I have an (old) Plone (intranet) site (5.1) and I have some information I just want to show for a short time, so I consider making a new site just for this (it is a kind of bowling competition for, so users can register, see the results and some videos / pictures etc).
Is there a(n easy) way I could use the same login if I put both Plone sites on the same Zope?
PS: The users are already present i 'Plone' (site 1)
If the users don't change much, could you just copy them from one site to another, without having to be on the same Zope? Is that the only reason you're thinking of having them be on the same Zope?
There is a simple way if they are on the same domain. You can set the auth cookie to have the same secret and be set on the shared domain via the zmi. Then it will login across both if the user exists in both.
You can also do it with saml2 as it can work as an idp and so but that is a bit more complicated.