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Linux Concepts

Fixing DNS resolver issue:

readlink /etc/resolv.conf 
sudo rm -rf /etc/resolv.conf 
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

Clearing Memory cache ubuntu:

sync && echo 3 | sudo tee /proc/sys/vm/drop_caches

To do this every 15 mins add this is crontab by running sudo crontab -e

*/15 * * * * sync && echo 3 | sudo tee /proc/sys/vm/drop_caches