apisix与consul服务发现的结合使用

首先简单介绍一下apisix,是一个机遇openresty开发的云原生网关。功能类比于nginx+upsync 可无reload，apisix支持自身配置放在etcd中，原生高可用架构。并且支持 consul eruka nacos。

实践逻辑如下

安装以下实验环境

以下三个点作为验证环境的安装步骤。

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1.安装好apisix以及相关依赖(openresty,etcd)
2.安装好consul组件作为服务注册与发现。
3.run demo案例作为业务服务。

验证逻辑

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1.run demo代码,本身是一个http服务,并且把自己注册到consul中,持续健康检查监听。
2.访问 demo的http服务发现可访问
3.在apisix中创建url,后端服务对应demo注册到consul的servername。
4.使用apisix创建的url访问服务，发现访问结果与之前一致。

Install Consul

  1. download consul

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    wget https://releases.hashicorp.com/consul/1.7.3/consul_1.7.3_linux_amd64.zip

  2. unzip to /usr/bin 

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sudo unzip consul_1.7.3_linux_amd64.zip -d /usr/bin

  1. create consul service file

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    sudo vim /lib/systemd/system/consul.service

    [Unit]
    Description=consul
    [Service]
    ExecStart=/usr/bin/consul agent -config-dir /etc/consul
    KillSignal=SIGINT

  2. create server json file

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    sudo mkdir /etc/consul/

    sudo vim /etc/consul/server.json

    {
    	"data_dir": "/var/consul",
    	"log_level": "INFO",
    	"node_name": "test",
    	"server": true,
    	"ui": true,
    	"bootstrap_expect": 1,
    	"client_addr": "0.0.0.0",
    	"advertise_addr": "127.0.0.1",
    	"ports": {
    		"dns": 53
    	},	
    	"advertise_addr_wan": "127.0.0.1"
    }

  3. start consul

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    sudo systemctl start consul

start service - golang version

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git clone https://github.com/api7/consul-test-golang.git

yum -y install glang 

go env -w GO111MODULE=on

go env -w GOPROXY=https://goproxy.io,direct


cd consul-test-golang

nohup go run main.go &

install etcd – need by Apache APISIX

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sudo yum install etcd

nohup /usr/bin/etcd --enable-v2=true &

install openresty – need by Apache APISIX

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wget https://openresty.org/package/centos/openresty.repo

sudo mv openresty.repo /etc/yum.repos.d/

sudo yum install openresty -y

install Apache APISIX

  1. install from RPM, and you can get the latest version from https://github.com/apache/incubator-apisix/releases
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wget https://github.com/apache/incubator-apisix/releases/download/1.3/apisix-1.3-0.el7.noarch.rpm

sudo yum install apisix-1.3-0.el7.noarch.rpm -y
  1. change config.yaml

vi /usr/local/apisix/conf/config.yaml

add consul address to dns_resolver：

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dns_resolver:
 - 127.0.0.1
  1. start Apache APISIX:
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    sudo apisix start

Test

  1. add route in Apache APISIX:
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    curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -i -d '
    {
        "uri": "/healthz",
        "upstream": {
            "type": "roundrobin",
            "nodes": {
                "go-consul-test.service.consul:8080": 1
            }
        }
    }'

go-consul-test.service.consul is registered DNS SRV by consul-test-golang service

  1. test：
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curl http://127.0.0.1:8080/healthz | jq

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curl http://127.0.0.1:9080/healthz | jq

能看该运行的demo已经被apisix给封装起来了。

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