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syslog

Description#

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

Logs can be set as JSON objects.

Attributes#

NameTypeRequiredDefaultValid valuesDescription
hoststringTrueIP address or the hostname of the Syslog server.
portintegerTrueTarget port of the Syslog server.
namestringFalse"sys logger"Identifier for the server. If you use Prometheus to monitor APISIX metrics, the name is exported in apisix_batch_process_entries.
timeoutintegerFalse3000[1, ...]Timeout in ms for the upstream to send data.
tlsbooleanFalsefalseWhen set to true performs TLS verification.
flush_limitintegerFalse4096[1, ...]Maximum size of the buffer (KB) and the current message before it is flushed and written to the server.
drop_limitintegerFalse1048576Maximum size of the buffer (KB) and the current message before the current message is dropped because of the size limit.
sock_typestringFalse"tcp"["tcp", "udp]Transport layer protocol to use.
pool_sizeintegerFalse5[5, ...]Keep-alive pool size used by sock:keepalive.
log_formatobjectFalseLog 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_bodybooleanFalsefalse[false, true]When set to true includes the request body in the log.
include_req_body_exprarrayFalseFilter for when the include_req_body attribute is set to true. Request body is only logged when the expression set here evaluates to true. See lua-resty-expr for more.
include_resp_bodybooleanFalsefalse[false, true]When set to true includes the response body in the log.
include_resp_body_exprarrayFalseWhen the include_resp_body attribute is set to true, use this to filter based on lua-resty-expr. If present, only logs the response if the expression evaluates to true.

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.

meta_format example#

"<46>1 2024-01-06T02:30:59.145Z 127.0.0.1 apisix 82324 - - {\"response\":{\"status\":200,\"size\":141,\"headers\":{\"content-type\":\"text/plain\",\"server\":\"APISIX/3.7.0\",\"transfer-encoding\":\"chunked\",\"connection\":\"close\"}},\"route_id\":\"1\",\"server\":{\"hostname\":\"baiyundeMacBook-Pro.local\",\"version\":\"3.7.0\"},\"request\":{\"uri\":\"/opentracing\",\"url\":\"http://127.0.0.1:1984/opentracing\",\"querystring\":{},\"method\":\"GET\",\"size\":155,\"headers\":{\"content-type\":\"application/x-www-form-urlencoded\",\"host\":\"127.0.0.1:1984\",\"user-agent\":\"lua-resty-http/0.16.1 (Lua) ngx_lua/10025\"}},\"upstream\":\"127.0.0.1:1982\",\"apisix_latency\":100.99999809265,\"service_id\":\"\",\"upstream_latency\":1,\"start_time\":1704508259044,\"client_ip\":\"127.0.0.1\",\"latency\":101.99999809265}\n"

Metadata#

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

NameTypeRequiredDefaultDescription
log_formatobjectFalseLog 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 $.
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"}

Enable 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

Delete Plugin#

To remove 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
}
}
}'