mirror of
https://github.com/yyhuni/xingrin.git
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98 lines
2.7 KiB
Bash
Executable File
98 lines
2.7 KiB
Bash
Executable File
#!/bin/bash
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#
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# Ubuntu/Debian 一键开启交换分区脚本
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# 用法: sudo ./setup-swap.sh [大小GB]
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# 示例: sudo ./setup-swap.sh 4 # 创建 4GB 交换分区
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# sudo ./setup-swap.sh # 默认创建与内存相同大小的交换分区
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#
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set -e
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# 颜色定义
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[1;33m'
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NC='\033[0m'
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log_info() { echo -e "${GREEN}[INFO]${NC} $1"; }
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log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
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log_error() { echo -e "${RED}[ERROR]${NC} $1"; }
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# 检查 root 权限
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if [ "$EUID" -ne 0 ]; then
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log_error "请使用 sudo 运行此脚本"
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exit 1
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fi
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# 检查是否已有交换分区
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CURRENT_SWAP_KB=$(grep SwapTotal /proc/meminfo | awk '{print $2}')
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CURRENT_SWAP_GB=$(awk "BEGIN {printf \"%.0f\", $CURRENT_SWAP_KB / 1024 / 1024}")
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if [ "$CURRENT_SWAP_GB" -gt 0 ]; then
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log_warn "系统已有 ${CURRENT_SWAP_GB}GB 交换分区"
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swapon --show
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read -p "是否继续添加新的交换分区？(y/N) " -r
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if [[ ! $REPLY =~ ^[Yy]$ ]]; then
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log_info "已取消"
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exit 0
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fi
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fi
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# 获取系统内存大小（GB，四舍五入）
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TOTAL_MEM_KB=$(grep MemTotal /proc/meminfo | awk '{print $2}')
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TOTAL_MEM_GB=$(awk "BEGIN {printf \"%.0f\", $TOTAL_MEM_KB / 1024 / 1024}")
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# 确定交换分区大小
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if [ -n "$1" ]; then
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SWAP_SIZE_GB=$1
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else
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# 默认与内存相同，最小 1GB，最大 8GB
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SWAP_SIZE_GB=$TOTAL_MEM_GB
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[ "$SWAP_SIZE_GB" -lt 1 ] && SWAP_SIZE_GB=1
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[ "$SWAP_SIZE_GB" -gt 8 ] && SWAP_SIZE_GB=8
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fi
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SWAP_FILE="/swapfile_xingrin"
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log_info "系统内存: ${TOTAL_MEM_GB}GB"
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log_info "将创建 ${SWAP_SIZE_GB}GB 交换分区: $SWAP_FILE"
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# 检查磁盘空间（向下取整，保守估计）
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AVAILABLE_GB=$(df / | tail -1 | awk '{printf "%.0f", $4/1024/1024}')
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if [ "$AVAILABLE_GB" -lt "$SWAP_SIZE_GB" ]; then
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log_error "磁盘空间不足！可用: ${AVAILABLE_GB}GB，需要: ${SWAP_SIZE_GB}GB"
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exit 1
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fi
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# 创建交换文件
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log_info "正在创建交换文件（可能需要几分钟）..."
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dd if=/dev/zero of=$SWAP_FILE bs=1G count=$SWAP_SIZE_GB status=progress
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# 设置权限
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chmod 600 $SWAP_FILE
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# 格式化为交换分区
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mkswap $SWAP_FILE
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# 启用交换分区
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swapon $SWAP_FILE
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# 添加到 fstab（开机自动挂载）
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if ! grep -q "$SWAP_FILE" /etc/fstab; then
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echo "$SWAP_FILE none swap sw 0 0" >> /etc/fstab
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log_info "已添加到 /etc/fstab，开机自动启用"
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fi
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# 优化 swappiness（降低交换倾向，优先使用内存）
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SWAPPINESS=10
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if ! grep -q "vm.swappiness" /etc/sysctl.conf; then
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echo "vm.swappiness=$SWAPPINESS" >> /etc/sysctl.conf
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fi
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sysctl vm.swappiness=$SWAPPINESS >/dev/null
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log_info "交换分区创建成功！"
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echo ""
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echo "当前交换分区状态:"
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swapon --show
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echo ""
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free -h
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