关于k8s安装脚本方面的草稿

周六作的，

慢慢完善。

#! /usr/bin/env bash

set -e
set -u
set -x

#让此脚本可以重复执行，所以加了一些判断
#使用系统的PATH环境
export PATH=$(echo $PATH)

function iptables_clear() {
    #重置iptables
    iptables -P INPUT ACCEPT
    iptables -P FORWARD ACCEPT
    iptables -P OUTPUT ACCEPT
    iptables -t nat -P PREROUTING ACCEPT
    iptables -t nat -P POSTROUTING ACCEPT
    iptables -t nat -P OUTPUT ACCEPT
    iptables -t mangle -P PREROUTING ACCEPT
    iptables -t mangle -P OUTPUT ACCEPT
    iptables -F
    iptables -t nat -F
    iptables -t mangle -F
    iptables -X
    iptables -t nat -X
    iptables -t mangle -X
}
function root_init() {
    #停止firewall防火墙，并禁止开机自启动
    systemctl stop firewalld.service
    systemctl disable firewalld.service

    iptables_clear

    #禁止selinux安全
    sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
    sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/sysconfig/selinux
    set +e
    setenforce
    set -e

    #关闭swap交换内存，K8S强制的，不然安装会报错
    swapoff -a
    sed -i 's/.*swap.*/#&/' /etc/fstab

    # 安装工具及加载br_netfilter, ipvs
    yum install bridge-utils ipset ipvsadm -y

    modprobe br_netfilter
    modprobe -- ip_vs
    modprobe -- ip_vs_rr
    modprobe -- ip_vs_wrr
    modprobe -- ip_vs_sh
    modprobe -- nf_conntrack_ipv4
    modprobe -- nf_conntrack_ipv6

    ipvs_no=$(cat /etc/rc.local|grep ip_vs|wc -l)
     ]; then
        echo "modprobe br_netfilter" >> /etc/rc.local
        echo "modprobe -- ip_vs" >> /etc/rc.local
        echo "modprobe -- ip_vs_rr" >> /etc/rc.local
        echo "modprobe -- ip_vs_wrr" >> /etc/rc.local
        echo "modprobe -- ip_vs_sh" >> /etc/rc.local
        echo "modprobe -- nf_conntrack_ipv4" >> /etc/rc.local
        echo "modprobe -- nf_conntrack_ipv6" >> /etc/rc.local
    fi

    # 为k8s证书生成目录
    mkdir -p /etc/kubernetes/pki/etcd
    chown -R docker.docker /etc/kubernetes/pki
     /etc/kubernetes/pki

    #配置k8s内核参数
    k8s_kernel_conf=/etc/sysctl.d/k8s.conf
    if [ -e $k8s_kernel_conf ]; then
        rm -f $k8s_kernel_conf
    fi
    cat<<EOF>$k8s_kernel_conf
    net.ipv4.ip_forward =
    net.bridge.bridge-nf-call-ip6tables =
    net.bridge.bridge-nf-call-iptables =
    net.bridge.bridge-nf-call-arptables =
    vm.swappiness=
EOF

    #使配置生效
    sysctl -p
    sysctl --system

    #安装必须软件，将其cp到指定运行目录
    yum install conntrack-tools socat -y
    yum localinstall /tmp/*.rpm -y
    # tar xf cni-plugins-amd64-v0.7.5.tgz -C /opt/cni/bin
    /bin/cp /usr/bin/kube* /usr/local/bin/

    #所有服务都设置为开机自启动
    systemctl enable kubelet

    #配置docker用户可以命令行的相关命令
    k8s_sudoers_conf=/etc/sudoers.d/k8s_sudoers
    if [ -e $k8s_sudoers_conf ]
    then
        rm -f $k8s_sudoers_conf
    fi
    cat<<EOF>$k8s_sudoers_conf
    docker ALL=(ALL)NOPASSWD: /usr/local/bin/kubeadm, kubectl, kubelet, systemctl, service, iptables, ipvsadm, docker
EOF

    cat<<EOF>/etc/sysconfig/kubelet
    KUBELET_EXTRA_ARGS="--cgroup-driver=$DOCKER_CGROUPS --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
EOF
} 

function k8s_reset() {
    kubeadm reset
    ifconfig cni0 down
    ip link delete cni0
    ifconfig flannel.1 down
    ip link delete flannel.1
    rm -rf /var/lib/cni/
    iptables_clear
    ipvsadm -C
}