Collabora installation - docker doesn't run?

Trying to install collabora - on Centos 6. I expected troubles but not on that level…
Unfortunately, I’m stuck on the beginning:

docker pull collabora/code
docker run -t -d -p -e ‘domain=cloud\.nextcloud\.com’ --restart always --cap-add MKNOD collabora/code
result of this command is similar to the ones from tutorial. Of course, Ive put there my own domain. (details below).

The problem is - I cannot connect to collabora on localhost: and localhost:9980, the answer is “unable to connect”

I’ve expected problem later - because for now I’ve only dynamic no-ip domain, without vhosts, so my nextcloud lies on
But it shouldnt affect collabora installation on such early stage.
How to debug it? What to do?

not enough info here.

what exactly are you trying when it states “unable to connect”

check if the docker instance is running with: docker ps -a
check your docker logs with docker logs idofyourdocker
check the nextcloud and webserver access logs

Docker is only available on CentOS 7 as far as I know. If there is a way to install Docker on CentOS 6.x I would like to know!

Need Help PLease?

I have installed Nextcloud and its working fine on this domain name
but when I try to install docker on my ubuntu 16.0.4 with following command

sudo docker run -t -d -p -e ‘’ --restart always --cap-add MKNOD collabora/code

I am getting following error:

docker: Error response from daemon: oci runtime error: process_linux.go:330: running prestart hook 0 caused “exit status 1: time=“2017-02-20T01:43:35-05:00” level=fatal msg=“failed to add interface vethd6f3252 to sandbox: failed to get link by name “vethd6f3252”: Link not found”\n”.