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docker: Error response from daemon: unable to find "systemd" in controller set: unknown

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Hi,
 
In my funtoo hosting container, I tried out docker following this page
https://www.funtoo.org/Package:Docker 
 
After emerge I got this message output
* Unable to find kernel sources at /usr/src/linux
 * Unable to calculate Linux Kernel version for build, attempting to use running version
 *   CONFIG_MEMCG_SWAP_ENABLED:  is not set when it should be.
 *   CONFIG_CGROUP_HUGETLB:      is not set when it should be.
 *   CONFIG_RT_GROUP_SCHED:      is not set when it should be.
 * Please check to make sure these options are set correctly.
 * Failure to do so may cause unexpected problems.

Should I worried about this?

The symbolink /usr/src/linux is pointing to linux-debian-sources-lts-4.9.130, but the host seems to running 4.9.110
I removed the old symbolink, copied linux-debian-sources-lts-4.9.110 from host folder to there and made a new symbolink
 
When I tried to run the hello world docker image
docker run --detach --name app carinamarina/hello-world-app
I got this problem:
 
docker: Error response from daemon: unable to find "systemd" in controller set: unknown. 

 

I know funtoo by default is not using systemd. 
What settings/change should I make to the system to use docker for my development?
 
Thank you. 

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I also getting the same error message in my funtoo container

# docker run --rm -it alpine sh
docker: Error response from daemon: unable to find "systemd" in controller set: unknown.

@drobbins, if you could fix it it would be great.

Also it would good to know the cause and the fix for this issue.

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