Bolt supports multiple log levels. You can configure the log level from the CLI, or in a project configuration file. Supported logging levels, in order from most to least information logged, are trace, debug, info, warn, error, and fatal.

By default, Bolt logs a debug-level log to a bolt-debug.log file in the root of your project directory. You can also configure custom logs from your project configuration file.

The bolt-debug.log file

Each time you run a Bolt command, Bolt prints a debug-level log to a bolt-debug.log file in the root of your project directory.

You can disable the log file by specifying the following in your bolt-project.yaml file:

  bolt-debug.log: disable

Setting log level

You can set Bolt's log level from the CLI or use a configuration file.

Setting log level on the CLI

To set the log level from the CLI, use the log-level option along with the desired level. Available log levels are trace, debug, info, warn, error, and fatal. For example:

  • *nix shell command

    bolt command run whoami -t target1 --log-level trace
  • PowerShell cmdlet

    Invoke-BoltCommand -Command whoami -Targets target1 -LogLevel trace

Setting log level in a configuration file

To set the log level for the console, add a log map with a console mapping to your project configuration file.

Use the level key to set the log level. For example:

# bolt-project.yaml
name: lotsalogs

    level: debug

If you want to write a log to a file, add a map with the file destination to the log mapping. For example, the following bolt-project.yaml file writes info and trace level logs to a logs directory in the Bolt project:

# bolt-project.yaml
name: lotsalogs

    append: false
    level: trace
    append: false
    level: info

Set the append key to false if you want to overwrite the file on each run, or true if you want to append to the existing file.

Note: The directory you set for logging must exist, and Bolt must have permission to write to it.

Log levels


Trace logs contain the most detailed information for actions run on individual targets. For example, the logs include each command run on a target, each step of compiling a puppet code file (manifest) for an apply block, and information about establishing connections with targets.

Trace logs are useful when you're trying to troubleshoot a problem with Bolt. They contain information about what exactly Bolt is doing when it runs an action on each target.


Debug logs contain information for target-specific steps and detailed information about where Bolt is loading data from. For example, debug logs include information on how Bolt locates the project to load, where different content is loaded from, and information about actions run on each individual target.

Debug logs are useful for troubleshooting a problem with a plan or the way you're using Bolt. You can use debug logs for a high-level understanding of what actions Bolt is running on individual targets, or to find out where Bolt is loading data from.


Info logs give you a high-level overview of what Bolt is doing. For example, an info log contains information about which Bolt project is loaded, when different actions run on targets start and finish, and results from actions run on targets.

Info logs are useful when you want to see the results for an action in a Bolt execution. They're also useful for a high-level understanding of what Bolt is doing.


Warn logs contain warnings about deprecations and potentially harmful situations that might affect your Bolt run, even though they don't prevent Bolt from executing. For example, Bolt warns you if your inventory file includes an unsupported transport configuration that might result in Bolt connecting to targets in a way that you don’t expect.

Bolt prints warnings to the console by default.

Use a warn log if you're trying to find out if you're using Bolt in a way that might result in unexpected behavior, or to see if you're using a deprecated feature.


Error logs contain messages for errors that Bolt encountered during execution. For example, Bolt prints an error if a PuppetDB query fails.

Bolt prints errors to the console by default.

Use an error log if you want to see errors that Bolt raised during a Bolt run.


Fatal logs contain emerg and critical messages from a Puppet code file (manifest) or apply block.

Use a fatal error log if you want to see fatal errors raised by issues in your Puppet code.

Using verbose output

Verbose output is useful when you want to see the results for Bolt actions on your targets that are usually not printed to standard out (stdout). Verbose isn't a log level, but is a way of telling Bolt to output additional information in a human-readable format.

The following Bolt commands include the --verbose CLI option:

  • bolt command run

  • bolt task run

  • bolt plan run

  • bolt script run

  • bolt file upload

  • bolt file download

  • bolt apply

The following PowerShell cmdlets include the -Verbose argument:

  • Invoke-BoltCommand

  • Invoke-BoltTask

  • Invoke-BoltPlan

  • Invoke-BoltScript

  • Send-BoltFile

  • Receive-BoltFile

  • Invoke-BoltApply

Verbose output is particularly useful for debugging your tasks and plans. If you're not sure why something is failing, try running it with --verbose to get more information. You can also use out::verbose in plans to print messages to stdout in verbose mode. For example, to print "Hello world" to stdout in verbose mode:

plan mymodule::myplan {
 out::verbose('Hello world')

Suppress warnings

You can suppress warning messages from being logged by Bolt. To disable specific warnings, add a list of warning IDs to the disable-warnings configuration option in bolt-project.yaml or bolt-defaults.yaml. If defined in both files, the lists of warnings are concatenated per the configuration merge strategy. For example, if Bolt issues the following warning:

The configuration option 'apples' is deprecated. Use 'oranges' instead. [ID: fruit_option]

You could add the ID fruit_option under the disable-warnings configuration option:

# bolt-project.yaml
name: myproject
  - fruit_option

The next time you run Bolt, the warning message will not be logged.

📖 Related information