shrink_mem.sh

#!/usr/bin/env bash

# This file will create a cronjob that flushes kernel caches
# This is intended for with in VMs that support memory ballooning
# and will allow the hypervisor to reclaim memory

cat << 'EOF' >> /etc/cron.hourly/shrink_mem
#!/usr/bin/env bash

sync
echo 3 > /proc/sys/vm/drop_caches
EOF

chmod +x /etc/cron.hourly/shrink_mem

/etc/cron.hourly/shrink_mem