How to Safely Stop Logstash?
To stop a Logstash instance safely without causing issues, follow these instructions.
If you're on a systemd-based system, you can stop Logstash using the following command:
systemctl stop logstash
Alternatively, if you started Logstash directly without systemd, like this:
sudo -u logstash /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/logstash.conf
You can safely stop Logstash by sending it a SIGTERM signal:
kill -TERM <logstash_pid>
Alternatively, if Logstash is running in the foreground of your terminal, stopping it is as simple as pressing Ctrl + C.
Logstash will cease all operations across input, filter, and output plugins after shutdown. Before shutting down the application, it ensures all events currently being processed are fully handled.
If Logstash does not shut down as expected and you need to force it to terminate, you can start Logstash with the -pipeline.unsafe_shutdown flag. However, this approach should be used with caution, as it could lead to potential data loss.
To further protect against data loss, especially in situations where you might have to force shutdown, implementing persistent queues in your Logstash setup is advisable.
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