disable ipv6 in docker debian:wheezy

[stongo]

Hope I'm filing this issue in right repo.

Here is a Dockerfile to reproduce the issue.

FROM debian:wheezy
RUN echo 'net.ipv6.conf.all.disable_ipv6=1' >> /etc/sysctl.conf && \
    /sbin/sysctl -p /etc/sysctl.conf

Here is the result

Step 0 : FROM debian:wheezy
 ---> c1eec48018ed
Step 1 : RUN echo 'net.ipv6.conf.all.disable_ipv6=1' >> /etc/sysctl.conf &&     sysctl -p /etc/sysctl.conf
 ---> Running in 6a8e9aeadd03
/bin/sh: 1: sysctl: not found

Same result with trying /sbin/sysctl

[stongo]

Non valid. See issue #8