How to disable NetworkManager in RHEL5-6-7

How to disable NetworkManager in RHEL?.

环境

• Red Hat Enterprise Linux (RHEL) 5.
• Red Hat Enterprise Linux (RHEL) 6.
• Red Hat Enterprise Linux (RHEL) 7.
• NetworkManager service.

问题

• Disabling NetworkManager

  • What steps are needed to disable the NetworkManager service?
  • What is needed to ensure it does not start again on a subsequent reboot?

• Disabled NetworkManager but still seeing errors (need to fully disable)

  • Trouble configuring networking with NetworkManager and need to disable.
  • Disabled NetworkManager but still seeing errors about it and "Connection activation failed"

决议

FOR RHEL5 and RHEL6.

Disabling NetworkManager.

The steps below will disable network manager and allow the interface to be managed by the network service instead.

• Stop the NetworkManager service:

  Raw

  # service NetworkManager stop
  

• Disable it permanently so that the NetworkManager service will not be started on next boot:

  Raw

  # chkconfig NetworkManager off
  

• Confirm if the NetworkManager service has been disabled:

  Raw

  # chkconfig --list|grep NetworkManager
  

• Add below parameter in /etc/sysconfig/network-scripts/ifcfg-ethX to ensure NetworkManagerdoes not take control of the interface in case if it is accidentally activated.

  Raw

  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 the "network" service

Once NetworkManager is disabled, the interface can be configured for use with the network service.

• Set the correct IP address by editing the file: /etc/sysconfig/network-scripts/ifcfg-eth0

  Raw

  IPADDR=......  
  NETMASK=.....  
  GATEWAY=.....  
  ONBOOT=yes  
  BOOPROTO=static
  NM_CONTROLLED=no
  

• Set the DNS servers to be used by editing the file : /etc/resolv.conf

  Raw

  nameserver 10.x.x.1
  nameserver I0.x.x.2
  

• Restart the network service

  Raw

  # chkconfig network on
  # service network restart
  

FOR RHEL7

Disabling NetworkManager.

• Stop the NetworkManager service:

  Raw

  # systemctl stop NetworkManager
  

• To disable the service permanently:

  Raw

  # systemctl disable NetworkManager
  

• Add below parameter in /etc/sysconfig/network-scripts/ifcfg-enXXX to ensure NetworkManagerdoes not take control of the interface in case if it is accidentally activated.

  Raw

  NM_CONTROLLED="no"
  

Switching to the "network" service

Once NetworkManager is disabled, the interface can be configured for use with the network service.

• Set the correct IP address by editing the file: /etc/sysconfig/network-scripts/ifcfg-enXXX

  Raw

  IPADDR=......  
  NETMASK=.....  
  GATEWAY=.....  
  ONBOOT=yes  
  BOOPROTO=static
  NM_CONTROLLED=no
  

• Restart the network service

  Raw

  # systemctl restart network.service
  

根源

• The NetworkManager service may not be needed for server environments as it may override changes made to network configuration files, which may be undesirable.

• If the NetworkManager services is not needed or not working as expected, then the network service can be used instead.

诊断步骤

• The NetworkManager service seems to be taking over the ifcfg script files and changing them to incorrect information.

• Check on if the NetworkManager service is enabled or running to see if it should be disabled:

  Raw

  # chkconfig --list | grep NetworkManager
  # service NetworkManager status
  

• If NetworkManager is disabled, but when starting the network service there are errors and messages regarding:

  • NetworkManager
  • "Connection activation failed"

• Check to be sure that at least one working ifcfg-ethX file in /etc/sysconfig/network-scripts does not contain "NM_CONTROLED=yes" .