[Server Cleanup] The Centos7 server disk is full, how to clean it up, and what cleaning methods are available

How does the Centos server clean up the disk, what are the easiest ways

foreword

If the online server disk is full, but I dare not clear it easily, you can refer to the following solutions at this time;
Tip: The operator needs to have a link server and use commands to operate;

check disk full

# 输入以下命令，查看服务器硬盘，是否爆满，像当前这个服务器，磁盘占用 27%；
df -h

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Several ways to clean up

large file, delete

Retrieve the current system, files larger than 100M, and view them

 find / . -type f -size +100M

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After retrieval, please delete those files according to your needs;
if those files are unstable and you don’t know their purpose, please back up the snapshot before executing them;
for example, as follows

# 该命令不可胡乱使用，删除了 无法恢复
rm -rf /www/wwwroot/jar-prod/target/blade/log/info-2023-06-11.log

log clear

Check the current log files of the system and retrieve them; some servers have a lot of log files, so wait and take a look first;

find / -name *.log

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Like this server, there are too many logs. If you can’t read them, you don’t know which ones are needed or not; you can simply take a look and find the logs with time format;

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For example, if the log file has time, you can copy the path; Tip: For logs with time format, you can delete some appropriately
Execute the command:

#命令解析，查询某文件夹下的所有文件，修改时间低于当前时间3天
#也就是将大前天的文件之前的文件，进行删除
find /www/wwwroot/jar-dev/target/blade/log/ -mtime +2 -name "*" -exec rm -rf {
    
    } \;

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The path here: /www/wwwroot/jar-dev/target/blade/log/ You can adjust according to the log path you have obtained; you can sort out multiple log paths first, and make the sorted statement into a
script Set to timing processing;

The large memory file is deleted, but the memory is not released

The system will have a processing mechanism. When some large files are deleted, but the memory usage is still the same and cannot be released; you
can try the following command, only one is needed, which is the fastest;

# 找到未释放的，直接帮 kill -9 该进程
lsof | grep deleted | awk '{if (NR > 1){print $2}}'|uniq | xargs kill -9;