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limit-count

Apache APISIX

API Gateway

Limit Count

This document contains information about the Apache APISIX limit-count Plugin, you can use it to limit the number of requests to your service by a given count per time.

Description

The limit-count Plugin limits the number of requests to your service by a given count per time. The plugin is using Fixed Window algorithm.

Attributes

Name	Type	Required	Default	Valid values	Description
count	integer	True		count > 0	Maximum number of requests to allow.
time_window	integer	True		time_window > 0	Time in seconds before `count` is reset.
key_type	string	False	"var"	["var", "var_combination", "constant"]	Type of user specified key to use.
key	string	False	"remote_addr"		User specified key to base the request limiting on. If the `key_type` attribute is set to `constant`, the key will be treated as a constant value. If the `key_type` attribute is set to `var`, the key will be treated as a name of variable, like `remote_addr` or `consumer_name`. If the `key_type` is set to `var_combination`, the key will be a combination of variables, like `$remote_addr $consumer_name`. If the value of the key is empty, `remote_addr` will be set as the default key.
rejected_code	integer	False	503	[200,...,599]	HTTP status code returned when the requests exceeding the threshold are rejected.
rejected_msg	string	False		non-empty	Body of the response returned when the requests exceeding the threshold are rejected.
policy	string	False	"local"	["local", "redis", "redis-cluster"]	Rate-limiting policies to use for retrieving and increment the limit count. When set to `local` the counters will be locally stored in memory on the node. When set to `redis` counters are stored on a Redis server and will be shared across the nodes. It is done usually for global speed limiting, and setting to `redis-cluster` uses a Redis cluster instead of a single instance.
allow_degradation	boolean	False	false		When set to `true` enables Plugin degradation when the Plugin is temporarily unavailable (for example, a Redis timeout) and allows requests to continue.
show_limit_quota_header	boolean	False	true		When set to `true`, adds `X-RateLimit-Limit` (total number of requests) and `X-RateLimit-Remaining` (remaining number of requests) to the response header.
group	string	False		non-empty	Group to share the counter with. Routes configured with the same group will share the counter.
redis_host	string	required when `policy` is `redis`			Address of the Redis server. Used when the `policy` attribute is set to `redis`.
redis_port	integer	False	6379	[1,...]	Port of the Redis server. Used when the `policy` attribute is set to `redis`.
redis_username	string	False			Username use to authenticate to the Redis server for version >= 6.0, use only `redis_password` for the versions prior. Used when the `policy` is set to `redis`.
redis_password	string	False			Password of the Redis server. Used when the `policy` is set to `redis` or `redis-cluster`.
redis_ssl	boolean	False	false		If set to `true`, then uses SSL to connect to redis instance. Used when the `policy` attribute is set to `redis`.
redis_ssl_verify	boolean	False	false		If set to `true`, then verifies the validity of the server SSL certificate. Used when the `policy` attribute is set to `redis`. See tcpsock:sslhandshake.
redis_database	integer	False	0	redis_database >= 0	Selected database of the Redis server (for single instance operation or when using Redis cloud with a single entrypoint). Used when the `policy` attribute is set to `redis`.
redis_timeout	integer	False	1000	[1,...]	Timeout in milliseconds for any command submitted to the Redis server. Used when the `policy` attribute is set to `redis` or `redis-cluster`.
redis_cluster_nodes	array	required when `policy` is `redis-cluster`			Addresses of Redis cluster nodes. Used when the `policy` attribute is set to `redis-cluster`.
redis_cluster_name	string	required when `policy` is `redis-cluster`			Name of the Redis cluster service nodes. Used when the `policy` attribute is set to `redis-cluster`.
redis_cluster_ssl	boolean	False	false		If set to `true`, then uses SSL to connect to redis-cluster. Used when the `policy` attribute is set to `redis-cluster`.
redis_cluster_ssl_verify	boolean	False	false		If set to `true`, then verifies the validity of the server SSL certificate. Used when the `policy` attribute is set to `redis-cluster`.

Enabling the Plugin

You can enable the Plugin on a Route as shown below:

curl -i 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_type": "var",
            "key": "remote_addr"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:9001": 1
        }
    }
}'

You can also configure the key_type to var_combination as shown:

curl -i 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_type": "var_combination",
            "key": "$consumer_name $remote_addr"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:9001": 1
        }
    }
}'

You can also create a group to share the same counter across multiple Routes:

curl -i http://127.0.0.1:9180/apisix/admin/services/1 \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "plugins": {
        "limit-count": {
            "count": 1,
            "time_window": 60,
            "rejected_code": 503,
            "key": "remote_addr",
            "group": "services_1#1640140620"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'

Now every Route which belongs to group services_1#1640140620 (or the service with ID 1) will share the same counter.

curl -i http://127.0.0.1:9180/apisix/admin/routes/1 \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "service_id": "1",
    "uri": "/hello"
}'

curl -i http://127.0.0.1:9180/apisix/admin/routes/2 \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "service_id": "1",
    "uri": "/hello2"
}'

curl -i http://127.0.0.1:9080/hello

HTTP/1.1 200 ...

You can also share the same limit counter for all your requests by setting the key_type to constant:

curl -i http://127.0.0.1:9180/apisix/admin/services/1 \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "plugins": {
        "limit-count": {
            "count": 1,
            "time_window": 60,
            "rejected_code": 503,
            "key": "remote_addr",
            "key_type": "constant",
            "group": "services_1#1640140621"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'

The above configuration means that when the group attribute of the limit-count plugin is configured to services_1#1640140620 for multiple routes, requests to those routes will share the same counter, even if the requests come from different IP addresses.

:::note

The configuration of limit-count in the same group must be consistent. If you want to change the configuration, you need to update the value of the corresponding group at the same time.

:::

For cluster-level traffic limiting, you can use a Redis server. The counter will be shared between different APISIX nodes to achieve traffic limiting.

The example below shows how you can use the redis policy:

curl -i 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",
            "policy": "redis",
            "redis_host": "127.0.0.1",
            "redis_port": 6379,
            "redis_password": "password",
            "redis_database": 1,
            "redis_timeout": 1001
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'

Similarly you can also configure the redis-cluster policy:

curl -i 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",
            "policy": "redis-cluster",
            "redis_cluster_nodes": [
              "127.0.0.1:5000",
              "127.0.0.1:5001"
            ],
            "redis_password": "password",
            "redis_cluster_name": "redis-cluster-1"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'

Example usage

The above configuration limits to 2 requests in 60 seconds. The first two requests will work and the response headers will contain the headers X-RateLimit-Limit and X-RateLimit-Remaining and X-RateLimit-Reset, represents the total number of requests that are limited, the number of requests that can still be sent, and the number of seconds left for the counter to reset:

curl -i http://127.0.0.1:9080/index.html

HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 13175
Connection: keep-alive
X-RateLimit-Limit: 2
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 58
Server: APISIX web server

When you visit for a third time in the 60 seconds, you will receive a response with 503 code. Currently, in the case of rejection, the limit count headers is also returned:

HTTP/1.1 503 Service Temporarily Unavailable
Content-Type: text/html
Content-Length: 194
Connection: keep-alive
X-RateLimit-Limit: 2
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 58
Server: APISIX web server

You can also set a custom response by configuring the rejected_msg attribute:

HTTP/1.1 503 Service Temporarily Unavailable
Content-Type: text/html
Content-Length: 194
Connection: keep-alive
X-RateLimit-Limit: 2
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 58
Server: APISIX web server

{"error_msg":"Requests are too frequent, please try again later."}

Disable Plugin

To disable the limit-count Plugin, you can delete the corresponding JSON configuration from the Plugin configuration. APISIX will automatically reload and you do not have to restart for this to take effect.

curl http://127.0.0.1:9180/apisix/admin/routes/1 \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/index.html",
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'

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