He He, I am successful to install it onto a synology 
I do not know much about xwiki or docker.
The problem was the connection from inside a container to internet.
Inside a container devices are receiving an 172.x.x.x IP address.
And my internet router does not know this, so I add a static route for the 172.x.x.x network to my NAS.
After this I could ping the container IP addresses, but the container devices still cannot ping something.
The cause of this the Firewall off my NAS.
Now Xwiki is running.
Next step is:
- look what is possible with Xwiki
- Is it possible to transfer documentation created in Xwiki to other applications?
- How to make backups and restore these to a newly created Xwiki installation.
- Can we use Single Sign On (SSO) for users?
Best regards,
Martien