Kubernetes ConfigMaps

A ConfigMap is an API object used to store non-confidential data in key-value pairs. Pods can consume ConfigMaps as environment variables, command-line arguments, or as configuration files in a volume. https://kubernetes.io/docs/concepts/configuration/configmap/

Commands

• kubectl create configmap

kubectl create configmap <map-name> <data-source>

• kubectl get configmaps
• kubectl describe configmaps YOUR_CONFIG_MAP_NAME
• kubectl edit configmap

EKS

• kubectl edit -n kube-system configmap/aws-auth
• kubectl describe -n kube-system configmap/aws-auth

helm list
Error: configmaps is forbidden: User "system:serviceaccount:kube-system:default" cannot list resource "configmaps" in API group "" in the namespace "kube-system"

Activities

• CKA v1.23: Use ConfigMaps and Secrets to configure applications
• CKA v1.15, CKA v1.21: Understand ConfigMaps

News

• Aug 2020 Kubernetes v1.19 Immutable Secrets and ConfigMaps

Related terms

• Deployment, Service, Secrets
• Terraform: kubernetes_config_map https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs/resources/config_map (ConfigMap)
• kind: ConfigMap
• Terraform resource: kubernetes_config_map
• Sidecar container
• aws-auth configmap
• Kustomize
• configMapRef:
• data:
• Error: kind ConfigMap
• Error: UPGRADE FAILED: kind ConfigMap with the name "you-configmap-name" in "your-env" already exists
• Already exists in the cluster

See also

• AWS IAM Authenticator for Kubernetes: aws-auth, kubectl edit -n kube-system configmap/aws-auth, eksctl create iamidentitymapping, mapUsers:, mapRoles:, mapAccounts:
• ConfigMaps: kubectl [ get | edit | describe | create | delete ] configmaps, aws-auth, Kustomize, kind: ConfigMap, ConfigMapRef, envFrom
• Kubectl information commands: cluster-info | view | pods | nodes | services | version | describe | logs

https://github.com/kubernetes/enhancements/issues/1412