Filebeat vs. rsyslog for forwarding logs
Choose between Filebeat and rsyslog by input protocol, destination, parsing needs, restart behavior, and the workload you can actually test.
Choose Filebeat when file collection and Elastic-oriented processing are central to the job. Choose rsyslog when you need a syslog receiver, host logging rules, or forwarding among syslog systems. Both can read files and forward events; the best fit depends on the interfaces you need to operate.
Compare the collection path
| Decision | Filebeat | rsyslog |
|---|---|---|
| File ingestion | filestream tracks files and reading positions in its registry |
imfile reads files and maintains state when configured |
| System and network logs | Supports relevant inputs and processors; choose these for your installed version | Dedicated syslog inputs, local Unix sockets, and journal integration |
| Destinations | Elasticsearch, Logstash, Kafka, Redis, and other documented outputs | Syslog forwarding, files, and modules for destinations such as Kafka or Elasticsearch |
| Parsing | Parsers, processors, modules, and downstream ingest pipelines | RainerScript, templates, and parser/normalization modules |
| Buffering and recovery | Internal queue and output acknowledgment behavior | Main/action queues, optional disk assistance, and module-specific delivery behavior |
| Operating cost | Depends on inputs, parsing, queues, and output load | Depends on the same workload choices; the implementation language alone is not a sizing method |
Filebeat permits one configured output type at a time. If several independent destinations need the same stream, design a fan-out stage such as a broker or downstream processor rather than assuming that several Filebeat output sections will all run.
Choose for the source and destination
For application files or container logs headed into an existing Elastic workflow, Filebeat's file tracking and integration tooling may reduce custom work. Use the current filestream input and verify its file-identity and rotation settings for your version.
For routers, security appliances, or hosts emitting syslog, rsyslog gives you direct protocol and routing controls. TCP, UDP, and RELP are different delivery choices; select compatible modules at both ends and configure TLS where needed.
A mixed deployment can use rsyslog for syslog traffic and Filebeat for application files. Draw the input boundaries explicitly. Reading a file with both collectors, or shipping it once directly and again through a local relay, can create duplicate events.
FAQ
Can rsyslog handle application files and stack traces?
Yes. imfile supports file-state tracking and multiline options. Compare its configuration with Filebeat's parsers using your own rotation pattern and sample stack traces. Convenience is an operational preference, not proof that one tool lacks the feature.
Which is faster?
There is no useful universal events-per-second answer. Compare equivalent message sizes, parsing, encryption, acknowledgment, and queue durability settings. Include destination outages and restarts in the trial: fast ingestion is not sufficient if recovery drops or duplicates data.
References: Filebeat filestream, Filebeat outputs, and rsyslog imfile.
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