Log Collection Troubleshooting Guide
There are a number of common issues that can get in the way when sending new logs to Datadog via the log collector in the
dd-agent. If you experience issues sending new logs to Datadog, this list helps you troubleshoot. If you continue to have trouble, contact Datadog support for further assistance.
Restart the Agent
Changes in the configuration of the
datadog-agent won’t be taken into account until you have restarted the Agent.
Outbound traffic on port 10516 is blocked
The Datadog Agent sends its logs to Datadog over tcp via port 10516. If that connection is not available, logs fail to be sent and an error is recorded in the
agent.log file to that effect.
Test manually your connection by running a telnet or openssl command like so (port 10514 would work too, but is less secure):
openssl s_client -connect intake.logs.datadoghq.com:10516
telnet intake.logs.datadoghq.com 10514
And then by sending a log like the following:
<API_KEY> this is a test message
- If opening the port 10514 or 10516 is not an option, it is possible to configure the Datadog Agent to send logs through HTTPS by adding the following in
See the HTTPS log forwarding section for more information.
Check the status of the Agent
Often, checking the Agent status command results will help you troubleshoot what is happening.
No new logs have been written
The Datadog Agent only collects logs that have been written after it has started trying to collect them (whether it be tailing or listening for them). In order to confirm whether log collection has been successfully set up, make sure that new logs have been written.
Permission issues tailing log files
datadog-agent does not run as root (and we do not recommend that you make it run as root, as a general best-practice). For this reason, when you configure your
datadog-agent to tail log files (for custom logs or for integrations) you need to take special care to ensure the
datadog-agent user has read access to tail the log files you want to collect from.
In that case, you should see an error message when checking the Agent status:
Status: Error: file /var/log/application/error.log does not exist
namei command to obtain more information about the file permissions:
> namei -m /var/log/application/error.log
> f: /var/log/application/error.log
In this example, the
application directory is not executable, therefore the Agent cannot list its files. Furthermore, the Agent does not have read permissions on the
Add the missing permissions via the chmod command.
Note: When adding the appropriate read permissions, make sure that these permissions are correctly set in your log rotation configuration. Otherwise, on the next log rotate, the Datadog Agent may lose its read permissions.
Set permissions as
644 in the log rotation configuration to make sure the Agent has read access to the files.
Permission issue and Journald
When collecting logs from Journald, make sure that the Datadog Agent user is added in the systemd group as shown in the Journald integration.
Note: Journald sends an empty payload if the file permissions are incorrect. Accordingly, it is not possible to raise or send an explicit error message in this case.
These are a few of the common configuration issues that are worth triple-checking in your
Check if the
api_key is defined in
Check if you have
logs_enabled: true in your
By default the Agent does not collect any logs, make sure there is at least one .yaml file in the Agent’s
conf.d/ directory that includes a logs section and the appropriate values.
You may have some .yaml parsing errors in your configuration files. YAML can be finicky, so when in doubt rely on a YAML validator.
Check for errors in the Agent logs
There might be an error in the logs that would explain the issue. Run the following command to check for errors:
sudo cat /var/log/datadog/agent.log | grep ERROR
See the Docker Log Collection Troubleshooting Guide
See the Lambda Log Collection Troubleshooting Guide
Unexpectedly dropping logs
Check if logs appear in the Datadog Live Tail. If they appear in the Live Tail, check the Indexes configuration page for any exclusion filters that could match your logs.
Additional helpful documentation, links, and articles: