Created attachment 1036890 [details]
Description of problem:
SELinux denials prevent galera state snapshot transfer (sst) from running at startup on non-primary nodes. Consequently, new nodes cannot join a cluster. There are several sst mechanisms which presumably all need to be handled differently. The default is rsync, which appears to temporarily start an rsync daemon listening on port 4444 (normally related to kerberos, apparently). The rsync daemon shuts down after the initial sync, as incremental transfer takes over.
I have attached a list of SELinux denials, and can confirm that a module created from audit2allow run against these allows the sst to succeed.
Note that we seem to have been here before, or at least somewhere very similar: bug 1145619.
Version-Release number of selected component (if applicable):
If you want to test this, you can follow the instructions here: http://blog.heisenbug.com/2015/06/configure-simple-galera-cluster-on.html
Ok maybe we want to think about a new boolean. Something like
## Allow mysqld to do galera state snapshot transfer (sst).
which could cover also another methods if it is needed.
what do you think?
Well, there's more than 1 type of sst:
The one I was using, because it's the default, is rsync. I suspect other methods might have other issues. Might be best called mysql_can_rsync.
(In reply to Matthew Booth from comment #3)
> Well, there's more than 1 type of sst:
> The one I was using, because it's the default, is rsync. I suspect other
> methods might have other issues. Might be best called mysql_can_rsync.
Yes, it makes sense. I see more bugs like this one.
something what we have for postgresql_can_rsync boolean.
we have some fixes.
Could you try to run it in permissive to see if we can get more AVCs?
Here is a scratch build that should fix the issue: https://fedorapeople.org/~lvrabec/128.17.fc22.1/
If you encounter any more AVC's, please record them in permissive mode and share here.
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