FTP Server, Varnish Cache Server & Nginx Reverse Proxy won't start..

Hi,

I noticed these three were down and tried to restart them with no luck.
FTP Server, Varnish Cache Server & Nginx Reverse Proxy.

I Googled "Can't open PID file /var/run/pure-ftpd.pid (yet?) after start: Too many levels of symbolic links"

And found this post: https://forum.centos-webpanel.com/centos-7-problems/i-can't-start-ftp-server/

Following the above tutorial and trying to update the kernel but got stuck at nano /etc/default/grub

Error opening terminal: Unknown

And cat /etc/default/grub

There's no grub file at  /etc/default/

Any help appreciated


I ran these commands:

rpm --import http://www.elrepo.org/RPM-GPG-KEY-elrepo.org

rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm

yum --enablerepo=elrepo-kernel install kernel-ml -y

nano /etc/default/grub