OpenShift + GitOps + Argo CD

1. OpenShift + GitOps + Argo CD
Rastin Kenarsari

2. GitOps
Argo CD
Rastin Kenarsari

3. GitOps
What is GitOps?
GitOps is an operational framework that takes DevOps best practices
used for application development such as
• Version control
• Collaboration
• Compliance
• CI/CD tooling
and applies them to infrastructure automation.
GitOps is used to automate the process of provisioning infrastructure
Rastin Kenarsari

4. GitOps
GitOps = IaC + MRs + CI/CD
Rastin Kenarsari

5. GitOps
IaC : Infrastructure as code
(IaC)
IaC: GitOps uses a Git repository as the single
source of truth for infrastructure definitions
Rastin Kenarsari

6. GitOps
MRs: Merge Requests (MRs)
GitOps uses MRs as the change mechanism
for all infrastructure updates.
Rastin Kenarsari

7. GitOps
CI/CD: : Continuous Integration
and Continuous Delivery
GitOps automates infrastructure updates using a Git
workflow with continuous integration and continuous
delivery (CI/CD).
Rastin Kenarsari

8. GitOps
CI/CD: : Continuous Integration
and Continuous Delivery
GitOps automates infrastructure updates using a Git
workflow with continuous integration and continuous
delivery (CI/CD).
Rastin Kenarsari

9. ACM
GitOps Challenge
GitOps allows
for
greater Collabora
tion
Not necessarily
comes naturally for
some individuals
or organizations
A GitOps approval process (“Change by committee” )
Developers make
changes to the
code
Create a merge
request,
Approver merges
these changes
It seem tedious
and time-
consuming to
engineers used to
making quick,
manual changes.

10. ACM
Less “cowboy
engineering” B
Better GitOps
Rastin Kenarsari

11. GitOps
Rastin Kenarsari

12. ArgoCD
ArgoCD
Rastin Kenarsari

13. ArgoCD
• Uses structural models that describe
the desired application structure and
state, which are interpreted by a
deployment engine to enforce this state
Declarative
Deployment
• Uses procedural models that explicitly
specify a process to be executed
Imparative
Deployment
Rastin Kenarsari

14. ArgoCD
Argo CD is a declarative, GitOps continuous delivery tool
for Kubernetes.
It extends the benefits of declarative specifications and
Git-based configuration management to
• Accelerate deployment
• Lifecycle management of applications
Rastin Kenarsari

15. ArgoCD
ArgoCD
Custom Resource
Definition (CRD)
Rastin Kenarsari

16. ArgoCD
• Agent is on Cluster
• Pulls Desired Application Spec
• Security
• Confidence of Deployment
• Higher Observability
Pull
Model
• Agent Outside of Cluster
• Push Desired Application Sped to
• Security
• Confidence of Deployment
• Higher Observability
Push
Model
Rastin Kenarsari

17. ArgoCD
Git
(Single
Source of
Truth)
Git
(Desired
States)
Argo CD
Monitors
Git
Argo CD
Detect
Changes in
Git
Argo CD
pulls (Pull
Model)
desired state
from Git
Argo CD
Deploy
Actual State
on Cluster
Rastin Kenarsari