前言
为了配置kubernetes中的ingress的高可用，对于kubernetes集群以外只暴露一个访问入口，需要使用keepalived排除单点问题。需要使用daemonset方式将ingress-controller部署在边缘节点上。
边缘节点
首先解释下什么叫边缘节点（Edge Node），所谓的边缘节点即集群内部用来向集群外暴露服务能力的节点，集群外部的服务通过该节点来调用集群内部的服务，边缘节点是集群内外交流的一个Endpoint。
边缘节点要考虑两个问题
- 边缘节点的高可用，不能有单点故障，否则整个kubernetes集群将不可用
- 对外的一致暴露端口，即只能有一个外网访问IP和端口
架构
为了满足边缘节点的以上需求，我们使用keepalived来实现。
在Kubernetes中添加了ingress后，在DNS中添加A记录，域名为你的ingress中host的内容，IP为你的keepalived的VIP，这样集群外部就可以通过域名来访问你的服务，也解决了单点故障。
选择Kubernetes的三个node作为边缘节点，并安装keepalived。
安装keepalived服务
yum install -y keepalived
node1的keealived配置
cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id edgenode
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 88
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.40.0.109 dev eth0 label eth0:1
}
}
node2 keepalive配置
cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id edgenode
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 88
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.40.0.109 dev eth0 label eth0:1
}
}
node3 keepalived配置
cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id edgenode
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 88
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.40.0.109 dev eth0 label eth0:1
}
}
设置keepalived开机自启动
systemctl enable keepalived.service
启动keepalived服务
systemctl start keepalived.service
安装ingress-nginx
给边缘节点打标签
kubectl label nodes 10.40.0.105 edgenode=true kubectl label nodes 10.40.0.106 edgenode=true kubectl label nodes 10.40.0.107 edgenode=true
查看node标签
[[email protected] ingress]# kubectl get node --show-labels NAME STATUS ROLES AGE VERSION LABELS 10.40.0.105 Ready <none> 25d v1.12.1 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,edgenode=true,kubernetes.io/hostname=10.40.0.105 10.40.0.106 Ready <none> 25d v1.12.1 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,edgenode=true,env_role=dev,kubernetes.io/hostname=10.40.0.106 10.40.0.107 Ready <none> 17d v1.12.1 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,edgenode=true,kubernetes.io/hostname=10.40.0.
将原来ingress的yaml文件由deployment改为daemonset
cat ingress-daemonset.yaml
apiVersion: extensions/v1beta1
#kind: Deployment
kind: DaemonSet
metadata:
name: nginx-ingress-controller
namespace: ingress-nginx
spec:
#replicas: 3
#selector:
#matchLabels:
#app: ingress-nginx
template:
metadata:
labels:
app: ingress-nginx
annotations:
prometheus.io/port: ‘10254‘
prometheus.io/scrape: ‘true‘
spec:
serviceAccountName: nginx-ingress-serviceaccount
hostNetwork: true
nodeSelector:
edgenode: ‘true‘
containers:
- name: nginx-ingress-controller
image: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:0.20.0
args:
- /nginx-ingress-controller
- --default-backend-service=$(POD_NAMESPACE)/default-http-backend
- --configmap=$(POD_NAMESPACE)/nginx-configuration
- --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
- --udp-services-configmap=$(POD_NAMESPACE)/udp-services
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
ports:
- name: http
containerPort: 80
- name: https
containerPort: 443
livenessProbe:
failureThreshold: 3
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
readinessProbe:
failureThreshold: 3
httpGet:
path: /healthz
port: 10254
scheme: HTTP
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
namespace部署文件
cat namespace.yaml apiVersion: v1 kind: Namespace metadata: name: ingress-nginx
configmap部署文件
cat configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: nginx-configuration
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
rbac部署文件
cat rbac.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: nginx-ingress-serviceaccount
namespace: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
name: nginx-ingress-clusterrole
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"
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- events
verbs:
- create
- patch
- apiGroups:
- "extensions"
resources:
- ingresses/status
verbs:
- update
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
name: nginx-ingress-role
namespace: ingress-nginx
rules:
- apiGroups:
- ""
resources:
- configmaps
- pods
- secrets
- namespaces
verbs:
- get
- apiGroups:
- ""
resources:
- configmaps
resourceNames:
# Defaults to "<election-id>-<ingress-class>"
# Here: "<ingress-controller-leader>-<nginx>"
# This has to be adapted if you change either parameter
# when launching the nginx-ingress-controller.
- "ingress-controller-leader-nginx"
verbs:
- get
- update
- apiGroups:
- ""
resources:
- configmaps
verbs:
- create
- apiGroups:
- ""
resources:
- endpoints
verbs:
- get
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
name: nginx-ingress-role-nisa-binding
namespace: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: nginx-ingress-role
subjects:
- kind: ServiceAccount
name: nginx-ingress-serviceaccount
namespace: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: nginx-ingress-clusterrole-nisa-binding
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: nginx-ingress-clusterrole
subjects:
- kind: ServiceAccount
name: nginx-ingress-serviceaccount
namespace: ingress-nginx
tcp-service-configmap
cat tcp-services-configmap.yaml kind: ConfigMap apiVersion: v1 metadata: name: tcp-services namespace: ingress-nginx
udp-servcie-configmap
cat udp-services-configmap.yaml kind: ConfigMap apiVersion: v1 metadata: name: udp-services namespace: ingress-nginx
default-backend
cat default-backend.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: default-http-backend
labels:
app: default-http-backend
namespace: ingress-nginx
spec:
replicas: 1
template:
metadata:
labels:
app: default-http-backend
spec:
terminationGracePeriodSeconds: 60
containers:
- name: default-http-backend
# Any image is permissable as long as:
# 1. It serves a 404 page at /
# 2. It serves 200 on a /healthz endpoint
image: registry.cn-hangzhou.aliyuncs.com/google_containers/defaultbackend:1.4
livenessProbe:
httpGet:
path: /healthz
port: 8080
scheme: HTTP
initialDelaySeconds: 30
timeoutSeconds: 5
ports:
- containerPort: 8080
resources:
limits:
cpu: 10m
memory: 20Mi
requests:
cpu: 10m
memory: 20Mi
---
apiVersion: v1
kind: Service
metadata:
name: default-http-backend
namespace: ingress-nginx
labels:
app: default-http-backend
spec:
ports:
- port: 80
targetPort: 8080
selector:
app: default-http-backend
部署
kubectl create -f namespace.yaml kubectl create -f configmap.yaml kubectl create -f rbac.yaml kubectl create -f default-backend.yaml kubectl create -f tcp-services-configmap.yaml kubectl create -f udp-services-configmap.yaml kubectl create -f ingress-daemonset.yaml
查看ingress-controller
[[email protected] ingress]# kubectl get ds -n ingress-nginx NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE nginx-ingress-controller 3 3 3 3 3 edgenode=true 57m
[[email protected] ingress]# kubectl get pods -n ingress-nginx -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE default-http-backend-86569b9d95-x4bsn 1/1 Running 12 24d 172.17.65.6 10.40.0.105 <none> nginx-ingress-controller-5b7xg 1/1 Running 0 58m 10.40.0.105 10.40.0.105 <none> nginx-ingress-controller-b5mxc 1/1 Running 0 58m 10.40.0.106 10.40.0.106 <none> nginx-ingress-controller-t5n5k 1/1 Running 0 58m 10.40.0.107 10.40.0.107 <none>
原文地址：https://www.cnblogs.com/terrycy/p/10048165.html
时间： 2024-11-14 13:19:18