If I'm using something like gitolite to handle access control how well does authorized_keys scale? Meaning if I have say 50,000 users what will the performance be like (I'm guessing not very good). What are the alternatives?
Update: I decided to do some testing myself (which I should have done in the first place). I wrote a simple script to generate SSH keys and add them to a authorized_keys file. My computer isn't that fast so I only generated 8,061 keys and then added my own to the end, the file ended up being 3.1MB. I then added a git repository with one file and ran git clone three times:
With 8,061 keys (Mine is at the end of the file) real 0m0.442s real 0m0.447s real 0m0.458s With just a single key: real 0m0.248s real 0m0.264s real 0m0.255s
The performance is much better than I thought it would be. I'm still very interested in any alternatives that may be
faster more efficient for a large group of keys 50,000+.