什么是 Kong
Kong 是在客户端和（微）服务间转发API通信的API网关。
下图是使用 Kong 前后的技术架构对比：
在 Centos 上安装 Kong
官方文档：点我
Kong 支持安装在多个平台上，本文以 Centos为例。
下载软件包
Centos6：https://bintray.com/kong/kong-rpm/download_file?file_path=centos/6/kong-1.3.0.el6.amd64.rpm
Centos7：https://bintray.com/kong/kong-rpm/download_file?file_path=centos/7/kong-1.3.0.el7.amd64.rpm
安装
`sudo yum install kong-1.3.0.*.noarch.rpm --nogpgcheck` 配置 Kong
无数据库模式
无论有没有数据库，Kong 都可以运行。
/etc/kong/kong.conf 中配置数据库：
``database = off # Determines which of PostgreSQL or Cassandra
# this node will use as its datastore.
# Accepted values are `postgres`,
# `cassandra`, and `off`.`` 选择一个文件夹，生成配置：
`kong config init` 会在当前目录下生成 kong.yml 文件。
有数据库模式
使用有数据库模式时，可以方便的配合 Konga 管理 Service。
Kong 支持 PostgreSQL 9.5+ 和 Cassandra 3.x.x 作为其数据存储。
我们使用 PostgreSQL。
/etc/kong/kong.conf 中配置数据库：
``database = postgres # Determines which of PostgreSQL or Cassandra
# this node will use as its datastore.
# Accepted values are `postgres`,
# `cassandra`, and `off`.
pg_host = 127.0.0.1 # Host of the Postgres server.
pg_port = 5432 # Port of the Postgres server.
pg_timeout = 5000 # Defines the timeout (in ms), for connecting,
# reading and writing.
pg_user = kong # Postgres user.
pg_password = # Postgres user's password.
pg_database = kong # The database name to connect to.`` 执行数据库迁移：
`kong migrations bootstrap [-c /path/to/kong.conf]` 输出：
Bootstrapping database...
migrating core on database 'kong'...
core migrated up to: 000_base (executed)
core migrated up to: 003_100_to_110 (executed)
core migrated up to: 004_110_to_120 (executed)
core migrated up to: 005_120_to_130 (executed)
core migrated up to: 006_130_to_140 (executed)
core migrated up to: 007_140_to_150 (executed)
core migrated up to: 008_150_to_200 (executed)
core migrated up to: 009_200_to_210 (executed)
core migrated up to: 010_210_to_211 (executed)
core migrated up to: 011_212_to_213 (executed)
core migrated up to: 012_213_to_220 (executed)
core migrated up to: 013_220_to_230 (executed)
migrating rate-limiting on database 'kong'...
rate-limiting migrated up to: 000_base_rate_limiting (executed)
rate-limiting migrated up to: 003_10_to_112 (executed)
rate-limiting migrated up to: 004_200_to_210 (executed)
migrating hmac-auth on database 'kong'...
hmac-auth migrated up to: 000_base_hmac_auth (executed)
hmac-auth migrated up to: 002_130_to_140 (executed)
hmac-auth migrated up to: 003_200_to_210 (executed)
migrating oauth2 on database 'kong'...
oauth2 migrated up to: 000_base_oauth2 (executed)
oauth2 migrated up to: 003_130_to_140 (executed)
oauth2 migrated up to: 004_200_to_210 (executed)
oauth2 migrated up to: 005_210_to_211 (executed)
migrating ip-restriction on database 'kong'...
ip-restriction migrated up to: 001_200_to_210 (executed)
migrating jwt on database 'kong'...
jwt migrated up to: 000_base_jwt (executed)
jwt migrated up to: 002_130_to_140 (executed)
jwt migrated up to: 003_200_to_210 (executed)
migrating basic-auth on database 'kong'...
basic-auth migrated up to: 000_base_basic_auth (executed)
basic-auth migrated up to: 002_130_to_140 (executed)
basic-auth migrated up to: 003_200_to_210 (executed)
migrating key-auth on database 'kong'...
key-auth migrated up to: 000_base_key_auth (executed)
key-auth migrated up to: 002_130_to_140 (executed)
key-auth migrated up to: 003_200_to_210 (executed)
migrating session on database 'kong'...
session migrated up to: 000_base_session (executed)
session migrated up to: 001_add_ttl_index (executed)
migrating acl on database 'kong'...
acl migrated up to: 000_base_acl (executed)
acl migrated up to: 002_130_to_140 (executed)
acl migrated up to: 003_200_to_210 (executed)
acl migrated up to: 004_212_to_213 (executed)
migrating response-ratelimiting on database 'kong'...
response-ratelimiting migrated up to: 000_base_response_rate_limiting (executed)
migrating bot-detection on database 'kong'...
bot-detection migrated up to: 001_200_to_210 (executed)
migrating acme on database 'kong'...
acme migrated up to: 000_base_acme (executed)
41 migrations processed
41 executed
Database is up-to-date启动 Kong
生成一份配置文件：
`cp /etc/kong/kong.conf.default /etc/kong/kong.conf` 启动：
`kong start -c /etc/kong/kong.conf` 检测是否正常运行
`curl -i http://localhost:8001/` 正常情况下的输出：
`HTTP/1.1 200 OK
Date: Thu, 18 Mar 2021 03:34:10 GMT
Content-Type: application/json; charset=utf-8
Connection: keep-alive
Access-Control-Allow-Origin: *
Content-Length: 10596
X-Kong-Admin-Latency: 3
Server: kong/2.3.3
{"plugins":{"enabled_in_cluster":[],"available_on_server":{"grpc-web":true,"correlation-id":true,"pre-function":true,"cors":true,"rate-limiting":true,"loggly":true,"hmac-auth":true,"zipkin":true,"request-size-limiting":true,"azure-functions":true,"request-transformer":true,"oauth2":true,"response-transformer":true,"ip-restriction":true,"statsd":true,"jwt":true,"proxy-cache":true,"basic-auth":true,"key-auth":true,"http-log":true,"session":true,"datadog":true,"tcp-log":true,"prometheus":true,"post-function":true,"ldap-auth":true,"acl":true,"grpc-gateway":true,"file-log":true,"syslog":true,"udp-log":true,"response-ratelimiting":true,"aws-lambda":true,"bot-detection":true,"acme":true,"request-termination":true}},"tagline":"Welcome to kong","configuration":{"pluginserver......` 这段 json 是 Kong 的运行状态数据。
原文链接：https://www.sdk.cn/details/voY208AKXddA6L1We9
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