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145 lines
3.9 KiB
Markdown
145 lines
3.9 KiB
Markdown
---
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title: zookeeper
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---
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<!--
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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-->
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## Service Discovery Via Zookeeper
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`Zookeeper` service discovery needs to rely on the [apisix-seed](https://github.com/api7/apisix-seed) project.
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### How `apisix-seed` Works
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`apisix-seed` completes data exchange by watching the changes of `etcd` and `zookeeper` at the same time.
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The process is as follows:
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1. `APISIX` registers an upstream and specifies the service discovery type as `zookeeper` to `etcd`.
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2. `apisix-seed` watches the resource changes of `APISIX` in `etcd` and filters the discovery type and obtains the service name.
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3. `apisix-seed` binds the service to the `etcd` resource and starts watching the service in zookeeper.
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4. The client registers the service with `zookeeper`.
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5. `apisix-seed` gets the service changes in `zookeeper`.
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6. `apisix-seed` queries the bound `etcd` resource information through the service name, and writes the updated service node to `etcd`.
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7. The `APISIX` worker watches `etcd` changes and refreshes the service node information to the memory.
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### Setting `apisix-seed` and Zookeeper
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The configuration steps are as follows:
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1. Start the Zookeeper service
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```bash
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docker run -itd --rm --name=dev-zookeeper -p 2181:2181 zookeeper:3.7.0
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```
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2. Download and compile the `apisix-seed` project.
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```bash
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git clone https://github.com/api7/apisix-seed.git
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cd apisix-seed
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go build
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```
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3. Modify the `apisix-seed` configuration file, config path `conf/conf.yaml`.
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```bash
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etcd: # APISIX ETCD Configure
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host:
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- "http://127.0.0.1:2379"
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prefix: /apisix
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timeout: 30
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discovery:
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zookeeper: # Zookeeper Service Discovery
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hosts:
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- "127.0.0.1:2181" # Zookeeper service address
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prefix: /zookeeper
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weight: 100 # default weight for node
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timeout: 10 # default 10s
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```
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4. Start `apisix-seed` to monitor service changes
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```bash
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./apisix-seed
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```
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### Setting `APISIX` Route and Upstream
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Set a route, the request path is `/zk/*`, the upstream uses zookeeper as service discovery, and the service name
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is `APISIX-ZK`.
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 \
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-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -i -d '
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{
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"uri": "/zk/*",
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"upstream": {
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"service_name": "APISIX-ZK",
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"type": "roundrobin",
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"discovery_type": "zookeeper"
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}
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}'
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```
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### Register Service and verify Request
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1. Service registration using Zookeeper CLI
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- Register Service
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```bash
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# Login Container
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docker exec -it ${CONTAINERID} /bin/bash
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# Login Zookeeper Client
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oot@ae2f093337c1:/apache-zookeeper-3.7.0-bin# ./bin/zkCli.sh
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# Register Service
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[zk: localhost:2181(CONNECTED) 0] create /zookeeper/APISIX-ZK '{"host":"127.0.0.1:1980","weight":100}'
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```
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- Successful Response
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```bash
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Created /zookeeper/APISIX-ZK
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```
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2. Verify Request
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- Request
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```bash
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curl -i http://127.0.0.1:9080/zk/hello
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```
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- Response
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```bash
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HTTP/1.1 200 OK
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Connection: keep-alive
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Content-Type: text/html; charset=utf-8
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Date: Tue, 29 Mar 2022 08:51:28 GMT
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Server: APISIX/2.12.0
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Transfer-Encoding: chunked
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hello
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```
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