PSJoshi/clear-ram-swap.md

## clear-ram-swap.md

      
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              clear-ram-swap.md
            
          
    Clear RAM-cache and Swap in Linux

It is possible to clear cache without interrupting any process or service. sync will flush the file system buffer and
drop_cache will clean cache without killing any application/service.
Clear PageCache only

# sync; echo 1 > /proc/sys/vm/drop_caches

Clear inodes

# sync; echo 2 > /proc/sys/vm/drop_caches

Clear both (it's not recommended on production!)

# sync; echo 3 > /proc/sys/vm/drop_caches


clear swap

# swapoff -a && swapon -a


clearcache.sh

#!/bin/bash
echo "echo 1 > /proc/sys/vm/drop_caches" && swapoff -a && swapon -a && printf '\n Ram-cache and Swap cleared'

Add executable permission
chmod 755 clearcache.sh

Add cron job
crontab -l > cron_backup
echo "0 10 * * * sudo /home/<user>/clearcache.sh >/dev/null 2>&1" >> cron_backup
crontab cron_backup
rm cron_backup