Ttgjyuk

I'm trying to reconfigure some network kernel settings at /proc/sys/net/core in my container.
But it seems some options are missing in docker ubuntu:14.04 so that i can't configure them.
example:

$ sysctl -w net.core.rmem_max=262144
sysctl: cannot stat /proc/sys/net/core/rmem_max: No such file or directory

There're just a few options in my docker:

In my Host's Ubuntu:

$ ls /proc/sys/net/core/
bpf_jit_enable message_burst rmem_default xfrm_acq_expires
busy_poll message_cost rmem_max xfrm_aevent_etime
busy_read netdev_budget rps_sock_flow_entries xfrm_aevent_rseqth
default_qdisc netdev_max_backlog somaxconn xfrm_larval_drop
dev_weight netdev_rss_key warnings
flow_limit_cpu_bitmap netdev_tstamp_prequeue wmem_default
flow_limit_table_len optmem_max wmem_max

In my docker's Ubuntu:

$ ls /proc/sys/net/core/
somaxconn xfrm_acq_expires xfrm_aevent_etime xfrm_aevent_rseqth xfrm_larval_drop

I attempted to run docker with --net=none/default (I don't wanna use host) or --v /proc/sys/net:/proc/sys/net but nothing changes.

I read this from kernel.org: "/proc/sys/net ... You may see only some of them, depending on your kernel's configuration."

So is there any way to get fully options?

Thanks!

Those files represent configuration of your host network stack, without --net=host you create a new network stack inside a container and files are 'overwritten' by container ones.

If you need access to host stack you might consider mounting it somewhere else, lets say /net using -v /proc/sys/net/:/net and then simply use echo value > /net/my/file instead of using sysctl.