kubernetes集群编排（13）

目录

k8s高可用集群

haproxy负载均衡

pacemaker高可用

部署control-plane

[部署worker node](#部署worker node)

---

k8s高可用集群

实验环境

|------|---------------|-------------------|
| 主机名 | IP | 角色 |
| k8s1 | 192.168.81.10 | harbor |
| k8s2 | 192.168.81.11 | control-plane |
| k8s3 | 192.168.81.12 | control-plane |
| k8s4 | 192.168.81.13 | control-plane |
| k8s5 | 192.168.81.14 | haproxy,pacemaker |
| k8s6 | 192.168.81.15 | haproxy,pacemaker |
| k8s7 | 192.168.81.16 | worker node |

haproxy负载均衡

配置节点解析，所有节点解析保持一致

[root@k8s5 ~]# yum install -y haproxy net-tools
[root@k8s5 ~]# cd /etc/haproxy/
[root@k8s5 haproxy]# vim haproxy.cfg

#---------------------------------------------------------------------
defaults
    mode                    http
    log                     global
    #option                  httplog
    option                  dontlognull
    option http-server-close
    #option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000

listen status *:80			#监控
        stats uri /status
        stats auth admin:westos
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  main *:6443
    mode tcp
    default_backend             k8s

#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend k8s
    mode tcp
    balance     roundrobin
    server  app1 192.168.81.11:6443 check
    server  app2 192.168.81.12:6443 check
    server  app3 192.168.81.13:6443 check

注意：需要修改为自己的k8s control-plane地址

[root@k8s5 haproxy]# systemctl  start haproxy

访问监控页面：http://192.168.81.14/status

admin/westos

测试成功后关闭服务，不要设置自启动

[root@k8s5 haproxy]# systemctl  stop haproxy

设置免密

[root@k8s5 haproxy]# ssh-keygen
[root@k8s5 haproxy]# ssh-copy-id k8s6

k8s6节点安装haproxy软件

[root@k8s6 ~]# yum install -y haproxy

从k8s5拷贝配置文件

[root@k8s5 haproxy]# scp haproxy.cfg  k8s6:/etc/haproxy/

pacemaker高可用

同步配置文件

[root@k8s5 ~]# cd /etc/yum.repos.d/
[root@k8s5 yum.repos.d]# vim dvd.repo
[dvd]
name=rhel7.6
baseurl=file:///media
gpgcheck=0

[HighAvailability]
name=rhel7.6 HighAvailability
baseurl=file:///media/addons/HighAvailability
gpgcheck=0

[root@k8s5 yum.repos.d]# scp dvd.repo  k8s6:/etc/yum.repos.d/

安装软件

[root@k8s5 ~]# yum install  -y pacemaker pcs psmisc policycoreutils-python
[root@k8s6 ~]# yum install  -y pacemaker pcs psmisc policycoreutils-python

启动pcsd服务

[root@k8s5 ~]# systemctl enable --now pcsd.service
[root@k8s5 ~]# ssh k8s6 systemctl enable --now pcsd.service

设置用户密码

[root@k8s5 ~]# echo westos | passwd --stdin hacluster
[root@k8s5 ~]# ssh k8s6 'echo westos | passwd --stdin hacluster'

节点认证

[root@k8s5 ~]# pcs cluster auth k8s5 k8s6
Username: hacluster
Password: westos

创建集群

[root@k8s5 ~]# pcs cluster setup --name mycluster k8s5 k8s6

启动集群

[root@k8s5 ~]# pcs cluster start --all

集群自启动

[root@k8s5 ~]# pcs cluster enable --all

禁用stonith

[root@k8s5 ~]# pcs property set stonith-enabled=false

添加集群资源

[root@k8s5 ~]# pcs resource create vip ocf:heartbeat:IPaddr2 ip=192.168.81.200 op monitor interval=30s        //创建一个 IPaddr2 类型的资源 vip，其 IP 地址为 192.168.81.200，监测间隔为 30 秒
[root@k8s5 ~]# pcs resource create haproxy systemd:haproxy op  monitor interval=60s        //创建一个 systemd 类型的资源 haproxy，用于启动 HAProxy 服务，监测间隔为 60 秒
[root@k8s5 ~]# pcs resource group add hagroup vip haproxy        //将前两个资源添加到一个资源组 hagroup 中

测试

[root@k8s5 ~]# pcs node standby

资源全部迁移到k8s6

恢复

[root@k8s5 ~]# pcs node  unstandby

部署control-plane

重置节点

[root@k8s2 ~]# kubeadm reset
[root@k8s2 ~]# cd /etc/cni/net.d
[root@k8s2 net.d]# rm -rf *

k8s3、k8s4以此类推
加载内核模块（在所有集群节点执行）

[root@k8s2 ~]# vim /etc/modules-load.d/k8s.conf
overlay
br_netfilter
[root@k8s2 ~]# modprobe overlay
[root@k8s2 ~]# modprobe br_netfilter

[root@k8s2 ~]# vim /etc/sysctl.d/docker.conf
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
net.ipv4.ip_forward=1
[root@k8s2 ~]# sysctl --system

确认软件版本

[root@k8s2 ~]# rpm -q kubeadm kubelet kubectl

生成初始化配置文件

[root@k8s2 ~]# kubeadm config print init-defaults > kubeadm-init.yaml

修改配置

[root@k8s2 ~]# vim kubeadm-init.yaml
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.81.11			#本机ip
  bindPort: 6443
nodeRegistration:
  criSocket: unix:///var/run/containerd/containerd.sock		
  imagePullPolicy: IfNotPresent
  name: k8s2								#本机主机名
  taints: null
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta3
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: "192.168.81.200:6443"	#负载均衡地址
controllerManager: {}
dns: {}
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: reg.westos.org/k8s			#本地私有仓库
kind: ClusterConfiguration
kubernetesVersion: 1.25.0
networking:
  dnsDomain: cluster.local
  serviceSubnet: 10.96.0.0/12
  podSubnet: 10.244.0.0/16					#pod分配地址段
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs								#配置ipvs模式

初始化集群

[root@k8s2 ~]# kubeadm init   --config kubeadm-init.yaml --upload-certs

部署网路插件

[root@k8s2 calico]# kubectl apply -f calico.yaml

添加其它control-plane节点

[root@k8s3 containerd]# kubeadm join 192.168.81.200:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:1142c506bc44c57b7c38487a5f348b73f1eb6a19a28ab44efde287d811ad1bc2 \
        --control-plane --certificate-key b8feb02bce9fa4fea5676265438ec505fcc2f14501584cc938ed08684bc8c8a7

[root@k8s4 containerd]# kubeadm join 192.168.81.200:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:1142c506bc44c57b7c38487a5f348b73f1eb6a19a28ab44efde287d811ad1bc2 \
        --control-plane --certificate-key b8feb02bce9fa4fea5676265438ec505fcc2f14501584cc938ed08684bc8c8a7

指定 Kubernetes 的配置文件路径为 /etc/kubernetes/admin.conf

export KUBECONFIG=/etc/kubernetes/admin.conf

部署worker node

新添加的节点需要初始化配置

1. 禁用selinux、firewalld、swap分区
2. 部署containerd
3. 安装kubelet、kubeadm、kubectl
4. 配置内核模块

禁用swap

[root@k8s7 ~]# swapoff -a
[root@k8s7 ~]# vim /etc/fstab

安装containerd、kubelet、kubeadm、kubectl

从其它节点拷贝repo文件

[root@k8s4 yum.repos.d]# scp k8s.repo docker.repo  k8s7:/etc/yum.repos.d/

安装软件

[root@k8s7 yum.repos.d]# yum install -y containerd.io kubeadm-1.24.17-0 kubelet-1.24.17-0 kubectl-1.24.17-0

自启动服务

[root@k8s7 ~]# systemctl enable --now containerd
[root@k8s7 ~]# systemctl enable --now kubelet

拷贝containerd的配置文件

[root@k8s4 containerd]# scp -r * k8s7:/etc/containerd/

重启服务

[root@k8s7 containerd]# systemctl  restart containerd
[root@k8s7 containerd]# crictl config runtime-endpoint unix:///run/containerd/containerd.sock
[root@k8s7 containerd]# crictl pull myapp:v1

配置内核模块

[root@k8s4 containerd]# cd /etc/modules-load.d/
[root@k8s4 modules-load.d]# scp k8s.conf k8s7:/etc/modules-load.d/
[root@k8s4 modules-load.d]# cd /etc/sysctl.d/
[root@k8s4 sysctl.d]# scp docker.conf k8s7:/etc/sysctl.d/

[root@k8s7 ~]# modprobe overlay
[root@k8s7 ~]# modprobe br_netfilter
[root@k8s7 ~]# sysctl --system

[root@k8s7 ~]# kubeadm join 192.168.81.200:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:1142c506bc44c57b7c38487a5f348b73f1eb6a19a28ab44efde287d811ad1bc2

添加worker标签

[root@k8s2 ~]# kubectl label node k8s7 node-role.kubernetes.io/woker=