K8s references: Configmaps

April 02, 2022

Created by Ranjith Vijayan on Apr 02, 2022

This post is created for my own reference of k8s resources as part of learning

Configmap based on yaml declaration

• Create yaml file e.g.

apiVersion: v1
kind: ConfigMap
metadata:
  name: filebeat-yaml-config
  namespace: fcubs
data:
  filebeat.yml: |-
    filebeat.inputs:
    - type: log
      enabled: true
      paths:
        - /opt/logs/**
      multiline.pattern: '^[0-9]{4}-[0-9]{2}-[0-9]{2}'
      multiline.negate: true
      multiline.match: after
  
    output.logstash:
      hosts: ["${LOGSTASH_HOST}:${LOGSTASH_PORT}"]
 
---

• create resource using yaml

    kubectl create -f cfg-map.yaml
  

• Configmaps can be created from file using –from-file argument. Multiple files in a directory can be supplied to configmap by supplying the directory name. This is useful for binary files.

• In the below example the there are 2 files in “property” folder, and we can create configmap using this command

  kubectl create configmap prop-keystore --from-file=property -n fcubs
  

• To view the configmap. Please note in k8s dashboard the binary data won’t be displayed. Use below command to view the binary data (in base64 format)

kubectl get cm prop-keystore -n fcubs -o json