kubernetes中的微服务

一什么是微服务

二微服务的类型

三 ipvs模式

3.1 ipvs模式配置方式

四微服务类型详解

4.1 clusterip

4.2 ClusterIP中的特殊模式headless

4.3 nodeport

4.4 loadbalancer

4.5 metalLB

4.6 externalname

五 Ingress-nginx

5.1 ingress-nginx功能

5.2 部署ingress

5.2.1 下载部署文件（资源已发）

5.2.2 安装ingress

5.2.3 测试ingress

5.3 ingress 的高级用法

5.3.1 基于路径的访问

5.3.2 基于域名的访问

5.3.3 建立tls加密

5.3.4 建立auth认证

5.3.5 rewrite重定向

六 Canary金丝雀发布

6.1 什么是金丝雀发布

6.2 Canary发布方式

6.2.1 基于header（http包头）灰度

6.2.2 基于权重的灰度发布

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

[root@k8s-master ~]# kubectl create deployment timinglee --image reg.timinglee.org/library/myapp:v1 --replicas 2 --dry-run=client -o yaml > timinglee.yaml

[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
timinglee-56f99b7f4b-4c9kc 1/1 Running 0 6s
timinglee-56f99b7f4b-9wlxl 1/1 Running 0 6s

#生成微服务yaml追加到已有yaml
[root@k8s-master ~]# kubectl expose deployment timinglee --port 80 --target-port 80 --dry-run=client -o yaml >> timinglee.yaml

[root@k8s-master ~]# vim timinglee.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: timinglee
name: timinglee
spec:
replicas: 2
selector:
matchLabels:
app: timinglee
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: timinglee
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp
resources: {}
status: {}

--- #不同资源间用---隔开
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: timinglee
name: timinglee
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
status:
loadBalancer: {}

[root@k8s-master ~]# kubectl delete deployments.apps timinglee
deployment.apps "timinglee" deleted
[root@k8s-master ~]# kubectl get pods
No resources found in default namespace.

[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
service/timinglee created

[root@k8s-master ~]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
timinglee ClusterIP 10.99.121.99 <none> 80/TCP

微服务默认使用iptables调度

[root@k8s-master ~]# kubectl get service -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d <none>
timinglee ClusterIP 10.99.121.99 <none> 80/TCP 89s app=timinglee   #集群内部IP   10.99.121.99

  #可以在火墙中查看到策略信息

[root@k8s-master ~]# iptables -t nat -nL

Chain KUBE-SVC-I7WXYK76FWYNTTGM (1 references)
target prot opt source destination
KUBE-MARK-MASQ tcp -- !10.244.0.0/16 10.99.121.99 /* 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-master/node/node2 ~]# yum install ipvsadm.x86_64 -y

2 修改master节点的代理配置

[root@k8s-master ~]# kubectl -n kube-system edit cm kube-proxy
configmap/kube-proxy edited

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)}'
pod "kube-proxy-22hr6" deleted
pod "kube-proxy-r4jj7" deleted
pod "kube-proxy-vwfgr" deleted

[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
-> 192.168.10.100:6443 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 10.99.121.99:80 rr
-> 10.244.1.3:80 Masq 1 0 0
-> 10.244.2.3:80 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
[root@k8s-master ~]#

注意：

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::ac84:aaff:fe44:17f3/64 scope link
valid_lft forever preferred_lft forever
8: kube-ipvs0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default
link/ether 9e:10:d2:0c:25:33 brd ff:ff:ff:ff:ff:ff
inet 10.96.0.1/32 scope global kube-ipvs0
valid_lft forever preferred_lft forever
inet 10.99.121.99/32 scope global kube-ipvs0
valid_lft forever preferred_lft forever
inet 10.96.0.10/32 scope global kube-ipvs0
valid_lft forever preferred_lft forever
[root@k8s-master ~]#

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@k8s-master ~]# 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

[root@k8s-master ~]# kubectl apply -f myapp.yml
service/timinglee created

[root@k8s-master ~]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
timinglee ClusterIP 10.110.19.199 <none> 80/TCP 16s

#service创建后集群DNS提供解析

[root@k8s-master ~]# kubectl -n kube-system get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 31d
[root@k8s-master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
timinglee ClusterIP 10.110.19.199 <none> 80/TCP 12m

[root@k8s-master ~]# dig timinglee.dedault.svc.cluster.local@10.96.0.10

; <<>> DiG 9.16.23-RH <<>> timinglee.dedault.svc.cluster.local@10.96.0.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 48678
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;timinglee.dedault.svc.cluster.local\@10.96.0.10. IN A

;; AUTHORITY SECTION:
. 3600 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024101500 1800 900 604800 86400

;; Query time: 1066 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Tue Oct 15 15:48:32 CST 2024
;; MSG SIZE rcvd: 139

4.2 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 ~]# kubectl delete -f myapp.yml
service "timinglee" deleted
[root@k8s-master ~]# vim myapp.yml
[root@k8s-master ~]# cat 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
clusterIP: None

[root@k8s-master ~]# kubectl apply -f myapp.yml
service/timinglee created

[root@k8s-master ~]# kubectl get service timinglee
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
timinglee ClusterIP None <none> 80/TCP 51s

[root@k8s-master ~]# dig timinglee.dedault.svc.cluster.local@10.96.0.10

; <<>> DiG 9.16.23-RH <<>> timinglee.dedault.svc.cluster.local@10.96.0.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 57288
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;timinglee.dedault.svc.cluster.local\@10.96.0.10. IN A

;; AUTHORITY SECTION:
. 3233 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024101500 1800 900 604800 86400

;; Query time: 27 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Tue Oct 15 15:54:39 CST 2024
;; MSG SIZE rcvd: 150

[root@k8s-master ~]# kubectl run test --image reg.timinglee.org/library/busyboxplus:latest -it
If you don't see a command prompt, try pressing enter.

/ # nslookup timinglee.default.svc.cluster.local.
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name: timinglee.default.svc.cluster.local.
Address 1: 10.96.132.41 timinglee.default.svc.cluster.local
/ # curl timinglee.default.svc.cluster.local.
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
/ # curl timinglee
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
/ # curl timinglee/hostname.html
timinglee-56f99b7f4b-fnqrp

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
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: timinglee
name: timinglee
spec:
replicas: 2
selector:
matchLabels:
app: timinglee
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: timinglee
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp
resources: {}
status: {}

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: timinglee
name: timinglee
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
type: NodePort
status:
loadBalancer: {}

[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
service/timinglee created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
timinglee-56f99b7f4b-blxbj 1/1 Running 0 5s
timinglee-56f99b7f4b-sbl2r 1/1 Running 0 5s
[root@k8s-master ~]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
timinglee NodePort 10.103.125.62 <none> 80:32494/TCP 15s
[root@k8s-master ~]# curl 192.168.10.100:32494
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@k8s-master ~]# curl 192.168.10.100:32494/hostname.html
timinglee-56f99b7f4b-sbl2r
[root@k8s-master ~]# curl 192.168.10.100:32494/hostname.html
timinglee-56f99b7f4b-blxbj

注意：

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: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: timinglee
name: timinglee
spec:
replicas: 2
selector:
matchLabels:
app: timinglee
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: timinglee
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: timinglee-service
name: timinglee-service
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
nodePort: 33333
selector:
app: timinglee
type: NodePort
status:
loadBalancer: {}

[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

注意：

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
......

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: timinglee-service
name: timinglee-service
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
type: LoadBalancer
status:
loadBalancer: {}
[root@k8s-master ~]# kubectl delete -f timinglee.yaml
deployment.apps "timinglee" deleted
service "timinglee-service" deleted
[root@k8s-master ~]# kubectl apply -f timinglee.yaml
deployment.apps/timinglee created
service/timinglee-service created
[root@k8s-master ~]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
timinglee-service LoadBalancer 10.111.37.137 <pending> 80:37927/TCP 12s

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
configmap/kube-proxy edited
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)}'
pod "kube-proxy-6785p" deleted
pod "kube-proxy-vmk8g" deleted
pod "kube-proxy-w4qgl" deleted

2.下载部署文件(资源已发)
[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 metallb]# docker load -i metalLB.tag.gz
f144bb4c7c7f: Loading layer 327.7kB/327.7kB
49626df344c9: Loading layer 40.96kB/40.96kB
945d17be9a3e: Loading layer 2.396MB/2.396MB
4d049f83d9cf: Loading layer 1.536kB/1.536kB
af5aa97ebe6c: Loading layer 2.56kB/2.56kB
ac805962e479: Loading layer 2.56kB/2.56kB
bbb6cacb8c82: Loading layer 2.56kB/2.56kB
2a92d6ac9e4f: Loading layer 1.536kB/1.536kB
1a73b54f556b: Loading layer 10.24kB/10.24kB
f4aee9e53c42: Loading layer 3.072kB/3.072kB
b336e209998f: Loading layer 238.6kB/238.6kB
371134a463a4: Loading layer 61.38MB/61.38MB
6e64357636e3: Loading layer 13.31kB/13.31kB
Loaded image: quay.io/metallb/controller:v0.14.8
0b8392a2e3be: Loading layer 2.137MB/2.137MB
3d5a6e3a17d1: Loading layer 65.46MB/65.46MB
8311c2bd52ed: Loading layer 49.76MB/49.76MB
4f4d43efeed6: Loading layer 3.584kB/3.584kB
881ed6f5069a: Loading layer 13.31kB/13.31kB
Loaded image: 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

5.部署服务

[root@k8s-master metallb]# kubectl apply -f metallb-native.yaml

[root@k8s-master metallb]# kubectl -n metallb-system get pods
NAME READY STATUS RESTARTS AGE
controller-584575df59-wblql 1/1 Running 0 29s
speaker-8xwvh 1/1 Running 0 29s
speaker-m845b 1/1 Running 0 29s
speaker-wrvh7 1/1 Running 0 29s

6.配置分配地址段

[root@k8s-master metallb]# vim configmap.yml
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
name: first-pool                #地址池名称
namespace: metallb-system
spec:
addresses:
- 192.168.10.10-192.168.10.200        #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 get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
timinglee-service LoadBalancer 10.105.122.155 192.168.10.50 80:36677/TCP 11s

#通过分配地址从集群外访问服务

[root@k8s-master ~]# curl 192.168.10.50
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
[root@k8s-master ~]# cat timinglee.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: timinglee
name: timinglee
spec:
replicas: 2
selector:
matchLabels:
app: timinglee
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: timinglee
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: timinglee-service
name: timinglee-service
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: timinglee
type: ExternalName
externalName: www.timinglee.org
status:
loadBalancer: {}

[root@k8s-master ~]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
timinglee-service ExternalName <none> www.timinglee.org 80/TCP 8s

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

#部署前准备工作

[root@k8s-master ~]# kubectl create deployment myappv1 --image reg.timinglee.org/library/myapp:v1 --dry-run=client -o yaml > myapp-v1.yml
[root@k8s-master ~]# cp myapp-v1.yml myapp-v2.yml
[root@k8s-master ~]# vim myapp-v2.yml
[root@k8s-master ~]# cat myapp-v1.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv1
name: myappv1
spec:
replicas: 1
selector:
matchLabels:
app: myappv1
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv1
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp
resources: {}
status: {}
[root@k8s-master ~]# cat myapp-v2.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv2
name: myappv2
spec:
replicas: 1
selector:
matchLabels:
app: myappv2
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv2
spec:
containers:
- image: reg.timinglee.org/library/myapp:v2
name: myapp2
resources: {}
status: {}
[root@k8s-master ~]# kubectl apply -f myapp-v1.yml
deployment.apps/myappv1 created
[root@k8s-master ~]# kubectl apply -f myapp-v2.yml
deployment.apps/myappv2 created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myappv1-78ff74589d-mqm6k 1/1 Running 0 11s
myappv2-68578565d8-swgzv 1/1 Running 0 6s

[root@k8s-master ~]# kubectl expose deployment myappv1 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v1.yml
[root@k8s-master ~]# kubectl expose deployment myappv2 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v2.yml

[root@k8s-master ~]# vim myapp-v1.yml
[root@k8s-master ~]# vim myapp-v2.yml
[root@k8s-master ~]# cat myapp-v1.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv1
name: myappv1
spec:
replicas: 1
selector:
matchLabels:
app: myappv1
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv1
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp
resources: {}
status: {}

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: myappv1
name: myappv1
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: myappv1
status:
loadBalancer: {}
[root@k8s-master ~]# cat myapp-v2.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv2
name: myappv2
spec:
replicas: 1
selector:
matchLabels:
app: myappv2
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv2
spec:
containers:
- image: reg.timinglee.org/library/myapp:v2
name: myapp2
resources: {}
status: {}

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: myappv2
name: myappv2
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: myappv2
status:
loadBalancer: {}
[root@k8s-master ~]# kubectl apply -f myapp-v1.yml
deployment.apps/myappv1 configured
service/myappv1 created
[root@k8s-master ~]# kubectl apply -f myapp-v2.yml
deployment.apps/myappv2 configured
service/myappv2 created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myappv1-78ff74589d-mqm6k 1/1 Running 0 4m59s
myappv2-68578565d8-swgzv 1/1 Running 0 4m54s

#测试

[root@k8s-master ~]# kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
myappv1 ClusterIP 10.100.212.4 <none> 80/TCP 45s
myappv2 ClusterIP 10.99.186.84 <none> 80/TCP 40s
[root@k8s-master ~]# curl 10.100.212.4
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@k8s-master ~]# curl 10.99.186.84
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>

5.2.1 下载部署文件（资源已发）

[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:v1.4.3

5.2.2 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 ingress]# kubectl apply -f deploy.yaml

[root@k8s-master ingress]# kubectl -n ingress-nginx get pods
NAME READY STATUS RESTARTS AGE
ingress-nginx-admission-create-xql2j 0/1 Completed 0 38s
ingress-nginx-admission-patch-46zhq 0/1 Completed 2 38s
ingress-nginx-controller-67bd6649b6-whdjw 1/1 Running 0 38s
[root@k8s-master ingress]#

[root@k8s-master ingress]# kubectl -n ingress-nginx get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller NodePort 10.96.34.154 <none> 80:38991/TCP,443:36893/TCP 63s
ingress-nginx-controller-admission ClusterIP 10.111.70.191 <none> 443/TCP 63s

#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 ingress]# kubectl -n ingress-nginx get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller LoadBalancer 10.96.34.154 <pending> 80:38991/TCP,443:36893/TCP 4m13s
ingress-nginx-controller-admission ClusterIP 10.111.70.191 <none> 443/TCP 4m13s

[root@k8s-master ingress]# kubectl -n ingress-nginx get all

NAME READY STATUS RESTARTS AGE
pod/ingress-nginx-admission-create-xql2j 0/1 Completed 0 28m
pod/ingress-nginx-admission-patch-46zhq 0/1 Completed 2 28m
pod/ingress-nginx-controller-67bd6649b6-whdjw 1/1 Running 0 28m

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/ingress-nginx-controller LoadBalancer 10.96.34.154 192.168.10.50 80:38991/TCP,443:36893/TCP 28m
service/ingress-nginx-controller-admission ClusterIP 10.111.70.191 <none> 443/TCP 28m

NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/ingress-nginx-controller 1/1 1 1 28m

NAME DESIRED CURRENT READY AGE
replicaset.apps/ingress-nginx-controller-67bd6649b6 1 1 1 28m

NAME STATUS COMPLETIONS DURATION AGE
job.batch/ingress-nginx-admission-create Complete 1/1 7s 28m
job.batch/ingress-nginx-admission-patch Complete 1/1 20s 28m
[root@k8s-master ingress]#

注意：

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 ingress]# kubectl create ingress webcluster --rule '*/=timinglee-svc:80' --dry-run=client -o yaml > timinglee-ingress.yml

[root@k8s-master ingress]# vim timinglee-ingress.yml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: test-ingress
spec:
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 ingress]# kubectl apply -f timinglee-ingress.yml
ingress.networking.k8s.io/test-ingress created

[root@k8s-master ingress]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
myappv1 nginx * 192.168.10.10 80 34s
[root@k8s-master ingress]# curl 192.168.10.50
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>

注意：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（上面已经做了，如果按照上面做了这个不用弄了）

[root@k8s-master ~]# kubectl create deployment myappv1 --image reg.timinglee.org/library/myapp:v1 --dry-run=client -o yaml > myapp-v1.yml
[root@k8s-master ~]# cp myapp-v1.yml myapp-v2.yml
[root@k8s-master ~]# vim myapp-v2.yml
[root@k8s-master ~]# cat myapp-v1.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv1
name: myappv1
spec:
replicas: 1
selector:
matchLabels:
app: myappv1
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv1
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp
resources: {}
status: {}
[root@k8s-master ~]# cat myapp-v2.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv2
name: myappv2
spec:
replicas: 1
selector:
matchLabels:
app: myappv2
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv2
spec:
containers:
- image: reg.timinglee.org/library/myapp:v2
name: myapp2
resources: {}
status: {}
[root@k8s-master ~]# kubectl apply -f myapp-v1.yml
deployment.apps/myappv1 created
[root@k8s-master ~]# kubectl apply -f myapp-v2.yml
deployment.apps/myappv2 created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myappv1-78ff74589d-mqm6k 1/1 Running 0 11s
myappv2-68578565d8-swgzv 1/1 Running 0 6s

[root@k8s-master ~]# kubectl expose deployment myappv1 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v1.yml
[root@k8s-master ~]# kubectl expose deployment myappv2 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v2.yml

[root@k8s-master ~]# vim myapp-v1.yml
[root@k8s-master ~]# vim myapp-v2.yml
[root@k8s-master ~]# cat myapp-v1.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv1
name: myappv1
spec:
replicas: 1
selector:
matchLabels:
app: myappv1
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv1
spec:
containers:
- image: reg.timinglee.org/library/myapp:v1
name: myapp
resources: {}
status: {}

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: myappv1
name: myappv1
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: myappv1
status:
loadBalancer: {}
[root@k8s-master ~]# cat myapp-v2.yml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: myappv2
name: myappv2
spec:
replicas: 1
selector:
matchLabels:
app: myappv2
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: myappv2
spec:
containers:
- image: reg.timinglee.org/library/myapp:v2
name: myapp2
resources: {}
status: {}

---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: myappv2
name: myappv2
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: myappv2
status:
loadBalancer: {}
[root@k8s-master ~]# kubectl apply -f myapp-v1.yml
deployment.apps/myappv1 configured
service/myappv1 created
[root@k8s-master ~]# kubectl apply -f myapp-v2.yml
deployment.apps/myappv2 configured
service/myappv2 created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myappv1-78ff74589d-mqm6k 1/1 Running 0 4m59s
myappv2-68578565d8-swgzv 1/1 Running 0 4m54s

[root@k8s-master ~]# kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 31d
myappv1 ClusterIP 10.100.212.4 <none> 80/TCP 45s
myappv2 ClusterIP 10.99.186.84 <none> 80/TCP 40s

2.建立ingress的yaml

[root@k8s-master ingress]# vim ingress.yml
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: myappv1
port:
number: 80
path: /v1
pathType: Prefix

- backend:
service:
name: myappv2
port:
number: 80
path: /v2
pathType: Prefix

#测试：

[root@k8s-master ingress]# kubectl apply -f ingress.yml
ingress.networking.k8s.io/ingress1 created

[root@k8s-master ingress]# echo 192.168.10.50 www.timinglee.org >> /etc/hosts
[root@k8s-master ingress]# curl www.timinglee.org/v1
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@k8s-master ingress]# 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@k8s-master ingress]# curl www.timinglee.org/v2/aaa
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
192.168.10.130 reg.timinglee.org
192.168.10.50 www.timinglee.org myappv1.timinglee.org myappv2.timinglee.org

# 建立基于域名的yml文件

[root@k8s-master ingress]# vim ingress2.yml
[root@k8s-master ingress]# cat ingress2.yml
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: myappv1
port:
number: 80
path: /
pathType: Prefix

- host: myappv2.timinglee.org
http:
paths:
- backend:
service:
name: myappv2
port:
number: 80
path: /
pathType: Prefix

#利用文件建立ingress

[root@k8s-master ingress]# kubectl apply -f ingress2.yml
ingress.networking.k8s.io/ingress2 created

[root@k8s-master ingress]# kubectl describe ingress ingress2
Name: ingress2
Labels: <none>
Namespace: default
Address: 192.168.10.10
Ingress Class: nginx
Default backend: <default>
Rules:
Host Path Backends
---- ---- --------
myappv1.timinglee.org
/ myappv1:80 (10.244.1.23:80)
myappv2.timinglee.org
/ myappv2:80 (10.244.2.20:80)
Annotations: nginx.ingress.kubernetes.io/rewrite-target: /
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Sync 30s (x2 over 66s) nginx-ingress-controller Scheduled for sync

#在测试主机中测试

[root@reg ~]# curl myappv1.timinglee.org
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@reg ~]# curl myappv2.timinglee.org
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 tls]# 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 tls]# ls
tls.crt tls.key
[root@k8s-master tls]# kubectl create secret tls web-tls-secret --key tls.key --cert tls.crt
secret/web-tls-secret created
[root@k8s-master tls]# kubectl get secrets
NAME TYPE DATA AGE
web-tls-secret kubernetes.io/tls 2 12s

注意：

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 tls]# vim ingress3.yml
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: myappv1
port:
number: 80
path: /
pathType: Prefix

[root@k8s-master tls]# vim /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.10.10   k8s-node
192.168.10.20   k8s-node2
192.168.10.100   k8s-master
192.168.10.130   reg.timinglee.org
192.168.10.50 www.timinglee.org myapp-tls.timinglee.org

[root@k8s-master tls]# kubectl apply -f ingress3.yml
ingress.networking.k8s.io/ingress3 created

#测试

[root@k8s-master tls]# curl -k https://myapp-tls.timinglee.org
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>