LinuxQuestions.org
Download your favorite Linux distribution at LQ ISO.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Containers
User Name
Password
Linux - Containers This forum is for the discussion of all topics relating to Linux containers. Docker, LXC, LXD, runC, containerd, CoreOS, Kubernetes, Mesos, rkt, and all other Linux container platforms are welcome.

Notices


Reply
  Search this Thread
Old 04-23-2019, 10:11 AM   #1
andre88
LQ Newbie
 
Registered: Mar 2019
Posts: 17

Rep: Reputation: Disabled
DNS resolution in LXC container


Hi all,
I'm using srsLTE-emane (https://github.com/adjacentlink/srsLTE-emane), an open source software that emulates LTE Network, and I have a problem with DNS resolution in LXC container.

I'm running a demonstration (found on https://github.com/adjacentlink/emane-model-lte.git) made by three containers: ue-02 (the mobile phone), enb-21 (the radio base station) and epc-01 (the core network of LTE). I'm able to ping any IP address from ue-02 (for example 104.83.108.242):

Code:
root@ue-02:~# ping 104.83.108.242 -c 5
PING 104.83.108.242 (104.83.108.242) 56(84) bytes of data.
64 bytes from 104.83.108.242: icmp_seq=1 ttl=50 time=96.8 ms
64 bytes from 104.83.108.242: icmp_seq=2 ttl=50 time=95.1 ms
64 bytes from 104.83.108.242: icmp_seq=3 ttl=50 time=94.5 ms
64 bytes from 104.83.108.242: icmp_seq=4 ttl=50 time=93.0 ms
64 bytes from 104.83.108.242: icmp_seq=5 ttl=50 time=91.8 ms
I'm not able to activate the DNS resolution (where www.repubblica.it is the internet site related to 104.83.108.242):

Code:
root@ue-02:~# nslookup www.repubblica.it
;; connection timed out; no servers could be reached
Code:
root@ue-02:~# LC_ALL=C ping www.repubblica.it
ping: www.repubblica.it: Name or service not known
I have read the instructions to modify the file resolv.conf, but these containers don't have this file: these are a bit different from classical LXC containers. The unique configuration file is lxc.conf.

lxc.conf:
Code:
lxc.uts.name=ue-02
lxc.net.0.type=veth
lxc.net.0.name=backchan0
lxc.net.0.flags=up
lxc.net.0.link=letce0
lxc.net.0.ipv4.address=10.88.1.2/24
lxc.net.0.veth.pair=aveth.3.0
lxc.net.1.type = empty
lxc.net.1.flags=up

lxc.console.path = none
lxc.tty.max = 1
lxc.pty.max = 128
lxc.cgroup.devices.allow = a
lxc.mount.auto = proc sys cgroup


lxc.autodev = 1
lxc.hook.autodev = /usr/share/emane-model-lte/demo/two_ues/ue-02/lxc.hook.autodev.sh
lxc.apparmor.profile = unconfined
the only differences with lxc.conf of the other two containers are in the name and in the IP addresses.

Someone could help me?

Thank you very much!!

Andrea
 
Old 04-24-2019, 10:16 AM   #2
RickDeckard
Member
 
Registered: Jan 2014
Location: Acworth, Georgia, USA
Distribution: Arch+Gentoo Hardened, Ubuntu
Posts: 121

Rep: Reputation: Disabled
Do you have LXC configuration files in /etc/dnsmasq.d-available ??

I think modifying them with the line "dhcp-option=<your name server>" should work.
 
Old 04-25-2019, 03:36 PM   #3
andre88
LQ Newbie
 
Registered: Mar 2019
Posts: 17

Original Poster
Rep: Reputation: Disabled
Hi Rick! Thank you for your answer!!
Yes, I have found the file. What should I use in "your name server"? I have tried
Code:
dhcp-option=option:dns-server,8.8.8.8
and
Code:
dhcp-option=option:dns-server,0.0.0.0,8.8.8.8
but these don't work...

Andrea

Last edited by andre88; 04-25-2019 at 04:05 PM. Reason: Update of the attempts
 
Old 05-07-2019, 03:15 AM   #4
andre88
LQ Newbie
 
Registered: Mar 2019
Posts: 17

Original Poster
Rep: Reputation: Disabled
I have solved the problem, typing

Code:
echo "nameserver 8.8.8.8" | sudo tee -a /etc/resolv.conf
Andrea
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
[SOLVED] "lxc list" vs "lxc-ls" yknivag Linux - Virtualization and Cloud 1 03-09-2017 05:53 AM
LXC Container: sound Not working charlie101 Linux - Virtualization and Cloud 10 06-14-2015 11:16 AM
[SOLVED] Outputting X display from inside an LXC Container charlie101 Linux - Virtualization and Cloud 1 02-04-2013 09:41 PM
script to get a lxc-container like iso of current. cod_liver_0il Slackware 1 09-10-2012 11:12 AM
How to end a Linux Container (LXC) from within? Skaperen Linux - Virtualization and Cloud 0 06-14-2011 09:37 AM

LinuxQuestions.org > Forums > Linux Forums > Linux - Containers

All times are GMT -5. The time now is 06:23 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration