Docker(二十七)k8s 搭建有状态集群服务1
以consul 为例首先搭建有状态集群服务，先要了解服务集群本身的工作原理，conusl 在启动的时候，是只要bootstrap-expect 达到数量，集群内部就可以选举出leader
另外，headless 服务，和一般service 相比，差别是，没有clusterip，所以在发现服务的时候，是直接绑定了dns，所以在consul 节点加入集群的时候，可以写-retry-join=$(NAMESPACE), 这个里的命名空间变量是headless 的服务名字，nslookup 解析的时候 就可以解析出集群的所有绑定上的ip
以下为yaml 配置
这里有必要提一句，一般无头服务都要配置动态存储来使用，这样方便 当集群中有成员挂掉，当再次加入进群的时候，会根据自身的id 与绑定的存储空间，可以快速加载之前的数据
consul_statefulset.yml
consul_statefulset.ymlconsul_statefulset.ymlapiVersion: apps/v1beta1
kind: StatefulSet
metadata:
name: qa-consul
spec:
serviceName: qa-consul
replicas: 5
template:
metadata:
labels:
app: qa-consul
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- qa-consul
topologyKey: kubernetes.io/hostname
terminationGracePeriodSeconds: 10
containers:
- name: consul
image: consul:latest
args:
- "agent"
- "-server"
- "-bootstrap-expect=3"
- "-ui"
- "-data-dir=/consul/data"
- "-bind=0.0.0.0"
- "-client=0.0.0.0"
- "-advertise=$(PODIP)"
- "-retry-join=qa-consul"
# - "-retry-join=consul-0.consul.$(NAMESPACE).svc.cluster.local"
# - "-retry-join=consul-1.consul.$(NAMESPACE).svc.cluster.local"
# - "-retry-join=consul-2.consul.$(NAMESPACE).svc.cluster.local"
- "-domain=cluster.local"
- "-disable-host-node-id"
volumeMounts:
- name: data
mountPath: /consul/data
env:
- name: PODIP
valueFrom:
fieldRef:
fieldPath: metadata.namespace
ports:
- containerPort: 8500
name: ui-port
- containerPort: 8400
name: alt-port
- containerPort: 53
name: udp-port
- containerPort: 8443
name: https-port
- containerPort: 8080
name: http-port
- containerPort: 8301
name: serflan
- containerPort: 8302
name: serfwan
- containerPort: 8600
name: consuldns
- containerPort: 8300
name: server
volumes:
- name: data
hostPath:
path: /home/dataconsul_service.yml
apiVersion: v1
kind: Service
metadata:
name: qa-consul
labels:
name: qa-consul
spec:
type: ClusterIP
ports:
- name: http
port: 8500
targetPort: 8500
- name: https
port: 8443
targetPort: 8443
- name: rpc
port: 8400
targetPort: 8400
- name: serflan-tcp
protocol: "TCP"
port: 8301
targetPort: 8301
- name: serflan-udp
protocol: "UDP"
port: 8301
targetPort: 8301
- name: serfwan-tcp
protocol: "TCP"
port: 8302
targetPort: 8302
- name: serfwan-udp
protocol: "UDP"
port: 8302
targetPort: 8302
- name: server
port: 8300
targetPort: 8300
- name: consuldns
port: 8600
targetPort: 8600
selector:
app: qa-consul
clusterIP: None
bootstrap-expectbootstrap-expectbootstrap-expect 未完 待续。。。。。
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