目录
一、EndPoints
1、简介
EndPoints:是收录Pod
EndPoints是怎么来的？
创建Service，实际会创建一个同名的Endpoints。
Service只负责提供一个VIP，EndPoints才是提供负载均衡服务的。
1、EndPoints和Service可以通过名称一致关联在一起
# 可以通过EndPoints将外部服务接入集群中
# EndPoints详解
[root@k8s-master-01 k8s]# kubectl explain endpoints
2、创建EndPoints
# 启动mysql镜像
[root@k8s-master-01 k8s]# docker run -d --rm --name mysql -p 33060:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7
kind: Endpoints # 定义资源接口类型
apiVersion: v1 # 指定api接口资源版本
metadata: # 定义资源的元数据信息
name: mysql # 定义资源的名称
subsets: # 定义端口
- addresses: # 定义web服务的ip
- ip: 192.168.11.101
ports:
- port: 33060
---
kind: Service
apiVersion: v1
metadata:
name: mysql
spec:
ports:
- port: 3306
targetPort: 33060
2.1、部署Endpoints
# 部署
[root@k8s-master-01 k8s]# kubectl apply -f mysql1.yaml
endpoints/mysql created
service/mysql created
# 查看
[root@k8s-master-01 k8s]# kubectl get endpoints
NAME ENDPOINTS AGE
mysql 192.168.11.101:33060 33s
2.2、测试
[root@k8s-master-01 k8s]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
mysql ClusterIP 10.99.167.85 <none> 3306/TCP 10m
[root@k8s-master-01 k8s]# kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
mysql mysql-c5549fb5-z69gj 1/1 Running 0 54m
# 进入容器
[root@k8s-master-01 k8s]# kubectl exec -it -n mysql mysql-c5549fb5-z69gj -- bash
# 链接数据库
root@mysql-c5549fb5-z69gj:/# mysql -uroot -p123456 -hmysql.default.svc.cluster.local
二、Ingress
1、简介
k8s 对外暴露服务（service）主要有两种方式：NotePort, LoadBalance， 此外externalIPs也可以使各类service对外提供服务，但是当集群服务很多的时候，NodePort方式最大的缺点是会占用很多集群机器的端口；LB方式最大的缺点则是每个service一个LB又有点浪费和麻烦，并且需要k8s之外的支持； 而ingress则只需要一个NodePort或者一个LB就可以满足所有service对外服务的需求
实际上，ingress相当于一个7层的负载均衡器，是k8s对反向代理的一个抽象.大概的'工作原理也确实类似于Nginx'，可以理解成在 Ingress 里建立一个个映射规则 , ingress Controller 通过监听 Ingress这个api对象里的配置规则并转化成 Nginx 的配置（kubernetes声明式API和控制循环） , 然后对外部提供服务
# 官网：
https://kubernetes.github.io/ingress-nginx/
2、修改Ingress文件
[root@k8s-master-01 k8s]# cat deploy.yaml
apiVersion: v1
apiVersion: v1
kind: Namespace
metadata:
name: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
---
# Source: ingress-nginx/templates/controller-serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx
namespace: ingress-nginx
automountServiceAccountToken: true
---
# Source: ingress-nginx/templates/controller-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller
namespace: ingress-nginx
data:
---
# Source: ingress-nginx/templates/clusterrole.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
name: ingress-nginx
rules:
- apiGroups:
- ''
resources:
- configmaps
- endpoints
- nodes
- pods
- secrets
verbs:
- list
- watch
- apiGroups:
- ''
resources:
- nodes
verbs:
- get
- apiGroups:
- ''
resources:
- services
verbs:
- get
- list
- watch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- ''
resources:
- events
verbs:
- create
- patch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses/status
verbs:
- update
- apiGroups:
- networking.k8s.io # k8s 1.14+
resources:
- ingressclasses
verbs:
- get
- list
- watch
---
# Source: ingress-nginx/templates/clusterrolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
name: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: ingress-nginx
subjects:
- kind: ServiceAccount
name: ingress-nginx
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/controller-role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx
namespace: ingress-nginx
rules:
- apiGroups:
- ''
resources:
- namespaces
verbs:
- get
- apiGroups:
- ''
resources:
- configmaps
- pods
- secrets
- endpoints
verbs:
- get
- list
- watch
- apiGroups:
- ''
resources:
- services
verbs:
- get
- list
- watch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses/status
verbs:
- update
- apiGroups:
- networking.k8s.io # k8s 1.14+
resources:
- ingressclasses
verbs:
- get
- list
- watch
- apiGroups:
- ''
resources:
- configmaps
resourceNames:
- ingress-controller-leader-nginx
verbs:
- get
- update
- apiGroups:
- ''
resources:
- configmaps
verbs:
- create
- apiGroups:
- ''
resources:
- events
verbs:
- create
- patch
---
# Source: ingress-nginx/templates/controller-rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx
namespace: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: ingress-nginx
subjects:
- kind: ServiceAccount
name: ingress-nginx
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/controller-service-webhook.yaml
apiVersion: v1
kind: Service
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller-admission
namespace: ingress-nginx
spec:
type: ClusterIP
ports:
- name: https-webhook
port: 443
targetPort: webhook
selector:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
---
# Source: ingress-nginx/templates/controller-service.yaml
apiVersion: v1
kind: Service
metadata:
annotations:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller
namespace: ingress-nginx
spec:
type: NodePort
ports:
- name: http
port: 80
protocol: TCP
targetPort: http
- name: https
port: 443
protocol: TCP
targetPort: https
selector:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
---
# Source: ingress-nginx/templates/controller-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller
namespace: ingress-nginx
spec:
selector:
matchLabels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
revisionHistoryLimit: 10
minReadySeconds: 0
template:
metadata:
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
spec:
dnsPolicy: ClusterFirst
containers:
- name: controller
image: registry.cn-hangzhou.aliyuncs.com/k8sos/ingress-controller:v0.45.0
imagePullPolicy: IfNotPresent
lifecycle:
preStop:
exec:
command:
- /wait-shutdown
args:
- /nginx-ingress-controller
- --election-id=ingress-controller-leader
- --ingress-class=nginx
- --configmap=$(POD_NAMESPACE)/ingress-nginx-controller
- --validating-webhook=:8443
- --validating-webhook-certificate=/usr/local/certificates/cert
- --validating-webhook-key=/usr/local/certificates/key
securityContext:
capabilities:
drop:
- ALL
add:
- NET_BIND_SERVICE
runAsUser: 101
allowPrivilegeEscalation: true
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: LD_PRELOAD
value: /usr/local/lib/libmimalloc.so
livenessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 1
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 1
successThreshold: 1
failureThreshold: 3
ports:
- name: http
containerPort: 80
protocol: TCP
- name: https
containerPort: 443
protocol: TCP
- name: webhook
containerPort: 8443
protocol: TCP
volumeMounts:
- name: webhook-cert
mountPath: /usr/local/certificates/
readOnly: true
resources:
requests:
cpu: 100m
memory: 90Mi
nodeSelector:
kubernetes.io/os: linux
serviceAccountName: ingress-nginx
terminationGracePeriodSeconds: 300
volumes:
- name: webhook-cert
secret:
secretName: ingress-nginx-admission
---
# Source: ingress-nginx/templates/admission-webhooks/validating-webhook.yaml
# before changing this value, check the required kubernetes version
# https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/#prerequisites
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingWebhookConfiguration
metadata:
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
name: ingress-nginx-admission
webhooks:
- name: validate.nginx.ingress.kubernetes.io
matchPolicy: Equivalent
rules:
- apiGroups:
- networking.k8s.io
apiVersions:
- v1beta1
operations:
- CREATE
- UPDATE
resources:
- ingresses
failurePolicy: Fail
sideEffects: None
admissionReviewVersions:
- v1
- v1beta1
clientConfig:
service:
namespace: ingress-nginx
name: ingress-nginx-controller-admission
path: /networking/v1beta1/ingresses
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/clusterrole.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
rules:
- apiGroups:
- admissionregistration.k8s.io
resources:
- validatingwebhookconfigurations
verbs:
- get
- update
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/clusterrolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: ingress-nginx-admission
subjects:
- kind: ServiceAccount
name: ingress-nginx-admission
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
rules:
- apiGroups:
- ''
resources:
- secrets
verbs:
- get
- create
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: ingress-nginx-admission
subjects:
- kind: ServiceAccount
name: ingress-nginx-admission
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/job-createSecret.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: ingress-nginx-admission-create
annotations:
helm.sh/hook: pre-install,pre-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
spec:
template:
metadata:
name: ingress-nginx-admission-create
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
spec:
containers:
- name: create
image: docker.io/jettech/kube-webhook-certgen:v1.5.1
imagePullPolicy: IfNotPresent
args:
- create
- --host=ingress-nginx-controller-admission,ingress-nginx-controller-admission.$(POD_NAMESPACE).svc
- --namespace=$(POD_NAMESPACE)
- --secret-name=ingress-nginx-admission
env:
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
restartPolicy: OnFailure
serviceAccountName: ingress-nginx-admission
securityContext:
runAsNonRoot: true
runAsUser: 2000
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/job-patchWebhook.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: ingress-nginx-admission-patch
annotations:
helm.sh/hook: post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
spec:
template:
metadata:
name: ingress-nginx-admission-patch
labels:
helm.sh/chart: ingress-nginx-3.27.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.45.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
spec:
containers:
- name: patch
image: docker.io/jettech/kube-webhook-certgen:v1.5.1
imagePullPolicy: IfNotPresent
args:
- patch
- --webhook-name=ingress-nginx-admission
- --namespace=$(POD_NAMESPACE)
- --patch-mutating=false
- --secret-name=ingress-nginx-admission
- --patch-failure-policy=Fail
env:
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
restartPolicy: OnFailure
serviceAccountName: ingress-nginx-admission
securityContext:
runAsNonRoot: true
runAsUser: 2000
2.1、部署Ingress nginx
# 部署
[root@k8s-master-01 k8s]# kubectl apply -f deploy.yaml
# 查看（部署成功）
[root@k8s-master-01 k8s]# kubectl get pods -n ingress-nginx
NAME READY STATUS RESTARTS AGE
ingress-nginx-admission-create-4lhx6 0/1 Completed 0 94s
ingress-nginx-admission-patch-98mdd 0/1 Completed 2 94s
ingress-nginx-controller-66bb86f576-27vgs 1/1 Running 0 94s
2.2、创建Ingress nginx
[root@k8s-master-01 k8s]# vim ingress.yaml
---
kind: Ingress
apiVersion: extensions/v1beta1
metadata:
name: django
spec:
rules: # 规则
- host: www.django.com # 域名
http:
paths:
- backend:
serviceName: django
servicePort: 80
path: /
# 错误之后，默认跳转的后端
nginx.ingress.kubernetes.io/custom-http-errors: "404,415,500,502"
nginx.ingress.kubernetes.io/default-backend: error
# 永久性重定向
nginx.ingress.kubernetes.io/permanent-redirect: https://www.baidu.com
# 最大链接数
nginx.ingress.kubernetes.io/global-rate-limit: 1
# 白名单
nginx.ingress.kubernetes.io/whitelist-source-range: 192.168.11.102
# 自定义配置
nginx.ingress.kubernetes.io/configuration-snippet: |
deny 192.168.102;
allow all;
2.3、使用Ingress
# 部署
[root@k8s-master-01 k8s]# kubectl apply -f ingress.yaml
# 查看
[root@k8s-master-01 k8s]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
django <none> www.django.com 192.168.15.102 80 5m47s
把www.django.com放到本地hosts解析：192.168.15.101 www.django.com
2.4、测试
# 查看向外暴露的端口
[root@k8s-master-01 k8s]# kubectl get svc -n ingress-nginx
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller NodePort 10.107.214.63 <none> 80:32138/TCP,443:32468/TCP 19m
ingress-nginx-controller-admission ClusterIP 10.97.29.113 <none> 443/TCP 19m
# 浏览器测试
http://www.django.com:32138/
3、具体使用看文档
https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/
三、DaemonSet
1、简介
DaemonSet确保集群中每个（部分）node运行一份pod副本，当node加入集群时创建pod，当node离开集群时回收pod。如果删除DaemonSet，其创建的所有pod也被删除，DaemonSet中的pod覆盖整个集群。
当需要在集群内每个node运行同一个pod，使用DaemonSet是有价值的，以下是典型使用场景：
运行集群存储守护进程，如glusterd、ceph。
运行集群日志收集守护进程，如fluentd、logstash。
运行节点监控守护进程，如Prometheus Node Exporter, collectd, Datadog agent, New Relic agent, or Ganglia gmond。
2、创建DaemonSet
---
kind: DaemonSet
apiVersion: apps/v1
metadata:
name: daemonset
spec:
selector:
matchLabels:
app: daemonset
template:
metadata:
labels:
app: daemonset
spec:
containers:
- name: nginx
image: nginx
3、部署
# 部署
[root@k8s-master-01 k8s]# kubectl apply -f daemonset.yaml
daemonset.apps/daemonset create
# 查看
[root@k8s-master-01 k8s]# kubectl get pods
NAME READY STATUS RESTARTS AGE
daemonset-6gll8 1/1 Running 0 32s
# 有几个none节点就有几个pod，master节点有污点是不能被调度的，所以master节点没有。
四、StatefulSet
1、简介
1.RC、Deployment、DaemonSet都是面向无状态的服务，它们所管理的Pod的IP、名字，启停顺序等都是随机的，而StatefulSet是什么？顾名思义，有状态的集合，管理所有有状态的服务，比如MySQL、MongoDB集群等。
2.StatefulSet本质上是Deployment的一种变体，在v1.9版本中已成为GA版本，它为了解决有状态服务的问题，它所管理的Pod拥有固定的Pod名称，启停顺序，在StatefulSet中，Pod名字称为网络标识(hostname)，还必须要用到共享存储。
# 有状态集合，启动有顺序，部署在有状态的架构中
2、创建StatefulSet
[root@k8s-master-01 k8s]# vim statefulset.yaml
---
kind: Service
apiVersion: v1
metadata:
name: statefulset
spec:
selector:
app: statefulset
ports:
- port: 80
targetPort: 80
---
kind: StatefulSet
apiVersion: apps/v1
metadata:
name: statefulset
spec:
replicas: 5
selector:
matchLabels:
app: statefulset
serviceName: statefulset # 依赖于service
template:
metadata:
labels:
app: statefulset
spec:
containers:
- name: nginx
image: nginx
3、部署
# 部署
[root@k8s-master-01 k8s]# kubectl apply -f statefulset.yaml
# 查看
[root@k8s-master-01 k8s]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
statefulset-0 0/1 Pending 0 0s
statefulset-0 0/1 ContainerCreating 0 0s
statefulset-0 1/1 Running 0 2s
statefulset-1 0/1 Pending 0 0s
statefulset-1 0/1 Pending 0 0s
statefulset-1 0/1 ContainerCreating 0 0s
...
# 明显看出是有状态的
五、Job
1、简介
Job：类似于定时任务，工作类容器则是一次性任务,比如批处理程序,完成后容器就退出
# 应用场景
1.批处理任务： 比如说你想每天运行一次批处理任务，或者在指定日程中运行。它可能是像从存储库或数据库中读取文件那样，将它们分配给一个服务来处理文件。
2.容器按照持续运行的时间可分为两类:服务类容器和工作类容器
服务类容器通常持续提供服务,需要一直运行,比如HTTPServer、Daemon等。工作类容器则是一次性任务,比如批处理程序,完成后容器就退出
3.Kubernetes的Deployment、ReplicaSet和DaemonSet都用于管理服务类容器;对于工作类容器,我们使用Job
2、创建Job
---
kind: Job
apiVersion: batch/v1
metadata:
name: job
spec:
template:
metadata:
labels:
app: job
spec:
restartPolicy: OnFailure
containers:
- name: mysql
image: mysql:5.7
command:
- "/bin/sh"
- "-c"
- "mysql -uroot -hmysql.mysql.svc.cluster.local -p123456 -e 'select sleep(20);'"
3、部署
# 部署
[root@k8s-master-01 k8s]# kubectl apply -f job.yaml
job.batch/job created
# 查看（只执行一次）
[root@k8s-master-01 k8s]# kubectl get pods
NAME READY STATUS RESTARTS AGE
job-xl8sh 0/1 Completed 0 47s
六、cronJob
1、简介
CronJob用于实现定时任务，像Linux的Crontab一样。
定时任务
应用场景：通知，备份
2、创建cronJob
---
kind: CronJob
apiVersion: batch/v1beta1
metadata:
name: cronjob
spec:
jobTemplate:
metadata:
labels:
app: cronjob
spec:
template:
metadata:
labels:
app: cronjob
spec:
restartPolicy: OnFailure
containers:
- name: mysql
image: mysql:5.7
command:
- "/bin/sh"
- "-c"
- "mysql -uroot -hmysql.mysql.svc.cluster.local -p123456 -e 'select sleep(20);'"
schedule: '* * * * *'
3、部署
# 部署
[root@k8s-master-01 k8s]# kubectl apply -f cronjob.yaml
cronjob.batch/cronjob created
# 查看（每分钟执行一次）
[root@k8s-master-01 k8s]# kubectl get cronjob.batch
NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
cronjob * * * * * False 1 9s 80s
[root@k8s-master-01 k8s]# kubectl get pods
NAME READY STATUS RESTARTS AGE
cronjob-27361969-nm5kh 0/1 Completed 0 2m51s
cronjob-27361970-4c7j8 0/1 Completed 0 111s
cronjob-27361971-5pm42 0/1 Completed 0 51s
[root@k8s-master-01 k8s]# kubectl get job
NAME COMPLETIONS DURATION AGE
cronjob-27361969 1/1 21s 3m20s
cronjob-27361970 1/1 21s 2m20s
cronjob-27361971 1/1 21s 80s
cronjob-27361972 0/1 20s 20s