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how_to_use_machines.rst

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Use remote machines

The term machine in cpk is used to indicate an endpoint, that is reachable over the internet and on which we want to build and run our projects.

It is convenient to let cpk handle our machines, so that we don't have to insert passwords or type in long and hard to remember hostnames or IP addresses.

For example, we are working on a new project and we want to be able to test it on a workstation in our office while we are working from home, maybe using a not too powerful laptop. In this case, we would register our workstation as a cpk machine and then tell cpk to build and run our project there instead of our laptop.

Machines are managed using the command cpk machine.

Create a Machine

Using the example above, we assume that our workstation is reachable at the IP address 10.0.0.1. We have two ways of connecting to our workstation, TCP or SSH.

Create an SSH Machine (recommended)

We assume that our workstation is configured to accept SSH connections and that we have an account with username myuser on our workstation.

We create a cpk machine called myws using the command,

$ cpk machine create myws myuser@10.0.0.1

Connections based on SSH are made using 2048 bit RSA keypairs that cpk creates and exchanges with the destination machine. For cpk to install the key on the destination, we will be prompted to insert the user password.

Note

The SSH password is only needed to transfer the keys, it is not stored and/or used by cpk for anything else.

Once the keys are transferred, we are ready to use the new machine.

Create a TCP Machine (unsecure, not recommended)

Warning

TCP connections are not encrypted and require that the destination exposes the Docker endpoint to the network. This is very dangerous and only suggested within a private local network.

We create a cpk machine called myws using the command,

$ cpk machine create myws 10.0.0.1

List Machines

We can list the machines stored by cpk by running the command,

$ cpk machine list

A shortcut for the command above is cpk machine ls.

Remove a Machine

We can remove a machine called myws using the command,

$ cpk machine remove myws

A shortcut for the command above is cpk machine rm.

Use a Machine

You can think of cpk as having a default machine that gets created when you install it, pointing to your local Docker endpoint.

Once your machine is created, you can redirect all your cpk commands towards it, instead of the default (local) machine. In order to do so, pass the argument -H/--machine <MACHINE> to your cpk commands.

Note

The value of <MACHINE> can be: - The name of a machine you previously created (e.g., myws); - A (resolvable) hostname of a machine exposing the TCP socket for Docker; - An IP address of a machine exposing the TCP socket for Docker;

For example, we can show information about the endpoint a machine points to with the command,

$ cpk endpoint info -H myws

This will show you information about the Docker endpoint the machine myws is pointing to, for example,

cpk|    INFO : CPK - Code Packaging toolKit - v0.0.4
cpk|    INFO : Retrieving info about Docker endpoint...
   |
   | Docker Endpoint:
   |   Machine: myws
   |   Hostname: myws
   |   Operating System: Ubuntu 20.04.2 LTS
   |   Kernel Version: 5.4.0-74-generic
   |   OSType: linux
   |   Architecture: x86_64
   |   Total Memory: 251.64 GB
   |   CPUs: 64
   |

You can build and run your cpk projects against a machine, with cpk build -H myws and cpk run -H myws.