Can't run the launcher to install Discourse on CentOS 7

systemctl start docker.service


In case anyone finds it handy in future:

On CentOS 7 try linking the non-existent binary to the existing docker binary as follows:
ln -s /usr/bin/docker /usr/bin/

This did it for me just now…

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Worked. Somehow this should come up as the right answer.

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Exactly. If it says docker isn’t running, just do a service docker start and move on. That’s what I did.