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#!/bin/bash
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set -euo pipefail
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# 初始化变量
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ACTION=""
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VIP=""
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PRIORITY=150
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INTERFACE=""
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KEEPALIVED_CONF="/etc/keepalived/keepalived.conf"
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CHECK_SCRIPT="/usr/local/bin/check_haproxy.sh"
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# 打印帮助信息
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usage() {
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echo "用法: $0 [操作] [选项]"
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echo "操作:"
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echo " --install 安装并配置keepalived"
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echo " --uninstall 卸载keepalived并清理配置"
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echo "安装选项:"
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echo " --vip <VIP> 必选，虚拟IP（格式:192.168.1.100/24）"
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echo " --priority <数值> 可选，优先级（默认150，主节点设高）"
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echo "示例:"
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echo " 安装主节点: $0 --install --vip 192.168.1.100/24 --priority 150"
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echo " 安装备节点: $0 --install --vip 192.168.1.100/24 --priority 140"
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echo " 卸载: $0 --uninstall"
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exit 1
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}
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# 解析参数
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--install|--uninstall)
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ACTION="$1"
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shift
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;;
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--vip)
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VIP="$2"
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shift 2
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;;
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--priority)
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PRIORITY="$2"
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shift 2
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;;
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*)
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echo "错误：未知参数 $1"
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usage
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;;
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esac
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done
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# 校验操作参数
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if [[ -z "$ACTION" ]]; then
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echo "错误：必须指定 --install 或 --uninstall"
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usage
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fi
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# 检查root权限
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if [[ $EUID -ne 0 ]]; then
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echo "错误：脚本必须以root权限运行（使用sudo）"
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exit 1
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fi
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# 获取默认网卡
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get_default_interface() {
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INTERFACE=$(ip -br link show | grep -v LOOPBACK | awk '{print $1}' | head -n 1)
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if [[ -z "$INTERFACE" ]]; then
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echo "错误：无法获取默认网卡，请手动检查网络接口"
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exit 1
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fi
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echo "使用默认网卡：$INTERFACE"
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}
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# 安装keepalived
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install_keepalived() {
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# 校验安装参数
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if [[ -z "$VIP" ]]; then
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echo "错误：安装必须指定 --vip（格式:IP/子网掩码）"
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usage
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fi
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if ! [[ "$VIP" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/[0-9]+$ ]]; then
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echo "错误：VIP格式无效（正确格式：192.168.1.100/24）"
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exit 1
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fi
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# 获取网卡
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get_default_interface
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# 安装软件
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echo "===== 开始安装keepalived ====="
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apt update >/dev/null
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apt install -y keepalived >/dev/null || { echo "keepalived安装失败"; exit 1; }
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# 备份原有配置（若存在）
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if [[ -f "$KEEPALIVED_CONF" ]]; then
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mv "$KEEPALIVED_CONF" "${KEEPALIVED_CONF}.bak.$(date +%F_%H%M%S)"
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echo "已备份原有配置文件"
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fi
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# 创建健康检查脚本
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echo "创建健康检查脚本..."
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cat > "$CHECK_SCRIPT" << 'EOF'
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#!/bin/bash
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if ! pgrep -x "haproxy" >/dev/null; then
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systemctl stop keepalived
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exit 1
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else
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exit 0
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fi
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EOF
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chmod +x "$CHECK_SCRIPT"
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# 生成配置文件
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echo "生成keepalived配置..."
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cat > "$KEEPALIVED_CONF" << EOF
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global_defs {
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router_id LVS_K8S_$(hostname)
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}
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vrrp_script check_haproxy {
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script "$CHECK_SCRIPT"
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interval 2
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weight -20
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}
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vrrp_instance VI_1 {
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state $(if [[ $PRIORITY -ge 150 ]]; then echo "MASTER"; else echo "BACKUP"; fi)
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interface $INTERFACE
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virtual_router_id 51
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priority $PRIORITY
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advert_int 1
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authentication {
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auth_type PASS
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auth_pass k8s_ha_auth_2024
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}
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virtual_ipaddress {
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$VIP
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}
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track_script {
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check_haproxy
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}
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}
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EOF
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# 启动服务
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systemctl enable --now keepalived
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if systemctl is-active --quiet keepalived; then
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echo "===== keepalived安装完成 ====="
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echo "VIP：$VIP"
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echo "优先级：$PRIORITY"
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echo "网卡：$INTERFACE"
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else
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echo "错误：keepalived启动失败，请查看日志 journalctl -u keepalived"
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exit 1
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fi
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}
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# 卸载keepalived
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uninstall_keepalived() {
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echo "===== 开始卸载keepalived ====="
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# 停止服务
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if systemctl is-active --quiet keepalived; then
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systemctl stop keepalived
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echo "已停止keepalived服务"
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fi
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# 卸载软件
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if dpkg -l keepalived &>/dev/null; then
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apt purge -y keepalived >/dev/null
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apt autoremove -y >/dev/null
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echo "已卸载keepalived软件包"
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else
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echo "keepalived未安装，跳过卸载"
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fi
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# 清理配置文件（保留备份提示）
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if [[ -d /etc/keepalived/ ]]; then
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mv /etc/keepalived/ "/etc/keepalived.bak.$(date +%F_%H%M%S)"
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echo "配置文件已备份至 /etc/keepalived.bak.xxx"
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fi
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# 清理健康检查脚本
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if [[ -f "$CHECK_SCRIPT" ]]; then
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rm -f "$CHECK_SCRIPT"
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echo "已删除健康检查脚本"
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fi
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echo "===== keepalived卸载完成 ====="
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}
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# 执行操作
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case "$ACTION" in
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--install)
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install_keepalived
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;;
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--uninstall)
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uninstall_keepalived
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;;
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*)
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usage
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;;
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esac
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