syslog.md

title	keywords	description
syslog	Apache APISIX API Gateway Plugin Syslog	This document contains information about the Apache APISIX syslog Plugin.

Description

The syslog Plugin is used to push logs to a Syslog server.

Logs can be set as JSON objects.

Attributes

Name	Type	Required	Default	Valid values	Description
host	string	True			IP address or the hostname of the Syslog server.
port	integer	True			Target port of the Syslog server.
name	string	False	"sys logger"		Identifier for the server.
timeout	integer	False	3000	[1, ...]	Timeout in ms for the upstream to send data.
tls	boolean	False	false		When set to true performs TLS verification.
flush_limit	integer	False	4096	[1, ...]	Maximum size of the buffer (KB) and the current message before it is flushed and written to the server.
drop_limit	integer	False	1048576		Maximum size of the buffer (KB) and the current message before the current message is dropped because of the size limit.
sock_type	string	False	"tcp"	["tcp", "udp]	Transport layer protocol to use.
pool_size	integer	False	5	[5, ...]	Keep-alive pool size used by sock:keepalive.
log_format	object	False	{"host": "$host", "@timestamp": "$time_iso8601", "client_ip": "$remote_addr"}		Log format declared as key value pairs in JSON format. Values only support strings. APISIX or Nginx variables can be used by prefixing the string with $.
include_req_body	boolean	False	false		When set to true includes the request body in the log.

This Plugin supports using batch processors to aggregate and process entries (logs/data) in a batch. This avoids the need for frequently submitting the data. The batch processor submits data every 5 seconds or when the data in the queue reaches 1000. See Batch Processor for more information or setting your custom configuration.

Metadata

You can also set the format of the logs by configuring the Plugin metadata. The following configurations are available:

Name	Type	Required	Default	Description
log_format	object	False	{"host": "$host", "@timestamp": "$time_iso8601", "client_ip": "$remote_addr"}	Log format declared as key value pairs in JSON format. Values only support strings. APISIX or Nginx variables can be used by prefixing the string with $.

:::info IMPORTANT

Configuring the Plugin metadata is global in scope. This means that it will take effect on all Routes and Services which use the syslog Plugin.

:::

The example below shows how you can configure through the Admin API:

curl http://127.0.0.1:9180/apisix/admin/plugin_metadata/syslog -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "log_format": {
        "host": "$host",
        "@timestamp": "$time_iso8601",
        "client_ip": "$remote_addr"
    }
}'

With this configuration, your logs would be formatted as shown below:

{"host":"localhost","@timestamp":"2020-09-23T19:05:05-04:00","client_ip":"127.0.0.1","route_id":"1"}
{"host":"localhost","@timestamp":"2020-09-23T19:05:05-04:00","client_ip":"127.0.0.1","route_id":"1"}

Enabling the Plugin

The example below shows how you can enable the Plugin for a specific Route:

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "plugins": {
        "syslog": {
                "host" : "127.0.0.1",
                "port" : 5044,
                "flush_limit" : 1
            }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    },
    "uri": "/hello"
}'

Example usage

Now, if you make a request to APISIX, it will be logged in your Syslog server:

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

Disable Plugin

To disable the syslog 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": "/hello",
    "plugins": {},
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'