Kernel parameters are not changed permanently for RHEL7

Trying to permanently change some vm kernel parameters, I created /etc/sysctl.d/01-custom.conf config file as it described in Red Hat knowledgebase article. Here is its content: # cat /etc/sysctl.d/01-custom.conf vm.swappiness=10 vm.dirty_ratio=20 vm.vfs_cache_pressure=200 But after reboot only vm.vfs_cache_pressure is changed and swappines and dirty_ratio have previous values. # sysctl vm.swappiness vm.swappiness = 30 # sysctl vm.dirty_ratio vm.dirty_ratio = 30 In /etc/sysctl.conf file there is no changes for vm.dirty_ratio parameter and vm.swappines is set to 10 as well. Does it mean that the system takes these values from somewhere else? There are no any config files under /etc/sysctl.d besides mine and link to /etc/sysctl.conf: # ll /etc/sysctl.d/ total 4 -rw-r--r-- 1 root root 147 May 30 04:40 01-custom.conf lrwxrwxrwx. 1 root root 14 Apr 3 15:00 99-sysctl.conf -> ../sysctl.conf **Update:** sysctl --system shows that values from my config were taken. Nothing for vm.swappines and vm.dirty_ratio are set to 30.