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Task manager / scheduler Kubernetes integration

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2019-07-03 12:09:17 -04:00
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# Container Groups
In a traditional AWX installation, jobs (ansible-playbook runs) are executed
either directly on a member of the cluster or on a pre-provisioned "isolated"
node.
The concept of a Container Group (working name) allows for job environments to
be provisioned on-demand as a Pod that exists only for the duration of the
playbook run. This is known as the ephemeral execution model and ensures a clean
environment for every job run.
## Configuration
A `ContainerGroup` is simply an `InstanceGroup` that has an associated Credential
that allows for connecting to an OpenShift or Kubernetes cluster.
To create a new type, add a new `ManagedCredentialType` to
`awx/main/models/credential/__init__.py` where `kind='kubernetes'`.
### Create Credential
A `Credential` must be created where the associated `CredentialType` is one of:
- `kubernetes_bearer_token`
Other credential types (such as username/password) may be added in the future.
### Create a Container Groupp
Once this `Credential` has been associated with an `InstanceGroup`, the
`InstanceGroup.kubernetes` property will return `True`.
#### Pod Customization
There will be a very simple default pod spec that lives in code.
A custom YAML document may be provided. This will allow the UI to implement
whatever fields necessary, because any custom fields (think 'image' or
'namespace') can be "serialized" as valid `Pod` JSON or YAML. A full list of
options can be found in the Kubernetes documentation
[here](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.15/#pod-v1-core).
```bash
cat > api_request.json <<EOF
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"namespace": "my-namespace"
},
"spec": {
"containers": [
{
"args": [
"sleep",
"infinity"
],
"image": "my-custom-image",
"stdin": true,
"tty": true
}
]
}
}
EOF
curl -Lk --user 'admin:password' \
-X PATCH \
-d @api_request.json \
-H 'Content-Type: application/json' \
https://localhost:8043/api/v2/instance_groups/2/
```

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#
# Create service account / role / role-binding:
# oc -n my-namespace apply -f service-account.yml
#
# Obtain API token and CA cert:
#
# $ SECRET_NAME=$(oc -n my-namespace get sa awx -o json | jq -r '.secrets[0].name')
# $ oc -n my-namespace get secret $SECRET_NAME -o json | jq -r '.data["token"] | @base64d'
# $ oc -n my-namespace get secret $SECRET_NAME -o json | jq -r '.data["ca.crt"] | @base64d'
#
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: awx
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: pod-manager
rules:
- apiGroups: [""] # "" indicates the core API group
resources: ["pods"]
verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
- apiGroups: [""]
resources: ["pods/exec"]
verbs: ["create"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: awx-pod-manager
subjects:
- kind: ServiceAccount
name: awx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: pod-manager

28
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Dictdiffer is free software; you can redistribute it and/or modify it
under the terms of the MIT License quoted below.
Copyright (C) 2013 Fatih Erikli.
Copyright (C) 2013, 2014 CERN.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
In applying this license, CERN does not waive the privileges and
immunities granted to it by virtue of its status as an
Intergovernmental Organization or submit itself to any jurisdiction.

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PARTICULAR PURPOSE. You are solely responsible for determining the
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of your accepting any such warranty or additional liability.
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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
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Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Apache License
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http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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"License" shall mean the terms and conditions for use, reproduction,
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The MIT License (MIT)
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The MIT License (MIT)
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