INDEX

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2024-01-04 17:30
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Devops Toolkit... Helmfile
https://www.youtube.com/watch?v=qIJt8Iq8Zb0

Working with Helm at small scale is fine - meant to be used to build packages
Helmfile is used to define the full environment of a release
	# helmfile-prometheus.yaml
	repositories:
	- name: prometheus
	  url: ... # Prometheus github helm-charts url
	releases:
	- name: prometheus
	  namespace: prometheus
	  chart: prometheus/prometheus

	helmfile --file helmfile-prometheus.yaml apply --wait # Deploys this release

What if you want to set a couple more arguments?
	# (extending) helmfile-prometheus-rbac.yaml
	... # Extension of helmfile-prometheus.yaml
	releases:
	- name: prometheus
	  ...
	  set:
	    - name: rbac.create
	      value: false

	helmfile --interactive --file helmfile-prometheus-rbac.yaml apply --wait # Calculates diff
	# --interactive lets you manually choose whether to apply changes

	helmfile --interactive --file helmfile-prometheus-rbac.yaml destroy # Also queries changes

Now look at writing larger, multi-service scripts
	# helmfile-multi.yaml
	repositories:
	- name: prometheus
	  url: ... # As before
	releases:
	- name: prometheus # Main release
	  namspace: prometheus
	  chart: prometheus/prometheus
	  set:
	  - name: rbac.create
	    value: false
	- name: devops-toolkit # Alt release
	  namespace: production
	  chart: devops-toolkit
	  set:
	  - name: image.tag
	    value: "2.9.10"
	  - name: ingress.host
	    value: devops-toolkit.{{ requiredEnv "BASE_HOST" }}
	- name: devops-paradox
	  namespace: production # Alt release 2
	  chart: devops-paradox
	  set:
	  - name: image.tag
	    value: "1.71"
	    value: {{ env "DEVOPS_PARADOX_HOST" | default "devops-paradox.acme.com" }}

	helmfile --file helmfile-multi.yaml apply --wait # Gives error due to required env variable
	export BASE_HOST=localhost
	helmfile --file helmfile-multi.yaml --interactive apply --wait # Shows diff

	kubectl --namespace production get ingresses # Shows multiple releases exist

Can use templates to remove repeated code
	# helmfile.yaml (Same as helmfile-multi.yaml but extended)
	... # Repository info
	templates:
	  default: &default
	    namespace: production
	    chart: "{{`{{ .Release.Name }}`}}"
	    missingFileHandler: Warn
	releases:
	...
	- name: devops-toolkit
	  <<: *default # Whatever is in the "default" template is injected
	  ...
	- name: devops-paradox
	  <<: *default
	  ...

	helmfile --interactive apply --wait # Uses known files to apply
	helmfile destroy # Deletes everything