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Version: 3.0

Upstream

Upstream 是虚拟主机抽象,对给定的多个服务节点按照配置规则进行负载均衡。Upstream 的地址信息可以直接配置到 Route(或 Service) 上,当 Upstream 有重复时,就需要用“引用”方式避免重复了。

如上图所示,通过创建 Upstream 对象,在 Route 用 ID 方式引用,就可以确保只维护一个对象的值了。

Upstream 的配置可以被直接绑定在指定 Route 中,也可以被绑定在 Service 中,不过 Route 中的配置优先级更高。这里的优先级行为与 Plugin 非常相似。

配置参数#

APISIX 的 Upstream 除了基本的负载均衡算法选择外,还支持对上游做主被动健康检查、重试等逻辑,具体看这个 链接

创建上游对象用例:

curl http://127.0.0.1:9180/apisix/admin/upstreams/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"type": "chash",
"key": "remote_addr",
"nodes": {
"127.0.0.1:80": 1,
"foo.com:80": 2
}
}'

上游对象创建后,均可以被具体 RouteService 引用,例如:

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/index.html",
"upstream_id": 1
}'

为了方便使用,也可以直接把上游地址直接绑到某个 RouteService ,例如:

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/index.html",
"plugins": {
"limit-count": {
"count": 2,
"time_window": 60,
"rejected_code": 503,
"key": "remote_addr"
}
},
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1980": 1
}
}
}'

下面是一个配置了健康检查的示例:

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/index.html",
"plugins": {
"limit-count": {
"count": 2,
"time_window": 60,
"rejected_code": 503,
"key": "remote_addr"
}
},
"upstream": {
"nodes": {
"127.0.0.1:1980": 1
}
"type": "roundrobin",
"retries": 2,
"checks": {
"active": {
"http_path": "/status",
"host": "foo.com",
"healthy": {
"interval": 2,
"successes": 1
},
"unhealthy": {
"interval": 1,
"http_failures": 2
}
}
}
}
}'

更多细节可以参考 健康检查的文档

下面是几个使用不同 hash_on 类型的配置示例:

Consumer#

创建一个 consumer 对象:

curl http://127.0.0.1:9180/apisix/admin/consumers -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"username": "jack",
"plugins": {
"key-auth": {
"key": "auth-jack"
}
}
}'

新建路由,打开 key-auth 插件认证,upstreamhash_on 类型为 consumer

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"plugins": {
"key-auth": {}
},
"upstream": {
"nodes": {
"127.0.0.1:1980": 1,
"127.0.0.1:1981": 1
},
"type": "chash",
"hash_on": "consumer"
},
"uri": "/server_port"
}'

测试请求,认证通过后的 consumer_name 将作为负载均衡哈希算法的哈希值:

curl http://127.0.0.1:9080/server_port -H "apikey: auth-jack"
Cookie#

新建路由和 Upstreamhash_on 类型为 cookie

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/hash_on_cookie",
"upstream": {
"key": "sid",
"type": "chash",
"hash_on": "cookie",
"nodes": {
"127.0.0.1:1980": 1,
"127.0.0.1:1981": 1
}
}
}'

客户端请求携带 Cookie

 curl http://127.0.0.1:9080/hash_on_cookie -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -H "Cookie: sid=3c183a30cffcda1408daf1c61d47b274"
Header#

新建路由和 Upstreamhash_on 类型为 headerkeycontent-type

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/hash_on_header",
"upstream": {
"key": "content-type",
"type": "chash",
"hash_on": "header",
"nodes": {
"127.0.0.1:1980": 1,
"127.0.0.1:1981": 1
}
}
}'

客户端请求携带 content-typeheader

 curl http://127.0.0.1:9080/hash_on_header -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -H "Content-Type: application/json"