On Thu, Oct 03, 2013 at 09:32:15AM +0000, Purcareata Bogdan-B43198 wrote: > Hello, > > I am currently running a setup with hundreds of containers starting on the > same Linux host. Each of these containers receive a single virtual interface > eth0 connected to a host interface using macvlan. These containers only use > IPv4, but by default they receive an IPv6 address as well. This causes my > kernel to start dumping messages, complaining about IPv6 neighbour table > overflow: > > [ 558.739929] net_ratelimit: 3833 callbacks suppressed > [ 558.743597] IPv6: Neighbour table overflow > [ 558.746517] IPv6: Neighbour table overflow > [ 558.749426] IPv6: Neighbour table overflow > [ 558.752386] IPv6: Neighbour table overflow > [ 558.755302] IPv6: Neighbour table overflow > > Is there any way to disable IPv6 in containers? I'm thinking about something > like lxc.network. ... in the config file, that I don't know about? > > My current solution is to enter the container and issue "echo 1 > > /proc/sys/net/ipv6/conf/eth0/disable_ipv6". This made me think that it would > be a nice feature to control /proc/sys kernel parameters at runtime using the > container config file. I'm thinking some lines that would start with > lxc.sysctl and then contain the whole path to the parameter and the value. So > for my usecase it would be something like: > > lxc.sysctl.net.ipv6.conf.eth0.disable_ipv6 = 1 > > What do you think? > > Bogdan P.
Most distros support a mechanism to set sysctl knobs at boot time, I don't think it should be LXC's job to do so but instead you should just update the right config file in your distribution to do that for you. Something like: net.ipv6.conf.all.disable_ipv6=1 in /etc/sysctl.conf should do the trick. -- Stéphane Graber Ubuntu developer http://www.ubuntu.com
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