37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
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# Command-Line Interface (CLI)
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This section is a work in progress.
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The `consul` binary provides a CLI for interacting with the [HTTP API]. Some commands may
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also exec other processes or generate data used by Consul (ex: tls certificates). The
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`agent` command is responsible for starting the Consul agent.
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The [cli reference] in Consul user documentation has a full reference to all available
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commands.
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[HTTP API]: ../http-api
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[cli reference]: https://www.consul.io/commands
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## Code
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The CLI entrypoint is [main.go] and the majority of the source for the CLI is under the
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[command] directory. Each subcommand is a separate package under [command]. The CLI uses
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[github.com/mitchellh/cli] as a framework, and uses the [flag] package from the stdlib for
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command line flags.
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[command]: https://github.com/hashicorp/consul/tree/main/command
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[main.go]: https://github.com/hashicorp/consul/blob/main/main.go
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[flag]: https://pkg.go.dev/flag
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[github.com/mitchellh/cli]: https://github.com/mitchellh/cli
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## Important notes
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The [cli.Ui] wraps an `io.Writer` for both stdout and stderr. At the time of writing both
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`Info` and `Output` go to stdout. Writing `Info` to stdout has been a source of a couple
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bugs. To prevent these bugs in the future it is recommended that `Info` should no longer
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be used. Instead, send all information messages to stderr by using `Warn`.
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[cli.Ui]: https://pkg.go.dev/github.com/mitchellh/cli#Ui
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