[英]How to mount a configMap as a volume mount in a Stateful Set
根据https://kube.netes.io/docs/reference/generated/kube.netes-api/v1.17/#statefulset-v1- ,我没有看到将 configMap 作为卷挂载到 statefulset 中的选项apps only PVC 可以与“StatefulSet”相关联。 但是 PVC 没有 configMaps 选项。
这是一个最小的例子:
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: example
spec:
selector:
matchLabels:
app: example
serviceName: example
template:
metadata:
labels:
app: example
spec:
containers:
- name: example
image: nginx:stable-alpine
volumeMounts:
- mountPath: /config
name: example-config
volumes:
- name: example-config
configMap:
name: example-configmap
---
apiVersion: v1
kind: ConfigMap
metadata:
name: example-configmap
data:
a: "1"
b: "2"
在容器中,您可以在/config
下找到文件a
和b
,内容分别为1
和2
。
一些解释:您不需要 PVC 来将 configmap 作为卷挂载到您的 pod。 PersistentVolumeClaim
是永久性驱动器,您可以从中读取/写入。 它们的使用示例是数据库,例如 Postgres。
另一方面, ConfigMap
是存储在 Kubernetes 内部(在其 etcd 存储中)的只读键值结构,用于存储应用程序的配置。 它们的值可以单独或全部挂载为环境变量或文件。
我已经这样做了。
apiVersion: v1
kind: ConfigMap
metadata:
name: rabbitmq-configmap
namespace: default
data:
enabled_plugins: |
[rabbitmq_management,rabbitmq_shovel,rabbitmq_shovel_management].
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: rabbitmq
labels:
component: rabbitmq
spec:
serviceName: "rabbitmq"
replicas: 1
selector:
matchLabels:
component: rabbitmq
template:
metadata:
labels:
component: rabbitmq
spec:
initContainers:
- name: "rabbitmq-config"
image: busybox:1.32.0
volumeMounts:
- name: rabbitmq-config
mountPath: /tmp/rabbitmq
- name: rabbitmq-config-rw
mountPath: /etc/rabbitmq
command:
- sh
- -c
- cp /tmp/rabbitmq/rabbitmq.conf /etc/rabbitmq/rabbitmq.conf && echo '' >> /etc/rabbitmq/rabbitmq.conf;
cp /tmp/rabbitmq/enabled_plugins /etc/rabbitmq/enabled_plugins
volumes:
- name: rabbitmq-config
configMap:
name: rabbitmq-configmap
optional: false
items:
- key: enabled_plugins
path: "enabled_plugins"
- name: rabbitmq-config-rw
emptyDir: {}
containers:
- name: rabbitmq
image: rabbitmq:3.8.5-management
env:
- name: RABBITMQ_DEFAULT_USER
value: "username"
- name: RABBITMQ_DEFAULT_PASS
value: "password"
- name: RABBITMQ_DEFAULT_VHOST
value: "vhost"
ports:
- containerPort: 15672
name: ui
- containerPort: 5672
name: api
volumeMounts:
- name: rabbitmq-data-pvc
mountPath: /var/lib/rabbitmq/mnesia
volumeClaimTemplates:
- metadata:
name: rabbitmq-data-pvc
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 2Gi
---
apiVersion: v1
kind: Service
metadata:
name: rabbitmq
spec:
selector:
component: rabbitmq
ports:
- protocol: TCP
port: 15672
targetPort: 15672
name: ui
- protocol: TCP
port: 5672
targetPort: 5672
name: api
type: ClusterIP
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