 38 4    cdfhilmrstw - node-714-2
* Connection #0 to host 192.168.3.4 left intact

参数说明 #

名称类型说明
path_rulesarray根据 URL 路径的匹配规则
path_rules.prefixstring匹配的前缀字符串,建议以 : 结尾,匹配之后会移除该 URL 前缀转发给后面的 flow。
path_rules.flowstring匹配之后用于处理该请求的 flow 名称。
remove_prefixbool转发请求之前,是否移除前缀匹配上的字符串,默认 true