The new CLI

The new Mesos Command Line Interface provides one executable Python 3 script to run all default commands and additional custom plugins.

Two of the subcommands available allow you to debug running containers:

• mesos task exec, to run a command in a running task's container.
• mesos task attach, to attach your local terminal to a running task and stream its input/output.

Building the CLI

For now, the Mesos CLI is still under development and not built as part of a standard Mesos distribution.

However, the CLI can be built using Autotools and Cmake options. If necessary, check the options described in the linked pages to set Python 3 before starting a build.

The result of this build will be a mesos binary that can be executed.

Using the CLI

Using the CLI without building Mesos is also possible. To do so, activate the CLI virtual environment by following the steps described below:

$ cd src/python/cli_new/
$ PYTHON=python3 ./bootstrap
$ source activate
$ mesos

Calling mesos will then run the CLI and calling mesos-cli-tests will run the integration tests.

Configuring the CLI

The CLI uses a configuration file to know where the masters of the cluster are as well as list any plugins that should be used in addition to the default ones provided.

The configuation file, located by default at ~/.mesos/config.toml, looks like this:

# The `plugins` array lists the absolute paths of the
# plugins you want to add to the CLI.
plugins = [
  "</absolute/path/to/plugin-1/directory>",
  "</absolute/path/to/plugin-2/directory>"
]

# The `master` field is either composed of an `address` field
# or a `zookeeper` field, but not both. For example:
[master]
  address = "10.10.0.30:5050"
  # The `zookeeper` field has an `addresses` array and a `path` field.
  # [master.zookeeper]
  #   addresses = [
  #     "10.10.0.31:5050",
  #     "10.10.0.32:5050",
  #     "10.10.0.33:5050"
  #   ]
  #   path = "/mesos"