Configuration Management for the Cloud Native world with GitOps and Helm - Tomasz Tarczyński

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Traditional DevOps wisdom is to utilize automation tools for configuring all the systems, so all pieces of configuration should be described with code stored in version control. Then the people responsible for these systems can use standard Dev practices to collaborate on this code (reviews, tests, quality gates, etc.). With the advent of cloud native systems, we now utilize containers and orchestrators to define how our applications should be operated. Kubernetes provides a declarative API, so you can describe the desired state of the system. And then it is the role of the control plane to operate the cluster (make the actual state match the desired state). But we still need config mgmt for API objects to the point when they are applied to the cluster. Helm helps organizing these configs into charts, template them, and manage releases. And GitOps lets you use a git repo as a single source of truth for the desired state of the whole system. Then all changes to this state are delivered as git commits instead of using kubectl apply or helm upgrade. In this talk I will introduce the GitOps model for operating cloud native environments and give a short demo.

Technology

Conﬁg management for
Kubernetes: GitOps + Helm
Tomasz Tarczyński, Gigaset

Agenda
@ttarczynski
1. Conﬁguration Management
2. Why GitOps
3. Demo: Flux
4. Demo: Helm
5. Demo: Flux Helm Operator

Conﬁguration Management
@ttarczynski
● Infrastructure as a Code
● GIT – as a single source of truth
● Tools:
Ansible / Chef / Puppet / Salt

Puppet
@ttarczynski
● DSL: a simple and constrained language
● Declarative: describe the desired state
● Templates: ERB
● Modules: public and private

Kubernetes
@ttarczynski
● Control plane provides a Declarative API
● Declare the desired state
● Control plane makes sure that the actual
state converges to the desired state

Kubernetes: Why GitOps
@ttarczynski
● Can we declare all the state in GIT?
And expect the system to converge.
● Can we have something like modules?

Kubernetes: Why GitOps
@ttarczynski
● Conﬁguration Management:
Imperative vs Declarative

GitOps: How
@ttarczynski
Kubernetes
API
push
container images
kubectl apply
pull

GitOps: How
@ttarczynski
● Flux CD: a GitOps operator
○ Runs in the cluster
○ Synchronizes the cluster state with a GIT repo
○ CNCF sandbox project

GitOps: How
@ttarczynski
Kubernetes
API
Flux CD
push
container images
commit
kubectl apply
sync
pull
images metadata
apply / delete

GitOps
@ttarczynski
Demo
https://github.com/ttarczynski/gitops-demo

GitOps: Why Helm
@ttarczynski
● We declared all the state in GIT
● But can we have something like modules?

GitOps: Why Helm
@ttarczynski
● Helm: The package manager for Kubernetes
○ ﬁnd, share, and use software built for Kubernetes

GitOps: Why Helm
@ttarczynski
● Manage complexity: describe complex apps

GitOps: Why Helm
@ttarczynski
● Manage complexity: describe complex apps
● Easy updates: in-place upgrades and custom hooks

GitOps: Why Helm
@ttarczynski
● Manage complexity: describe complex apps
● Easy updates: in-place upgrades and custom hooks
● Simple sharing: public / private repo

Helm
@ttarczynski
Demo
https://github.com/ttarczynski/gitops-demo

GitOps + Helm
@ttarczynski
● Flux Helm Operator:
○ automates Helm Chart releases
○ Kubernetes Custom Resource named HelmRelease
○ charts are released as speciﬁed in HelmRelease

GitOps + Helm
@ttarczynski
Demo
https://github.com/ttarczynski/gitops-demo

GitOps
@ttarczynski
● The entire system is described declaratively
● The canonical desired system state is
versioned (with Git)
● Approved changes to the desired state are
automatically applied to the system
● Software agents ensure correctness

GitOps: Flux docs
@ttarczynski
● ﬂuxcd.io
● docs.ﬂuxcd.io
● github.com/ﬂuxcd/helm-operator-get-started
● github.com/ttarczynski/gitops-demo

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Configuration Management for the Cloud Native world with GitOps and Helm - Tomasz Tarczyński

1. Conﬁg management for Kubernetes: GitOps + Helm Tomasz Tarczyński, Gigaset

2. Agenda @ttarczynski 1. Conﬁguration Management 2. Why GitOps 3. Demo: Flux 4. Demo: Helm 5. Demo: Flux Helm Operator

3. Conﬁguration Management @ttarczynski ● Infrastructure as a Code ● GIT – as a single source of truth ● Tools: Ansible / Chef / Puppet / Salt

4. Puppet @ttarczynski ● DSL: a simple and constrained language ● Declarative: describe the desired state ● Templates: ERB ● Modules: public and private

5. Kubernetes @ttarczynski ● Control plane provides a Declarative API ● Declare the desired state ● Control plane makes sure that the actual state converges to the desired state

6. Kubernetes: Why GitOps @ttarczynski ● Can we declare all the state in GIT? And expect the system to converge. ● Can we have something like modules?

7. Kubernetes: Why GitOps @ttarczynski ● Conﬁguration Management: Imperative vs Declarative

8. GitOps: How @ttarczynski Kubernetes API push container images kubectl apply pull

9. GitOps: How @ttarczynski ● Flux CD: a GitOps operator ○ Runs in the cluster ○ Synchronizes the cluster state with a GIT repo ○ CNCF sandbox project

10. GitOps: How @ttarczynski Kubernetes API push container images kubectl apply pull

11. GitOps: How @ttarczynski Kubernetes API Flux CD push container images commit kubectl apply sync pull images metadata apply / delete

12. GitOps @ttarczynski Demo https://github.com/ttarczynski/gitops-demo

13. GitOps: Why Helm @ttarczynski ● We declared all the state in GIT ● But can we have something like modules?

14. GitOps: Why Helm @ttarczynski ● Helm: The package manager for Kubernetes ○ ﬁnd, share, and use software built for Kubernetes

15. GitOps: Why Helm @ttarczynski ● Manage complexity: describe complex apps

16. GitOps: Why Helm @ttarczynski ● Manage complexity: describe complex apps ● Easy updates: in-place upgrades and custom hooks

17. GitOps: Why Helm @ttarczynski ● Manage complexity: describe complex apps ● Easy updates: in-place upgrades and custom hooks ● Simple sharing: public / private repo

18. GitOps: Why Helm @ttarczynski ● Manage complexity: describe complex apps ● Easy updates: in-place upgrades and custom hooks ● Simple sharing: public / private repo ● Rollbacks: roll back to an older version with ease

19. Helm @ttarczynski Demo https://github.com/ttarczynski/gitops-demo

20. GitOps + Helm @ttarczynski ● Flux Helm Operator: ○ automates Helm Chart releases ○ Kubernetes Custom Resource named HelmRelease ○ charts are released as speciﬁed in HelmRelease

21. Credit: https://ﬂuxcd.io GitOps + Helm

22. GitOps + Helm @ttarczynski Demo https://github.com/ttarczynski/gitops-demo

23. GitOps @ttarczynski ● The entire system is described declaratively ● The canonical desired system state is versioned (with Git) ● Approved changes to the desired state are automatically applied to the system ● Software agents ensure correctness

24. Agenda @ttarczynski 1. Conﬁguration Management 2. Why GitOps 3. Demo: Flux 4. Demo: Helm 5. Demo: Flux Helm Operator

25. GitOps: Flux docs @ttarczynski ● fluxcd.io ● docs.fluxcd.io ● github.com/fluxcd/helm-operator-get-started ● github.com/ttarczynski/gitops-demo

26. Thanks! Tomasz Tarczynski @ttarczynski

Configuration Management for the Cloud Native world with GitOps and Helm - Tomasz Tarczyński

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