StatefulSet：
1、稳点且唯一的网络标识符
2、稳点且持久的存储
3、有序、平滑的部署和扩展
4、有序、平滑的删除和终止
5、有序的滚动更新
三个组件组成：headless（无头服务） service、StatefuSet、voluneClaimTemplate（存储卷申请模板）
##需要建好pv存储
apiVersion: v1
kind: Service
metadata:
name: myapp-svc
spec:
ports:
- port: 80
name: web
clusterIP: None
selector:
app: myapp
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: my-statefulset
spec:
serviceName: myapp-svc
replicas: 1
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: mystat-pod
image: ikubernetes/myapp:v1
ports:
- containerPort: 80
name: web
volumeMounts:
- name: myappdata
mountPath: /usr/share/nginx/html
volumeClaimTemplates: ##会动态创建pvc
- metadata:
name: myappdata
spec:
accessModes: ["ReadWriteOnce"]
# storageClassName: "gluster-dybanic"
resources:
requests:
storage: 2Gi
[root@k8s-m ~]# kubectl apply -f srtateful-demo.yaml
service/myapp-svc created
statefulset.apps/my-statefulset created
##查看
[root@k8s-m ~]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv01 2Gi RWO,RWX Retain Bound default/myappdata-my-statefulset-0 2d
pv02 5Gi RWO,RWX Retain Available 2d
pv03 10Gi RWO,RWX Retain Bound default/mypvc 2d
pv04 20Gi RWO,RWX Retain Available 2d
[root@k8s-m ~]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
myappdata-my-statefulset-0 Bound pv01 2Gi RWO,RWX 3m
mypvc Bound pv03 10Gi RWO,RWX 2d
[root@k8s-m ~]# kubectl get sts
NAME DESIRED CURRENT AGE
my-statefulset 1 1 3m
##删除pod的话，pvc不会被删除
#上面粘贴的格式有误
构建pv与StatefulSet
#创建目录
mkdir /data/{v1,v2,v3,v4,v5} -p
#安装nfs
yum install -y nfs-utils
#更改所有者
chown -R nfsnobody.nfsnobody /data/
#配置nfs文件
[root@k8s-m yaml]# cat /etc/exports
/data/v1 172.31.0.0/20(rw,sync)
/data/v2 172.31.0.0/20(rw,sync)
/data/v3 172.31.0.0/20(rw,sync)
/data/v4 172.31.0.0/20(rw,sync)
/data/v5 172.31.0.0/20(rw,sync)
#启动nfs
systemctl start nfs
#查看挂载资源
[root@k8s-m yaml]# showmount -e 127.0.0.1
Export list for 127.0.0.1:
/data/v5 172.31.0.0/20
/data/v4 172.31.0.0/20
/data/v3 172.31.0.0/20
/data/v2 172.31.0.0/20
/data/v1 172.31.0.0/20 #创建pv
[root@k8s-m yaml]# cat mypv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv01
spec:
nfs:
path: /data/v1
server: k8s-m
accessModes: ["ReadWriteMany","ReadWriteOnce"]
capacity:
storage: 2Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv02
spec:
nfs:
path: /data/v2
server: k8s-m
accessModes: ["ReadWriteMany"]
capacity:
storage: 2Gi #导入
kubectl apply -f mypv.yaml
#创建statefulset
[root@k8s-m yaml]# cat mystatefulset.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx
labels:
app: nginx
spec:
ports:
- port: 80
name: web
clusterIP: None
selector:
app: nginx
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
name: web
spec:
serviceName: "nginx"
replicas: 1
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:alpine
ports:
- containerPort: 80
name: web
volumeMounts:
- name: www
mountPath: /usr/share/nginx/html
volumeClaimTemplates:
- metadata:
name: www
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 2Gi #导入
kubectl apply -f mystatefulset.yaml
#查看
[root@k8s-m yaml]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
www-web-0 Bound pv01 2Gi RWO,RWX 5s
[root@k8s-m yaml]# kubectl get statefulset
NAME READY AGE
web 1/1 20s
[root@k8s-m yaml]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myapp-deploy-59fddd9797-6px2d 1/1 Running 0 117m
myapp-deploy-59fddd9797-scvdl 1/1 Running 0 117m
myapp-deploy-59fddd9797-zrk95 1/1 Running 0 117m
web-0 1/1 Running 0 24s