bruksnys/ansible-config

EXPERIMENTAL - trying out ansible for server setup and perhaps app deployment

EXPERIMENTAL - not the default yet

Ansible configuration management for OpenUp

Setting up your controller (probably your work laptop)

ansible-galaxy install dokku_bot.ansible_dokku

Set up a new dokku server

After creating the server,

1. Add the hostname to the hosts
2. Run the server setup playbook against just the new server:

ansible-playbook --limit dokku9.code4sa.org --inventory hosts -u ubuntu dokku-server.yml

Familiarising yourself with Ansible

Ping all the machines

Not in the network ping command sense, just an ansible command that checks that you can connect to them all

In this repo, run

ansible all -i hosts -m ping -u ubuntu

The result should look something like the following for all hosts:

dokku5.code4sa.org | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python"
    },
    "changed": false,
    "ping": "pong"
}
dokku6.code4sa.org | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python"
    },
    "changed": false,
    "ping": "pong"
}
...

Run an arbitrary command on just the dokkus

Run the following, note we're using dokkus referring to the group in hosts, and not all this time.

ansible dokkus -i hosts -u ubuntu -a "echo hello"

The output should look something like

dokku5.code4sa.org | CHANGED | rc=0 >>
hello

dokku8.code4sa.org | CHANGED | rc=0 >>
hello

dokku7.code4sa.org | CHANGED | rc=0 >>
hello

dokku4.code4sa.org | CHANGED | rc=0 >>
hello

dokku6.code4sa.org | CHANGED | rc=0 >>
hello

Checking what a playbook would do using --check

Run with --check

ansible-playbook --limit dokku9.code4sa.org --inventory hosts -u ubuntu --check dokku-server.yml

Note how it says skipped around each step

PLAY [dokkus] ******************************************************************

TASK [Gathering Facts] *********************************************************
The authenticity of host 'dokku9.code4sa.org (18.200.13.154)' can't be established.
ECDSA key fingerprint is SHA256:Dgs79LzpwVgd/q+vlXqsnlOfZTpEGHUBekNCyruTBh8.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
ok: [dokku9.code4sa.org]

TASK [Set the timezone for the server to be UTC] *******************************
skipping: [dokku9.code4sa.org]

TASK [Set up a unique hostname] ************************************************
changed: [dokku9.code4sa.org]

PLAY RECAP *********************************************************************
dokku9.code4sa.org         : ok=2    changed=1    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0