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PodPreset
PodPreset用来给指定标签的Pod注入额外的信息，如环境变量、存储卷等。这样，Pod模板就不需要为每个Pod都显式设置重复的信息。
开启PodPreset
开启API settings.k8s.io/v1alpha1/podpreset
开启准入控制 PodPreset
示例
增加环境变量和存储卷的PodPreset
kind: PodPreset
apiVersion: settings.k8s.io/v1alpha1
metadata:
name: allow-database
namespace: myns
spec:
selector:
matchLabels:
role: frontend
env:
- name: DB_PORT
value: "6379"
volumeMounts:
- mountPath: /cache
name: cache-volume
volumes:
- name: cache-volume
emptyDir: {} |
用户提交Pod
apiVersion:
v1
kind: Pod
metadata:
name: website
labels:
app: website
role: frontend
spec:
containers:
- name: website
image: ecorp/website
ports:
- containerPort: 80 |
经过准入控制PodPreset后，Pod会自动增加环境变量和存储卷
apiVersion:
v1
kind: Pod
metadata:
name: website
labels:
app: website
role: frontend
annotations:
podpreset.admission.kubernetes.io/allow-database:
"resource version"
spec:
containers:
- name: website
image: ecorp/website
volumeMounts:
- mountPath: /cache
name: cache-volume
ports:
- containerPort: 80
env:
- name: DB_PORT
value: "6379"
volumes:
- name: cache-volume
emptyDir: {} |
ConfigMap示例
ConfigMap
apiVersion: v1
kind: ConfigMap
metadata:
name: etcd-env-config
data:
number_of_members: "1"
initial_cluster_state: new
initial_cluster_token: DUMMY_ETCD_INITIAL_CLUSTER_TOKEN
discovery_token: DUMMY_ETCD_DISCOVERY_TOKEN
discovery_url: http://etcd_discovery:2379
etcdctl_peers: http://etcd:2379
duplicate_key: FROM_CONFIG_MAP
REPLACE_ME: "a value" |
PodPreset
kind: PodPreset
apiVersion: settings.k8s.io/v1alpha1
metadata:
name: allow-database
namespace: myns
spec:
selector:
matchLabels:
role: frontend
env:
- name: DB_PORT
value: 6379
- name: duplicate_key
value: FROM_ENV
- name: expansion
value: $(REPLACE_ME)
envFrom:
- configMapRef:
name: etcd-env-config
volumeMounts:
- mountPath: /cache
name: cache-volume
- mountPath: /etc/app/config.json
readOnly: true
name: secret-volume
volumes:
- name: cache-volume
emptyDir: {}
- name: secret-volume
secretName: config-details |
用户提交的Pod
apiVersion:
v1
kind: Pod
metadata:
name: website
labels:
app: website
role: frontend
spec:
containers:
- name: website
image: ecorp/website
ports:
- containerPort: 80 |
经过准入控制 PodPreset后，Pod会自动增加ConfigMap环境变量
apiVersion:
v1
kind: Pod
metadata:
name: website
labels:
app: website
role: frontend
annotations:
podpreset.admission.kubernetes.io/allow-database:
"resource version"
spec:
containers:
- name: website
image: ecorp/website
volumeMounts:
- mountPath: /cache
name: cache-volume
- mountPath: /etc/app/config.json
readOnly: true
name: secret-volume
ports:
- containerPort: 80
env:
- name: DB_PORT
value: "6379"
- name: duplicate_key
value: FROM_ENV
- name: expansion
value: $(REPLACE_ME)
envFrom:
- configMapRef:
name: etcd-env-config
volumes:
- name: cache-volume
emptyDir: {}
- name: secret-volume
secretName: config-details |
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1881 次浏览 |
63次 |
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