一、什么是微服务
用控制器来完成集群的工作负载，那么应用如何暴漏出去？需要通过微服务暴漏出去后才能被访问
-
Service是一组提供相同服务的Pod对外开放的接口。
-
借助Service，应用可以实现服务发现和负载均衡。
-
service默认只支持4层负载均衡能力，没有7层功能。（可以通过Ingress实现）
-
二 微服务的类型
| 微服务类型 | 作用描述 |
|---|---|
| ClusterIP | 默认值，k8s系统给service自动分配的虚拟IP，只能在集群内部访问 |
| NodePort | 将Service通过指定的Node上的端口暴露给外部，访问任意一个NodeIP:nodePort都将路由到ClusterIP |
| LoadBalancer | 在NodePort的基础上,借助cloud provider创建一个外部的负载均衡器，并将请求转发到 NodeIP:NodePort，此模式只能在云服务器上使用 |
| ExternalName | 将服务通过 DNS CNAME 记录方式转发到指定的域名（通过 spec.externlName 设定 |
示例：
生成控制器文件并建立控制器
bash
kubectl create deployment timinglee --image myapp:v1 --replicas 2 --dry-run=client -o yaml > timinglee.yaml生成微服务yaml追加到已有yaml中
bash
kubectl expose deployment timinglee --port 80 --target-port 80 --dry-run=client -o yaml >> timinglee.yaml
[root@k8s-master ~]# vim timinglee.yaml
bash
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: timinglee
name: timinglee
spec:
replicas: 2
selector:
matchLabels:
app: timinglee
template:
metadata:
creationTimestamp: null
labels:
app: timinglee
spec:
containers:
- image: myapp:v1
name: myapp
--- #不同资源间用---隔开
apiVersion: v1
kind: Service
metadata:
labels:
app: timinglee
name: timinglee
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
service/timinglee created
[root@k8s-master ~]# kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 19h
timinglee ClusterIP 10.99.127.134 <none> 80/TCP 16s
微服务默认使用iptables调度
[root@k8s-master ~]# kubectl get services -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 19h <none>
timinglee ClusterIP 10.99.127.134 <none> 80/TCP 119s app=timinglee #集群内部IP 134
#可以在火墙中查看到策略信息
[root@k8s-master ~]# iptables -t nat -nL
KUBE-SVC-I7WXYK76FWYNTTGM 6 -- 0.0.0.0/0 10.99.127.134 /* default/timinglee cluster IP */ tcp dpt:80三 ipvs模式
-
Service 是由 kube-proxy 组件，加上 iptables 来共同实现的
-
kube-proxy 通过 iptables 处理 Service 的过程，需要在宿主机上设置相当多的 iptables 规则，如果宿主机有大量的Pod，不断刷新iptables规则，会消耗大量的CPU资源
-
IPVS模式的service，可以使K8s集群支持更多量级的Pod
3.1 ipvs模式配置方式
1 在所有节点中安装ipvsadm
[root@k8s-所有节点 pod]yum install ipvsadm –y2 修改master节点的代理配置
[root@k8s-master ~]# kubectl -n kube-system edit cm kube-proxy
metricsBindAddress: ""
mode: "ipvs" #设置kube-proxy使用ipvs模式
nftables:3 重启pod，在pod运行时配置文件中采用默认配置，当改变配置文件后已经运行的pod状态不会变化，所以要重启pod
[root@k8s-master ~]# kubectl -n kube-system get pods | awk '/kube-proxy/{system("kubectl -n kube-system delete pods "$1)}'
[root@k8s-master ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.96.0.1:443 rr
-> 172.25.254.100:6443 Masq 1 0 0
TCP 10.96.0.10:53 rr
-> 10.244.0.2:53 Masq 1 0 0
-> 10.244.0.3:53 Masq 1 0 0
TCP 10.96.0.10:9153 rr
-> 10.244.0.2:9153 Masq 1 0 0
-> 10.244.0.3:9153 Masq 1 0 0
TCP 10.97.59.25:80 rr
-> 10.244.1.17:80 Masq 1 0 0
-> 10.244.2.13:80 Masq 1 0 0
UDP 10.96.0.10:53 rr
-> 10.244.0.2:53 Masq 1 0 0
-> 10.244.0.3:53 Masq 1 0 0
[!NOTE]
切换ipvs模式后，kube-proxy会在宿主机上添加一个虚拟网卡：kube-ipvs0，并分配所有service IP
[root@k8s-master ~]# ip a | tail inet6 fe80::c4fb:e9ff:feee:7d32/64 scope link valid_lft forever preferred_lft forever 8: kube-ipvs0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default link/ether fe:9f:c8:5d:a6:c8 brd ff:ff:ff:ff:ff:ff inet 10.96.0.10/32 scope global kube-ipvs0 valid_lft forever preferred_lft forever inet 10.96.0.1/32 scope global kube-ipvs0 valid_lft forever preferred_lft forever inet 10.97.59.25/32 scope global kube-ipvs0 valid_lft forever preferred_lft forever
四 微服务类型详解
4.1 clusterip
特点：
clusterip模式只能在集群内访问，并对集群内的pod提供健康检测和自动发现功能
示例：
[root@k8s2 service]# vim myapp.yml
---
apiVersion: v1
kind: Service
metadata:
labels:
app: timinglee
name: timinglee
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
type: ClusterIP
service创建后集群DNS提供解析
[root@k8s-master ~]# dig timinglee.default.svc.cluster.local @10.96.0.10
; <<>> DiG 9.16.23-RH <<>> timinglee.default.svc.cluster.local @10.96.0.10
;; global options: +cmd
;; Got answer:
;; WARNING: .local is reserved for Multicast DNS
;; You are currently testing what happens when an mDNS query is leaked to DNS
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27827
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 057d9ff344fe9a3a (echoed)
;; QUESTION SECTION:
;timinglee.default.svc.cluster.local. IN A
;; ANSWER SECTION:
timinglee.default.svc.cluster.local. 30 IN A 10.97.59.25
;; Query time: 8 msec
;; SERVER: 10.96.0.10#53(10.96.0.10)
;; WHEN: Wed Sep 04 13:44:30 CST 2024
;; MSG SIZE rcvd: 1274.2 ClusterIP中的特殊模式headless
headless（无头服务）
对于无头 Services 并不会分配 Cluster IP，kube-proxy不会处理它们， 而且平台也不会为它们进行负载均衡和路由，集群访问通过dns解析直接指向到业务pod上的IP，所有的调度有dns单独完成
[root@k8s-master ~]# vim timinglee.yaml
---
apiVersion: v1
kind: Service
metadata:
labels:
app: timinglee
name: timinglee
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
type: ClusterIP
clusterIP: None
[root@k8s-master ~]# kubectl delete -f timinglee.yaml
[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
#测试
[root@k8s-master ~]# kubectl get services timinglee
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
timinglee ClusterIP None <none> 80/TCP 6s
[root@k8s-master ~]# dig timinglee.default.svc.cluster.local @10.96.0.10
; <<>> DiG 9.16.23-RH <<>> timinglee.default.svc.cluster.local @10.96.0.10
;; global options: +cmd
;; Got answer:
;; WARNING: .local is reserved for Multicast DNS
;; You are currently testing what happens when an mDNS query is leaked to DNS
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51527
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 81f9c97b3f28b3b9 (echoed)
;; QUESTION SECTION:
;timinglee.default.svc.cluster.local. IN A
;; ANSWER SECTION:
timinglee.default.svc.cluster.local. 20 IN A 10.244.2.14 #直接解析到pod上
timinglee.default.svc.cluster.local. 20 IN A 10.244.1.18
;; Query time: 0 msec
;; SERVER: 10.96.0.10#53(10.96.0.10)
;; WHEN: Wed Sep 04 13:58:23 CST 2024
;; MSG SIZE rcvd: 178
#开启一个busyboxplus的pod测试
[root@k8s-master ~]# kubectl run test --image busyboxplus -it
If you don't see a command prompt, try pressing enter.
/ # nslookup timinglee-service
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: timinglee-service
Address 1: 10.244.2.16 10-244-2-16.timinglee-service.default.svc.cluster.local
Address 2: 10.244.2.17 10-244-2-17.timinglee-service.default.svc.cluster.local
Address 3: 10.244.1.22 10-244-1-22.timinglee-service.default.svc.cluster.local
Address 4: 10.244.1.21 10-244-1-21.timinglee-service.default.svc.cluster.local
/ # curl timinglee-service
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
/ # curl timinglee-service/hostname.html
timinglee-c56f584cf-b8t6m
4.3 nodeport
通过ipvs暴漏端口从而使外部主机通过master节点的对外ip:<port>来访问pod业务
其访问过程为：
示例：
[root@k8s-master ~]# vim timinglee.yaml
bash
---
apiVersion: v1
kind: Service
metadata:
labels:
app: timinglee-service
name: timinglee-service
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
type: NodePort
[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
service/timinglee-service created
[root@k8s-master ~]# kubectl get services timinglee-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
timinglee-service NodePort 10.98.60.22 <none> 80:31771/TCP 8
nodeport在集群节点上绑定端口，一个端口对应一个服务
[root@k8s-master ~]# for i in {1..5}
> do
> curl 172.25.254.100:31771/hostname.html
> done
timinglee-c56f584cf-fjxdk
timinglee-c56f584cf-5m2z5
timinglee-c56f584cf-z2w4d
timinglee-c56f584cf-tt5g6
timinglee-c56f584cf-fjxdk
[!NOTE]
nodeport默认端口
nodeport默认端口是30000-32767，超出会报错
[root@k8s-master ~]# vim timinglee.yaml
apiVersion: v1
kind: Service
metadata:
labels:
app: timinglee-service
name: timinglee-service
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
nodePort: 33333
selector:
app: timinglee
type: NodePort
[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
The Service "timinglee-service" is invalid: spec.ports[0].nodePort: Invalid value: 33333: provided port is not in the valid range. The range of valid ports is 30000-32767如果需要使用这个范围以外的端口就需要特殊设定
[root@k8s-master ~]# vim /etc/kubernetes/manifests/kube-apiserver.yaml
- --service-node-port-range=30000-40000[!NOTE]
添加"--service-node-port-range=" 参数，端口范围可以自定义
修改后api-server会自动重启，等apiserver正常启动后才能操作集群
集群重启自动完成在修改完参数后全程不需要人为干预
4.4 loadbalancer
云平台会为我们分配vip并实现访问，如果是裸金属主机那么需要metallb来实现ip的分配
[root@k8s-master ~]# vim timinglee.yaml
bash
---
apiVersion: v1
kind: Service
metadata:
labels:
app: timinglee-service
name: timinglee-service
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
type: LoadBalancer
[root@k8s2 service]# kubectl apply -f myapp.yml
默认无法分配外部访问IP
[root@k8s2 service]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 4d1h
myapp LoadBalancer 10.107.23.134 <pending> 80:32537/TCP 4s
LoadBalancer模式适用云平台，裸金属环境需要安装metallb提供支持4.5 metalLB
官网：Installation :: MetalLB, bare metal load-balancer for Kubernetes
metalLB功能
为LoadBalancer分配vip
部署方式
1.设置ipvs模式
[root@k8s-master ~]# kubectl edit cm -n kube-system kube-proxy
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: "ipvs"
ipvs:
strictARP: true
[root@k8s-master ~]# kubectl -n kube-system get pods | awk '/kube-proxy/{system("kubectl -n kube-system delete pods "$1)}'
2.下载部署文件
[root@k8s2 metallb]# wget https://raw.githubusercontent.com/metallb/metallb/v0.13.12/config/manifests/metallb-native.yaml
3.修改文件中镜像地址,与harbor仓库路径保持一致
[root@k8s-master ~]# vim metallb-native.yaml
...
image: metallb/controller:v0.14.8
image: metallb/speaker:v0.14.8
4.上传镜像到harbor
[root@k8s-master ~]# docker pull quay.io/metallb/controller:v0.14.8
[root@k8s-master ~]# docker pull quay.io/metallb/speaker:v0.14.8
[root@k8s-master ~]# docker tag quay.io/metallb/speaker:v0.14.8 reg.timinglee.org/metallb/speaker:v0.14.8
[root@k8s-master ~]# docker tag quay.io/metallb/controller:v0.14.8 reg.timinglee.org/metallb/controller:v0.14.8
[root@k8s-master ~]# docker push reg.timinglee.org/metallb/speaker:v0.14.8
[root@k8s-master ~]# docker push reg.timinglee.org/metallb/controller:v0.14.8
部署服务
[root@k8s2 metallb]# kubectl apply -f metallb-native.yaml
[root@k8s-master ~]# kubectl -n metallb-system get pods
NAME READY STATUS RESTARTS AGE
controller-65957f77c8-25nrw 1/1 Running 0 30s
speaker-p94xq 1/1 Running 0 29s
speaker-qmpct 1/1 Running 0 29s
speaker-xh4zh 1/1 Running 0 30s
配置分配地址段
[root@k8s-master ~]# vim configmap.yml
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
name: first-pool #地址池名称
namespace: metallb-system
spec:
addresses:
- 172.25.254.50-172.25.254.99 #修改为自己本地地址段
--- #两个不同的kind中间必须加分割
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
name: example
namespace: metallb-system
spec:
ipAddressPools:
- first-pool #使用地址池
[root@k8s-master ~]# kubectl apply -f configmap.yml
ipaddresspool.metallb.io/first-pool created
l2advertisement.metallb.io/example created
[root@k8s-master ~]# kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21h
timinglee-service LoadBalancer 10.109.36.123 172.25.254.50 80:31595/TCP 9m9s
#通过分配地址从集群外访问服务
[root@reg ~]# curl 172.25.254.50
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
4.6 externalname
-
开启services后，不会被分配IP，而是用dns解析CNAME固定域名来解决ip变化问题
-
一般应用于外部业务和pod沟通或外部业务迁移到pod内时
-
在应用向集群迁移过程中，externalname在过度阶段就可以起作用了。
-
集群外的资源迁移到集群时，在迁移的过程中ip可能会变化，但是域名+dns解析能完美解决此问题
示例：
[root@k8s-master ~]# vim timinglee.yaml
bash
---
apiVersion: v1
kind: Service
metadata:
labels:
app: timinglee-service
name: timinglee-service
spec:
selector:
app: timinglee
type: ExternalName
externalName: www.timinglee.org[root@k8s-master ~]# kubectl apply -f timinglee.yaml
[root@k8s-master ~]# kubectl get services timinglee-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
timinglee-service ExternalName <none> www.timinglee.org <none> 2m58s
五 Ingress-nginx
官网：
Installation Guide - Ingress-Nginx Controller
5.1 ingress-nginx功能
-
一种全局的、为了代理不同后端 Service 而设置的负载均衡服务,支持7层
-
Ingress由两部分组成：Ingress controller和Ingress服务
-
Ingress Controller 会根据你定义的 Ingress 对象，提供对应的代理能力。
-
业界常用的各种反向代理项目，比如 Nginx、HAProxy、Envoy、Traefik 等，都已经为Kubernetes 专门维护了对应的 Ingress Controller。
5.2 部署ingress
5.2.1 下载部署文件
[root@k8s-master ~]# wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.11.2/deploy/static/provider/baremetal/deploy.yaml上传ingress所需镜像到harbor
[root@k8s-master ~]# docker tag registry.k8s.io/ingress-nginx/controller:v1.11.2@sha256:d5f8217feeac4887cb1ed21f27c2674e58be06bd8f5184cacea2a69abaf78dce reg.timinglee.org/ingress-nginx/controller:v1.11.2
[root@k8s-master ~]# docker tag registry.k8s.io/ingress-nginx/kube-webhook-certgen:v1.4.3@sha256:a320a50cc91bd15fd2d6fa6de58bd98c1bd64b9a6f926ce23a600d87043455a3 reg.timinglee.org/ingress-nginx/kube-webhook-certgen:v1.4.3
[root@k8s-master ~]# docker push reg.timinglee.org/ingress-nginx/controller:v1.11.2
[root@k8s-master ~]# docker push reg.timinglee.org/ingress-nginx/kube-webhook-certgen:v1.4.35.2.2 安装ingress
[root@k8s-master ~]# vim deploy.yaml
445 image: ingress-nginx/controller:v1.11.2
546 image: ingress-nginx/kube-webhook-certgen:v1.4.3
599 image: ingress-nginx/kube-webhook-certgen:v1.4.3
[root@k8s-master ~]# kubectl -n ingress-nginx get pods
NAME READY STATUS RESTARTS AGE
ingress-nginx-admission-create-ggqm6 0/1 Completed 0 82s
ingress-nginx-admission-patch-q4wp2 0/1 Completed 0 82s
ingress-nginx-controller-bb7d8f97c-g2h4p 1/1 Running 0 82s
[root@k8s-master ~]# kubectl -n ingress-nginx get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller NodePort 10.103.33.148 <none> 80:34512/TCP,443:34727/TCP 108s
ingress-nginx-controller-admission ClusterIP 10.103.183.64 <none> 443/TCP 108s
#修改微服务为loadbalancer
[root@k8s-master ~]# kubectl -n ingress-nginx edit svc ingress-nginx-controller
49 type: LoadBalancer
[root@k8s-master ~]# kubectl -n ingress-nginx get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller LoadBalancer 10.103.33.148 172.25.254.50 80:34512/TCP,443:34727/TCP 4m43s
ingress-nginx-controller-admission ClusterIP 10.103.183.64 <none> 443/TCP 4m43s[!NOTE]
在ingress-nginx-controller中看到的对外IP就是ingress最终对外开放的ip
5.2.3 测试ingress
#生成yaml文件
[root@k8s-master ~]# kubectl create ingress webcluster --rule '*/=timinglee-svc:80' --dry-run=client -o yaml > timinglee-ingress.yml
[root@k8s-master ~]# vim timinglee-ingress.yml
bash
aapiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: test-ingress
spec:
ingressClassName: nginx
rules:
- http:
paths:
- backend:
service:
name: timinglee-svc
port:
number: 80
path: /
pathType: Prefix
#Exact（精确匹配），ImplementationSpecific（特定实现），Prefix（前缀匹配），Regular expression（正则表达式匹配）
#建立ingress控制器
[root@k8s-master ~]# kubectl apply -f timinglee-ingress.yml
ingress.networking.k8s.io/webserver created
[root@k8s-master ~]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
test-ingress nginx * 172.25.254.10 80 8m30s
[root@reg ~]# for n in {1..5}; do curl 172.25.254.50/hostname.html; done
timinglee-c56f584cf-8jhn6
timinglee-c56f584cf-8cwfm
timinglee-c56f584cf-8jhn6
timinglee-c56f584cf-8cwfm
timinglee-c56f584cf-8jhn6[!NOTE]
ingress必须和输出的service资源处于同一namespace
5.3 ingress 的高级用法
5.3.1 基于路径的访问
1.建立用于测试的控制器myapp
[root@k8s-master app]# kubectl create deployment myapp-v1 --image myapp:v1 --dry-run=client -o yaml > myapp-v1.yaml
[root@k8s-master app]# kubectl create deployment myapp-v2 --image myapp:v2 --dry-run=client -o yaml > myapp-v2.yaml
[root@k8s-master app]# vim myapp-v1.yaml
bash
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: myapp-v1
name: myapp-v1
spec:
replicas: 1
selector:
matchLabels:
app: myapp-v1
strategy: {}
template:
metadata:
labels:
app: myapp-v1
spec:
containers:
- image: myapp:v1
name: myapp
---
apiVersion: v1
kind: Service
metadata:
labels:
app: myapp-v1
name: myapp-v1
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: myapp-v1[root@k8s-master app]# vim myapp-v2.yaml
bash
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: myapp-v2
name: myapp-v2
spec:
replicas: 1
selector:
matchLabels:
app: myapp-v2
template:
metadata:
labels:
app: myapp-v2
spec:
containers:
- image: myapp:v2
name: myapp
---
apiVersion: v1
kind: Service
metadata:
labels:
app: myapp-v2
name: myapp-v2
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: myapp-v2[root@k8s-master app]# kubectl expose deployment myapp-v1 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v1.yaml
[root@k8s-master app]# kubectl expose deployment myapp-v2 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v1.yaml
[root@k8s-master app]# kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 29h
myapp-v1 ClusterIP 10.104.84.65 <none> 80/TCP 13s
myapp-v2 ClusterIP 10.105.246.219 <none> 80/TCP 7s2.建立ingress的yaml
[root@k8s-master app]# vim ingress1.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: / #访问路径后加任何内容都被定向到/
name: ingress1
spec:
ingressClassName: nginx
rules:
- host: www.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v1
port:
number: 80
path: /v1
pathType: Prefix
- backend:
service:
name: myapp-v2
port:
number: 80
path: /v2
pathType: Prefix#测试：
[root@reg ~]# echo 172.25.254.50 www.timinglee.org >> /etc/hosts
[root@reg ~]# curl www.timinglee.org/v1
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@reg ~]# curl www.timinglee.org/v2
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
#nginx.ingress.kubernetes.io/rewrite-target: / 的功能实现
[root@reg ~]# curl www.timinglee.org/v2/aaaa
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>5.3.2 基于域名的访问
#在测试主机中设定解析
[root@reg ~]# vim /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.25.254.250 reg.timinglee.org
172.25.254.50 www.timinglee.org myappv1.timinglee.org myappv2.timinglee.org
# 建立基于域名的yml文件
[root@k8s-master app]# vim ingress2.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
name: ingress2
spec:
ingressClassName: nginx
rules:
- host: myappv1.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v1
port:
number: 80
path: /
pathType: Prefix
- host: myappv2.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v2
port:
number: 80
path: /
pathType: Prefix
#利用文件建立ingress
[root@k8s-master app]# kubectl apply -f ingress2.yml
ingress.networking.k8s.io/ingress2 created
[root@k8s-master app]# kubectl describe ingress ingress2
Name: ingress2
Labels: <none>
Namespace: default
Address:
Ingress Class: nginx
Default backend: <default>
Rules:
Host Path Backends
---- ---- --------
myappv1.timinglee.org
/ myapp-v1:80 (10.244.2.31:80)
myappv2.timinglee.org
/ myapp-v2:80 (10.244.2.32:80)
Annotations: nginx.ingress.kubernetes.io/rewrite-target: /
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Sync 21s nginx-ingress-controller Scheduled for sync
#在测试主机中测试
[root@reg ~]# curl www.timinglee.org/v1
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@reg ~]# curl www.timinglee.org/v2
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>5.3.3 建立tls加密
#建立证书
[root@k8s-master app]# openssl req -newkey rsa:2048 -nodes -keyout tls.key -x509 -days 365 -subj "/CN=nginxsvc/O=nginxsvc" -out tls.crt#建立加密资源类型secret
[root@k8s-master app]# kubectl create secret tls web-tls-secret --key tls.key --cert tls.crt
secret/web-tls-secret created
[root@k8s-master app]# kubectl get secrets
NAME TYPE DATA AGE
web-tls-secret kubernetes.io/tls 2 6s[!NOTE]
secret通常在kubernetes中存放敏感数据，他并不是一种加密方式，在后面课程中会有专门讲解
#建立ingress3基于tls认证的yml文件
[root@k8s-master app]# vim ingress3.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
name: ingress3
spec:
tls:
- hosts:
- myapp-tls.timinglee.org
secretName: web-tls-secret
ingressClassName: nginx
rules:
- host: myapp-tls.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v1
port:
number: 80
path: /
pathType: Prefix
#测试
[root@reg ~]# curl -k https://myapp-tls.timinglee.org
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>5.3.4 建立auth认证
#建立认证文件
[root@k8s-master app]# dnf install httpd-tools -y
[root@k8s-master app]# htpasswd -cm auth lee
New password:
Re-type new password:
Adding password for user lee
[root@k8s-master app]# cat auth
lee:$apr1$BohBRkkI$hZzRDfpdtNzue98bFgcU10
#建立认证类型资源
[root@k8s-master app]# kubectl create secret generic auth-web --from-file auth
root@k8s-master app]# kubectl describe secrets auth-web
Name: auth-web
Namespace: default
Labels: <none>
Annotations: <none>
Type: Opaque
Data
====
auth: 42 bytes#建立ingress4基于用户认证的yaml文件
[root@k8s-master app]# vim ingress4.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/auth-type: basic
nginx.ingress.kubernetes.io/auth-secret: auth-web
nginx.ingress.kubernetes.io/auth-realm: "Please input username and password"
name: ingress4
spec:
tls:
- hosts:
- myapp-tls.timinglee.org
secretName: web-tls-secret
ingressClassName: nginx
rules:
- host: myapp-tls.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v1
port:
number: 80
path: /
pathType: Prefix#建立ingress4
[root@k8s-master app]# kubectl apply -f ingress4.yml
ingress.networking.k8s.io/ingress4 created
[root@k8s-master app]# kubectl describe ingress ingress4
Name: ingress4
Labels: <none>
Namespace: default
Address:
Ingress Class: nginx
Default backend: <default>
TLS:
web-tls-secret terminates myapp-tls.timinglee.org
Rules:
Host Path Backends
---- ---- --------
myapp-tls.timinglee.org
/ myapp-v1:80 (10.244.2.31:80)
Annotations: nginx.ingress.kubernetes.io/auth-realm: Please input username and password
nginx.ingress.kubernetes.io/auth-secret: auth-web
nginx.ingress.kubernetes.io/auth-type: basic
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Sync 14s nginx-ingress-controller Scheduled for sync
#测试：
[root@reg ~]# curl -k https://myapp-tls.timinglee.org
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@reg ~]# vim /etc/hosts ^C
[root@reg ~]# curl -k https://myapp-tls.timinglee.org
<html>
<head><title>401 Authorization Required</title></head>
<body>
<center><h1>401 Authorization Required</h1></center>
<hr><center>nginx</center>
</body>
</html>
[root@reg ~]# curl -k https://myapp-tls.timinglee.org -ulee:lee
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>5.3.5 rewrite重定向
#指定默认访问的文件到hostname.html上
[root@k8s-master app]# vim ingress5.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/app-root: /hostname.html
nginx.ingress.kubernetes.io/auth-type: basic
nginx.ingress.kubernetes.io/auth-secret: auth-web
nginx.ingress.kubernetes.io/auth-realm: "Please input username and password"
name: ingress5
spec:
tls:
- hosts:
- myapp-tls.timinglee.org
secretName: web-tls-secret
ingressClassName: nginx
rules:
- host: myapp-tls.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v1
port:
number: 80
path: /
pathType: Prefix[root@k8s-master app]# kubectl apply -f ingress5.yml
ingress.networking.k8s.io/ingress5 created
[root@k8s-master app]# kubectl describe ingress ingress5
Name: ingress5
Labels: <none>
Namespace: default
Address: 172.25.254.10
Ingress Class: nginx
Default backend: <default>
TLS:
web-tls-secret terminates myapp-tls.timinglee.org
Rules:
Host Path Backends
---- ---- --------
myapp-tls.timinglee.org
/ myapp-v1:80 (10.244.2.31:80)
Annotations: nginx.ingress.kubernetes.io/app-root: /hostname.html
nginx.ingress.kubernetes.io/auth-realm: Please input username and password
nginx.ingress.kubernetes.io/auth-secret: auth-web
nginx.ingress.kubernetes.io/auth-type: basic
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Sync 2m16s (x2 over 2m54s) nginx-ingress-controller Scheduled for sync
#测试：
[root@reg ~]# curl -Lk https://myapp-tls.timinglee.org -ulee:lee
myapp-v1-7479d6c54d-j9xc6
[root@reg ~]# curl -Lk https://myapp-tls.timinglee.org/lee/hostname.html -ulee:lee
<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.12.2</center>
</body>
</html>
#解决重定向路径问题
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
nginx.ingress.kubernetes.io/use-regex: "true"
nginx.ingress.kubernetes.io/auth-type: basic
nginx.ingress.kubernetes.io/auth-secret: auth-web
nginx.ingress.kubernetes.io/auth-realm: "Please input username and password"
name: ingress6
spec:
tls:
- hosts:
- myapp-tls.timinglee.org
secretName: web-tls-secret
ingressClassName: nginx
rules:
- host: myapp-tls.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v1
port:
number: 80
path: /
pathType: Prefix
- backend:
service:
name: myapp-v1
port:
number: 80
path: /lee(/|$)(.*) #正则表达式匹配/lee/，/lee/abc
pathType: ImplementationSpecific#测试
[root@reg ~]# curl -Lk https://myapp-tls.timinglee.org/lee/hostname.html -ulee:lee
myapp-v1-7479d6c54d-j9xc6六 Canary金丝雀发布
6.1 么是金丝雀发布
金丝雀发布（Canary Release）也称为灰度发布，是一种软件发布策略。
主要目的是在将新版本的软件全面推广到生产环境之前，先在一小部分用户或服务器上进行测试和验证，以降低因新版本引入重大问题而对整个系统造成的影响。
是一种Pod的发布方式。金丝雀发布采取先添加、再删除的方式，保证Pod的总量不低于期望值。并且在更新部分Pod后，暂停更新，当确认新Pod版本运行正常后再进行其他版本的Pod的更新。
6.2 Canary发布方式
其中header和weiht中的最多
6.2.1 基于header（http包头）灰度
-
通过Annotaion扩展
-
创建灰度ingress，配置灰度头部key以及value
-
灰度流量验证完毕后，切换正式ingress到新版本
-
之前我们在做升级时可以通过控制器做滚动更新，默认25%利用header可以使升级更为平滑，通过key 和vule 测试新的业务体系是否有问题。
示例：
#建立版本1的ingress
[root@k8s-master app]# vim ingress7.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
name: myapp-v1-ingress
spec:
ingressClassName: nginx
rules:
- host: myapp.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v1
port:
number: 80
path: /
pathType: Prefix
[root@k8s-master app]# kubectl describe ingress myapp-v1-ingress
Name: myapp-v1-ingress
Labels: <none>
Namespace: default
Address: 172.25.254.10
Ingress Class: nginx
Default backend: <default>
Rules:
Host Path Backends
---- ---- --------
myapp.timinglee.org
/ myapp-v1:80 (10.244.2.31:80)
Annotations: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Sync 44s (x2 over 73s) nginx-ingress-controller Scheduled for sync
#建立基于header的ingress
[root@k8s-master app]# vim ingress8.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/canary: "true"
nginx.ingress.kubernetes.io/canary-by-header: version
nginx.ingress.kubernetes.io/canary-by-header-value: 2
name: myapp-v2-ingress
spec:
ingressClassName: nginx
rules:
- host: myapp.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v2
port:
number: 80
path: /
pathType: Prefix[root@k8s-master app]# kubectl apply -f ingress8.yml
ingress.networking.k8s.io/myapp-v2-ingress created
[root@k8s-master app]# kubectl describe ingress myapp-v2-ingress
Name: myapp-v2-ingress
Labels: <none>
Namespace: default
Address:
Ingress Class: nginx
Default backend: <default>
Rules:
Host Path Backends
---- ---- --------
myapp.timinglee.org
/ myapp-v2:80 (10.244.2.32:80)
Annotations: nginx.ingress.kubernetes.io/canary: true
nginx.ingress.kubernetes.io/canary-by-header: version
nginx.ingress.kubernetes.io/canary-by-header-value: 2
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Sync 21s nginx-ingress-controller Scheduled for sync
#测试：
[root@reg ~]# curl myapp.timinglee.org
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@reg ~]# curl -H "version: 2" myapp.timinglee.org
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>6.2.2 基于权重的灰度发布
-
通过Annotaion拓展
-
创建灰度ingress，配置灰度权重以及总权重
-
灰度流量验证完毕后，切换正式ingress到新版本
示例
#基于权重的灰度发布
[root@k8s-master app]# vim ingress8.yml
bash
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/canary: "true"
nginx.ingress.kubernetes.io/canary-weight: "10" #更改权重值
nginx.ingress.kubernetes.io/canary-weight-total: "100"
name: myapp-v2-ingress
spec:
ingressClassName: nginx
rules:
- host: myapp.timinglee.org
http:
paths:
- backend:
service:
name: myapp-v2
port:
number: 80
path: /
pathType: Prefix[root@k8s-master app]# kubectl apply -f ingress8.yml
ingress.networking.k8s.io/myapp-v2-ingress created
#测试：
[root@reg ~]# vim check_ingress.sh
bash
#!/bin/bash
v1=0
v2=0
for (( i=0; i<100; i++))
do
response=`curl -s myapp.timinglee.org |grep -c v1`
v1=`expr $v1 + $response`
v2=`expr $v2 + 1 - $response`
done
echo "v1:$v1, v2:$v2"[root@reg ~]# sh check_ingress.sh
v1:90, v2:10
#更改完毕权重后继续测试可观察变化