Configuration | Tarantool
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The key artifact that defines the tt environment and various aspects of its execution is its configuration file.

By default, the configuration file is called tt.yaml. The location where tt searches for it depends on the launch mode. You can also pass the configuration file explicitly in the --cfg option.

The tt configuration file is a YAML file with the following content:

    directory: path/to/modules/dir
    instances_enabled: path/to/applications
    run_dir: path/to/run_dir
    log_dir: path/to/log_dir
    bin_dir: path/to/bin_dir
    inc_dir: path/to/inc_dir
    wal_dir: path/to/wal_dir
    vinyl_dir: path/to/vinyl_dir
    memtx_dir: path/to/memtx_dir
    log_maxsize: num (MB)
    log_maxage: num (days)
    log_maxbackups: num
    restart_on_failure: bool
    rocks: path/to/rocks
    distfiles: path/to/install
    credential_path: path/to/file
    - path: path/to/app/templates1
    - path: path/to/app/templates2

  • instances_enabled – the directory where instances are stored.

  • run_dir– the directory for instance runtime artifacts, such as console sockets or PID files. Default: var/run.

  • log_dir – the directory where log files are stored. Default: var/log.

  • bin_dir – the directory where binary files are stored. Default: bin.

  • inc_dir – the base directory for storing header files. They will be placed in the include subdirectory inside the specified directory. Default: include.

  • wal_dir – the directory where write-ahead log (.xlog) files are stored. Default: var/lib.

  • memtx_dir – the directory where memtx stores snapshot (.snap) files. Default: var/lib.

  • vinyl_dir – the directory where vinyl files or subdirectories are stored. Default: var/lib.


    In all directories specified in *_dir parameters, tt creates a directory for each application and instance directories inside it. Names of these directories match the names of applications and instances.

  • log_maxsize – the maximum size of the log file before it gets rotated, in megabytes. Default: 100.

  • log_maxage – the maximum age of log files in days. The age of a log file is defined by the timestamp encoded in its name. Default: not defined (log files aren’t deleted based on their age).


    A day is defined as exactly 24 hours. It may not exactly correspond to calendar days due to daylight savings, leap seconds, and other time adjustments.

  • log_maxbackups – the maximum number of stored log files. Default: not defined (log files aren’t deleted based on their count).

  • restart_on_failure – restart the instance on failure: true or false. Default: false.

  • rocks – the directory where rocks files are stored.
  • distfiles – the directory where installation files are stored.

  • credential_path – a path to the file with credentials used for downloading Tarantool Enterprise Edition.

  • path – a path to application templates used for creating applications with tt create. May be specified more than once.

tt launch mode defines its working directory and the way it searches for the configuration file. There are three launch modes:

  • default
  • system
  • local

Argument: none

Configuration file: searched from the current directory to the root. Taken from /etc/tarantool if the file is not found.

Working directory: The directory where the configuration file is found.

Argument: --system or -S

Configuration file: Taken from /etc/tarantool.

Working directory: Current directory.

Argument: --local=DIRECTORY or -L=DIRECTORY

Configuration file: Searched from the specified directory to the root. Taken from /etc/tarantool if the file is not found.

Working directory: The specified directory. If tarantool or tt executable files are found in the working directory, they will be used.

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