Debian 9.5 LXC NIC

[Jevin gala]

Hi,

Network status is showing this error :

Dec 05 07:33:00 test ifup[360]: ifup: failed to bring up eth0
Dec 05 07:33:00 test systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Dec 05 07:33:00 test systemd[1]: Failed to start Raise network interfaces.


And interface name is shown as eth0@if42 in LXC vps

 

[t.lamprecht]

What's your config?

pct config CTID

And CT internal network settings, e.g.,

cat /etc/network/interfaces

?

 

[Jevin gala]

root@proxmox:~# pct config 1016
arch: amd64
cores: 2
cpulimit: 0
cpuunits: 1204
hostname: test
memory: 1204
net0: name=eth0,bridge=vmbr1,hwaddr=00:16:3e:7c:66:bb,type=veth
onboot: 1
ostype: debian
rootfs: local:1016/vm-1016-dgyswiss0wukg4zr-agr301gieduz4oqp.raw,size=5G
swap: 0
--------------------------------------------------------------------------------------------------------------

root@test-create-dnd:~# cat /etc/network/interfaces
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
address 10.0.0.8
netmask 255.255.255.0

gateway 10.0.0.1

 

[t.lamprecht]

Hmm, OK, if you manually add the address in the CT, like:

ip addr add 10.0.0.8/24 dev eth0
ip link set eth0 up
ping 10.0.0.1

If this works then some more infos about the failed ifup with jorunalctl would be nice, else you may want to check vmbr1 from the host.
Do other CTs work?

 

[Jevin gala]

Hi,

I added manually route and it pings to gateway but not to others.
This is only happening with Debian 9.5 .

# ifup eth0
RTNETLINK answers: File exists
ifup: failed to bring up eth0

And journalctl -xe shows :

Dec 05 14:06:06 test-create-dnd systemd[1]: Failed to start Raise network interfaces.

 

[t.lamprecht]

# ifup eth0
RTNETLINK answers: File exists
ifup: failed to bring up eth0

and you tried an ifdown / ifup cycle (just to be sure)?
and

journalctl --since -1hour

doesn't shows anything else related to this?

 

[Jevin gala]

It shows this :

root@test-create-dnd:~# ifdown eth0
ifdown: interface eth0 not configured
root@test-create-dnd:~# ifup eth0
RTNETLINK answers: File exists
ifup: failed to bring up eth0

 

[Stoiko Ivanov]

seems like there is still some manual configuration (via `ip addr add`) in place - please post the output of
`ip a`
`ip r`

 

[Jevin gala]

ip r is empty

root@test-create-dnd:~# ip a
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
7: eth0@if8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 02:00:00:6a:39:28 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.0.0.8/32 brd 10.0.0.8 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::ff:fe6a:3928/64 scope link
valid_lft forever preferred_lft forever

 

[Stoiko Ivanov]

* you need to remove the 10.0.0.8/32, if you want the ifup/ifdown to succeed
* it could be easier to stop the container and start it again
* if you want to do it manually:

ip a d 10.0.0.8/32  dev eth0
ifdown -v eth0
ifup -v eth0