Troubleshooting
Let’s learn to troubleshoot a swarm service using its logs.
We'll cover the following
docker service logs
Swarm Service logs can be viewed with the docker service logs
command. However, not all logging drivers support the command.
By default, Docker nodes configure services to use the json-file
log driver, but other drivers exist, including:
journald
(only works on Linux hosts runningsystemd
)syslog
splunk
gelf
json-file
and journald
are the easiest to configure, and both work with the docker service logs
command. The format of the command is docker service logs <service-name>
.
If you’re using 3rd-party logging drivers you should view those logs using the logging platform’s native tools.
The following snippet from a daemon.json
configuration file shows a Docker host configured to use syslog
.
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