kubernetes进阶(四)服务暴露-ingress控制器之traefik
...大约 3 分钟
kubernetes进阶(四)服务暴露-ingress控制器之traefik
上一章我们测试了在集群内部解析service名称,
下面我们测试在集群外部解析:
![img](/assets/1034759-20191123175410495-632059730-16918406651821-zxJIbfm2.png)
根本解析不到,因为我们外部用的dns是10.4.7.11,也就是我们的自建bind dns,这个DNS服务器上也没有响应的搜索域。
如何能让集群外部访问nginx-dp?
这里有两种服务暴露方式:修改工作模式,在kube-proxy中修改,并重启
1、使用nodeport方式,但是这种方式不能使用ipvs,只能使用iptables,iptables只能使用rr调度方式。原理相当于端口映射,将容器内的端口映射到宿主机上的某个端口。
2、使用ingress,但是只能工作在七层网络下,建议暴露http, https可以使用前端nginx来做证书方面的卸载 ---推荐使用
Ingress是基于域名和URL路径,将用户的请求转发至特定的service资源。
下面我们部署traefik:GITHUB官方地址 在hdss7-200上执行:
下载镜像:
# docker pull traefik:v1.7.2-alpine
# docker tag add5fac61ae5 harbor.od.com/public/traefik:v1.7.2
# docker push harbor.od.com/public/traefik:v1.7.
创建资源配置清单:
1.rbac.yaml
# cd /data/k8s-yaml/traefik/
# vi rbac.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: traefik-ingress-controller
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
name: traefik-ingress-controller
rules:
- apiGroups:
- ""
resources:
- services
- endpoints
- secrets
verbs:
- get
- list
- watch
- apiGroups:
- extensions
resources:
- ingresses
verbs:
- get
- list
- watch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: traefik-ingress-controller
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: traefik-ingress-controller
subjects:
- kind: ServiceAccount
name: traefik-ingress-controller
namespace: kube-system
2.ds.yaml
# vi ds.yaml
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
name: traefik-ingress
namespace: kube-system
labels:
k8s-app: traefik-ingress
spec:
template:
metadata:
labels:
k8s-app: traefik-ingress
name: traefik-ingress
spec:
serviceAccountName: traefik-ingress-controller
terminationGracePeriodSeconds: 60
containers:
- image: harbor.od.com/public/traefik:v1.7.2
name: traefik-ingress
ports:
- name: controller
containerPort: 80
hostPort: 81
- name: admin-web
containerPort: 8080
securityContext:
capabilities:
drop:
- ALL
add:
- NET_BIND_SERVICE
args:
- --api
- --kubernetes
- --logLevel=INFO
- --insecureskipverify=true
- --kubernetes.endpoint=https://10.4.7.10:7443
- --accesslog
- --accesslog.filepath=/var/log/traefik_access.log
- --traefiklog
- --traefiklog.filepath=/var/log/traefik.log
- --metrics.prometheus
3.svc.yaml
# vi svc.yaml
kind: Service
apiVersion: v1
metadata:
name: traefik-ingress-service
namespace: kube-system
spec:
selector:
k8s-app: traefik-ingress
ports:
- protocol: TCP
port: 80
name: controller
- protocol: TCP
port: 8080
name: admin-web
4.ingress.yaml
# vi ingress.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: traefik-web-ui
namespace: kube-system
annotations:
kubernetes.io/ingress.class: traefik
spec:
rules:
- host: traefik.od.com
http:
paths:
- path: /
backend:
serviceName: traefik-ingress-service
servicePort: 8080
然后到node节点上创建资源:
# kubectl create -f http://k8s-yaml.od.com/traefik/rbac.yaml
# kubectl create -f http://k8s-yaml.od.com/traefik/ds.yaml
# kubectl create -f http://k8s-yaml.od.com/traefik/svc.yaml
# kubectl create -f http://k8s-yaml.od.com/traefik/ingress.yaml
配置nginx解析:hdss7-11,hdss7-12
# vi /etc/nginx/conf.d/od.com.conf
upstream default_backend_traefik {
server 10.4.7.21:81 max_fails=3 fail_timeout=10s;
server 10.4.7.22:81 max_fails=3 fail_timeout=10s;
}
server {
server_name *.od.com;
location / {
proxy_pass http://default_backend_traefik;
proxy_set_header Host $http_host;
proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
}
}
在hdss7-11上添加域名解析:在ingress.yaml中的host值:
# vi /var/named/od.com.zone
在最后加上traefik的域名解析:
$ORIGIN od.com.
$TTL 600 ; 10 minutes
@ IN SOA dns.od.com. dnsadmin.od.com. (
2019061804 ; serial
10800 ; refresh (3 hours)
900 ; retry (15 minutes)
604800 ; expire (1 week)
86400 ; minimum (1 day)
)
NS dns.od.com.
$TTL 60 ; 1 minute
dns A 10.4.7.11
harbor A 10.4.7.200
k8s-yaml A 10.4.7.200
traefik A 10.4.7.10
# systemctl restart named
然后我们就可以在集群外,通过浏览器访问这个域名了:
http://traefik.od.com #我们的宿主机的虚拟网卡指定了bind域名解析服务器
![img](/assets/1034759-20191123195126520-796246549-16918406692903-C-jYa0mg.png)
分类: [Kubernetes](https://www.cnblogs.com/slim-liu/category/1588426.html)