Improve Servers

[alajmo]

This is an issue to improve the server object. I've gathered the following use-cases:

• [x] allow duplicate hosts https://github.com/alajmo/sake/pull/25
• [x] resolve hostnames from ssh_config https://github.com/alajmo/sake/issues/12
• [x] Support Bastion/Jumphost https://github.com/alajmo/sake/pull/32
• [ ] Define multiple hosts without creating individual servers
• [ ] Dynamically fetch hosts (via kubectl, reading from a text file or any other way)
• [ ] Regex filtering of servers

Notes

• How to target inventory? (%, number of servers, regex?)

Some initial mockup of the new design:

• Expand env variables in inventory
• Inventory example: for i in $(seq 1 100); do echo www.$i.example.com; done

    # sake run -s server-1 --number 1 # --number 25%
    servers:
      # One of the following:
      # host: 192.168.1.1
      # hosts: www[01:50].example.com # look at https://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html#adding-ranges-of-hosts
      # hosts:
      # - 192.168.1.1
      # - 192.168.1.2
      inventory: kubectl get nodes # or cat hosts.txt # add example for k8s

[alesauce]

Hello! I’d like to contribute to this project, but I don’t want to duplicate anything that you’re actively working on. Is there anything on this issue that I can pick up, or should I find another one?

[alajmo]

I think the regex filtering of servers task would be a good start (code paths for similar functionality exist, see tags/servers).

Some notes:

• Set via flag or config, I'm thinking the name --match could be used
• Target server hosts (so it's not regex for the server names, but for the server hosts)
• Write some unit tests

[josegonzalez]

Would be great to be able to pass arguments to whatever gets inventory. Something like:

    # sake run -s server-1 -inventory-args "--expanded-args here"
    servers:
      # One of the following:
      # host: 192.168.1.1
      # hosts: www[01:50].example.com # look at https://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html#adding-ranges-of-hosts
      # hosts:
      # - 192.168.1.1
      # - 192.168.1.2
      inventory: some-command

So the inventory command would be:

some-command --expanded-args here

[alajmo]

Not sure I follow, do you mean something like this:

    servers:
        name: server-1
            inventory: echo $SOME_ENV

$ sake run ping -s server-1 SOME_ENV="192.168.1.1,192.168.1.2"

which would run task ping on servers:

• 192.168.1.1
• 192.168.1.2

[josegonzalez]

I think I would pair this with another tool, like a python script, that generates the servers to connect to. But I would like to modify what that python tool generates (maybe select a different region or env) based on some runtime arguments that sake would pass to the script. Not sure what the interface might look like.

[alajmo]

All features are released with v0.12.0 now. @josegonzalez you can now run the following:

    servers:
        inv:
            inventory: ./some-python-script $somearg
            env:
              somearg: 192.168.1.2 

# use default somearg 192.168.1.2
sake run <task> -s inv

# Pass CLI argument
sake run <task> -s inv somearg=192.168.1.99