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Gaucho

Gaucho is simply some Python scripts to access the Rancher's API to perform tasks which I need to have executed through my deployment workflow.

At this point, it does not contain much but it might grow as I get more requirements.

Contributions are welcome if you want to use it and add to it.

Usage

Gaucho can be run directly on a command line provided you have Python installed as well as the dependencies listed below.

It can also be run as a Docker container:

docker run --rm -it etlweather/gaucho query 1s245

Rancher Host, Access Key and Secret

Gaucho needs to know the Rancher host and must be given an access key and access secret to be able to interact with the Rancher's API. This can be done through environment variables:

  • CATTLE_ACCESS_KEY
  • CATTLE_SECRET_KEY
  • CATTLE_URL

Rancher Agent Container

If you run Gaucho in a container on Rancher, rather than set the environment variables manually, use the following labels to have Rancher automatically do it for you.

io.rancher.container.create_agent=true
io.rancher.container.agent.role=environment

See Service Accounts in Rancher for more information on this feature.

Supported API

query

Usage: ./services.py query [<service_id>]

Retrieves the service information.

    If you don't specify an ID, data for all services will be retrieved.

Options:

   --service_id  The ID of the service to read (optional)

id_of

Retrieves the ID of a service given its name.

 $ ./services.py cassandra
1s130
 $

start_containers

Usage: ./gaucho start_containers <service_id>

Starts the containers of a given service, typically a Start Once service.

Required Arguments:

  service_id   The ID of the service to start the containers of.

upgrade

Usage: ./services.py upgrade <service_id> [<start_first>] [<complete_previous>] [<imageUuid>] [<auto_complete>] [<batch_size>] [<interval_millis>] [<replace_env_name>] [<replace_env_value>]

Upgrades a service

    Performs a service upgrade, keeping the same configuration, but
    otherwise pulling new image as needed and starting new containers,
    dropping the old ones.

Required Arguments:

  service_id   The ID of the service to upgrade.

Options:

   --start_first        Whether or not to start the new instance first before
                        stopping the old one.
   --complete_previous  If set and the service was previously upgraded but the
                        upgrade wasn't completed, it will be first marked as
                        Finished and then the upgrade will occur.
   --imageUuid          If set the config will be overwritten to use new
                        image. Don't forget Rancher Formatting
                        'docker:<Imagename>:tag'
   --auto_complete      Set this to automatically 'finish upgrade' once
                        upgrade is complete
   --batch_size
   --interval_millis
   --replace_env_name   The name of an environment variable to be changed in
                        the launch config (requires replace_env_value).
   --replace_env_value  The value of the environment variable to be replaced
                        (requires replace_env_name).
   --timeout            How many seconds to wait until an upgrade fails

execute command

Usage: ./gaucho execute <service_id> <command>

Runs the given *command* on the first container found for the given *service id*.

Required Arguments:

  service_id   The ID of the service to perform the command on.
  command      shell command to execute

Dependencies

  • requests
  • baker
  • websocket-client