Node logs

Where a node writes its log, in which format and how to read it.

Read a node's log and send it to your logging system. The log records starts, Group 0 changes and errors.

Requirements

Access to the node's machine or to its standard error.

Where it goes

Without --logpath, the log goes to standard error. With --logpath, to that file; with --logappend, it writes at the end of the file and keeps what it already held.

As JSON

Shell

teseladb start --dbpath /var/lib/teseladb --log-format json --logpath /var/log/teseladb/node.log

With --log-format json, each event is a JSON line, easier to send to a logging system.

From mongosh

JavaScript

db.adminCommand({ getLog: "global" });

Check

At start, the log records the ready line with the identifier of the node and of the cluster.

Common problems

The log never shows the root password, or any other; only the path of the credentials file.