APISIX的安装和简单使用

APISIX 是一个云原生、高性能、可扩展的微服务 API 网关。
它是基于 Nginx 和 etcd 来实现，和传统 API 网关相比，APISIX 具备动态路由和插件热加载，特别适合微服务体系下的 API 管理。

APISIX安装

首先安装依赖
https://github.com/apache/incubator-apisix/blob/master/doc/zh-cn/install-dependencies.md

# 安装 OpenResty, etcd 和 编译工具
sudo yum install -y etcd openresty curl git gcc luarocks lua-devel

# 开启 etcd server
sudo service etcd start

依赖openresty的新版本 OpenResty 1.15.8.3。检查下etcd是否已经正常启动。

ps aux | grep etcd
etcd      2769  2.2  4.2 10856200 21364 ?      Ssl  14:54   0:00 /usr/bin/etcd --name=default --data-dir=/var/lib/etcd/default.etcd --listen-client-urls=http://localhost:2379

可以看到，监听的端口号是2379.也可以看下etcd的配置，也可以看到端口号。

/etc/etcd/etcd.conf

接下来安装主角apisix
官方安装yum安装
sudo yum install -y https://github.com/apache/incubator-apisix/releases/download/1.3/apisix-1.3-0.el7.noarch.rpm
发现下载不下来，直接下载rpm包手动安装。

https://github.com/apache/incubator-apisix/releases/download/1.3/apisix-1.3-0.el7.noarch.rpm

手动安装，并且启动apisix

rpm -ivh apisix-1.3-0.el7.noarch.rpm
准备中...                          ################################# [100%]
正在升级/安装...
   1:apisix-1.3-0                     ################################# [100%]
apisix start

检查下apisix是否启动成功

ps aux | grep nginx
root      2978  0.0  0.5 178996  2616 ?        Ss   08:14   0:00 nginx: master process openresty -p /usr/local/apisix -c /usr/local/apisix/conf/nginx.conf
nobody    2979  0.6  2.4 191600 12368 ?        R    08:14   0:00 nginx: worker process
nobody    2980  0.1  0.4 173672  2120 ?        S    08:14   0:00 nginx: cache manager process
nobody    2981  0.0  0.4 173672  2120 ?        S    08:14   0:00 nginx: cache loader process

启动成功，也可以到apisix的Nginx conf的配置路径。

APISIX简单使用

这是官方的入门指南
https://github.com/apache/incubator-apisix/blob/master/doc/zh-cn/getting-started.md

我们先配置下upstream

curl "http://127.0.0.1:9080/apisix/admin/upstreams/50" -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
> {
>     "type": "roundrobin",
>     "nodes": {
>         "127.0.0.1:7080": 1
>     }
> }'
{"node":{"value":{"type":"roundrobin","nodes":{"127.0.0.1:7080":1},"hash_on":"vars","id":"50"},"createdIndex":22,"key":"\/apisix\/upstreams\/50","modifiedIndex":22},"prevNode":{"value":"{\"hash_on\":\"vars\",\"id\":\"50\",\"nodes\":{\"httpbin.org:80\":1},\"type\":\"roundrobin\"}","createdIndex":19,"key":"\/apisix\/upstreams\/50","modifiedIndex":19},"action":"set"}

再给刚刚配置的upstream配置router

curl "http://127.0.0.1:9080/apisix/admin/routes/5" -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
> {
>     "uri": "/get",
>     "host": "httpbin.org",
>     "upstream_id": 50
> }'
{"node":{"value":{"host":"httpbin.org","upstream_id":50,"uri":"\/get","priority":0},"createdIndex":25,"key":"\/apisix\/routes\/5","modifiedIndex":25},"prevNode":{"value":"{\"host\":\"httpbin.org\",\"plugins\":{\"proxy-rewrite\":{\"scheme\":\"https\"}},\"uri\":\"\\\/get\",\"upstream_id\":50,\"priority\":0}","createdIndex":24,"key":"\/apisix\/routes\/5","modifiedIndex":24},"action":"set"}

现在的流程就是这样的的。
终端请求httpbin.org/get->APISIX代理-> 127.0.0.1:7080

我们再启动一个Nginx服务，使得上游服务 127.0.0.1:7080/get 可以正常提供服务。

vim /usr/local/openresty/nginx/conf/nginx.conf
添加7080的端口服务
    server {
        listen       7080;
        location /get {
            echo "success";
        }
    }

启动Nginx WEB服务
sudo /usr/local/openresty/nginx/sbin/nginx -c /usr/local/openresty/nginx/conf/nginx.conf

curl 'http://127.0.0.1:7080/get'
success
说明7080能够正常提供服务了

我们在终端试下是否代理成功

curl -i -X GET "http://127.0.0.1:9080/get?foo1=bar1&foo2=bar2" -H "Host: httpbin.org"
HTTP/1.1 200 OK
Content-Type: application/octet-stream
Transfer-Encoding: chunked
Connection: keep-alive
Server: APISIX web server
Date: Sun, 28 Jun 2020 15:52:03 GMT

success

打印了success，说明整个网络流程是通畅的。

APISIX控制台安装

新版本的APISIX已经内置了dashboard可视化WEB控制台，可以很直观的看到各种router配置、upstream配置等等。
浏览器直接访问就可以打开dashboard
http://127.0.0.1:9080/apisix/dashboard

出现下面的报错，可能是etced服务忘记启动了

connection refused

启动下etcd服务就正常了
service etcd start
如果是虚拟机或者docker机器的话，可能需要打开admin的访问显示

vim /usr/local/apisix/conf/config.yaml
找到 allow_admin
- 127.0.0.0/24 该为 - all
就是允许所有IP访问，生产环境可不能这样，有非常大的安全风险

正常访问 http://127.0.0.1:9080/apisix/dashboard 就能在左侧的Routes 和 Upstream 看到上面用curl设置的routes和upstream。

etcd 命令行简单使用

etcd 是一个分布式、可靠的 key-value 存储的分布式系统，主要用于服务发现。最著名的k8s就是用etcd存储配置数据的。
命令行主要使用 etcdctl 执行 etcd 命令,先看下帮助菜单

etcdctl -h
NAME:
   etcdctl - A simple command line client for etcd.

WARNING:
   Environment variable ETCDCTL_API is not set; defaults to etcdctl v2.
   Set environment variable ETCDCTL_API=3 to use v3 API or ETCDCTL_API=2 to use v2 API.

USAGE:
   etcdctl [global options] command [command options] [arguments...]

VERSION:
   3.3.11

COMMANDS:
     backup          backup an etcd directory
     cluster-health  check the health of the etcd cluster
     mk              make a new key with a given value
     mkdir           make a new directory
     rm              remove a key or a directory
     rmdir           removes the key if it is an empty directory or a key-value pair
     get             retrieve the value of a key
     ls              retrieve a directory
     set             set the value of a key
     setdir          create a new directory or update an existing directory TTL
     update          update an existing key with a given value
     updatedir       update an existing directory
     watch           watch a key for changes
     exec-watch      watch a key for changes and exec an executable
     member          member add, remove and list subcommands
     user            user add, grant and revoke subcommands
     role            role add, grant and revoke subcommands
     auth            overall auth controls

最常用几个命令 ls get set rm rmdir mk mkdir等等，名字都比较通俗易懂。

etcdctl ls
/apisix

etcdctl ls /apisix
/apisix/upstreams
/apisix/node_status
/apisix/ssl
/apisix/routes
/apisix/services

etcdctl ls /apisix/upstreams
/apisix/upstreams/50

etcdctl get /apisix/upstreams/50
{"hash_on":"vars","id":"50","nodes":{"127.0.0.1:7080":1},"type":"roundrobin"}