Table of Contents
- 1.1 HAproxy Ingress简介
- 1.2 HAproxy控制器安装
- 2.1 haproxy ingress基础
- 2.2 动态更新和负载均衡
- 2.3 基于名称虚拟主机
- 2.4 URL自动跳转
- 2.4 基于TLS加密
写在前面 #
前面文章介绍了基于nginx实现ingress controller的功能，本章节接续介绍kubernetes系列教程中另外一个姐妹开源负载均衡的控制器：haproxy ingress controller。
1. HAproxy Ingress控制器 #
1.1 HAproxy Ingress简介 #
HAProxy Ingress watches in the k8s cluster and how it builds HAProxy configuration
和Nginx相类似，HAproxy通过监视kubernetes api获取到service后端pod的状态，动态更新haproxy配置文件，以实现七层的负载均衡。
%E5%9F%BA%E4%BA%8Ehaproxy%E5%AE%9E%E7%8E%B0ingress%E6%9C%8D%E5%8A%A1%E6%9A%B4%E9%9C%B2/1%20-%201620.jpg)
HAproxy Ingress控制器具备的特性如下：
- Fast，Carefully built on top of the battle-tested HAProxy load balancer. 基于haproxy性能有保障
- Reliable，Trusted by sysadmins on clusters as big as 1,000 namespaces, 2,000 domains and 3,000 ingress objects. 可靠，支持1000最多1000个命名空间和2000多个域名
- Highly customizable，100+ configuration options and growing. 可定制化强，支持100多个配置选项
HAproxy ingress控制器版本
- 社区版，基于haproxy社区高度定制符合ingress的控制器，功能相对有限
- 企业版，haproxy企业版本，支持很多高级特性和功能，大部分高级功能在企业版本中实现
1.2 HAproxy控制器安装 #
haproxy ingress安装相对简单，官方提供了安装的yaml文件，先将文件下载查看一下kubernetes资源配置，包含的资源类型有：
- ServiceAccount 和RBAC认证授权关联
- RBAC认证 Role、ClusterRole、 ClusterRoleBinding
- Deployment 默认包含的一个后端backend应用服务器，与之关联一个Service
- Service 后端的一个service
- DaemonSet HAproxy最核心的一个控制器，关联认证ServiceAccount和配置ConfigMap，定义了一个nodeSelector，label为role: ingress-controller，将运行在特定的节点上
- ConfigMap 实现haproxy ingress自定义配置
安装文件路径https://haproxy-ingress.github.io/resources/haproxy-ingress.yaml
1、创建命名空间，haproxy ingress部署在ingress-controller这个命名空间，先创建ns
1[root@node-1 ~]# kubectl create namespace ingress-controller
2namespace/ingress-controller created
3
4[root@node-1 ~]# kubectl get namespaces ingress-controller -o yaml
5apiVersion: v1
6kind: Namespace
7metadata:
8 creationTimestamp: "2019-12-27T09:56:04Z"
9 name: ingress-controller
10 resourceVersion: "13946553"
11 selfLink: /api/v1/namespaces/ingress-controller
12 uid: ea70b2f7-efe4-43fd-8ce9-3b917b09b533
13spec:
14 finalizers:
15 - kubernetes
16status:
17 phase: Active
2、安装haproxy ingress控制器
1[root@node-1 ~]# wget https://haproxy-ingress.github.io/resources/haproxy-ingress.yaml
2[root@node-1 ~]# kubectl apply -f haproxy-ingress.yaml
3serviceaccount/ingress-controller created
4clusterrole.rbac.authorization.k8s.io/ingress-controller created
5role.rbac.authorization.k8s.io/ingress-controller created
6clusterrolebinding.rbac.authorization.k8s.io/ingress-controller created
7rolebinding.rbac.authorization.k8s.io/ingress-controller created
8deployment.apps/ingress-default-backend created
9service/ingress-default-backend created
10configmap/haproxy-ingress created
11daemonset.apps/haproxy-ingress created
3、 检查haproxy ingress安装情况，检查haproxy ingress核心的DaemonSets，发现DS并未部署Pod，原因是配置文件中定义了nodeSelector节点标签选择器，因此需要给node设置合理的标签
1[root@node-1 ~]# kubectl get daemonsets -n ingress-controller
2NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
3haproxy-ingress 0 0 0 0 0 role=ingress-controller 5m51s
4、 给node设置标签，让DaemonSets管理的Pod能调度到node节点上，生产环境中根据情况定义，将实现haproxy ingress功能的节点定义到特定的节点，对个node节点的访问，需要借助于负载均衡实现统一接入，本文主要以探究haproxy ingress功能，因此未部署负载均衡调度器，读者可根据实际的情况部署。以node-1和node-2为例：
1[root@node-1 ~]# kubectl label node node-1 role=ingress-controller
2node/node-1 labeled
3[root@node-1 ~]# kubectl label node node-2 role=ingress-controller
4node/node-2 labeled
5
6#查看labels的情况
7[root@node-1 ~]# kubectl get nodes --show-labels
8NAME STATUS ROLES AGE VERSION LABELS
9node-1 Ready master 104d v1.15.3 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node-1,kubernetes.io/os=linux,node-role.kubernetes.io/master=,role=ingress-controller
10node-2 Ready <none> 104d v1.15.3 app=web,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node-2,kubernetes.io/os=linux,label=test,role=ingress-controller
11node-3 Ready <none> 104d v1.15.3 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node-3,kubernetes.io/os=linux
5、再次查看ingress部署情况，已完成部署，并调度至node-1和node-2节点上
1[root@node-1 ~]# kubectl get daemonsets -n ingress-controller
2NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
3haproxy-ingress 2 2 2 2 2 role=ingress-controller 15m
4
5[root@node-1 ~]# kubectl get pods -n ingress-controller -o wide
6NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
7haproxy-ingress-bdns8 1/1 Running 0 2m27s 10.254.100.102 node-2 <none> <none>
8haproxy-ingress-d5rnl 1/1 Running 0 2m31s 10.254.100.101 node-1 <none> <none>
haproxy ingress部署时候也通过deployments部署了一个后端backend服务，这是部署haproxy ingress必须部署服务，否则ingress controller无法启动，可以通过查看Deployments列表确认
1[root@node-1 ~]# kubectl get deployments -n ingress-controller
2NAME READY UP-TO-DATE AVAILABLE AGE
3ingress-default-backend 1/1 1 1 18m
6、 查看haproxy ingress的日志，通过查询日志可知，多个haproxy ingress是通过选举实现高可用HA机制。
%E5%9F%BA%E4%BA%8Ehaproxy%E5%AE%9E%E7%8E%B0ingress%E6%9C%8D%E5%8A%A1%E6%9A%B4%E9%9C%B2/2%20-%201620.jpg)
其他资源包括ServiceAccount，ClusterRole，ConfigMaps请单独确认，至此HAproxy ingress controller部署完毕。另外两种部署方式：
2. haproxy ingress使用 #
2.1 haproxy ingress基础 #
Ingress控制器部署完毕后需要定义Ingress规则，以方便Ingress控制器能够识别到service后端Pod的资源，这个章节我们将来介绍在HAproxy Ingress Controller环境下Ingress的使用。
1、环境准备，创建一个deployments并暴露其端口
1#创建应用并暴露端口
2[root@node-1 haproxy-ingress]# kubectl run haproxy-ingress-demo --image=nginx:1.7.9 --port=80 --replicas=1 --expose
3kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
4service/haproxy-ingress-demo created
5deployment.apps/haproxy-ingress-demo created
6
7#查看应用
8[root@node-1 haproxy-ingress]# kubectl get deployments haproxy-ingress-demo
9NAME READY UP-TO-DATE AVAILABLE AGE
10haproxy-ingress-demo 1/1 1 1 10s
11
12#查看service情况
13[root@node-1 haproxy-ingress]# kubectl get services haproxy-ingress-demo
14NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
15haproxy-ingress-demo ClusterIP 10.106.199.102 <none> 80/TCP 17s
2、创建ingress规则,如果有多个ingress控制器，可以通过ingress.class指定类型为haproxy
1apiVersion: extensions/v1beta1
2kind: Ingress
3metadata:
4 name: haproxy-ingress-demo
5 labels:
6 ingresscontroller: haproxy
7 annotations:
8 kubernetes.io/ingress.class: haproxy
9spec:
10 rules:
11 - host: www.happylau.cn
12 http:
13 paths:
14 - path: /
15 backend:
16 serviceName: haproxy-ingress-demo
17 servicePort: 80
3、应用ingress规则，并查看ingress详情，查看Events日志发现控制器已正常更新
1[root@node-1 haproxy-ingress]# kubectl apply -f ingress-demo.yaml
2ingress.extensions/haproxy-ingress-demo created
3
4#查看详情
5[root@node-1 haproxy-ingress]# kubectl describe ingresses haproxy-ingress-demo
6Name: haproxy-ingress-demo
7Namespace: default
8Address:
9Default backend: default-http-backend:80 (<none>)
10Rules:
11 Host Path Backends
12 ---- ---- --------
13 www.happylau.cn
14 / haproxy-ingress-demo:80 (10.244.2.166:80)
15Annotations:
16 kubectl.kubernetes.io/last-applied-configuration: {"apiVersion":"extensions/v1beta1","kind":"Ingress","metadata":{"annotations":{"kubernetes.io/ingress.class":"haproxy"},"labels":{"ingresscontroller":"haproxy"},"name":"haproxy-ingress-demo","namespace":"default"},"spec":{"rules":[{"host":"www.happylau.cn","http":{"paths":[{"backend":{"serviceName":"haproxy-ingress-demo","servicePort":80},"path":"/"}]}}]}}
17
18 kubernetes.io/ingress.class: haproxy
19Events:
20 Type Reason Age From Message
21 ---- ------ ---- ---- -------
22 Normal CREATE 27s ingress-controller Ingress default/haproxy-ingress-demo
23 Normal CREATE 27s ingress-controller Ingress default/haproxy-ingress-demo
24 Normal UPDATE 20s ingress-controller Ingress default/haproxy-ingress-demo
25 Normal UPDATE 20s ingress-controller Ingress default/haproxy-ingress-demo
4、测试验证ingress规则，可以将域名写入到hosts文件中，我们直接使用gcurl测试，地址指向node-1或node-2均可
1[root@node-1 haproxy-ingress]# curl http://www.happylau.cn --resolve www.happylau.cn:80:10.254.100.101
2<!DOCTYPE html>
3<html>
4<head>
5<title>Welcome to nginx!</title>
6<style>
7 body {
8 width: 35em;
9 margin: 0 auto;
10 font-family: Tahoma, Verdana, Arial, sans-serif;
11 }
12</style>
13</head>
14<body>
15<h1>Welcome to nginx!</h1>
16<p>If you see this page, the nginx web server is successfully installed and
17working. Further configuration is required.</p>
18
19<p>For online documentation and support please refer to
20<a href="http://nginx.org/">nginx.org</a>.<br/>
21Commercial support is available at
22<a href="http://nginx.com/">nginx.com</a>.</p>
23
24<p><em>Thank you for using nginx.</em></p>
25</body>
26</html>
5、测试正常，接下来到haproxy ingress controller中刚查看对应生成规则配置文件
1[root@node-1 ~]# kubectl exec -it haproxy-ingress-bdns8 -n ingress-controller /bin/sh
2
3#查看配置文件
4/etc/haproxy # cat /etc/haproxy/haproxy.cfg
5 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
6# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
7# #
8# # HAProxy Ingress Controller
9# # --------------------------
10# # This file is automatically updated, do not edit
11# #
12# 全局配置文件内容
13global
14 daemon
15 nbthread 2
16 cpu-map auto:1/1-2 0-1
17 stats socket /var/run/haproxy-stats.sock level admin expose-fd listeners
18 maxconn 2000
19 hard-stop-after 10m
20 lua-load /usr/local/etc/haproxy/lua/send-response.lua
21 lua-load /usr/local/etc/haproxy/lua/auth-request.lua
22 tune.ssl.default-dh-param 2048
23 ssl-default-bind-ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK
24 ssl-default-bind-options no-sslv3 no-tls-tickets
25
26#默认配置内容
27defaults
28 log global
29 maxconn 2000
30 option redispatch
31 option dontlognull
32 option http-server-close
33 option http-keep-alive
34 timeout client 50s
35 timeout client-fin 50s
36 timeout connect 5s
37 timeout http-keep-alive 1m
38 timeout http-request 5s
39 timeout queue 5s
40 timeout server 50s
41 timeout server-fin 50s
42 timeout tunnel 1h
43
44#后端服务器，即通过service服务发现机制，和后端的Pod关联
45backend default_haproxy-ingress-demo_80
46 mode http
47 balance roundrobin
48 acl https-request ssl_fc
49 http-request set-header X-Original-Forwarded-For %[hdr(x-forwarded-for)] if { hdr(x-forwarded-for) -m found }
50 http-request del-header x-forwarded-for
51 option forwardfor
52 http-response set-header Strict-Transport-Security "max-age=15768000"
53 server srv001 10.244.2.166:80 weight 1 check inter 2s #后端Pod的地址
54 server srv002 127.0.0.1:1023 disabled weight 1 check inter 2s
55 server srv003 127.0.0.1:1023 disabled weight 1 check inter 2s
56 server srv004 127.0.0.1:1023 disabled weight 1 check inter 2s
57 server srv005 127.0.0.1:1023 disabled weight 1 check inter 2s
58 server srv006 127.0.0.1:1023 disabled weight 1 check inter 2s
59 server srv007 127.0.0.1:1023 disabled weight 1 check inter 2s
60
61#默认安装时创建的backend服务 ，初始安装时需要使用到
62backend _default_backend
63 mode http
64 balance roundrobin
65 http-request set-header X-Original-Forwarded-For %[hdr(x-forwarded-for)] if { hdr(x-forwarded-for) -m found }
66 http-request del-header x-forwarded-for
67 option forwardfor
68 server srv001 10.244.2.165:8080 weight 1 check inter 2s
69 server srv002 127.0.0.1:1023 disabled weight 1 check inter 2s
70 server srv003 127.0.0.1:1023 disabled weight 1 check inter 2s
71 server srv004 127.0.0.1:1023 disabled weight 1 check inter 2s
72 server srv005 127.0.0.1:1023 disabled weight 1 check inter 2s
73 server srv006 127.0.0.1:1023 disabled weight 1 check inter 2s
74 server srv007 127.0.0.1:1023 disabled weight 1 check inter 2s
75
76backend _error413
77 mode http
78 errorfile 400 /usr/local/etc/haproxy/errors/413.http
79 http-request deny deny_status 400
80backend _error495
81 mode http
82 errorfile 400 /usr/local/etc/haproxy/errors/495.http
83 http-request deny deny_status 400
84backend _error496
85 mode http
86 errorfile 400 /usr/local/etc/haproxy/errors/496.http
87 http-request deny deny_status 400
88
89#前端监听的80端口转发规则，并配置有https跳转，对应的主机配置在/etc/haproxy/maps/_global_http_front.map文件中定义
90frontend _front_http
91 mode http
92 bind *:80
93 http-request set-var(req.base) base,lower,regsub(:[0-9]+/,/)
94 http-request redirect scheme https if { var(req.base),map_beg(/etc/haproxy/maps/_global_https_redir.map,_nomatch) yes }
95 http-request set-header X-Forwarded-Proto http
96 http-request del-header X-SSL-Client-CN
97 http-request del-header X-SSL-Client-DN
98 http-request del-header X-SSL-Client-SHA1
99 http-request del-header X-SSL-Client-Cert
100 http-request set-var(req.backend) var(req.base),map_beg(/etc/haproxy/maps/_global_http_front.map,_nomatch)
101 use_backend %[var(req.backend)] unless { var(req.backend) _nomatch }
102 default_backend _default_backend
103
104#前端监听的443转发规则，对应域名在/etc/haproxy/maps/ _front001_host.map文件中
105frontend _front001
106 mode http
107 bind *:443 ssl alpn h2,http/1.1 crt /ingress-controller/ssl/default-fake-certificate.pem
108 http-request set-var(req.hostbackend) base,lower,regsub(:[0-9]+/,/),map_beg(/etc/haproxy/maps/_front001_host.map,_nomatch)
109 http-request set-header X-Forwarded-Proto https
110 http-request del-header X-SSL-Client-CN
111 http-request del-header X-SSL-Client-DN
112 http-request del-header X-SSL-Client-SHA1
113 http-request del-header X-SSL-Client-Cert
114 use_backend %[var(req.hostbackend)] unless { var(req.hostbackend) _nomatch }
115 default_backend _default_backend
116
117#状态监听器
118listen stats
119 mode http
120 bind *:1936
121 stats enable
122 stats uri /
123 no log
124 option forceclose
125 stats show-legends
126
127#监控健康检查
128frontend healthz
129 mode http
130 bind *:10253
131 monitor-uri /healthz
查看主机名隐射文件，包含有前端主机名和转发到后端backend的名称
1/etc/haproxy/maps # cat /etc/haproxy/maps/_global_http_front.map
2# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
3# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
4# #
5# # HAProxy Ingress Controller
6# # --------------------------
7# # This file is automatically updated, do not edit
8# #
9#
10www.happylau.cn/ default_haproxy-ingress-demo_80
通过上面的基础配置可以实现基于haproxy的七层负载均衡实现，haproxy ingress controller通过kubernetes api动态识别到service后端规则配置并更新至haproxy.cfg配置文件中，从而实现负载均衡功能实现。
2.2 动态更新和负载均衡 #
后端Pod是实时动态变化的，haproxy ingress通过service的服务发现机制，动态识别到后端Pod的变化情况，并动态更新haproxy.cfg配置文件，并重载配置（实际不需要重启haproxy服务），本章节将演示haproxy ingress动态更新和负载均衡功能。
1、动态更新，我们以扩容pod的副本为例，将副本数从replicas=1扩容至3个
1[root@node-1 ~]# kubectl scale --replicas=3 deployment haproxy-ingress-demo
2deployment.extensions/haproxy-ingress-demo scaled
3[root@node-1 ~]# kubectl get deployments haproxy-ingress-demo
4NAME READY UP-TO-DATE AVAILABLE AGE
5haproxy-ingress-demo 3/3 3 3 43m
6
7#查看扩容后Pod的IP地址
8[root@node-1 ~]# kubectl get pods -o wide
9NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
10haproxy-ingress-demo-5d487d4fc-5pgjt 1/1 Running 0 43m 10.244.2.166 node-3 <none> <none>
11haproxy-ingress-demo-5d487d4fc-pst2q 1/1 Running 0 18s 10.244.0.52 node-1 <none> <none>
12haproxy-ingress-demo-5d487d4fc-sr8tm 1/1 Running 0 18s 10.244.1.149 node-2 <none> <none>
2、查看haproxy配置文件内容,可以看到backend后端主机列表已动态发现新增的pod地址
1backend default_haproxy-ingress-demo_80
2 mode http
3 balance roundrobin
4 acl https-request ssl_fc
5 http-request set-header X-Original-Forwarded-For %[hdr(x-forwarded-for)] if { hdr(x-forwarded-for) -m found }
6 http-request del-header x-forwarded-for
7 option forwardfor
8 http-response set-header Strict-Transport-Security "max-age=15768000"
9 server srv001 10.244.2.166:80 weight 1 check inter 2s #新增的pod地址
10 server srv002 10.244.0.52:80 weight 1 check inter 2s
11 server srv003 10.244.1.149:80 weight 1 check inter 2s
12 server srv004 127.0.0.1:1023 disabled weight 1 check inter 2s
13 server srv005 127.0.0.1:1023 disabled weight 1 check inter 2s
14 server srv006 127.0.0.1:1023 disabled weight 1 check inter 2s
15 server srv007 127.0.0.1:1023 disabled weight 1 check inter 2s
4、查看haproxy ingress日志，日志中提示HAProxy updated without needing to reload，即配置动态识别，不需要重启haproxy服务就能够识别，自从1.8后haproxy能支持动态配置更新的能力，以适应微服务的场景，详情查看文章说明
1[root@node-1 ~]# kubectl logs haproxy-ingress-bdns8 -n ingress-controller -f
2I1227 12:21:11.523066 6 controller.go:274] Starting HAProxy update id=20
3I1227 12:21:11.561001 6 instance.go:162] HAProxy updated without needing to reload. Commands sent: 3
4I1227 12:21:11.561057 6 controller.go:325] Finish HAProxy update id=20: ingress=0.149764ms writeTmpl=37.738947ms total=37.888711ms
5、接下来测试负载均衡的功能，为了验证测试效果，往pod中写入不同的内容，以测试负载均衡的效果
1[root@node-1 ~]# kubectl exec -it haproxy-ingress-demo-5d487d4fc-5pgjt /bin/bash
2root@haproxy-ingress-demo-5d487d4fc-5pgjt:/# echo "web-1" > /usr/share/nginx/html/index.html
3
4[root@node-1 ~]# kubectl exec -it haproxy-ingress-demo-5d487d4fc-pst2q /bin/bash
5root@haproxy-ingress-demo-5d487d4fc-pst2q:/# echo "web-2" > /usr/share/nginx/html/index.html
6
7[root@node-1 ~]# kubectl exec -it haproxy-ingress-demo-5d487d4fc-sr8tm /bin/bash
8root@haproxy-ingress-demo-5d487d4fc-sr8tm:/# echo "web-3" > /usr/share/nginx/html/index.html
6、测试验证负载均衡效果,haproxy采用轮询的调度算法，因此可以明显看到轮询效果
1[root@node-1 ~]# curl http://www.happylau.cn --resolve www.happylau.cn:80:10.254.100.102
2web-1
3[root@node-1 ~]# curl http://www.happylau.cn --resolve www.happylau.cn:80:10.254.100.102
4web-2
5[root@node-1 ~]# curl http://www.happylau.cn --resolve www.happylau.cn:80:10.254.100.102
6web-3
这个章节验证了haproxy ingress控制器动态配置更新的能力，相比于nginx ingress控制器而言，haproxy ingress控制器不需要重载服务进程就能够动态识别到配置，在微服务场景下将具有非常大的优势；并通过一个实例验证了ingress负载均衡调度能力。
2.3 基于名称虚拟主机 #
这个小节将演示haproxy ingress基于虚拟云主机功能的实现，定义两个虚拟主机news.happylau.cn和sports.happylau.cn，将请求各自转发至haproxy-1和haproxy-2
1、 准备环境测试环境，创建两个应用haproxy-1和haproxy并暴露服务端口
1[root@node-1 ~]# kubectl run haproxy-1 --image=nginx:1.7.9 --port=80 --replicas=1 --expose=true
2[root@node-1 ~]# kubectl run haproxy-2 --image=nginx:1.7.9 --port=80 --replicas=1 --expose=true
3
4查看应用
5[root@node-1 ~]# kubectl get deployments
6NAME READY UP-TO-DATE AVAILABLE AGE
7haproxy-1 1/1 1 1 39s
8haproxy-2 1/1 1 1 36s
9
10查看service
11[root@node-1 ~]# kubectl get services
12NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
13haproxy-1 ClusterIP 10.100.239.114 <none> 80/TCP 55s
14haproxy-2 ClusterIP 10.100.245.28 <none> 80/TCP 52s
3、定义ingress规则，定义不同的主机并将请求转发至不同的service中
1apiVersion: extensions/v1beta1
2kind: Ingress
3metadata:
4 name: haproxy-ingress-virtualhost
5 annotations:
6 kubernetes.io/ingress.class: haproxy
7spec:
8 rules:
9 - host: news.happylau.cn
10 http:
11 paths:
12 - path: /
13 backend:
14 serviceName: haproxy-1
15 servicePort: 80
16 - host: sports.happylau.cn
17 http:
18 paths:
19 - path: /
20 backend:
21 serviceName: haproxy-2
22 servicePort: 80
23
24#应用ingress规则并查看列表
25[root@node-1 haproxy-ingress]# kubectl apply -f ingress-virtualhost.yaml
26ingress.extensions/haproxy-ingress-virtualhost created
27[root@node-1 haproxy-ingress]# kubectl get ingresses haproxy-ingress-virtualhost
28NAME HOSTS ADDRESS PORTS AGE
29haproxy-ingress-virtualhost news.happylau.cn,sports.happylau.cn 80 8s
30
31查看ingress规则详情
32[root@node-1 haproxy-ingress]# kubectl describe ingresses haproxy-ingress-virtualhost
33Name: haproxy-ingress-virtualhost
34Namespace: default
35Address:
36Default backend: default-http-backend:80 (<none>)
37Rules:
38 Host Path Backends
39 ---- ---- --------
40 news.happylau.cn
41 / haproxy-1:80 (10.244.2.168:80)
42 sports.happylau.cn
43 / haproxy-2:80 (10.244.2.169:80)
44Annotations:
45 kubectl.kubernetes.io/last-applied-configuration: {"apiVersion":"extensions/v1beta1","kind":"Ingress","metadata":{"annotations":{"kubernetes.io/ingress.class":"haproxy"},"name":"haproxy-ingress-virtualhost","namespace":"default"},"spec":{"rules":[{"host":"news.happylau.cn","http":{"paths":[{"backend":{"serviceName":"haproxy-1","servicePort":80},"path":"/"}]}},{"host":"sports.happylau.cn","http":{"paths":[{"backend":{"serviceName":"haproxy-2","servicePort":80},"path":"/"}]}}]}}
46
47 kubernetes.io/ingress.class: haproxy
48Events:
49 Type Reason Age From Message
50 ---- ------ ---- ---- -------
51 Normal CREATE 37s ingress-controller Ingress default/haproxy-ingress-virtualhost
52 Normal CREATE 37s ingress-controller Ingress default/haproxy-ingress-virtualhost
53 Normal UPDATE 20s ingress-controller Ingress default/haproxy-ingress-virtualhost
54 Normal UPDATE 20s ingress-controller Ingress default/haproxy-ingress-virtualhost
4、测试验证虚拟机主机配置，通过curl直接解析的方式，或者通过写hosts文件
%E5%9F%BA%E4%BA%8Ehaproxy%E5%AE%9E%E7%8E%B0ingress%E6%9C%8D%E5%8A%A1%E6%9A%B4%E9%9C%B2/3%20-%201620.jpg)
5、查看配置配置文件内容，配置中更新了haproxy.cfg的front段和backend段的内容
1/etc/haproxy/haproxy.cfg 配置文件内容
2backend default_haproxy-1_80 #haproxy-1后端
3 mode http
4 balance roundrobin
5 acl https-request ssl_fc
6 http-request set-header X-Original-Forwarded-For %[hdr(x-forwarded-for)] if { hdr(x-forwarded-for) -m found }
7 http-request del-header x-forwarded-for
8 option forwardfor
9 http-response set-header Strict-Transport-Security "max-age=15768000"
10 server srv001 10.244.2.168:80 weight 1 check inter 2s
11 server srv002 127.0.0.1:1023 disabled weight 1 check inter 2s
12 server srv003 127.0.0.1:1023 disabled weight 1 check inter 2s
13 server srv004 127.0.0.1:1023 disabled weight 1 check inter 2s
14 server srv005 127.0.0.1:1023 disabled weight 1 check inter 2s
15 server srv006 127.0.0.1:1023 disabled weight 1 check inter 2s
16 server srv007 127.0.0.1:1023 disabled weight 1 check inter 2s
17
18#haproxy-2后端
19backend default_haproxy-2_80
20 mode http
21 balance roundrobin
22 acl https-request ssl_fc
23 http-request set-header X-Original-Forwarded-For %[hdr(x-forwarded-for)] if { hdr(x-forwarded-for) -m found }
24 http-request del-header x-forwarded-for
25 option forwardfor
26 http-response set-header Strict-Transport-Security "max-age=15768000"
27 server srv001 10.244.2.169:80 weight 1 check inter 2s
28 server srv002 127.0.0.1:1023 disabled weight 1 check inter 2s
29 server srv003 127.0.0.1:1023 disabled weight 1 check inter 2s
30 server srv004 127.0.0.1:1023 disabled weight 1 check inter 2s
31 server srv005 127.0.0.1:1023 disabled weight 1 check inter 2s
32 server srv006 127.0.0.1:1023 disabled weight 1 check inter 2s
33 server srv007 127.0.0.1:1023 disabled weight 1 check inter 2s
34
35配置关联内容
36/ # cat /etc/haproxy/maps/_global_http_front.map
37# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
38# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
39# #
40# # HAProxy Ingress Controller
41# # --------------------------
42# # This file is automatically updated, do not edit
43# #
44#
45news.happylau.cn/ default_haproxy-1_80
46sports.happylau.cn/ default_haproxy-2_80
2.4 URL自动跳转 #
haproxy ingress支持自动跳转的能力，需要通过annotations定义，通过ingress.kubernetes.io/ssl-redirect设置即可，默认为false，设置为true即可实现http往https跳转的能力，当然可以将配置写入到ConfigMap中实现默认跳转的能力，本文以编写annotations为例，实现访问http跳转https的能力。
1、定义ingress规则，设置ingress.kubernetes.io/ssl-redirect实现跳转功能
1apiVersion: extensions/v1beta1
2kind: Ingress
3metadata:
4 name: haproxy-ingress-virtualhost
5 annotations:
6 kubernetes.io/ingress.class: haproxy
7 ingress.kubernetes.io/ssl-redirect: true #实现跳转功能
8spec:
9 rules:
10 - host: news.happylau.cn
11 http:
12 paths:
13 - path: /
14 backend:
15 serviceName: haproxy-1
16 servicePort: 80
17 - host: sports.happylau.cn
18 http:
19 paths:
20 - path: /
21 backend:
22 serviceName: haproxy-2
23 servicePort: 80
按照上图测试了一下功能，未能实现跳转实现跳转的功能，开源版本中未能找到更多文档说明，企业版由于镜像需要认证授权下载，未能进一步做测试验证。
2.4 基于TLS加密 #
haproxy ingress默认集成了一个
1、生成自签名证书和私钥
1[root@node-1 haproxy-ingress]# openssl req -x509 -newkey rsa:2048 -nodes -days 365 -keyout tls.key -out tls.crt
2Generating a 2048 bit RSA private key
3...........+++
4.......+++
5writing new private key to 'tls.key'
6-----
7You are about to be asked to enter information that will be incorporated
8into your certificate request.
9What you are about to enter is what is called a Distinguished Name or a DN.
10There are quite a few fields but you can leave some blank
11For some fields there will be a default value,
12If you enter '.', the field will be left blank.
13-----
14Country Name (2 letter code) [XX]:CN
15State or Province Name (full name) []:GD
16Locality Name (eg, city) [Default City]:ShenZhen
17Organization Name (eg, company) [Default Company Ltd]:Tencent
18Organizational Unit Name (eg, section) []:HappyLau
19Common Name (eg, your name or your server's hostname) []:www.happylau.cn
20Email Address []:573302346@qq.com
2、创建Secrets，关联证书和私钥
1[root@node-1 haproxy-ingress]# kubectl create secret tls haproxy-tls --cert=tls.crt --key=tls.key
2secret/haproxy-tls created
3
4[root@node-1 haproxy-ingress]# kubectl describe secrets haproxy-tls
5Name: haproxy-tls
6Namespace: default
7Labels: <none>
8Annotations: <none>
9
10Type: kubernetes.io/tls
11
12Data
13====
14tls.crt: 1424 bytes
15tls.key: 1704 bytes
3、编写ingress规则，通过tls关联Secrets
1apiVersion: extensions/v1beta1
2kind: Ingress
3metadata:
4 name: haproxy-ingress-virtualhost
5 annotations:
6 kubernetes.io/ingress.class: haproxy
7spec:
8 tls:
9 - hosts:
10 - news.happylau.cn
11 - sports.happylau.cn
12 secretName: haproxy-tls
13 rules:
14 - host: news.happylau.cn
15 http:
16 paths:
17 - path: /
18 backend:
19 serviceName: haproxy-1
20 servicePort: 80
21 - host: sports.happylau.cn
22 http:
23 paths:
24 - path: /
25 backend:
26 serviceName: haproxy-2
27 servicePort: 80
4、应用配置并查看详情,在TLS中可以看到TLS关联的证书
1[root@node-1 haproxy-ingress]# kubectl apply -f ingress-virtualhost.yaml
2ingress.extensions/haproxy-ingress-virtualhost configured
3
4[root@node-1 haproxy-ingress]# kubectl describe ingresses haproxy-ingress-virtualhost
5Name: haproxy-ingress-virtualhost
6Namespace: default
7Address:
8Default backend: default-http-backend:80 (<none>)
9TLS:
10 haproxy-tls terminates news.happylau.cn,sports.happylau.cn
11Rules:
12 Host Path Backends
13 ---- ---- --------
14 news.happylau.cn
15 / haproxy-1:80 (10.244.2.168:80)
16 sports.happylau.cn
17 / haproxy-2:80 (10.244.2.169:80)
18Annotations:
19 kubectl.kubernetes.io/last-applied-configuration: {"apiVersion":"extensions/v1beta1","kind":"Ingress","metadata":{"annotations":{"kubernetes.io/ingress.class":"haproxy"},"name":"haproxy-ingress-virtualhost","namespace":"default"},"spec":{"rules":[{"host":"news.happylau.cn","http":{"paths":[{"backend":{"serviceName":"haproxy-1","servicePort":80},"path":"/"}]}},{"host":"sports.happylau.cn","http":{"paths":[{"backend":{"serviceName":"haproxy-2","servicePort":80},"path":"/"}]}}],"tls":[{"hosts":["news.happylau.cn","sports.happylau.cn"],"secretName":"haproxy-tls"}]}}
20
21 kubernetes.io/ingress.class: haproxy
22Events:
23 Type Reason Age From Message
24 ---- ------ ---- ---- -------
25 Normal CREATE 37m ingress-controller Ingress default/haproxy-ingress-virtualhost
26 Normal CREATE 37m ingress-controller Ingress default/haproxy-ingress-virtualhost
27 Normal UPDATE 7s (x2 over 37m) ingress-controller Ingress default/haproxy-ingress-virtualhost
28 Normal UPDATE 7s (x2 over 37m) ingress-controller Ingress default/haproxy-ingress-virtualhost
5、测试https站点访问，可以看到安全的https访问
%E5%9F%BA%E4%BA%8Ehaproxy%E5%AE%9E%E7%8E%B0ingress%E6%9C%8D%E5%8A%A1%E6%9A%B4%E9%9C%B2/4%20-%201620.jpg)
写在最后 #
haproxy实现ingress实际是通过配置更新haproxy.cfg配置，结合service的服务发现机制动态完成ingress接入，相比于nginx来说，haproxy不需要重载实现配置变更。在测试haproxy ingress过程中，有部分功能配置验证没有达到预期，更丰富的功能支持在haproxy ingress企业版中支持，社区版能支持蓝绿发布和WAF安全扫描功能，详情可以参考社区文档haproxy蓝绿发布和WAF安全支持。
haproxy ingress控制器目前在社区活跃度一般，相比于nginx，traefik，istio还有一定的差距，实际环境中不建议使用社区版的haproxy ingress。
参考文档 #
官方安装文档：https://haproxy-ingress.github.io/docs/getting-started/
haproxy ingress官方配置：https://www.haproxy.com/documentation/hapee/1-7r2/traffic-management/k8s-image-controller/
当你的才华撑不起你的野心时，你就应该静下心来学习
返回kubernetes系列教程目录
如果觉得文章对您有帮助，请订阅专栏，分享给有需要的朋友吧😊
关于作者 刘海平（HappyLau ）云计算高级顾问 目前在腾讯云从事公有云相关工作，曾就职于酷狗，EasyStack，拥有多年公有云+私有云计算架构设计，运维，交付相关经验，参与了酷狗，南方电网，国泰君安等大型私有云平台建设，精通Linux，Kubernetes，OpenStack，Ceph等开源技术，在云计算领域具有丰富实战经验，拥有RHCA/OpenStack/Linux授课经验。
附录 #
1#RBAC认证账号，和角色关联
2apiVersion: v1
3kind: ServiceAccount
4metadata:
5 name: ingress-controller
6 namespace: ingress-controller
7---
8# 集群角色，访问资源对象和具体访问权限
9apiVersion: rbac.authorization.k8s.io/v1beta1
10kind: ClusterRole
11metadata:
12 name: ingress-controller
13rules:
14 - apiGroups:
15 - ""
16 resources:
17 - configmaps
18 - endpoints
19 - nodes
20 - pods
21 - secrets
22 verbs:
23 - list
24 - watch
25 - apiGroups:
26 - ""
27 resources:
28 - nodes
29 verbs:
30 - get
31 - apiGroups:
32 - ""
33 resources:
34 - services
35 verbs:
36 - get
37 - list
38 - watch
39 - apiGroups:
40 - "extensions"
41 resources:
42 - ingresses
43 verbs:
44 - get
45 - list
46 - watch
47 - apiGroups:
48 - ""
49 resources:
50 - events
51 verbs:
52 - create
53 - patch
54 - apiGroups:
55 - "extensions"
56 resources:
57 - ingresses/status
58 verbs:
59 - update
60
61---
62#角色定义
63apiVersion: rbac.authorization.k8s.io/v1beta1
64kind: Role
65metadata:
66 name: ingress-controller
67 namespace: ingress-controller
68rules:
69 - apiGroups:
70 - ""
71 resources:
72 - configmaps
73 - pods
74 - secrets
75 - namespaces
76 verbs:
77 - get
78 - apiGroups:
79 - ""
80 resources:
81 - configmaps
82 verbs:
83 - get
84 - update
85 - apiGroups:
86 - ""
87 resources:
88 - configmaps
89 verbs:
90 - create
91 - apiGroups:
92 - ""
93 resources:
94 - endpoints
95 verbs:
96 - get
97 - create
98 - update
99
100---
101#集群角色绑定ServiceAccount和ClusterRole关联
102apiVersion: rbac.authorization.k8s.io/v1beta1
103kind: ClusterRoleBinding
104metadata:
105 name: ingress-controller
106roleRef:
107 apiGroup: rbac.authorization.k8s.io
108 kind: ClusterRole
109 name: ingress-controller
110subjects:
111 - kind: ServiceAccount
112 name: ingress-controller
113 namespace: ingress-controller
114 - apiGroup: rbac.authorization.k8s.io
115 kind: User
116 name: ingress-controller
117
118---
119#角色绑定
120apiVersion: rbac.authorization.k8s.io/v1beta1
121kind: RoleBinding
122metadata:
123 name: ingress-controller
124 namespace: ingress-controller
125roleRef:
126 apiGroup: rbac.authorization.k8s.io
127 kind: Role
128 name: ingress-controller
129subjects:
130 - kind: ServiceAccount
131 name: ingress-controller
132 namespace: ingress-controller
133 - apiGroup: rbac.authorization.k8s.io
134 kind: User
135 name: ingress-controller
136
137---
138#后端服务应用，haproxy ingress默认需要一个关联的应用
139apiVersion: apps/v1
140kind: Deployment
141metadata:
142 labels:
143 run: ingress-default-backend
144 name: ingress-default-backend
145 namespace: ingress-controller
146spec:
147 selector:
148 matchLabels:
149 run: ingress-default-backend
150 template:
151 metadata:
152 labels:
153 run: ingress-default-backend
154 spec:
155 containers:
156 - name: ingress-default-backend
157 image: gcr.io/google_containers/defaultbackend:1.0
158 ports:
159 - containerPort: 8080
160 resources:
161 limits:
162 cpu: 10m
163 memory: 20Mi
164
165---
166#后端应用的service定义
167apiVersion: v1
168kind: Service
169metadata:
170 name: ingress-default-backend
171 namespace: ingress-controller
172spec:
173 ports:
174 - port: 8080
175 selector:
176 run: ingress-default-backend
177
178---
179#haproxy ingress配置，实现自定义配置功能
180apiVersion: v1
181kind: ConfigMap
182metadata:
183 name: haproxy-ingress
184 namespace: ingress-controller
185
186---
187#haproxy ingress核心的DaemonSet
188apiVersion: apps/v1
189kind: DaemonSet
190metadata:
191 labels:
192 run: haproxy-ingress
193 name: haproxy-ingress
194 namespace: ingress-controller
195spec:
196 updateStrategy:
197 type: RollingUpdate
198 selector:
199 matchLabels:
200 run: haproxy-ingress
201 template:
202 metadata:
203 labels:
204 run: haproxy-ingress
205 spec:
206 hostNetwork: true #网络模式为hostNetwork,即使用宿主机的网络
207 nodeSelector: #节点选择器，将调度至包含特定标签的节点
208 role: ingress-controller
209 serviceAccountName: ingress-controller #实现RBAC认证授权
210 containers:
211 - name: haproxy-ingress
212 image: quay.io/jcmoraisjr/haproxy-ingress
213 args:
214 - --default-backend-service=$(POD_NAMESPACE)/ingress-default-backend
215 - --configmap=$(POD_NAMESPACE)/haproxy-ingress
216 - --sort-backends
217 ports:
218 - name: http
219 containerPort: 80
220 - name: https
221 containerPort: 443
222 - name: stat
223 containerPort: 1936
224 livenessProbe:
225 httpGet:
226 path: /healthz
227 port: 10253
228 env:
229 - name: POD_NAME
230 valueFrom:
231 fieldRef:
232 fieldPath: metadata.name
233 - name: POD_NAMESPACE
234 valueFrom:
235 fieldRef:
236 fieldPath: metadata.namespace
『 转载 』该文章来源于网络，侵删。