k8s创建consul服务
k8s以StatefulSet方式部署consul集群：
public-service-ns.yaml
apiVersion: v1
kind: Namespace
metadata:
name: public-service
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consul-server.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: consul
namespace: public-service
spec:
rules:
- host: consul.lzxlinux.com
http:
paths:
- path: /
backend:
serviceName: consul-ui
servicePort: 80
---
apiVersion: v1
kind: Service
metadata:
name: consul-ui
namespace: public-service
labels:
app: consul
component: server
spec:
selector:
app: consul
component: server
ports:
- name: http
port: 80
targetPort: 8500
---
apiVersion: v1
kind: Service
metadata:
name: consul-dns
namespace: public-service
labels:
app: consul
component: dns
spec:
selector:
app: consul
ports:
- name: dns-tcp
protocol: TCP
port: 53
targetPort: dns-tcp
- name: dns-udp
protocol: UDP
port: 53
targetPort: dns-udp
---
apiVersion: v1
kind: Service
metadata:
name: consul-server
namespace: public-service
labels:
app: consul
component: server
spec:
selector:
app: consul
component: server
ports:
- name: http
port: 8500
targetPort: 8500
- name: dns-tcp
protocol: TCP
port: 8600
targetPort: dns-tcp
- name: dns-udp
protocol: "UDP"
port: 8600
targetPort: dns-udp
- name: serflan-tcp
protocol: TCP
port: 8301
targetPort: 8301
- name: serflan-udp
protocol: UDP
port: 8301
targetPort: 8302
- name: serfwan-tcp
protocol: TCP
port: 8302
targetPort: 8302
- name: serfwan-udp
protocol: UDP
port: 8302
targetPort: 8302
- name: server
port: 8300
targetPort: 8300
publishNotReadyAddresses: true
clusterIP: None
---
apiVersion: v1
kind: ConfigMap
metadata:
name: consul-server-config
namespace: public-service
data:
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
name: consul-server
namespace: public-service
spec:
selector:
matchLabels:
app: consul
component: server
minAvailable: 2
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: consul-server
namespace: public-service
spec:
serviceName: consul-server
replicas: 3
updateStrategy:
type: RollingUpdate
selector:
matchLabels:
app: consul
component: server
template:
metadata:
labels:
app: consul
component: server
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: "componment"
operator: In
values:
- server
topologyKey: "kubernetes.io/hostname"
terminationGracePeriodSeconds: 10
containers:
- name: consul
image: consul:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8500
name: http
- containerPort: 8600
name: dns-tcp
protocol: TCP
- containerPort: 8600
name: dns-udp
protocol: UDP
- containerPort: 8301
name: serflan
- containerPort: 8302
name: serfwan
- containerPort: 8300
name: server
env:
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
args:
- "agent"
- "-server"
- "-advertise=$(POD_IP)"
- "-bind=0.0.0.0"
- "-bootstrap-expect=3"
- "-datacenter=dc1"
- "-config-dir=/consul/userconfig"
- "-data-dir=/consul/data"
- "-disable-host-node-id"
- "-domain=cluster.local"
- "-retry-join=consul-server-0.consul-server.$(NAMESPACE).svc.cluster.local"
- "-retry-join=consul-server-1.consul-server.$(NAMESPACE).svc.cluster.local"
- "-retry-join=consul-server-2.consul-server.$(NAMESPACE).svc.cluster.local"
- "-client=0.0.0.0"
- "-ui"
resources:
limits:
cpu: "100m"
memory: "128Mi"
requests:
cpu: "100m"
memory: "128Mi"
lifecycle:
preStop:
exec:
command:
- /bin/sh
- -c
- consul leave
volumeMounts:
- name: data
mountPath: /consul/data
- name: user-config
mountPath: /consul/userconfig
volumes:
- name: user-config
configMap:
name: consul-server-config
- name: data
emptyDir: {}
securityContext:
fsGroup: 1000
# volumeClaimTemplates:
# - metadata:
# name: data
# spec:
# accessModes:
# - ReadWriteMany
# storageClassName: "gluster-heketi-2"
# resources:
# requests:
# storage: 10Gi
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consul-client.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: consul-client-config
namespace: public-service
data:
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: consul
namespace: public-service
spec:
selector:
matchLabels:
app: consul
component: client
template:
metadata:
labels:
app: consul
component: client
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: "componment"
operator: In
values:
- client
topologyKey: "kubernetes.io/hostname"
terminationGracePeriodSeconds: 10
containers:
- name: consul
image: consul:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8500
name: http
- containerPort: 8600
name: dns-tcp
protocol: TCP
- containerPort: 8600
name: dns-udp
protocol: UDP
- containerPort: 8301
name: serflan
- containerPort: 8302
name: serfwan
- containerPort: 8300
name: server
env:
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
args:
- "agent"
- "-advertise=$(POD_IP)"
- "-bind=0.0.0.0"
- "-datacenter=dc1"
- "-config-dir=/consul/userconfig"
- "-data-dir=/consul/data"
- "-disable-host-node-id=true"
- "-domain=cluster.local"
- "-retry-join=consul-server-0.consul-server.$(NAMESPACE).svc.cluster.local"
- "-retry-join=consul-server-1.consul-server.$(NAMESPACE).svc.cluster.local"
- "-retry-join=consul-server-2.consul-server.$(NAMESPACE).svc.cluster.local"
- "-client=0.0.0.0"
resources:
limits:
cpu: "50m"
memory: "32Mi"
requests:
cpu: "50m"
memory: "32Mi"
lifecycle:
preStop:
exec:
command:
- /bin/sh
- -c
- consul leave
volumeMounts:
- name: data
mountPath: /consul/data
- name: user-config
mountPath: /consul/userconfig
volumes:
- name: user-config
configMap:
name: consul-client-config
- name: data
emptyDir: {}
securityContext:
fsGroup: 1000
# volumeClaimTemplates:
# - metadata:
# name: data
# spec:
# accessModes:
# - ReadWriteMany
# storageClassName: "gluster-heketi-2"
# resources:
# requests:
# storage: 10Gi
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PodDisruptionBudget：
k8s可以为每个应用程序创建 PodDisruptionBudget 对象（PDB）。PDB 将限制在同一时间因资源干扰导致的复制应用程序中宕机的 pod 数量。
可以通过两个参数来配置PodDisruptionBudget：
MinAvailable：表示最小可用Pod数，表示应用Pod集群处于运行状态的最小Pod数量，或者是运行状态的Pod数同总Pod数的最小百分比
MaxUnavailable：表示最大不可用Pod数，表示应用Pod集群处于不可用状态的最大Pod数，或者是不可用状态的Pod数同总Pod数的最大百分比
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需要注意的是，MinAvailable参数和MaxUnavailable参数只能同时配置一个。
部署：
kubectl apply -f public-service-ns.yaml
kubectl apply -f consul-server.yaml
kubectl get svc -n public-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
consul-dns ClusterIP 10.110.235.63 53/TCP,53/UDP 85s
consul-server ClusterIP None 8500/TCP,8600/TCP,8600/UDP,8301/TCP,8301/UDP,8302/TCP,8302/UDP,8300/TCP 85s
consul-ui ClusterIP 10.98.220.223 80/TCP 85s
kubectl get pod -n public-service
NAME READY STATUS RESTARTS AGE
consul-server-0 1/1 Running 0 110s
consul-server-1 1/1 Running 0 107s
consul-server-2 1/1 Running 0 92s
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查看集群状态：
kubectl exec -n public-service consul-server-0 -- consul members
Node Address Status Type Build Protocol DC Segment
consul-server-0 172.10.135.17:8301 alive server 1.8.3 2 dc1
consul-server-1 172.10.104.11:8301 alive server 1.8.3 2 dc1
consul-server-2 172.10.166.136:8301 alive server 1.8.3 2 dc1
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访问ui：
添加hosts：consul.lzxlinux.com，访问consul.lzxlinux.com/ui。