FLUSH cache linux

Empty Linux Buffer Cache:

There are three options available to flush cache of linux memeory. Use one of below as per your requirements.

1. To free pagecache, dentries and inodes in cache memory

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

2. To free dentries and inodes use following command

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

3. To free pagecache only use following command

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

adding to cron job for regular flush/ hour

# crontab -e
0 * * *  * sync; echo 3 > /proc/sys/vm/drop_caches

Check cache linux used

# free -m