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Troubleshooting

Diagnosing problems in NATS JetStream clusters requires:

The following tips and commands (while not an exhaustive list) can be useful when diagnosing problems in NATS JetStream clusters:

Troubleshooting tips

  1. Look at nats-server logs. By default, only warning and error logs are produced, but debug and trace logs can be turned on from the command line using -D and -DV, respectively. Alternatively, enabling debug or trace in the server config.
  2. Make sure that in the NATS JetStream configuration, at least one system user is configured in this section: { $SYS { users } }.

nats account commands

Command Description
nats account info Verify that JetStream is enabled on account

Basic nats server commands

Command Description
nats server ls List known servers
nats server ping Ping all servers
nats server info Show information about a single server
nats server check Health check for NATS servers

nats server report commands

Command Description
nats server report connections Report on connections
nats server report accounts Report on account activity
nats server report jetstream Report on JetStream activity

nats server request commands

Command Description
nats server request jetstream Show JetStream details
nats server request subscriptions Show subscription information
nats server request variables Show runtime variables
nats server request connections Show connection details
nats server request routes Show route details
nats server request gateways Show gateway details
nats server request leafnodes Show leafnode details
nats server request accounts Show account details

nats server cluster commands

Command Description
nats server cluster step-down Force a new leader election by standing down the current meta leader
nats server cluster peer-remove Removes a server from a JetStream cluster

Experimental commands

Command Description
nats traffic Monitor NATS traffic. (Experimental command)

Further troubleshooting references