kubernetes 1.11.2整理Ⅲ

内容简介：创建testnginx deployment官方地址修改配置文件中的部分配置：

测试集群

# 创建一个 nginx deplyment

apiVersion: extensions/v1beta1 
kind: Deployment 
metadata: 
  name: nginx-dm
spec: 
  replicas: 2
  template: 
    metadata: 
      labels: 
        name: nginx 
    spec: 
      containers: 
        - name: nginx 
          image: nginx:alpine 
          imagePullPolicy: IfNotPresent
          ports: 
            - containerPort: 80
            
---

apiVersion: v1 
kind: Service
metadata: 
  name: nginx-svc 
spec: 
  ports: 
    - port: 80
      targetPort: 80
      protocol: TCP 
  selector: 
    name: nginx

创建testnginx deployment

[root@master1 ~]# kubectl create -f testnginx.yaml
deployment.extensions/nginx-dm created
service/nginx-svc created

[root@master1 ~]# kubectl get po -o wide
NAME                       READY     STATUS              RESTARTS   AGE       IP               NODE      NOMINATED NODE
nginx-dm-fff68d674-j7dlk   1/1       Running             0          9m        10.254.108.115   node2     <none>
nginx-dm-fff68d674-r5hb6   1/1       Running             0          9m        10.254.102.133   node1     <none>

在安装了 calico 网络的node节点里 curl

[root@node2 ~]# curl 10.254.102.133
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

查看 ipvs 规则

[root@node2 ssl]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.254.0.1:443 rr
  -> 192.168.161.161:6443         Masq    1      1          0
  -> 192.168.161.162:6443         Masq    1      0          0
TCP  10.254.18.37:80 rr
  -> 10.254.75.1:80               Masq    1      0          0
  -> 10.254.102.133:80            Masq    1      0          0

配置 CoreDNS

官方地址 https://coredns.io

下载 yaml 文件

wget https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/coredns.yaml.sed

mv coredns.yaml.sed coredns.yaml

修改配置文件中的部分配置：

# vi coredns.yaml

第一处：
...
data:
  Corefile: |
    .:53 {
        errors
        health
        kubernetes cluster.local 10.254.0.0/18 {
          pods insecure
          upstream
          fallthrough in-addr.arpa ip6.arpa
        }
        prometheus :9153
        proxy . /etc/resolv.conf
        cache 30
    }
...       

第二处：搜索 /clusterIP 即可
  clusterIP: 10.254.0.2

配置说明

1）errors官方没有明确解释，后面研究

2）health:健康检查，提供了指定端口（默认为8080）上的HTTP端点，如果实例是健康的，则返回“OK”。

3）cluster.local：CoreDNS为kubernetes提供的域，10.254.0.0/18这告诉Kubernetes中间件它负责为反向区域提供PTR请求0.0.254.10.in-addr.arpa ..换句话说，这是允许反向DNS解析服务（我们经常使用到得DNS服务器里面有两个区域，即“正向查找区域”和“反向查找区域”，正向查找区域就是我们通常所说的域名解析，反向查找区域即是这里所说的IP反向解析，它的作用就是通过查询IP地址的PTR记录来得到该IP地址指向的域名，当然，要成功得到域名就必需要有该IP地址的PTR记录。PTR记录是邮件交换记录的一种，邮件交换记录中有A记录和PTR记录，A记录解析名字到地址，而PTR记录解析地址到名字。地址是指一个客户端的IP地址，名字是指一个客户的完全合格域名。通过对PTR记录的查询，达到反查的目的。）

4）proxy:这可以配置多个upstream 域名服务器，也可以用于延迟查找 /etc/resolv.conf 中定义的域名服务器

5）cache:这允许缓存两个响应结果，一个是肯定结果（即，查询返回一个结果）和否定结果（查询返回“没有这样的域”），具有单独的高速缓存大小和TTLs。

# 这里 kubernetes cluster.local 为 创建 svc 的 IP 段

kubernetes cluster.local 10.254.0.0/18 

# clusterIP  为 指定 DNS 的 IP

clusterIP: 10.254.0.2

创建coreDNS

[root@master1 src]# kubectl apply -f coredns.yaml
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.extensions/coredns created
service/kube-dns created

查看创建：

[root@master1 src]# kubectl get pod,svc -n kube-system -o wide
NAME                                          READY     STATUS    RESTARTS   AGE       IP               NODE      NOMINATED NODE
pod/calico-kube-controllers-79cfd7887-scnnp   1/1       Running   1          2d        192.168.161.78   node2     <none>
pod/calico-node-pwlq4                         2/2       Running   2          2d        192.168.161.77   node1     <none>
pod/calico-node-vmrrq                         2/2       Running   2          2d        192.168.161.78   node2     <none>
pod/coredns-55f86bf584-fqjf2                  1/1       Running   0          23s       10.254.102.139   node1     <none>
pod/coredns-55f86bf584-hsrbp                  1/1       Running   0          23s       10.254.75.21     node2     <none>

NAME               TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE       SELECTOR
service/kube-dns   ClusterIP   10.254.0.2   <none>        53/UDP,53/TCP   23s       k8s-app=kube-dns

检查日志

[root@master1 src]# kubectl logs coredns-55f86bf584-hsrbp -n kube-system
.:53
2018/09/22 02:03:06 [INFO] CoreDNS-1.2.2
2018/09/22 02:03:06 [INFO] linux/amd64, go1.11, eb51e8b
CoreDNS-1.2.2
linux/amd64, go1.11, eb51e8b

验证 dns 服务

在验证 dns 之前，在 dns 未部署

之前创建的 pod 与 deployment 等，都必须删除

，重新部署，否则无法解析。

创建一个 pods 来测试一下 dns

apiVersion: v1
kind: Pod
metadata:
  name: alpine
spec:
  containers:
  - name: alpine
    image: alpine
    command:
    - sleep
    - "3600"

查看创建的服务

[root@master1 ~]# kubectl get po,svc -o wide
NAME                           READY     STATUS    RESTARTS   AGE       IP               NODE      NOMINATED NODE
pod/alpine                     1/1       Running   0          52s       10.254.102.141   node1     <none>
pod/nginx-dm-fff68d674-fzhqk   1/1       Running   0          3m        10.254.102.140   node1     <none>
pod/nginx-dm-fff68d674-h8n79   1/1       Running   0          3m        10.254.75.22     node2     <none>

NAME                 TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE       SELECTOR
service/kubernetes   ClusterIP   10.254.0.1      <none>        443/TCP   20d       <none>
service/nginx-svc    ClusterIP   10.254.10.144   <none>        80/TCP    3m        name=nginx

测试

[root@master1 ~]#  kubectl exec -it alpine nslookup nginx-svc
nslookup: can't resolve '(null)': Name does not resolve

Name:      nginx-svc
Address 1: 10.254.10.144 nginx-svc.default.svc.cluster.local

部署 DNS 自动伸缩

按照 node 数量自动伸缩 dns 数量

vim dns-auto-scaling.yaml

kind: ServiceAccount
apiVersion: v1
metadata:
  name: kube-dns-autoscaler
  namespace: kube-system
  labels:
    addonmanager.kubernetes.io/mode: Reconcile
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: system:kube-dns-autoscaler
  labels:
    addonmanager.kubernetes.io/mode: Reconcile
rules:
  - apiGroups: [""]
    resources: ["nodes"]
    verbs: ["list"]
  - apiGroups: [""]
    resources: ["replicationcontrollers/scale"]
    verbs: ["get", "update"]
  - apiGroups: ["extensions"]
    resources: ["deployments/scale", "replicasets/scale"]
    verbs: ["get", "update"]
  - apiGroups: [""]
    resources: ["configmaps"]
    verbs: ["get", "create"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: system:kube-dns-autoscaler
  labels:
    addonmanager.kubernetes.io/mode: Reconcile
subjects:
  - kind: ServiceAccount
    name: kube-dns-autoscaler
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: system:kube-dns-autoscaler
  apiGroup: rbac.authorization.k8s.io

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kube-dns-autoscaler
  namespace: kube-system
  labels:
    k8s-app: kube-dns-autoscaler
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  selector:
    matchLabels:
      k8s-app: kube-dns-autoscaler
  template:
    metadata:
      labels:
        k8s-app: kube-dns-autoscaler
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
    spec:
      priorityClassName: system-cluster-critical
      containers:
      - name: autoscaler
        image: jicki/cluster-proportional-autoscaler-amd64:1.1.2-r2
        resources:
            requests:
                cpu: "20m"
                memory: "10Mi"
        command:
          - /cluster-proportional-autoscaler
          - --namespace=kube-system
          - --configmap=kube-dns-autoscaler
          - --target=Deployment/coredns
          - --default-params={"linear":{"coresPerReplica":256,"nodesPerReplica":16,"preventSinglePointFailure":true}}
          - --logtostderr=true
          - --v=2
      tolerations:
      - key: "CriticalAddonsOnly"
        operator: "Exists"
      serviceAccountName: kube-dns-autoscaler

导入文件

[root@master1 ~]# kubectl apply -f dns-auto-scaling.yaml
serviceaccount/kube-dns-autoscaler created
clusterrole.rbac.authorization.k8s.io/system:kube-dns-autoscaler created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-dns-autoscaler created
deployment.apps/kube-dns-autoscaler created

如下是上面所用到的镜像，如果不可以下载使用如下的即可

：

registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:coredns-1.2.2

registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:cluster-proportional-autoscaler-amd64_1.1.2-r2

部署 Ingress 与 Dashboard

部署 heapster

官方 dashboard 的github https://github.com/kubernetes/dashboard

官方 heapster 的github https://github.com/kubernetes/heapster

下载 heapster 相关 yaml 文件

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/grafana.yaml

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/influxdb.yaml

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/heapster.yaml

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/rbac/heapster-rbac.yaml

如上官方镜像一直在更新，修改的时候需要把如下的版本号也修改下↓

下载 heapster 镜像下载

# 官方镜像
k8s.gcr.io/heapster-grafana-amd64:v4.4.3
k8s.gcr.io/heapster-amd64:v1.5.3
k8s.gcr.io/heapster-influxdb-amd64:v1.3.3

# 个人的镜像
jicki/heapster-grafana-amd64:v4.4.3
jicki/heapster-amd64:v1.5.3
jicki/heapster-influxdb-amd64:v1.3.3

# 备用阿里镜像
registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:heapster-grafana-amd64-v4.4.3
registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:heapster-amd64-v1.5.3
registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:heapster-influxdb-amd64-v1.3.3

# 替换所有yaml 镜像地址

sed -i 's/k8s\.gcr\.io/jicki/g' *.yaml

修改 yaml 文件

# heapster.yaml 文件

#### 修改如下部分 #####

因为 kubelet 启用了 https 所以如下配置需要增加 https 端口

        - --source=kubernetes:https://kubernetes.default
修改为
        - --source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250&insecure=true

# heapster-rbac.yaml  文件

#### 修改为部分 #####

将 serviceAccount kube-system:heapster 与 ClusterRole system:kubelet-api-admin 绑定，授予它调用 kubelet API 的权限；


kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: heapster
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:heapster
subjects:
- kind: ServiceAccount
  name: heapster
  namespace: kube-system
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: heapster-kubelet-api
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kubelet-api-admin
subjects:
- kind: ServiceAccount
  name: heapster
  namespace: kube-system

创建：

[root@master1 dashboard180922]# kubectl apply -f .
deployment.extensions/monitoring-grafana created
service/monitoring-grafana created
clusterrolebinding.rbac.authorization.k8s.io/heapster created
clusterrolebinding.rbac.authorization.k8s.io/heapster-kubelet-api created
serviceaccount/heapster created
deployment.extensions/heapster created
service/heapster created
deployment.extensions/monitoring-influxdb created
service/monitoring-influxdb created

这儿可能需要等待一下，这个取决于自己server的网络情况：

[root@node1 ~]# journalctl -u kubelet -f
-- Logs begin at 六 2018-09-22 09:07:48 CST. --
9月 22 10:34:55 node1 kubelet[2301]: I0922 10:34:55.701016    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [=======>                ]  7.617MB/50.21MB"
9月 22 10:35:05 node1 kubelet[2301]: I0922 10:35:05.700868    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [========>                ]  8.633MB/50.21MB"
9月 22 10:35:15 node1 kubelet[2301]: I0922 10:35:15.701193    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [==========>                ]  10.66MB/50.21MB"
9月 22 10:35:25 node1 kubelet[2301]: I0922 10:35:25.700980    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [============>                ]  12.69MB/50.21MB"
9月 22 10:35:35 node1 kubelet[2301]: I0922 10:35:35.700779    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [===============>                ]  15.74MB/50.21MB"
9月 22 10:35:45 node1 kubelet[2301]: I0922 10:35:45.701359    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [==================>                ]  18.28MB/50.21MB"
9月 22 10:35:55 node1 kubelet[2301]: I0922 10:35:55.701618    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [====================>                ]  20.82MB/50.21MB"
9月 22 10:36:05 node1 kubelet[2301]: I0922 10:36:05.701611    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [=========================>                ]  25.39MB/50.21MB"
9月 22 10:36:15 node1 kubelet[2301]: I0922 10:36:15.700926    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [==============================>                ]  30.99MB/50.21MB"
9月 22 10:36:25 node1 kubelet[2301]: I0922 10:36:25.700931    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [==================================>                ]  34.55MB/50.21MB"
9月 22 10:36:35 node1 kubelet[2301]: I0922 10:36:35.701950    2301 kube_docker_client.go:345] Pulling image "jicki/heapster-grafana-amd64:v4.4.3": "a05a7a3d2d4f: Downloading [==================================>                ]  34.55MB/50.21MB"

查看部署情况

[root@master1 dashboard180922]# kubectl get po,svc -n kube-system -o wide
NAME                                          READY     STATUS    RESTARTS   AGE       IP               NODE      NOMINATED NODE
pod/calico-kube-controllers-79cfd7887-scnnp   1/1       Running   1          2d        192.168.161.78   node2     <none>
pod/calico-node-pwlq4                         2/2       Running   2          2d        192.168.161.77   node1     <none>
pod/calico-node-vmrrq                         2/2       Running   2          2d        192.168.161.78   node2     <none>
pod/coredns-55f86bf584-fqjf2                  1/1       Running   0          44m       10.254.102.139   node1     <none>
pod/coredns-55f86bf584-hsrbp                  1/1       Running   0          44m       10.254.75.21     node2     <none>
pod/heapster-745d7bc8b7-zk65c                 1/1       Running   0          13m       10.254.75.51     node2     <none>
pod/kube-dns-autoscaler-66d448df8f-4zvw6      1/1       Running   0          32m       10.254.102.142   node1     <none>
pod/monitoring-grafana-558c44f948-m2tzz       1/1       Running   0          1m        10.254.75.6      node2     <none>
pod/monitoring-influxdb-f6bcc9795-496jd       1/1       Running   0          13m       10.254.102.147   node1     <none>

NAME                          TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE       SELECTOR
service/heapster              ClusterIP   10.254.4.11    <none>        80/TCP          13m       k8s-app=heapster
service/kube-dns              ClusterIP   10.254.0.2     <none>        53/UDP,53/TCP   44m       k8s-app=kube-dns
service/monitoring-grafana    ClusterIP   10.254.25.50   <none>        80/TCP          1m        k8s-app=grafana
service/monitoring-influxdb   ClusterIP   10.254.37.83   <none>        8086/TCP        13m       k8s-app=influxdb

部署 dashboard

下载 dashboard 镜像

# 官方镜像
k8s.gcr.io/kubernetes-dashboard-amd64:v1.8.3

# 个人的镜像
jicki/kubernetes-dashboard-amd64:v1.8.3

# 阿里的镜像
registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:kubernetes-dashboard-amd64-v1.8.3

下载 yaml 文件

curl -O https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

导入 yaml

# 替换所有的 images，注意修改镜像版本号为1.8.3

sed -i 's/k8s\.gcr\.io/jicki/g' kubernetes-dashboard.yaml

创建dashboard

[root@master1 dashboard180922]# kubectl apply -f kubernetes-dashboard.yaml
secret/kubernetes-dashboard-certs created
serviceaccount/kubernetes-dashboard created
role.rbac.authorization.k8s.io/kubernetes-dashboard-minimal created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard-minimal created
deployment.apps/kubernetes-dashboard created
service/kubernetes-dashboard created

查看创建的dashboard

[root@master1 dashboard180922]# kubectl get po,svc -n kube-system -o wide | grep dashboard
pod/kubernetes-dashboard-65666d4586-bb66s     1/1       Running   0          7m        10.254.102.151   node1     <none>

service/kubernetes-dashboard   ClusterIP   10.254.3.42    <none>        443/TCP         7m        k8s-app=kubernetes-dashboard

部署 Nginx Ingress

Kubernetes 暴露服务的方式目前只有三种：LoadBlancer Service、NodePort Service、Ingress；什么是 Ingress ? Ingress 就是利用 Nginx Haproxy 等负载均衡工具来暴露 Kubernetes 服务。

官方 Nginx Ingress github: https://github.com/kubernetes/ingress-nginx/

配置调度 node

# ingress 有多种方式 

1.  deployment 自由调度 replicas
2.  daemonset 全局调度 分配到所有node里

#  deployment 自由调度过程中，由于我们需要 约束 controller 调度到指定的 node 中，所以需要对 node 进行 label 标签

# 默认如下:
[root@master1 ~]# kubectl get node
NAME      STATUS    ROLES     AGE       VERSION
node1     Ready     <none>    20d       v1.11.2
node2     Ready     <none>    8d        v1.11.2

# 对 node1 与 node2 打上 label

[root@master1 ~]# kubectl label nodes node1 ingress=proxy
node/node1 labeled
[root@master1 ~]# kubectl label nodes node2 ingress=proxy
node/node2 labeled

# 打完标签以后

[root@master1 ~]# kubectl get nodes --show-labels
NAME      STATUS    ROLES     AGE       VERSION   LABELS
node1     Ready     <none>    20d       v1.11.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,ingress=proxy,kubernetes.io/hostname=node1
node2     Ready     <none>    9d        v1.11.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,ingress=proxy,kubernetes.io/hostname=node2

下载镜像

# 官方镜像
gcr.io/google_containers/defaultbackend:1.4
quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.16.2

# 国内镜像
jicki/defaultbackend:1.4
jicki/nginx-ingress-controller:0.16.2

# 阿里镜像
registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:defaultbackend-1.4
registry.cn-hangzhou.aliyuncs.com/zhdya_centos_docker/zhdya_cc:nginx-ingress-controller-0.16.2

下载 yaml 文件

部署 Nginx backend , Nginx backend 用于统一转发没有的域名到指定页面。

curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/namespace.yaml

curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/default-backend.yaml

curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/configmap.yaml

curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/tcp-services-configmap.yaml

curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/udp-services-configmap.yaml

# 部署 Ingress RBAC 认证

curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/rbac.yaml


# 部署 Ingress Controller 组件

curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/with-rbac.yaml

# tcp-service 与 udp-service, 由于 ingress 不支持 tcp 与 udp 的转发，所以这里配置了两个基于 tcp 与 udp 的 service ,通过 --tcp-services-configmap 与 --udp-services-configmap 来配置 tcp 与 udp 的转发服务


# 为了更加方便理解，如下两个例子：

# tcp 例子

apiVersion: v1
kind: ConfigMap
metadata:
  name: tcp-services
  namespace: ingress-nginx
data:
  9000: "default/tomcat:8080"
  
#  以上配置， 转发 tomcat:8080 端口 到 ingress 节点的 9000 端口中

# udp 例子

apiVersion: v1
kind: ConfigMap
metadata:
  name: udp-services
  namespace: ingress-nginx
data:
  53: "kube-system/kube-dns:53"


# 替换所有的 images

sed -i 's/gcr\.io\/google_containers/jicki/g' *
sed -i 's/quay\.io\/kubernetes-ingress-controller/jicki/g' *


# 上面 对 两个 node 打了 label 所以配置 replicas: 2
# 修改 yaml 文件 增加 rbac 认证 , hostNetwork  还有 nodeSelector, 第二个 spec 下 增加。

vim with-rbac.yaml

第一处：↓
spec:
  replicas: 2
  
第二处：↓（搜索 /nginx-ingress-serviceaccount 即可，在其下添加）
  ....
    spec:
      serviceAccountName: nginx-ingress-serviceaccount
      hostNetwork: true
      nodeSelector:
        ingress: proxy
    ....
    第三处：↓
          # 这里添加一个 other 端口做为后续tcp转发
          ports:
          - name: http
            containerPort: 80
          - name: https
            containerPort: 443
          - name: other
            containerPort: 8888

导入 yaml 文件

[root@master1 ingress-service]# kubectl apply -f namespace.yaml
namespace/ingress-nginx created

[root@master1 ingress-service]# kubectl get ns
NAME            STATUS    AGE
default         Active    20d
ingress-nginx   Active    6s
kube-public     Active    20d
kube-system     Active    20d

[root@master1 ingress-service]# kubectl apply -f .
configmap/nginx-configuration created
deployment.extensions/default-http-backend created
service/default-http-backend created
namespace/ingress-nginx configured
serviceaccount/nginx-ingress-serviceaccount created
clusterrole.rbac.authorization.k8s.io/nginx-ingress-clusterrole created
role.rbac.authorization.k8s.io/nginx-ingress-role created
rolebinding.rbac.authorization.k8s.io/nginx-ingress-role-nisa-binding created
clusterrolebinding.rbac.authorization.k8s.io/nginx-ingress-clusterrole-nisa-binding created
configmap/tcp-services created
configmap/udp-services created
deployment.extensions/nginx-ingress-controller created

# 查看服务，可以看到这两个 pods 被分别调度到 77 与 78 中

[root@master1 ingress-service]# kubectl get pods -n ingress-nginx -o wide
NAME                                       READY     STATUS    RESTARTS   AGE       IP               NODE      NOMINATED NODE
default-http-backend-6b89c8bdcb-vvl9f      1/1       Running   0          9m        10.254.102.163   node1     <none>
nginx-ingress-controller-cf8d4564d-5vz7h   1/1       Running   0          9m        10.254.75.16     node2     <none>
nginx-ingress-controller-cf8d4564d-z7q4b   1/1       Running   0          9m        10.254.102.158   node1     <none>

# 查看我们原有的 svc

[root@master1 ingress-service]#  kubectl get pods -o wide
NAME                       READY     STATUS    RESTARTS   AGE       IP               NODE      NOMINATED NODE
alpine                     1/1       Running   3          6h        10.254.102.141   node1     <none>
nginx-dm-fff68d674-fzhqk   1/1       Running   0          6h        10.254.102.140   node1     <none>
nginx-dm-fff68d674-h8n79   1/1       Running   0          6h        10.254.75.22     node2     <none>

创建一个基于 nginx-dm 的 ingress

vi nginx-ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-ingress
spec:
  rules:
  - host: nginx.zhdya.cn
    http:
      paths:
      - backend:
          serviceName: nginx-svc
          servicePort: 80
          
理解如下:

- host指虚拟出来的域名，具体地址(我理解应该是Ingress-controller那台Pod所在的主机的地址)应该加入/etc/hosts中,这样所有去nginx.zhdya.cn的请求都会发到nginx

- servicePort主要是定义服务的时候的端口，不是NodePort.

# 查看服务

[root@master1 ingress-service]# kubectl create -f nginx-ingress.yaml
ingress.extensions/nginx-ingress created

[root@master1 ingress-service]#  kubectl get ingress
NAME            HOSTS            ADDRESS   PORTS     AGE
nginx-ingress   nginx.zhdya.cn             80        10s

# 测试访问

[root@node1 ~]# curl nginx.zhdya.cn
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

当然如果本地浏览器访问的话我们也需要绑定hosts

kubernetes 1.11.2整理Ⅲ

# 创建一个基于 dashboard 的 https 的 ingress
# 新版本的 dashboard 默认就是 ssl ,所以这里使用 tcp 代理到 443 端口

# 查看 dashboard svc

[root@master1 ~]# kubectl get svc -n kube-system
NAME                   TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
heapster               ClusterIP   10.254.4.11    <none>        80/TCP          2d
kube-dns               ClusterIP   10.254.0.2     <none>        53/UDP,53/TCP   3d
kubernetes-dashboard   ClusterIP   10.254.3.42    <none>        443/TCP         2d
monitoring-grafana     ClusterIP   10.254.25.50   <none>        80/TCP          2d
monitoring-influxdb    ClusterIP   10.254.37.83   <none>        8086/TCP        2d

# 修改 tcp-services-configmap.yaml 文件

[root@master1 src]# vim tcp-services-configmap.yaml

kind: ConfigMap
apiVersion: v1
metadata:
  name: tcp-services
  namespace: ingress-nginx
data:
  8888: "kube-system/kubernetes-dashboard:443"

# 载入配置文件

[root@master1 src]# kubectl apply -f tcp-services-configmap.yaml
configmap/tcp-services configured

# 查看服务

[root@master1 src]#  kubectl get configmap/tcp-services -n ingress-nginx
NAME           DATA      AGE
tcp-services   1         2d

[root@master1 src]# kubectl describe configmap/tcp-services -n ingress-nginx
Name:         tcp-services
Namespace:    ingress-nginx
Labels:       <none>
Annotations:  kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","data":{"8888":"kube-system/kubernetes-dashboard:443"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"tcp-services","namesp...

Data
====
8888:
----
kube-system/kubernetes-dashboard:443
Events:
  Type    Reason  Age   From                      Message
  ----    ------  ----  ----                      -------
  Normal  CREATE  2d    nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services
  Normal  CREATE  2d    nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services
  Normal  CREATE  2d    nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services
  Normal  CREATE  2d    nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services
  Normal  CREATE  20m   nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services
  Normal  CREATE  19m   nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services
  Normal  CREATE  19m   nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services
  Normal  UPDATE  1m    nginx-ingress-controller  ConfigMap ingress-nginx/tcp-services

# 测试访问

[root@node1 ~]# curl -I -k https://dashboard.zhdya.cn:8888
curl: (6) Could not resolve host: dashboard.zhdya.cn; 未知的名称或服务
当然如上报错很正常，咱们需要绑定下hosts

在master 上查询下：
[root@master1 src]# kubectl get svc -n kube-system -o wide | grep dashboard
kubernetes-dashboard   ClusterIP   10.254.3.42    <none>        443/TCP         2d        k8s-app=kubernetes-dashboard

然后再node端绑定hosts 
[root@node1 ~]# vim /etc/hosts

10.254.3.42 dashboard.zhdya.cn

[root@node1 ~]# curl -I -k https://dashboard.zhdya.cn:8888
HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: no-store
Content-Length: 990
Content-Type: text/html; charset=utf-8
Last-Modified: Tue, 13 Feb 2018 11:17:03 GMT
Date: Tue, 25 Sep 2018 02:51:18 GMT

# 配置一个基于域名的 https , ingress

# 创建一个 基于 自身域名的 证书

[root@master1 dashboard-keys]# openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -keyout dashboard.zhdya.cn-key.key -out dashboard.zhdya.cn.pem -subj "/CN=dashboard.zhdya.cn"
Generating a 2048 bit RSA private key
.......+++
..............+++
writing new private key to 'dashboard.zhdya.cn-key.key'
-----

[root@master1 dashboard-keys]# kubectl create secret tls dashboard-secret --namespace=kube-system --cert dashboard.zhdya.cn.pem --key dashboard.zhdya.cn-key.key
secret/dashboard-secret created

# 查看 secret

[root@master1 dashboard-keys]# kubectl get secret -n kube-system | grep dashboard
dashboard-secret                      kubernetes.io/tls                     2         55s
kubernetes-dashboard-certs            Opaque                                0         2d
kubernetes-dashboard-key-holder       Opaque                                2         2d
kubernetes-dashboard-token-r98wk      kubernetes.io/service-account-token   3         2d

# 创建一个 ingress

vi dashboard-ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  annotations:
    ingress.kubernetes.io/ssl-passthrough: "true"
    nginx.ingress.kubernetes.io/secure-backends: "true"
spec:
  tls:
  - hosts:
    - dashboard.zhdya.cn
    secretName: dashboard-secret
  rules:
  - host: dashboard.zhdya.cn
    http:
      paths:
      - path: /
        backend:
          serviceName: kubernetes-dashboard
          servicePort: 443

# 创建配置文件
[root@master1 src]# kubectl apply -f dashboard-ingress.yaml
ingress.extensions/kubernetes-dashboard created

[root@master1 src]# kubectl get ingress -n kube-system
NAME                   HOSTS                ADDRESS   PORTS     AGE
kubernetes-dashboard   dashboard.zhdya.cn             80, 443   37s

测试访问

kubernetes 1.11.2整理Ⅲ

# 登录认证

# 首先创建一个 dashboard rbac 超级用户

vi dashboard-admin-rbac.yaml

---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-admin
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard-admin
  labels:
    k8s-app: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: kubernetes-dashboard-admin
  namespace: kube-system

# 导入配置文件

[root@master1 src]# kubectl apply -f dashboard-admin-rbac.yaml
serviceaccount/kubernetes-dashboard-admin created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard-admin created

# 查看超级用户的 token 名称

[root@master1 src]# kubectl -n kube-system get secret | grep kubernetes-dashboard-admin
kubernetes-dashboard-admin-token-kq27d   kubernetes.io/service-account-token   3         38s

# 查看 token 部分

[root@master1 src]# kubectl describe -n kube-system secret/kubernetes-dashboard-admin-token-kq27d

然后我们登录 web ui 选择令牌登录

然后就发现了还是那熟悉的味道：

kubernetes 1.11.2整理Ⅲ

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，也希望大家多多支持码农网

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kubernetes 1.11.2整理Ⅲ

测试集群

在 安装了 calico 网络的node节点 里 curl

查看 ipvs 规则

配置 CoreDNS

下载 yaml 文件

配置说明

创建coreDNS

查看创建：

检查日志

验证 dns 服务

创建一个 pods 来测试一下 dns

查看 创建的服务

测试

部署 DNS 自动伸缩

按照 node 数量 自动伸缩 dns 数量

导入文件

部署 Ingress 与 Dashboard

部署 heapster

下载 heapster 相关 yaml 文件

下载 heapster 镜像下载

修改 yaml 文件

创建：

查看部署情况

部署 dashboard

下载 dashboard 镜像

部署 Nginx Ingress

配置 调度 node

下载镜像

下载 yaml 文件

部署 Nginx backend , Nginx backend 用于统一转发 没有的域名 到指定页面。

导入 yaml 文件

创建一个 基于 nginx-dm 的 ingress

测试访问

然后我们登录 web ui 选择 令牌登录

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Markdown 在线编辑器

在安装了 calico 网络的node节点里 curl

查看创建的服务

按照 node 数量自动伸缩 dns 数量

配置调度 node

部署 Nginx backend , Nginx backend 用于统一转发没有的域名到指定页面。

创建一个基于 nginx-dm 的 ingress

然后我们登录 web ui 选择令牌登录