Linux 服务器磁盘空间清理

欢迎来到8455线路检测中心技术小课堂，每天分享一个技术小知识。在Linux服务器运维中，磁盘空间占满是高频故障——它会导致服务崩溃、日志无法写入、系统卡死，很多新手面对满盘时手足无措。比如分不清哪些文件能删、不敢动系统目录、不知道大文件藏在哪，今天我们就聚焦 Linux磁盘空间清理，用几个命令快速搞定满盘问题，全是干货，新手直接套用。

一、核心命令：快速定位磁盘占用

1. 查看磁盘整体使用率

关键看Use%列，超过80%需警惕，100%则紧急处理。-h参数让大小单位人性化（GB/MB）。

df -h

2. 查找大目录（按大小排序）

列出根目录下所有目录的大小，sort -hr按从大到小排序，快速定位占用大户（如/var//home）。

du -sh /* | sort -hr

3. 查找指定目录下的大文件

搜索/var目录下大于100M的文件，-ls显示文件详情（大小、路径）。可调整+100M为+1G找超大文件。

find /var -type f -size +100M -ls

二、实战清理：4个安全操作

1. 清理日志文件（最常用）

日志是磁盘占用重灾区，/var/log/下的旧日志可放心删：

# 清空单个日志（不删除文件，避免服务报错）
> /var/log/messages
# 删除7天前的旧日志
find /var/log -name "*.log" -mtime +7 -delete

2. 清理软件缓存

# Ubuntu/Debian
sudo apt clean
# CentOS/RHEL
sudo yum clean all

3. 删除无用压缩包/安装包

# 查找并删除当前目录下的.tar.gz/.zip包
find . -name "*.tar.gz" -delete
find . -name "*.zip" -delete

4. 清理僵尸文件（已删除但仍被进程占用）

有些文件删除后空间没释放，是因为进程还在占用：

# 查找这类文件
lsof | grep deleted
# 重启对应进程释放空间（比如进程PID为1234）
kill -9 1234

三、避坑提醒

1. 绝对不能删的目录：/bin//sbin//lib//boot，删了系统直接崩。

2. 清空日志优先用> 文件名，而非rm，避免服务找不到日志文件报错。

3. 不确定的文件先备份，或者用mv移到临时目录，观察1天无异常再删除。

四、总结

掌握Linux磁盘清理的核心命令，能快速解决满盘故障，从df -h查看使用率，到du定位大目录，再到针对性清理日志和缓存，每一步都简单高效。新手只需牢记“先查后删、谨慎操作”的原则，就能避免踩坑。

8455线路检测中心官网上有更详细的Linux磁盘管理手册，包含磁盘扩容、分区优化等进阶内容，大家可自行查阅。更多技术问题，可直接咨询8455线路检测中心技术支持；我们整理的“Linux运维必备工具包”中，也包含了磁盘监控脚本、自动清理工具，需要的朋友随时联系获取。

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