使用kubeadm安装k8s测试环境脚本

1.脚本内容

#!/bin/bash

MASTER='172.30.8.211'
MASTER_HOSTNAME='master'
NODE_LIST=(172.30.8.212-node1)
K8S_VERSION=1.24.9
NFS_SERVER=172.30.8.212
NFS_PATH=/data/nfs
HELM_VERSION=v3.12.1
SCRIPT_PATH=/usr/local/scripts



install_kernel(){
    #下载内核文件
    rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
    rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
    
    yum --enablerepo=elrepo-kernel install kernel-lt kernel-lt-devel -y
    #内核切换
    grub2-set-default 0
    kernel_version=`cat /boot/grub2/grub.cfg |egrep "^menuentry 'CentOS Linux"|awk -F"'" 'NR==1{print $2}'`
    grub2-set-default "${kernel_version}"
    grub2-editenv list
 }

update_kernel(){
    install_kernel
    for i in ${NODE_LIST[*]};do 
        ip=`echo $i|awk -F'-' '{print  $1}'`
        ssh root@${ip} "/usr/local/scripts/k8s_install.sh update_kernel && sleep 5 && reboot"
        
    done      
    reboot 
}


    

add_hosts(){
    echo "$MASTER $MASTER_HOSTNAME" >>/etc/hosts
    for i in ${NODE_LIST[*]};do
    node_hosts=`echo $i|sed "s/-/ /g"`
    echo $node_hosts >>/etc/hosts
    done
}


install_basics(){
    #修改内核参数
    echo net.bridge.bridge-nf-call-iptables = 1  >>/etc/sysctl.conf
    echo net.ipv4.ip_forward=1 >>/etc/sysctl.conf
    echo net.bridge.bridge-nf-call-iptables=1 >>/etc/sysctl.conf
    echo net.bridge.bridge-nf-call-ip6tables=1 >>/etc/sysctl.conf
    echo vm.swappiness=0 >>/etc/sysctl.conf
    sysctl -p
     
     
    #关闭swap
    #swapoff -a
    #sed -i '/swap/s/^/#/' /etc/fstab
     
     
    #关闭firewalld
    systemctl stop firewalld
    systemctl disable firewalld
    sed -i 's/=enforcing/=disabled/g' /etc/selinux/config
     
    #配置IPVS模块
cat >/etc/sysconfig/modules/ipvs.modules<<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
    chmod 755 /etc/sysconfig/modules/ipvs.modules
    bash /etc/sysconfig/modules/ipvs.modules
    lsmod | grep -e ip_vs -e nf_conntrack_ipv4
     
     
    #配置源
    cd /etc/yum.repos.d/
    wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
cat>/etc/yum.repos.d/kubrenetes.repo<<EOF
[kubernetes]
name=Kubernetes Repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
EOF
    yum makecache
     
    #安装containerd
    yum install -y containerd
     
    #配置containerd运行环境
cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
     
    sudo modprobe overlay
    sudo modprobe br_netfilter
    
    #配置containerd的config.toml文件
    containerd config default | sudo tee /etc/containerd/config.toml
    sed -ri 's#(sandbox_image = ")(registry.k8s.io)(.*)#\1registry.cn-hangzhou.aliyuncs.com/google_containers\3#g' /etc/containerd/config.toml
    sed -i "s/SystemdCgroup = false/SystemdCgroup = true/g"   /etc/containerd/config.toml
    #查看
    cat  /etc/containerd/config.toml |egrep     "sandbox_image|SystemdCgroup"
    
    
    #指定crictl的containerd端点
cat > /etc/crictl.yaml <<EOF
runtime-endpoint: unix:///var/run/containerd/containerd.sock
image-endpoint: unix:///var/run/containerd/containerd.sock
timeout: 0
debug: false
pull-image-on-create: false
EOF
    
    #启动containerd服务
    systemctl start containerd.service
    systemctl enable containerd.service
    
    yum install -y  nfs-utils
    #安装kubeadm等
    yum install  kubelet-$K8S_VERSION kubeadm-$K8S_VERSION kubectl-$K8S_VERSION -y
     
    #安装ipvs
    yum -y install ipvsadm ipset
     
    #启动kubelet
    systemctl enable kubelet && systemctl start kubelet
    
}

kuneadm_init(){
	kubeadm init  --kubernetes-version=v${K8S_VERSION} --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --image-repository='registry.cn-hangzhou.aliyuncs.com/google_containers' >/root/kubeadm-init.log
	###mkdir .kube
    mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config

}

kubeadm_join(){
    join_cmd=`tail -2 /root/kubeadm-init.log`
    for i in ${NODE_LIST[*]};do
        ip=`echo $i|awk -F'-' '{print  $1}'`
        ssh root@${ip} "${join_cmd}"
    done
}

install_nfs(){
	ssh root@${NFS_SERVER} "yum -y install nfs-utils rpcbind &&systemctl  start rpcbind.service &&systemctl  start nfs&& mkdir /data/nfs -p &&chown nfsnobody.nfsnobody /data/nfs && echo /data/nfs ${NFS_SERVER}\(rw,sync,no_root_squash,no_all_squash\)>> /etc/exports && exportfs  -arv"

}

master_install(){
    yum install -y git
    cd /root
    git clone https://gitee.com/zhang8042/k8s_file.git
    ##calico
	cd /root/k8s_file/calico
    kubectl  apply -f calico.yaml
    #nfs sc
    cd /root/k8s_file/nfs
    sed -i "s/10.10.10.60/${NFS_SERVER}/g" deployment.yaml
    sed -i "s#/ifs/kubernetes#${NFS_PATH}#g" deployment.yaml
    kubectl apply -f class.yaml
    kubectl  apply -f rbac.yaml
    kubectl  apply -f deployment.yaml
    kubectl  apply -f test-pvc.yaml
    #helm
    cd /root
    wget https://get.helm.sh/helm-${HELM_VERSION}-linux-amd64.tar.gz
    tar xf helm-${HELM_VERSION}-linux-amd64.tar.gz
    mv  linux-amd64/helm  /usr/local/bin/
    helm version
    helm repo add stable https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
    helm repo add kaiyuanshe http://mirror.kaiyuanshe.cn/    kubernetes/charts
    helm repo add azure http://mirror.azure.cn/kubernetes/charts
    helm repo add dandydev https://dandydeveloper.github.io/charts
    helm repo add bitnami https://charts.bitnami.com/bitnami
    helm repo list
    

}


server_init(){
    #hostname
    ssh root@${MASTER} "hostnamectl  set-hostname ${MASTER_HOSTNAME}"
    script_file=`pwd`/$0
    for i in ${NODE_LIST[*]};do
        ip=`echo $i|awk -F'-' '{print  $1}'`
        name=`echo $i|awk -F'-' '{print  $2}'`
        ssh root@${ip} "hostnamectl  set-hostname ${name}"
        ssh root@${ip} "mkdir -p ${SCRIPT_PATH}"
        scp $script_file root@${ip}:${SCRIPT_PATH}/k8s_install.sh
        ssh root@${ip} "chmod +x ${SCRIPT_PATH}/k8s_install.sh "
        ssh root@${ip} "${SCRIPT_PATH}/k8s_install.sh add_hosts"
    done
    add_hosts
    update_kernel
}

install_k8s(){
	install_basics
        for i in ${NODE_LIST[*]};do
            ip=`echo $i|awk -F'-' '{print  $1}'`
            ssh root@${ip} "${SCRIPT_PATH}/k8s_install.sh install_basics"
        done
	kuneadm_init

}



case $1 in
    init)
      server_init
      ;;
    install)
      install_k8s
      kubeadm_join
      install_nfs
      master_install
      ;;
    update_kernel)
      install_kernel
      ;;
    install_basics)
      install_basics
      ;;
    add_hosts)
      add_hosts
      ;;
    *)
      echo "input error"
      ;;
esac

2. 脚本使用

2.1 升级内核

```
bash k8s_install.sh init
```

2.2 k8s集群安装

bash k8s_install.sh  install

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