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Old 09-15-2018, 04:50 AM   #1
miccze
LQ Newbie
 
Registered: Sep 2018
Distribution: Centos
Posts: 9

Rep: Reputation: Disabled
Network.service failed starting: No suitable device found


I recently installed Centos 7 minimal version on my Raspberry PI 3B+. Network seems to be working ( i am able to ssh to it), but network.service is failing to start. Below journalctl output:

Code:
-- Unit network.service has begun starting up.
Sep 14 14:46:44 rpicent1 network[1253]: Bringing up loopback interface:  [ OK ]
Sep 14 14:46:45 rpicent1 NetworkManager[244]: <info>  [1536929205.2079] 
audit: op="connection-activate" uuid="85810e29-e837-1d48-f5e7-9cd60d5a0ee4" 
name="System link" result="fail" reason="No suitable device found for this
Sep 14 14:46:45 rpicent1 network[1253]: Bringing up interface link:  Error: 
Connection activation failed: No suitable device found for this connection 
connection."
Sep 14 14:46:45 rpicent1 network[1253]: [FAILED]
Sep 14 14:46:45 rpicent1 network[1253]: Bringing up interface wlan0:

RTNETLINK answers: File exists
Sep 14 14:46:46 rpicent1 network[1253]: [  OK  ]
Sep 14 14:46:46 rpicent1 network[1253]: Bringing up interface 3Bredband-4FB2- 
2.4GHz:  [  OK  ]
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 network[1253]: RTNETLINK answers: File exists
Sep 14 14:46:47 rpicent1 systemd[1]: network.service: control process exited, 
code=exited status=1
Sep 14 14:46:47 rpicent1 systemd[1]: Failed to start LSB: Bring up/down 
networking.
-- Subject: Unit network.service has failed
-- Defined-By: systemd
-- Subject: Unit network.service has failed
-- Defined-By: systemd

-- Unit network.service has failed
-- The result is failed.
Sep 14 14:46:47 rpicent1 systemd[1]: Unit network.service entered failed 
state.
Sep 14 14:46:47 rpicent1 systemd[1]: network.service failed.
Sep 14 14:46:47 rpicent1 polkitd[316]: Unregistered Authentication Agent for 
unix-process:1247:56939 (system bus name :1.70, object path 
/org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) 
(disconnected from bus)
My #ip a output:

Code:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether b8:27:eb:e9:65:e0 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether b8:27:eb:bc:30:b5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.8.102/24 brd 192.168.8.255 scope global noprefixroute dynamic wlan0
       valid_lft 84766sec preferred_lft 84766sec
    inet 192.168.8.210/24 brd 192.168.8.255 scope global secondary wlan0
       valid_lft forever preferred_lft forever
    inet6 fe80::159:6aa3:3794:9a87/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
aaand below my /etc/sysconfig/network-scripts/ifcfg-wlan0 file:

Code:
TYPE=WiFi
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=wlan0
DEVICE=wlan0
ONBOOT=yes
IPV6_PRIVACY=no
UUID=b9253d06-b892-41ad-a05b-7c49a2eebc73
IPADDR=192.168.8.210
NETMASK=255.255.255.0
HWADDR=B8:27:EB:BC:30:B5
GATEWAY=192.168.8.1
DNS1=192.168.8.1
Another issue is that i have double IP, despite having static IP configured in ifcfg-wlan0 file, as you can see above. First that is dynamically populated by my router's dhcp server and second which i specified in ifcfg-wlan0 file as static IP. Any idea what should i do different to have just one static ip?

FYI, after OS installation, there was no ifcfg files, so i had to create ifcfg-wlan0.
 
Old 09-15-2018, 02:16 PM   #2
michaelk
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Posts: 17,481

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Welcome to LinuxQuestions.

I have not tried installing CentOS 7 on a Pi so I am not sure how it is different then a regular PC. Typically NetworkManager controls all networking functions by default and therefore no need for the ifcfg- files.

You can either use NetworkManager and configure wlan0 with a static IP address using its applet in the desktop or command line utility or disable it completely and do everything manually.
 
Old 09-15-2018, 03:52 PM   #3
scasey
Senior Member
 
Registered: Feb 2013
Location: Tucson, AZ, USA
Distribution: CentOS 7.5
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What michaelk said. I've not yet decoded the CentOS 7 differences re: NetworkManager and using network-scripts, tho, so I'm watching with interest.

I do note, however, that yes, your wlan appears to be working. The error you're getting appears to be related to the loopback configuration. Maybe you need to create ifcfg-lo?

Last edited by scasey; 09-15-2018 at 03:54 PM.
 
Old 09-16-2018, 02:59 AM   #4
miccze
LQ Newbie
 
Registered: Sep 2018
Distribution: Centos
Posts: 9

Original Poster
Rep: Reputation: Disabled
Thanks for replies.
I found what was wrong with network.service and why it wasn't starting.
I turned out, that there was file ifcfg-link, in which below lines were written:
Code:
DEVICE=link
BOOTPROTO=dhcp
ONBOOT=on
After renaming this file with orig, so the system won't find it, network.service starts up.
However, when i then disable NetworkManager to operate just on network-scripts, it turns out link is needed after all, as network service fails to start with following output:

Code:
-- Unit network.service has begun starting up.
Jan 01 01:04:01 rpicent1 network[1113]: Bringing up loopback interface:  [  OK  ]
Jan 01 01:04:02 rpicent1 network[1113]: Bringing up interface wlan0:  RTNETLINK answers: File exists
Jan 01 01:04:02 rpicent1 network[1113]: [  OK  ]
Jan 01 01:04:03 rpicent1 network[1113]: Bringing up interface 3Bredband-4FB2-2.4GHz:
Jan 01 01:04:08 rpicent1 network[1113]: Determining IP information for wlan0... failed; no link present.  Check cable?
Jan 01 01:04:08 rpicent1 network[1113]: [FAILED]
Jan 01 01:04:08 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:08 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:08 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:08 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:08 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:09 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:09 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:09 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:09 rpicent1 network[1113]: RTNETLINK answers: File exists
Jan 01 01:04:09 rpicent1 systemd[1]: network.service: control process exited, code=exited status=1
Jan 01 01:04:09 rpicent1 systemd[1]: Failed to start LSB: Bring up/down networking.
-- Subject: Unit network.service has failed

Any idea what should i write into it, so this would work with just static IP from ifcfg-wlan0?
Also, i still can't get rid off the double IP problem, when NetworkManager is running.
 
  


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