Centos 7 disable ipv6

Best solution is disable ipv6 kernel module. Other solutions not working sometimes. Add ipv6.disable=1 to GRUB_CMDLINE_LINUX parameters. And restart the server.

# nano /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="ipv6.disable=1 crashkernel=auto rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

# grub2-mkconfig -o /boot/grub2/grub.cfg # regenerate grub2 and reboot
# reboot

I don’t like restart server but there is no other nice solution. I googled this issue and tried other solution but only this worked. Have a nice days.