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Update docs

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Link docs to README, update README with recent info.
Update comparsions, add kubeadm vs kargo.
Better describe variables precedence UX impact.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
This commit is contained in:
Bogdan Dobrelya
2017-01-05 14:52:51 +01:00
parent a4dbee3e38
commit e9518072a8
3 changed files with 98 additions and 34 deletions
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39
docs/ansible.md
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@@ -45,9 +45,38 @@ kube-master
etcd
```
Group vars
--------------
The main variables to change are located in the directory ```inventory/group_vars/all.yml```.
Group vars and overriding variables precedence
----------------------------------------------
The group variables to control main deployment options are located in the directory
```inventory/group_vars```.
There are also role vars for docker, rkt, kubernetes preinstall and master roles.
According to the [ansible docs](http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable),
those cannot be overriden from the group vars. In order to override, one should use
the `-e ` runtime flags (most simple way) or other layers described in the docs.
Kargo uses only a few layers to override things (or expect them to
be overriden for roles):
Layer | Comment
------|--------
**role defaults** | provides best UX to override things for Kargo deployments
inventory vars | Unused
**inventory group_vars** | Expects users to use ``all.yml``,``k8s-cluster.yml`` etc. to override things
inventory host_vars | Unused
playbook group_vars | Unuses
playbook host_vars | Unused
**host facts** | Kargo overrides for internal roles' logic, like state flags
play vars | Unused
play vars_prompt | Unused
play vars_files | Unused
registered vars | Unused
set_facts | Kargo overrides those, for some places
**role and include vars** | Provides bad UX to override things! Use extra vars to enforce
block vars (only for tasks in block) | Kargo overrides for internal roles' logic
task vars (only for the task) | Unused for roles, but only for helper scripts
**extra vars** (always win precedence) | override with ``ansible-playbook -e @foo.yml``
Ansible tags
------------
@@ -132,5 +161,5 @@ bastion host.
bastion ansible_ssh_host=x.x.x.x
```
For more information about Ansible and bastion hosts, read
[Running Ansible Through an SSH Bastion Host](http://blog.scottlowe.org/2015/12/24/running-ansible-through-ssh-bastion-host/)
For more information about Ansible and bastion hosts, read
[Running Ansible Through an SSH Bastion Host](http://blog.scottlowe.org/2015/12/24/running-ansible-through-ssh-bastion-host/)