1. 安装 virtual box
版本：VirtualBox-6.1.42
2. 创建虚拟机，安装 centos7
新建虚拟机：
选择网络
安装 centos7 操作系统：
安装过程中配置网络
centos 安装完成后，需要修改 host-only 的网络参数
cd /etc/sysconfig/network-scripts/
vim ifcfg-enp0s8
文件内容如下：
1 TYPE=Ethernet 2 PROXY_METHOD=none 3 BROWSER_ONLY=no 4 BOOTPROTO=static 5 DEFROUTE=yes 6 IPV4_FAILURE_FATAL=no 7 IPV6INIT=yes 8 IPV6_AUTOCONF=yes 9 IPV6_DEFROUTE=yes 10 IPV6_FAILURE_FATAL=no 11 IPV6_ADDR_GEN_MODE=stable-privacy 12 NAME=enp0s8 13 UUID=6160c659-6e3d-4525-9628-dcb6cb9a946a 14 DEVICE=enp0s8 15 ONBOOT=yes 16 IPV6_PRIVACY=on 17 IPADDR=192.168.56.8 18 NETMASK=255.255.255.0 19 GATEWAY=192.168.56.1 20 ZONE=public
重启过后，在宿主机上可通过 ssh 连接到虚拟机，虚拟机网络全部配置完成。
3. 安装 docker
参考 https://yeasy.gitbook.io/docker_practice/install/centos
4. 安装 k8s
| 主机名 | ip | 角色 | os版本 |
| k8s-master | 192.168.56.7 | master | CentOS Linux release 7.9.2009 (Core) |
| k8s-node1 | 192.168.56.8 | worker | CentOS Linux release 7.9.2009 (Core) |
4.1 在2台服务器上配置好域名
4.2 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
4.3 关闭 SeLinux
setenforce 0 sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
4.4 关闭 swap
swapoff -a yes | cp /etc/fstab /etc/fstab_bak cat /etc/fstab_bak |grep -v swap > /etc/fstab
4.5 安装 nfs-utils
yum install -y nfs-utils
yum install -y wget
4.6 修改 /etc/sysctl.conf
创建 sys_config.sh 脚本，文件内容如下：
# 如果有配置，则修改 sed -i "s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g" /etc/sysctl.conf sed -i "s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g" /etc/sysctl.conf sed -i "s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.all.disable_ipv6.*#net.ipv6.conf.all.disable_ipv6=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.default.disable_ipv6.*#net.ipv6.conf.default.disable_ipv6=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.lo.disable_ipv6.*#net.ipv6.conf.lo.disable_ipv6=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.all.forwarding.*#net.ipv6.conf.all.forwarding=1#g" /etc/sysctl.conf # # echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.all.forwarding = 1" >> /etc/sysctl.conf # 执行命令 sysctl -p
执行脚本
chmod a+x sys_config.sh
./sys_config.sh
4.7 配置 k8s yum 源
vim k8s_yum.sh # k8s_yum.sh 文件内容 cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF chmod a+x ./k8s_yum.sh ./k8s_yum.sh
4.8 集群内所有机器上安装 kubelet, kubeadm, kubectl
yum install -y kubelet-1.18.20 kubeadm-1.18.20 kubectl-1.18.20
4.9 修改 docker cgroup driver 为 systemd
sed -i "s#^ExecStart=/usr/bin/dockerd.*#ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd#g" /usr/lib/systemd/system/docker.service
4.10 启动 kubelet
systemctl daemon-reload
systemctl restart docker
systemctl enable kubelet && systemctl start kubelet
4.11 初始化 master
kubeadm init \ --apiserver-advertise-address=192.168.56.7 \ --image-repository registry.aliyuncs.com/google_containers \ --kubernetes-version v1.18.20 \ --service-cidr=10.96.0.0/12 \ --pod-network-cidr=10.244.0.0/16
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
4.12 根据提示，将 node 节点加入集群
# 如果忘记 token，在 master 中执行命令可重新获取 kubeadm token create --print-join-command kubeadm join 192.168.56.7:6443 --token fhspoz.m0lztzh3tcnoarkc \ --discovery-token-ca-cert-hash sha256:5ee31f032672162d355219fc3f6923ae87fa27ddb7c831b1766fd6db2dea37b5
4.13 在 master 中安装 flannel
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml kubectl apply -f kube-flannel.yml
需要注意的是：如果集群内节点仍处于 notReady 状态，则检查 flannal 的网卡设置。
4.14 检查节点状态
