Automating Kubernetes Environments with Ansible
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Ansible fits naturally into any Kubernetes environment. Both are very active and widely used open source projects with vibrant communities that help make hard things easier. Here, we explore ways how...
![[k8s-us-east4-test:vars]
cache_service_name: cache-service-test
cache_service_namespace: myapp
cache_service_memcached_pool_size: 3
cache_service_pool_setup: sharded
k8s_cluster_config: /path/to/gke-beta-config
[k8s-us-west1-prod:vars]
cache_service_name: cache-service-prod
cache_service_namespace: myapp
cache_service_memcached_pool_size: 9
cache_service_pool_setup: sharded
k8s_cluster_config: /path/to/gke-prod-config
apiVersion: mcrouter.example.com/v1alpha3
kind: Mcrouter
metadata:
name: {{ cache_service_name }}
namespace: {{ cache_service_namespace }}
spec:
memcached_pool_size: >
{{ cache_service_memcached_pool_size }}
- name: define cache service resource
k8s:
kubeconfig: "{{ k8s_cluster_config | default(omit) }}"
definition: "{{ lookup('template', >
'k8s-cache-service-def.yaml.j2') | from_yaml }}"](https://image.slidesharecdn.com/automatingkubernetesenvironmentswithansibledestinationautomation-200716201153/85/Automating-Kubernetes-Environments-with-Ansible-11-320.jpg)
![[k8s] Kubernetes terminology (1).pdf](https://cdn.slidesharecdn.com/ss_thumbnails/k8skubernetesterminology1-230513211357-e2d31a79-thumbnail.jpg?width=560&fit=bounds)
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Automating Kubernetes Environments with Ansible
- 3. ● ● ● ●
- 4. apiVersion: v1 kind: ConfigMap metadata: name: foo namespace: default data: color: red - name: create foo configmap k8s: definition: apiVersion: v1 kind: ConfigMap metadata: name: foo namespace: default data: color: “{{ color }}”
- 5. --- - name: create foo configmap k8s: definition: "{{ lookup('template', '/foo.yml') | from_yaml }}"
- 8. $ kubectl create -f deploy/crds/cache.example.com_memcacheds_crd.yaml $ kubectl create -f deploy/service_account.yaml $ kubectl create -f deploy/role.yaml $ kubectl create -f deploy/role_binding.yaml $ kubectl create -f deploy/operator.yaml # we are skipping over the instructions to run sed commands or make # manual edits to these files here.
- 11. [k8s-us-east4-test:vars] cache_service_name: cache-service-test cache_service_namespace: myapp cache_service_memcached_pool_size: 3 cache_service_pool_setup: sharded k8s_cluster_config: /path/to/gke-beta-config [k8s-us-west1-prod:vars] cache_service_name: cache-service-prod cache_service_namespace: myapp cache_service_memcached_pool_size: 9 cache_service_pool_setup: sharded k8s_cluster_config: /path/to/gke-prod-config apiVersion: mcrouter.example.com/v1alpha3 kind: Mcrouter metadata: name: {{ cache_service_name }} namespace: {{ cache_service_namespace }} spec: memcached_pool_size: > {{ cache_service_memcached_pool_size }} - name: define cache service resource k8s: kubeconfig: "{{ k8s_cluster_config | default(omit) }}" definition: "{{ lookup('template', > 'k8s-cache-service-def.yaml.j2') | from_yaml }}"
- 13. ● Encode human operational knowledge ● Automatically patch, upgrade, recover, and tune container-based apps and services ● Kubernetes-native ● Purpose-built for a specific application or service ● Enable “day 2” management Operators simplify management of complex applications on Kubernetes
- 14. Phase I Phase II Phase III Phase IV Phase V Basic Install Automated application provisioning and configuration management Seamless Upgrades Patch and minor version upgrades supported Full Lifecycle App lifecycle, storage lifecycle (backup, failure recovery) Deep Insights Metrics, alerts, log processing and workload analysis Auto Pilot Horizontal/vertical scaling, auto config tuning, abnormal detection, scheduling tuning
- 16. K8s Operator with Ansible
- 17. your Operator image Ansible Role Ansible Role watches.yaml base Ansible Operator SDK image Operator SDK Binary ansible-runner Ansible Python + Libraries
- 18. ● Initialize Your Operator With Ansible ○ $ operator-sdk new foo-operator --api-version=cache.example.com/v1alpha1 --kind=Foo --type=ansible ● Automate With Ansible ○ Create new roles and playbooks or reuse an existing one ● Define a watches file ○ Map a Kubernetes object to your Ansible content ● Build Your Operator ○ $ operator-sdk build foo-operator:v0.0.1 ● Deploy Your Operator to a Kubernetes Cluster
- 22. GitOps the Ansible Way 23 CI REGISTRY DEV CODE REPO CONFIG REPO R W R W R O “OPS” R W
- 23. Advantages of using Ansible 24 GitOps Beyond Cloud-Native ▸ Supports cloud-native and traditional IT automation ▸ Integrations beyond Kubernetes such as cloud & networking
- 24. Advantages of using Ansible 25 Flexibility To Do More ▸ Flexibility and freedom to choose what you need ▸ Deploy, manage and automate multiple environments thru one control plane. ▸ No dedicated GitOps “agent” required
- 25. ● ● ● ●
- 26. Resources & More 27 ▸ Ansible K8s Modules ･ https://docs.ansible.com/ansible/latest/modules/list_of_clustering_modules.html#k8s ▸ How Useful Is Ansible In A Cloud-Native Kubernetes Environment? ･ https://www.ansible.com/blog/how-useful-is-ansible-in-a-cloud-native-kubernetes-environment ▸ Building Kubernetes Operators in an Ansible-native way (Webinar) ･ https://www.cncf.io/webinars/building-kubernetes-operators-in-an-ansible-native-way/ ▸ Creating Ansible-based Operators ･ https://docs.openshift.com/container-platform/4.5/operators/operator_sdk/osdk-ansible.html ▸ Using Ansible Automation Webhooks for GitOps ･ https://www.redhat.com/sysadmin/ansible-webhooks-gitops ▸ Guide to GitOps ･ https://www.weave.works/technologies/gitops/
- 27. Thank you