Monitoring, Management & Location Tracking

Problem:

What to do when we come across the message "Device eth0 does not seem to be present, delaying initialization" when starting the network service on Airwave.

# service network start
Device eth0 does not seem to be present, delaying initialization

We usually come across this issue when we are migrating from one VM instance to another and the MAC address is not matching up. If we execute the command "ifconfig" to check the ip details, we will see only the loop back interface.

# ifconfig

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

To resolve this issue delete networking interface rules file so that it can be regenerated and reboot your Airwave instance.

# rm /etc/udev/rules.d/70-persistent-net.rules
# reboot

Now once the server is back up the new MAC would be updated and we can restart the network service once,

# service network restart

Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Determining if ip address 192.168.1.99 is already in use for device eth0...
                                                           [  OK  ]

Now if we execute the command "ifconfig" we would see the eth0 interface

# ifconfig

eth0      Link encap:Ethernet  HWaddr 08:00:27:FE:C1:03
          inet addr:192.168.1.99  Bcast:xxxxxxxx  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fefe:c103/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4400 errors:0 dropped:0 overruns:0 frame:0
          TX packets:129 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:387597 (378.5 KiB)  TX bytes:19567 (19.1 KiB)