参考文献: Kubernetesマイクロサービス開発の実践 (早川博 著)
https://kubernetes.io/ja/docs/tasks/configure-pod-container/configure-pod-configmap/
kubectl explain configmap
kubectl api-resources
-- 1. ConfigMap作成
cat <<-'EOF' > cm01.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: cm01
namespace: default
data:
key01: val01
key02: val02
file1.conf: |
key11: val11
key12: val12
EOF
kubectl apply -f cm01.yaml
kubectl get cm
kubectl delete -f cm01.yaml
-- 2. Pod作成(コンテナの環境変数に設定する場合)
cat <<-'EOF' > po01.yaml
apiVersion: v1
kind: Pod
metadata:
name: po01
labels:
app: busybox
spec:
containers:
- name: busybox
image: registry.k8s.io/busybox
command:
- "/bin/sh"
- "-c"
args:
- |
echo KEY1=$KEY1
echo KEY2=$(KEY2)_SUFFIX2
env:
- name: KEY1
valueFrom:
configMapKeyRef:
name: cm01
key: key01
- name: KEY2
valueFrom:
configMapKeyRef:
name: cm01
key: key02
EOF
kubectl apply -f po01.yaml
kubectl logs po01
kubectl delete -f po01.yaml
-- 3. Pod作成(読み取り専用ボリュームにファイルを追加する場合)
cat <<-'EOF' > po02.yaml
apiVersion: v1
kind: Pod
metadata:
name: po02
labels:
app: busybox
spec:
containers:
- name: busybox
image: registry.k8s.io/busybox
command:
- "/bin/sh"
- "-c"
args:
- |
cat /etc/config/hoge/fuga/file1.conf
volumeMounts:
- name: cm01vol01
mountPath: /etc/config/
volumes:
- name: cm01vol01
configMap:
name: cm01
items:
- key: file1.conf
path: ./hoge/fuga/file1.conf
EOF
kubectl apply -f po02.yaml
kubectl logs po02
kubectl delete -f po02.yaml
