基于k8s的nginx双VIP高可用集群

2021/9/9 7:05:14

编程Tag： nginx name 00 nfs k8s 192.168 lft VIP

本文主要是介绍基于k8s的nginx双VIP高可用集群，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

规划

Ip	Role
192.168.153.110	VIP1
192.168.153.111	VIP2
192.168.153.123	LB
192.168.153.124	LB
192.168.153.125	master
192.168.153.126	node1
192.168.153.127	node2
192.168.153.128	node3
192.168.153.129	node4、NFS
192.168.153.135	client

规划图
请添加图片描述

k8s集群搭建

ansible配置

vim /etc/ansible/hosts

[k8s]
192.168.153.126
192.168.153.127
192.168.153.125
192.168.153.128
192.168.153.129

[master]
192.168.153.125

[node]
192.168.153.126
192.168.153.127
192.168.153.128
192.168.153.129

配置免密

master节点上执行

ssh-keygen
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.153.125
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.153.126
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.153.127
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.153.128
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.153.129

修改主机名

在master和node节点上修改主机名，主机名需唯一
vim /etc/hostnmae

master

vim hosts.sh

cat >> /etc/hosts <<EOF
192.168.153.125 master
192.168.153.126 node1
192.168.153.127 node2
192.168.153.128 node3
192.168.153.129 node4
EOF

允许 iptables 检查桥接流量

编写如下脚本
vim bri-change.sh

# 加载br_netfilter 模块
modprobe br_netfilter

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system

ansible k8s -m script -a './bri-change.sh'

检查修改效果

ansible k8s -m shell -a 'cat /etc/sysctl.d/k8s.conf'

192.168.153.128 | CHANGED | rc=0 >>
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
192.168.153.126 | CHANGED | rc=0 >>
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
192.168.153.129 | CHANGED | rc=0 >>
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
192.168.153.125 | CHANGED | rc=0 >>
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
192.168.153.127 | CHANGED | rc=0 >>
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1

安装docker

安装必要的一些系统工具

yum install -y yum-utils device-mapper-persistent-data lvm2

下载国内的源

yum-config-manager   --add-repo    https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安装docker

yum install -y docker-ce docker-ce-cli containerd.io

启动docker

systemctl start docker

配置docker

 cat >> /etc/docker/daemon.json <<EOF
{
registry-mirrors":[
'https://registry.docker-cn.com.
"http://hub-mirror.c.163.com*,
"https://docker.mirrors.ustc.edu.cn"
]
}
EOF

安装 kubeadm、kubelet 和 kubectl

ansible k8s -m script -a './k8s-repo.sh'

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes Repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
enable=1
EOF

# 将 SELinux 设置为 permissive 模式（相当于将其禁用）
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

sudo yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0

sudo systemctl enable

初始化Master

初始化

 kubeadm init \
--apiserver-advertise-address=192.168.153.125 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.0 \
--service-cidr=10.1.0.0/16\
--pod-network-cidr=10.244.0.0/16

将apiserver-advertise-address修改为本机地址

开始集群

mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

保留节点加入的命令

kubeadm join 192.168.153.125:6443 --token z8weg1.pz9jz431d9gfndmu \
    --discovery-token-ca-cert-hash sha256:b7ba775a440aa595a1c5e3691291d8e2325d535c7397681cbc436e850ea94974

部署CNI网络

wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
sed -i -r "s#quay.io/coreos/flannel:.*-amd64#lizhenliang/flannel:v0.12.0-amd64#g" kube-flannel.yml

kubectl apply -f kube-flannel.yml

稍微等待pod起来

查看node状态

 kubectl get node
NAME     STATUS   ROLES    AGE   VERSION
master   Ready    master   34m   v1.18.0

接入节点

使用上面保存节点加入的命令，在各node节点上执行

kubeadm join 192.168.153.125:6443 --token z8weg1.pz9jz431d9gfndmu \
    --discovery-token-ca-cert-hash sha256:b7ba775a440aa595a1c5e3691291d8e2325d535c7397681cbc436e850ea94974

在master上查看node接入情况

kubectl get node
NAME     STATUS   ROLES    AGE   VERSION
master   Ready    master   42m   v1.18.0
node1    Ready    <none>   68s   v1.18.0
node2    Ready    <none>   66s   v1.18.0
node3    Ready    <none>   64s   v1.18.0
node4    Ready    <none>   62s   v1.18.0

NFS服务器搭建

安装 nfs 服务器所需的软件包

yum install -y rpcbind nfs-utils

创建 exports 文件

/nfs_data/ *(insecure,rw,sync,no_root_squash)

启动 nfs 服务

mkdir /nfs_data

systemctl enable rpcbind
systemctl enable nfs-server

systemctl start rpcbind
systemctl start nfs-server
exportfs -r

检查配置是否生效

exportfs

# exportfs
/nfs_data    <world>

客户端测试NFS

在k8s集群的所有nfs客户端节点都需执行此命令

yum install -y nfs-utils

检查nfs服务器端是否共享

 showmount -e 192.168.153.129
Export list for 192.168.153.129:
/nfs_data *

挂载

mkdir /mnt/nfsmount
mount -t nfs 192.168.153.129:/nfs_data /mnt/nfsmount

测试是否挂载成功

客户端

echo "hello nfs server" > /mnt/nfsmount/test.txt

nfs服务端查看

cat /nfs_data/test.txt 
hello nfs server

部署nginx服务

方式：helm

使用nodeport暴露服务，将nginx数据挂载到nfs服务器上

安装helm

wget https://get.helm.sh/helm-v3.3.1-linux-amd64.tar.gz 
tar -zxvf helm-v3.3.1-linux-amd64.tar.gz       
mv linux-amd64/helm /usr/local/bin/

查看helm版本

helm version
version.BuildInfo{Version:"v3.3.1", GitCommit:"249e5215cde0c3fa72e27eb7a30e8d55c9696144", GitTreeState:"clean", GoVersion:"go1.14.7"}

helm chart结构

tree
.
├── Chart.yaml
├── README.md
├── templates
│   ├── configmap1.yaml
│   ├── configmap2.yaml
│   ├── deployment.yaml
│   ├── _helpers.tpl
│   ├── NOTES.txt
│   ├── pvc.yaml
│   ├── pv.yaml
│   └── service.yaml
└── values.yaml

helm chart内容

Chart

apiVersion: v2
name: nginx
description: A Helm chart for Kubernetes

# A chart can be either an 'application' or a 'library' chart.
#
# Application charts are a collection of templates that can be packaged into versioned archives
# to be deployed.
#
# Library charts provide useful utilities or functions for the chart developer. They're included as
# a dependency of application charts to inject those utilities and functions into the rendering
# pipeline. Library charts do not define any templates and therefore cannot be deployed.
type: application

# This is the chart version. This version number should be incremented each time you make changes
# to the chart and its templates, including the app version.
# Versions are expected to follow Semantic Versioning (https://semver.org/)
version: 0.1.0

# This is the version number of the application being deployed. This version number should be
# incremented each time you make changes to the application. Versions are not expected to
# follow Semantic Versioning. They should reflect the version the application is using.
appVersion: latest

deployment.yaml

kind: Deployment
apiVersion: apps/v1
metadata:
  name: {{ .Release.Name}}
  namespace: {{ .Release.Namespace }}
  labels:
    {{- include "nginx.labels" . | nindent 4 }}
    dce.daocloud.io/component: {{ include "nginx.fullname" . }}
    dce.daocloud.io/app: {{ include "nginx.fullname" . }} 
spec:
  selector:
    matchLabels:
        {{- include "nginx.selectorLabels" . | nindent 6 }}
  template:
    metadata:
      name: {{ .Release.Name  }}
      labels: 
        {{- include "nginx.selectorLabels" . | nindent 8 }}
    spec:
      volumes:
        - name: {{ .Values.configmap1.name }}
          configMap:
            name: {{ .Values.configmap1.name }}
            defaultMode: 420
        - name: {{ .Values.configmap2.name }}
          configMap:
            name: {{ .Values.configmap2.name}}
            items:
              - key: nginx.conf
                path: nginx.conf
            defaultMode: 420
        - name: {{ .Values.nfs.name }}
          persistentVolumeClaim:
            claimName: {{ .Release.Name }}-pvc

      containers:
        - name: {{ .Release.Name }}
          image: "{{ .Values.image.repository }}:{{ .Chart.AppVersion }}"
          imagePullPolicy: {{ .Values.image.pullPolicy }}
          volumeMounts:
            - name: {{ .Values.configmap1.name }}
              mountPath: {{ .Values.volumemount.configmap1.path }} 
            - name: {{ .Values.configmap2.name }}
              mountPath: {{ .Values.volumemount.configmap2.path }}
              subPath: {{ .Values.volumemount.configmap2.subPath }}
            - name: {{ .Values.nfs.name }}
              mountPath: {{ .Values.nfs.mountpath}}

          resources: 
              {{- toYaml .Values.resources | nindent 12 }}
      {{- with .Values.affinity }}
      affinity:
        {{- toYaml . | nindent 8 }} 
      {{- end }}
      {{- with .Values.tolerations }}
      tolerations:
        {{- toYaml . | nindent 8 }}
      {{- end }}

value.yaml

# Default values for nginx.
# This is a YAML-formatted file.
# Declare variables to be passed into your templates.

image:
  repository: nginx
  pullPolicy: IfNotPresent
  # Overrides the image tag whose default is the chart version.

imagePullSecrets: []
nameOverride: ""
fullnameOverride: ""

service:
  type: NodePort

resources:  
   #We usually recommend not to specify default resources and to leave this as a conscious
  # choice for the user. This also increases chances charts run on environments with little
  # resources, such as Minikube. If you do want to specify resources, uncomment the following
  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
   limits:
     cpu: 100m
     memory: 128Mi
   requests:
     cpu: 100m
     memory: 128Mi


tolerations: []

affinity: {}


# pv和pvc容量
storage: 10Gi
# pv访问模式
accessModes: ReadWriteOnce


nfs:
  name: nginx-data
  #
  version: 4.1
  # 挂载到容器上的路径
  mountpath: /usr/share/nginx/html
  # nfs服务器上已存在的路径
  path: /nfs_data
  # nfs服务器地址
  server: 192.168.153.129
  pv:
    # 回收策略
    persistentVolumeReclaimPolicy: Retain

configmap1:
  # conf.d的volume名字(由小写字母数字及字符'-'组成)
  name: nginx-conf-d

configmap2:
  # nginx.conf的volume名字(由小写字母数字及字符'-'组成)
  name: nginx-conf
  # nginx.conf的volume路径
  path: /etc/nginx/nginx.conf 

volumemount:
  # conf.d的volume挂载路径
  configmap1: 
    path: /etc/nginx/conf.d
  # nginx.conf的volume挂载路径
  configmap2:
    path: /etc/nginx/nginx.conf
    subPath: nginx.conf

service.yaml

apiVersion: v1
kind: Service
metadata:
  name: {{ .Release.Name  }}
  labels:
    {{- include "nginx.labels" . | nindent 4 }}
    dce.daocloud.io/component: {{ include "nginx.fullname" . }}
    dce.daocloud.io/app: {{ include "nginx.fullname" . }}
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
      name: http
  selector:
    {{- include "nginx.selectorLabels" . | nindent 4 }}

  type: NodePort

configmap1

apiVersion: v1
kind: Service
metadata:
  name: {{ .Release.Name  }}
  labels:
    {{- include "nginx.labels" . | nindent 4 }}
    dce.daocloud.io/component: {{ include "nginx.fullname" . }}
    dce.daocloud.io/app: {{ include "nginx.fullname" . }}
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
      name: http
  selector:
    {{- include "nginx.selectorLabels" . | nindent 4 }}

  type: NodePort
[root@master nginx]# cat templates/configmap1.yaml 
kind: ConfigMap
apiVersion: v1
metadata:
  name: {{ .Values.configmap1.name }}
data:
  conf.d: |
    server {
         listen       80;
         server_name  localhost;
 
         charset utf-8;
         #access_log  /var/log/nginx/log/host.access.log  main;
 
         location / {
             root   /usr/share/nginx/html;
             index  index.html index.htm;
         }
 
         #error_page  404              /404.html;
 
         # redirect server error pages to the static page /50x.html
         #
         error_page   500 502 503 504  /50x.html;
         location = /50x.html {
             root   /usr/share/nginx/html;
         }
     }

configmap2

kind: ConfigMap
apiVersion: v1
metadata:
  name: {{ .Values.configmap2.name }}
data:
 nginx.conf: |
    user nginx;
    worker_processes auto;
    error_log /var/log/nginx/error.log;
    pid /run/nginx.pid;

    # Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
    include /usr/share/nginx/modules/*.conf;

    events {
        worker_connections 1024;
    }

    http {
        log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                          '$status $body_bytes_sent "$http_referer" '
                         '"$http_user_agent" "$http_x_forwarded_for"';

        access_log  /var/log/nginx/access.log  main;

        sendfile            on;
       # tcp_nopush          on;
       # tcp_nodelay         on;
        keepalive_timeout   65;
        types_hash_max_size 4096;

        include             /etc/nginx/mime.types;
        default_type        application/octet-stream;

        # Load modular configuration files from the /etc/nginx/conf.d directory.
        # See http://nginx.org/en/docs/ngx_core_module.html#include
        # for more information.
        include /etc/nginx/conf.d/*.conf;

        server {
            listen       80;
            listen       [::]:80;
            server_name  _;
            location / {
              root         /usr/share/nginx/html;
              index index.html index.htm;
              }
            # Load configuration files for the default server block.
            include /etc/nginx/default.d/*.conf;

            error_page 404 /404.html;
            location = /favicon.ico{
              log_not_found off;
            }
            location = /404.html {
            }

            error_page 500 502 503 504 /50x.html;
            location = /50x.html {
            }
           }
           include /etc/nginx/conf.d/*.conf;
       }

pv

apiVersion: v1
kind: PersistentVolume
metadata:
  name: {{ .Values.nfs.name }}-pv
spec:
  capacity:
    storage: {{ .Values.storage }}
  accessModes:
    - {{ .Values.accessModes }}
  storageClassName: nfs
  persistentVolumeReclaimPolicy: {{ .Values.nfs.pv.persistentVolumeReclaimPolicy }}
  mountOptions:
    - hard
    - nfsvers= {{- .Values.nfs.version}}
  nfs:
    path: {{ .Values.nfs.path}}
    server: {{ .Values.nfs.server }}

pvc

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: {{ .Release.Name }}-pvc
spec:
  accessModes:
    - {{ .Values.accessModes }}
  storageClassName: nfs
  volumeMode: Filesystem
  resources:
    requests:
      storage: {{ .Values.storage }}
  volumeName: {{  .Values.nfs.name }}-pv

安装nginx

helm install nginx .

查看启动结果

kubectl get po -owide
NAME                     READY   STATUS    RESTARTS   AGE   IP           NODE    NOMINATED NODE   READINESS GATES
nginx-6848cfd5b8-gdttn   1/1     Running   0          12h   10.244.2.4   node2   <none>           <none>
nginx-6848cfd5b8-mmj2s   1/1     Running   0          12h   10.244.1.5   node1   <none>           <none>

 kubectl get svc
NAME         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.1.0.1       <none>        443/TCP        37h
nginx        NodePort    10.1.147.111   <none>        80:31982/TCP   12h

访问

在这里插入图片描述

反向代理

keepalived实现双vip

部署keepalived

安装keepalived

在负载均衡器上安装keepalived

 yum install keepalived -y

查看版本

keepalived --version
Keepalived v1.3.5 (03/19,2017), git commit v1.3.5-6-g6fa32f2

配置keepalived的参数

LB1

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
  # vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface ens192
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.153.110
    }
}

vrrp_instance VI_2 {
    state BACKUP
    interface ens192
    virtual_router_id 52
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.153.111
    }
}

LB2

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
  # vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens192
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.153.110
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface ens192
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.153.111
    }
}

开启keepalived

[root@localhost ~]systemctl start keepalived
[root@localhost ~]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2021-09-08 20:15:14 HKT; 1s ago
  Process: 9234 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
 Main PID: 9235 (keepalived)
   CGroup: /system.slice/keepalived.service
           ├─9235 /usr/sbin/keepalived -D
           ├─9236 /usr/sbin/keepalived -D
           └─9237 /usr/sbin/keepalived -D

Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: Unable to access script `/etc/keepalived/nginx_check.sh`
Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: Disabling track script chk_nginx since not found
Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: VRRP_Instance(VI_1) removing protocol VIPs.
Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: VRRP_Instance(VI_2) removing protocol VIPs.
Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: Using LinkWatch kernel netlink reflector...
Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: VRRP_Instance(VI_1) Entering BACKUP STATE
Sep 08 20:15:14 localhost.localdomain Keepalived_vrrp[9237]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
Sep 08 20:15:14 localhost.localdomain Keepalived_healthcheckers[9236]: Opening file '/etc/keepalived/keepalived.conf'.
Sep 08 20:15:15 localhost.localdomain Keepalived_vrrp[9237]: VRRP_Instance(VI_2) Transition to MASTER STATE

查看两个LB服务器的ip

LB1

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:a8:b0:b5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.153.123/24 brd 192.168.153.255 scope global noprefixroute ens192
       valid_lft forever preferred_lft forever
    inet 192.168.153.110/32 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fea8:b0b5/64 scope link 
       valid_lft forever preferred_lft forever

LB2

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:a8:42:11 brd ff:ff:ff:ff:ff:ff
    inet 192.168.153.124/24 brd 192.168.153.255 scope global noprefixroute ens192
       valid_lft forever preferred_lft forever
    inet 192.168.153.111/32 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fea8:4211/64 scope link 
       valid_lft forever preferred_lft forever

发现VIP成功飘在LB上

部署nginx

安装nginx

nginx编译安装脚本

此处注意需要加载stream模块

安装之后查看nginx版本

nginx -v
nginx version: nginx/1.19.9

修改nginx配置

    upstream myweb{
          least_conn;
          server 192.168.153.125:30710;
          server 192.168.153.126:30710;
          server 192.168.153.127:30710;
          server 192.168.153.128:30710;
          server 192.168.153.129:30710;
         }


    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass http://myweb;
            root   html;
            index  index.html index.htm;
        }

添加upstream配置

添加完之后，在location处加代理
proxy_pass http://myweb;

修改完之后刷新nginx配置

nginx -s reload

编写检测nginx存活脚本

用于keepalived定时检测nginx的服务状态，如果nginx停止了，会尝试重新启动nginx，如果启动失败，会将keepalived进程杀死，将vip漂移到备份机器上

vim nginx-check.sh
#!/bin/sh
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ]
then
  /usr/sbin/nginx
  sleep 1
  A2=`ps -C nginx --no-header |wc -l`
  if [ $A2 -eq 0 ]
  then
    systemctl stop keepalived
  fi
fi

迁移到指定目录下

cp nginx-check.sh /etc/keepalived/

Client访问vip的80端口

# curl 192.168.153.110:80
hello world
# curl 192.168.153.111:80
hello world

模拟LB1宕机

LB1关闭keepalived

systemctl stop keepalived

查看LB2的ip

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:a8:42:11 brd ff:ff:ff:ff:ff:ff
    inet 192.168.153.124/24 brd 192.168.153.255 scope global noprefixroute ens192
       valid_lft forever preferred_lft forever
    inet 192.168.153.111/32 scope global ens192
       valid_lft forever preferred_lft forever
    inet 192.168.153.110/32 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fea8:4211/64 scope link 
       valid_lft forever preferred_lft forever

发现VIP1成功漂移到LB2上

排错

k8s的repo有问题

issue：k8s的repo有问题

failure: repodata/repomd.xml from kubernetes: [Errno 256] No more mirrors to try.
https://mirrors.tuna.tsinghua.edu.cn/kubernetes/yum/repos/kubernetes-el7-/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found

Public key for db7cb5cb0b3f6875f54d10f02e625573988e3e91fd4fc5eef0b1876bb18604ad-kubernetes-cni-0.8.7-0.x86_64.rpm is not installed

fix：换源

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes Repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
enable=1
EOF

镜像拉取失败

issue：镜像拉取失败

  [ERROR ImagePull]: failed to pull image registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:v1.8.4: output: Error response from daemon: manifest for registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:v1.8.4 not found: manifest unknown: manifest unknown

fix：拉取其他源的镜像，打tag成指定需要的镜像

docker pull coredns/coredns:1.8.4
docker tag 8d147537fb7d registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:v1.8.4
docker images
REPOSITORY                                                                    TAG       IMAGE ID       CREATED        SIZE
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver            v1.22.0   838d692cbe28   3 weeks ago    128MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager   v1.22.0   5344f96781f4   3 weeks ago    122MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler            v1.22.0   3db3d153007f   3 weeks ago    52.7MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy                v1.22.0   bbad1636b30d   3 weeks ago    104MB
registry.cn-hangzhou.aliyuncs.com/google_containers/etcd                      3.5.0-0   004811815584   2 months ago   295MB
coredns/coredns                                                               1.8.4     8d147537fb7d   3 months ago   47.6MB
registry.cn-hangzhou.aliyuncs.com/google_containers/coredns                   v1.8.4    8d147537fb7d   3 months ago   47.6MB
registry.cn-hangzhou.aliyuncs.com/google_containers/pause                     3.5       ed210e3e4a5b   5 months ago   683kB

master NotReady

issue：cni网络未准备好

kubectl get nodes
NAME     STATUS     ROLES    AGE   VERSION
master   NotReady   master   18m   v1.18.0

fix：

查看pod状态

kubectl get pod -n kube-system
NAME                             READY   STATUS    RESTARTS   AGE
coredns-7ff77c879f-6l6g7         0/1     Pending   0          19m
coredns-7ff77c879f-fxjbm         0/1     Pending   0          19m

查看日志

kubectl logs -n kube-system -p coredns-7ff77c879f-6l6g7

无任何日志输出

查看/var/log/messages的日志

tail  /var/log/messages
Sep  2 22:18:28 master kubelet: W0902 22:18:28.358395   54235 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Sep  2 22:18:29 master kubelet: E0902 22:18:29.880901   54235 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized

查看事件

kubectl get events -n kube-system
LAST SEEN   TYPE      REASON              OBJECT                              MESSAGE
2m31s       Warning   FailedScheduling    pod/coredns-7ff77c879f-6l6g7        0/1 nodes are available: 1 node(s) had taint {node.kubernetes.io/not-ready: }, that the pod didn't tolerate.
2m27s       Warning   FailedScheduling    pod/coredns-7ff77c879f-fxjbm        0/1 nodes are available: 1 node(s) had taint {node.kubernetes.io/not-ready: }, that the pod didn't tolerate.

fix：部署CNI网络

Pod Status ContainerCreating

kubectl get po
NAME                         READY   STATUS              RESTARTS   AGE
nginx-869c7bb664-2fb98       1/1     Running             0          5m54s
nginx-869c7bb664-qlm56       0/1     ContainerCreating   0          5m54s

查看日志

kubectl logs  nginx-869c7bb664-qlm56
Error from server (BadRequest): container "nginx" in pod "nginx-869c7bb664-qlm56" is waiting to start: ContainerCreating

没有给出问题的根源

查看pod详细信息

 kubectl describe po nginx-869c7bb664-qlm56

 Warning  FailedMount  2m8s  kubelet, node3     MountVolume.SetUp failed for volume "nginx-data-pv" : mount failed: exit status 32

fix：挂载的volume同名了

需修改helm内容

nfs重复挂载

mount.nfs: Stale file handle

表示挂载到nfs服务器上的目录已经被挂载过

fix：取消此目录挂载

umount -f /mnt/nfsmount

wrong fs type, bad option, bad superblock on 192.168.153.129:/mnt/nfsmount

mount: wrong fs type, bad option, bad superblock on 192.168.153.129:/mnt/nfsmount,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

helm install nginx的时候出现此报错

issue：node节点上未安装nfs-utils

fix：安装nfs-utils

 yum install nfs-utils -y

这篇关于基于k8s的nginx双VIP高可用集群的文章就介绍到这儿，希望我们推荐的文章对大家有所帮助，也希望大家多多支持为之网！

基于k8s的nginx双VIP高可用集群

规划

k8s集群搭建

ansible配置

配置免密

修改主机名

允许 iptables 检查桥接流量

检查修改效果

安装docker

安装必要的一些系统工具

下载国内的源

安装docker

启动docker

配置docker

安装 kubeadm、kubelet 和 kubectl

初始化Master

初始化

开始集群

保留节点加入的命令

部署CNI网络

接入节点

NFS服务器搭建

安装 nfs 服务器所需的软件包

创建 exports 文件

启动 nfs 服务

检查配置是否生效

客户端测试NFS

检查nfs服务器端是否共享

挂载

测试是否挂载成功

部署nginx服务

安装helm

helm chart结构

helm chart内容

安装nginx

访问

反向代理

keepalived实现双vip

部署keepalived

安装keepalived

配置keepalived的参数

开启keepalived

查看两个LB服务器的ip

部署nginx

安装nginx

修改nginx配置

编写检测nginx存活脚本

Client访问vip的80端口

模拟LB1宕机

排错

k8s的repo有问题

镜像拉取失败

master NotReady

Pod Status ContainerCreating

nfs重复挂载

wrong fs type, bad option, bad superblock on 192.168.153.129:/mnt/nfsmount

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