Centos 7 turn off NetworkManager

Centos 7 turn off NetworkManager

My domain whittenberg.domain and my machine is nas.whittenberg.domain

Do not attempt this unless you have console access. You can do all the below from a say a putty session, but if things go wrong you will need console access.

vi /etc/hostname
    nas.whittenberg.domain

vi /etc/hosts
    127.0.0.1   nas nas.whittenberg.domain localhost localhost.localdomain localhost4 localhost4.localdomain4
     ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

   
vi /etc/resolv.conf
        # Generated by NetworkManager
        search whittenberg.domain
        nameserver 192.168.10.1
        nameserver 2600:8800:2580:eda:4af8:b3ff:fe93:615d

---begin if you want to use the old eth0 naming convention       
       
vi /etc/default/grub
 
Search for the line “GRUB_CMDLINE_LINUX” and append the following: 

“net.ifnames=0 biosdevname=0″

**copy/paste from this blog sometimes leaves incorrect " in the linux file. Please type those in manually from your kyb. Also make sure you do not have to many quotes in the file. The line should begin and end in a quote. If you have any in the middle it will fail.

grub2-mkconfig -o /boot/grub2/grub.cfg

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

**above is used if you have EFI boot    
 
mv /etc/sysconfig/network-scripts/ifcfg-enp3s0 /etc/sysconfig/network-scripts/ifcfg-eth0   

vi /etc/sysconfig/network-scripts/ifcfg-eth0

    NAME=eth0
    DEVICE=eth0

---end if you want to use the old eth0 naming convention

systemctl stop NetworkManager
systemctl disable NetworkManager
systemctl stop NetworkManager-wait-online
systemctl disable NetworkManager-wait-online
systemctl enable network
chkconfig network on
systemctl start network

reboot and sanity check

systemctl status NetworkManager
systemctl status network