The Fundamentals of Kubernetes Deployment
Infrastructure as Code
It is always considered the best practice to use Infrastructure as Code as the Desired State Configuration, and this has a lot of benefits such as a stable environment and reduced risk while applying changes. We can test the changes in a non-production environment by specifying them as code in the infrastructure. It discourages or prevents manual deployments, making your infrastructure deployments more consistent, reliable, and repeatable. Tools like Terraform and Pulumi can be used to deploy Kubernetes in any cloud platform, where networking, load balancers, or DNS configuration can be done easily in the cluster.
Monitoring & Centralized Logging
Being a stable platform, Kubernetes solves many problems while deploying clusters, which developers might overlook. However, it has proper monitoring solutions that notify users about certificate expiry or over-usage of nodes. Kubernetes platform and applications can be monitored easily using Prometheus and Grafana. This also helps in setting up the alerting system so that downtime or failures can be prevented easily. Logging can be collected using Fluentd or Filebeat, and the logging information can be sent to an ElasticSearch platform to centralize all error logs or log events.
Developers need not spend much time managing all these tools as they are set up centrally in the platform.
Centralized Ingress Controller with SSL Certificate Management
Ingress is a simple configuration that describes how traffic should flow from outside of Kubernetes to your application. This can be achieved by installing a central Ingress Controller (e.g., Nginx) in the cluster to manage all incoming traffic for every application. When an Ingress Controller is linked to a public Cloud LoadBalancer, all traffic is automatically load-balanced among nodes and sent to the right pod IP addresses.
Centralization helps an Ingress Controller to investigate HTTPS and SSL. Kubernetes has a cert-manager that is centrally deployed to manage HTTPS certificates. It can be configured using Let's Encrypt, wildcard certificates, or even a private Certification Authority for internal company-trusted certificates. All incoming traffic will be automatically encrypted using the HTTPS certificates and forwarded to the correct Kubernetes pods.
Role-Based Access Control (RBAC)
Kubernetes Administrator roles should be handled carefully, and hence least privilege should be given to all users while accessing Kubernetes. This can be done easily with the help of Role-Based Access Control (RBAC).
Control for the complete Kubernetes stack (Kubernetes API, deployment tools, dashboards, etc.) can be centrally managed using OAuth2/OIDC for Kubernetes integration with an IAM solution like Keycloak, Azure AD, or AWS Cognito. RBAC helps define access for users based on their role and can also be applied to access groups.
GitOps Deployments
Kubectl is an important command-line tool in Kubernetes, but we cannot manually use the "kubectl apply" command in production. We can use Git to do Kubernetes deployment, but the desired state configuration should be present in Git along with a deployment platform. ArgoCD, Flux, and Jenkins are popular GitOps platforms for Kubernetes deployments. These platforms work well for all types of Kubernetes deployments and immediately roll back changes if they are not in the desired format.
Environments, teams, projects, roles, policies, namespaces, clusters, app groups, and applications are easily managed with a GitOps bootstrapping technique. All changes are traceable, automated, and manageable with GitOps.
Secret Management
User credentials are stored as secrets, and Kubernetes secrets are used to inject them into your containers as environment variables or file mappings. RBAC is applied to access secrets in the production environment, keeping the nature of secrets secure. CI/CD deployment can be used to inject secrets into Kubernetes. Local development environments can also be used, but this may lead to configuration state drift, and secrets cannot be easily managed or traced. Secrets can be synced using cloud central vaults such as Azure Key Vault, HashiCorp Vault, or AWS Secrets Manager with a central secrets operator like External Secrets Operator. Secret references can be stored in Git, pointing to an entry in an external secrets Vault, allowing developers to reference secrets in containers without directly accessing them.
Conclusion
If you have a good Infrastructure as Code (IaC) solution with proper monitoring, RBAC access, and deployment in place, Kubernetes is the go-to solution for any type of orchestration. Setting up a Kubernetes cluster based on standardized open-source tools can save both time and effort.
