• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

The Geek Diary

CONCEPTS | BASICS | HOWTO

  • OS
    • Linux
    • CentOS/RHEL
    • Solaris
    • Oracle Linux
    • Linux Services
    • VCS
  • Database
    • oracle
    • oracle 12c
    • ASM
    • mysql
    • MariaDB
    • Data Guard
  • DevOps
    • Docker
    • Shell Scripting
  • Interview Questions
  • Big Data
    • Hadoop
    • Cloudera
    • Hortonworks HDP

How to disable NetworkManager on CentOS / RHEL 7

By admin

Disabling NetworkManager

The following steps will disable NetworkManager service and allows the interface to be managed only by network service.

1. To check which are the interfaces managed by NetworkManager

# nmcli device status

This displays a table that lists all network interfaces along with their STATE. If Network Manager is not controlling an interface, its STATE will be listed as unmanaged. Any other value indicates the interface is under Network Manager control.

2. Stop the NetworkManager service:

# systemctl stop NetworkManager

3. Disable the service permanently:

# systemctl disable NetworkManager

4. To confirm the NetworkManager service has been disabled

# systemctl list-unit-files | grep NetworkManager

5. Add the below parameter in /etc/sysconfig/network-scripts/ifcfg-ethX of interfaces that are managed by NetworkManager to make it unmanaged.

NM_CONTROLLED="no"
Note: Be sure to change the NM_CONTROLLED=”yes” to “no” or the network service may complain about “Connection activation failed” when it cannot find an interface to start

Switching to “network” service

When the NetworkManager is disabled, the interface can be configured for use with the network service. Follow the steps below to configure and interface using network services.

1. Set the IP address in the configuration file: /etc/sysconfig/network-scripts/ifcfg-eth0. Set the NM_CONTROLLED value to no and assign a static IP address in the file.

NAME="eth0"
HWADDR=...
ONBOOT=yes
BOOTPROTO=none
IPADDR=...
NETMASK=...
GATEWAY=...
TYPE=Ethernet
NM_CONTROLLED=no

2. Set the DNS servers to be used by adding into the file: /etc/resolv.conf :

nameserver [server 1]
nameserver [server 2]

3. Enable the network service

# systemctl enable network

4. Restart the network service

# systemctl restart network
CentOS / RHEL 5, 6 : how to disable NetworkManager
Linux OS Service ‘NetworkManager’

Filed Under: CentOS/RHEL 7, Linux

Some more articles you might also be interested in …

  1. “imuxsock lost # messages from pid # due to rate-limiting” – rsyslog rate-limiting in Linux
  2. Input/Output Errors During XFS Filesystem Access In CentOS/RHEL 7
  3. CentOS / RHEL 7 : How to Install GUI
  4. Troubleshooting “connection refused” From Remote Servers in CentOS/RHEL 7 (Either Firewalld or iptables service issue)
  5. Understanding the /etc/exports File
  6. Linux OS Service ‘scsi_reserve’
  7. CentOS / RHEL 7 : Beginners guide to systemd
  8. How to extract RAR files in CentOS/RHEL 7 and 8
  9. How to Start NTP Service With Slewing Enabled in Linux
  10. How to interpret Linux martian source messages

You May Also Like

Primary Sidebar

Recent Posts

  • How to set the default character set in MySQL and how to propagate it in a master-master replication scenario
  • “Connection reset by peer” – error while ssh into a CentOS/RHEL system with a specific user only
  • MySQL: how to figure out which session holds which table level or global read locks
  • Recommended Configuration of the MySQL Performance Schema
  • Archives
  • Contact Us
  • Copyright

© 2021 · The Geek Diary