kubernetes-搭建之环境初始化

三、Kubernetes搭建环境初始化

⛳环境配置

VMWare NET模式

一、初始化环境

☑️ 设置主机名：hostnamectl set-hostname anyu967master1 && bash

☑️ VMware克隆改UUID：uuidgen 命令; nmcli connection show; nmcli device show ens33

☑️ 域名解析：vim /etc/hosts

☑️ 配置免密登录：ssh-keygen ssh-copy-id -i ~/.ssh/id_rsa.pub hostname 或者 user@ip

☑️ 关闭swap：swapoff -a vim /etc/fstab 克隆的虚拟机需删除UUID

☑️ 修改内核参数：

• modprobe br_netfilter lsmod |grep br_netfilter

• vim /etc/sysctl.d/k8s.conf

  cat > /etc/sysctl.d/k8s.conf <<EOF
  net.bridge.bridge-nf-call-ip6tables = 1
  net.bridge.bridge-nf-call-iptables = 1
  net.ipv4.ip_forward = 1
  EOF
  sysctl -p /etc/sysctl.d/k8s.conf
  

☑️ 配置防火墙：

systemctl stop firewalld && systemctl disable firewalld
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config

☑️ 配置yum源：

# CentOS-Base.repo
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

# epel.repo
wget -O /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo

# docker-ce.repo
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# install
sudo yum -y install wget net-tools nfs-utils lrzsz gcc gcc-c++ make cmake libxml2-devel openssl-devel curl curl-devel unzip sudo ntp libaio-devel wget vim ncurses-devel autoconf automake zlib-devel python-devel epel-release openssh-server socat ipvsadm conntrack ntpdate yum-utils device-mapper-persistent-data lvm2

# kubernetes.repo
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

setenforce 0
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet

☑️ 时间同步：yum install ntpdate -y; ntpdate cn.pool.ntp.org; * */1 * * * /usr/sbin/ntpdate cn.pool.ntp.org

☑️ 开启ipvs（IP Virtual Server）：

# IPVS基本上是一种高效的Layer-4交换机，它提供负载平衡的功能。
# https://www.cnblogs.com/hongdada/p/9758939.html
# ipvs 和 iptables 基于netfilter实现的，ipvs采用hash
  # 1、ipvs为大型集群提供了更好的可扩展性和性能；
  # 2、ipvs 支持比 iptables更复杂的负载均衡算法（rr-轮询调度、lc-最小连接数、dh-目标哈希、sh-源哈希、sed-最短期望延迟、nq-不排队调度）
  # 3、ipvs 支持服务器健康检查和连接重试等

/etc/sysconfig/modules
#!/bin/sh
ipvs_mdules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack"
for kernel_module in ${ipvs_modules}; do
    /sbin/modinfo -F filename ${kernel_module} >/dev/null 2>&1
    if [ 0 -eq 0 ]; then
        /sbin/modprobe ${kernel_module}
    fi
done

☑️ 安装iptables：yum install iptables-services -y systemctl stop iptables && systemctl disable iptables iptables -F

☑️ 安装docker 服务： Docker