kazulog@sv1:~$ echo 'vm.swappiness = 30' | sudo tee /etc/sysctl.d/10-kazulog-test.conf
vm.swappiness = 30
kazulog@sv1:~$ grep -H . /etc/sysctl.d/10-kazulog-test.conf /etc/sysctl.d/99-kazulog.conf
/etc/sysctl.d/10-kazulog-test.conf:vm.swappiness = 30
/etc/sysctl.d/99-kazulog.conf:vm.swappiness = 10
/etc/sysctl.d/99-kazulog.conf:net.core.somaxconn = 1024
kazulog@sv1:~$ sudo sysctl --system 2>&1 | grep -E 'kazulog|swappiness'
* Applying /etc/sysctl.d/10-kazulog-test.conf ...
* Applying /etc/sysctl.d/99-kazulog.conf ...
vm.swappiness = 30
vm.swappiness = 10
kazulog@sv1:~$ sysctl vm.swappiness
vm.swappiness = 10
kazulog@sv1:~$ sudo rm /etc/sysctl.d/10-kazulog-test.conf