Batch mode and load balancing with HTTP

This section describes how to send messages to multiple URLs with syslog-ng OSE.

Starting with version 3.19, you can specify multiple URLs, for example, url(“site1” “site2”). In this case, syslog-ng OSE sends log messages to the specified URLs in a load-balance fashion. This means that syslog-ng OSE sends each message to only one URL. For example, you can use this to send the messages to a set of ingestion nodes or indexers of your SIEM solution if a single node cannot handle the load. Note that the order of the messages as they arrive on the servers can differ from the order syslog-ng OSE has received them, so use load-balancing only if your server can use the timestamp from the messages. If the server uses the timestamp when it receives the messages, the order of the messages will be incorrect.

CAUTION: If you set multiple URLs in the url() option, set the persist-name() option as well to avoid data loss.

Starting with version syslog-ng OSE version 3.22, you can use any of the following formats to specify multiple URLs:

url("server1", "server2", "server3"); # comma-separated strings
url("server1" "server2" "server3"); # space-separated strings
url("server1 server2 server3"); # space-separated within a single string