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kubernetes中api资源由特定的规范进行定义，api资源由组，版本和类型三部分组成，简称gvk。一个gvk确定一种对象类型，对该类型由对应的结构对其进行定义。kubernetes中对象的存储和传输可以使用protobuf，yaml和json三种序列化形式。
pod
pod是kubernetes中最小可部署单元。pod由一组container构成，包括业务容器，init容器，还有一个特殊的pause容器。
下面是一个简单的pod定义。
apiVersion: v1
kind: Pod
metadata:
name: webserver
labels:
app: webserver
spec:
containers:
- name: webserver
image: nginx:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
# hostPort: 8080
# hostIP: "169.169.1.1"
name: http
protocol: TCP
initContainers:
- name: init-dir
image: busybox:latest
workingDir: /tmp
command:
- /bin/sh
- -c
args:
- "mkdir -p test"
env:
- name: MY_ENV
value: "123456"
- name: ANOTHER_ENV
valueFrom:
configMapKeyRef:
name: test-cm
key: CM_ENV
optional: true
# fieldRef:
# fieldPath: metadata.name
# secretKeyRef
resources:
requests:
cpu: "200m"
memory: 1024Mi
limits:
cpu: "500m"
memory: 2048Mi
# nodeSelector:
# diskType: ssd
# nodeName: 192.168.3.31
restartPolicy: OnFailure
hostname: mytest概念：https://kubernetes.io/zh/docs/concepts/workloads/pods/
参考：https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/pod-v1/#PodSpec
service
apiVersion: v1
kind: Service
metadata:
name: webserver
spec:
selector:
app: webserver
ports:
- port: 18080
targetPort: 80
protocol: TCP
name: http-nginx
appProtocol: http
# nodePort: 32119
type: LoadBalancer
# clusterIP: None
# externalIPs:
# - 192.168.2.1
# externalName: www.baidu.com
publishNotReadyAddresses: false概念：https://kubernetes.io/zh/docs/concepts/services-networking/service/
参考：https://kubernetes.io/docs/reference/kubernetes-api/service-resources/service-v1/
configmap
apiVersion: v1
kind: ConfigMap
metadata:
name: webserver-config
data:
default.conf: |
server {
location / {
return 301 $scheme://www.baidu.com.com$request_uri;
}
}
immutable: true概念：https://kubernetes.io/docs/concepts/configuration/configmap/
参考：https://kubernetes.io/docs/reference/kubernetes-api/config-and-storage-resources/config-map-v1/
secret
概念：https://kubernetes.io/zh/docs/concepts/configuration/secret/
参考：https://kubernetes.io/docs/reference/kubernetes-api/config-and-storage-resources/secret-v1/
volume
apiVersion: v1
kind: Pod
metadata:
name: webserver
labels:
app: webserver
spec:
containers:
- name: webserver
image: nginx:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
name: http
protocol: TCP
volumeMounts:
- name: config-vol
mountPath: /etc/nginx/conf.d
volumes:
- name: config-vol
configMap:
name: webserver-config
items:
- key: default.conf
path: default.conf
# - name: foo
# secret:
# secretName: mysecret
# items:
# - key: username
# path: my-group/my-username
# - name: cache-volume
# emptyDir: {}
# - name: hostpath-volume
# hostPath:
# # 宿主上目录位置
# path: /data
# # 此字段为可选
# type: Directory
# - name: mypd
# persistentVolumeClaim:
# claimName: myclaim概念：https://kubernetes.io/zh/docs/concepts/storage/volumes/
pv/pvc/sc
apiVersion: v1
kind: PersistentVolume
metadata:
name: test-pv
spec:
capacity:
storage: 1Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: manual-class
mountOptions:
- hard
- nfsvers=4.1
nfs:
path: /data/nfs/test
server: 192.168.3.27
# persistentvolumeclaim
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: webserver-nfs-pvc
spec:
storageClassName: managed-nfs-storage
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: managed-nfs-storage
provisioner: cluster.local/nfs-subdir-external-provisioner
reclaimPolicy: Delete
volumeBindingMode: Immediate概念：https://kubernetes.io/zh/docs/concepts/storage/persistent-volumes/
参考：
https://kubernetes.io/docs/concepts/storage/storage-classes/