Configuration file

Creating configuration file

Semaphore uses a config.json file for its core configuration. You can generate this file interactively using built-in tools or through a web-based configurator.

Generate via CLI

Use the following commands to generate the configuration file interactively:

• For the Semaphore server:

  semaphore setup

• For the Semaphore runner:

  semaphore runner setup
  팁

  For more details about runner configuration, see the Runners section.

Generate on the website

Alternatively, you can use the web-based interactive configurator:

• Server configurator
• Runner configurator

Configuration file example

Semaphore uses a config.json configuration file with following content:

{
	"mysql_test": {
		"host": "127.0.0.1:3306",
		"user": "root",
		"pass": "***",
		"name": "semaphore"
	},

	"dialect": "mysql",

	"git_client": "go_git",
	"git_attempts": 4,

	"auth": {
		"totp": {
			"enabled": false,
			"allow_recovery": true
		}
	},

	"use_remote_runner": true,
	"runner_registration_token": "73fs***",

 	"tmp_path": "/tmp/semaphore",
 	"cookie_hash": "96Nt***",
 	"cookie_encryption": "x0bs***",
 	"access_key_encryption": "j1ia***",

	"max_tasks_per_template": 3,

	"schedule": {
		"timezone": "UTC"
	},

	"log": {
		"events": {
			"enabled": true,
			"path": "./events.log"
		}
	},

	"process": {
		"chroot": "/opt/semaphore/sandbox"
	}
 }

Configuration file usage

• For Semaphore server:

semaphore server --config ./config.json

• For Semaphore runner:

semaphore runner start --config ./config.json

Secrets directory

Semaphore stores short-lived secret files (for example HashiCorp Vault or OpenBao tokens read from disk) under a configurable directory.

Option	Environment variable	Description
dirs.secrets	SEMAPHORE_SECRETS_PATH	Directory for secret files. Default: /tmp/semaphore.
secrets_path (legacy)	SEMAPHORE_SECRETS_PATH	Top-level setting kept for backward compatibility. Used only when dirs.secrets is unset or still at the default path.

Precedence: a non-default dirs.secrets wins over the legacy secrets_path. When you set SEMAPHORE_SECRETS_PATH, Semaphore applies it to both fields.

Example using the current layout:

{
  "dirs": {
    "secrets": "/var/lib/semaphore/secrets"
  }
}

Legacy installations may still use:

{
  "secrets_path": "/var/lib/semaphore/secrets"
}

Token files referenced by external secret storages must live inside this directory.

Git operations

Semaphore clones and updates task repositories before each run. Two options control this behavior:

Option	Environment variable	Description
git_client	SEMAPHORE_GIT_CLIENT	Git client implementation: cmd_git (default, uses the system git binary) or go_git (pure Go client).
git_attempts	SEMAPHORE_GIT_ATTEMPTS	Number of times clone and pull operations are tried before the task fails. Default: 4. Set to 1 to try once with no retries.

When a clone or pull fails and retries remain, Semaphore waits with exponential backoff (starting at 1 second, doubling each attempt, capped at 60 seconds) and logs a message such as Git pull failed (...), retrying in 2s. Retries apply only to network operations; a failed checkout or authentication error still fails the task after all attempts are exhausted.

If your git server is intermittently unavailable, increase git_attempts. If failures are immediate and persistent (wrong credentials, missing repository), fix the underlying issue — retries will not help.