I've recently been trying to give Drupal 8 a serious look. I'm having a problem going through the install process, though, and I don't know if it's Drupal 8, Drupal 8 and Nginx, or just me. Have any other Nginx users been able to install D8 successfully recently?
Specifically, I get to the stage after entering the database credentials, where Drupal shows the progress bar and starts installing stuff. However, the process stops with a red warning box showing a 502 Bad Gateway error. But if I click on the link to get taken to the error page, I go to the page where I enter the name of the Drupal site and the credentials for user 1 as if nothing wrong happened. After submitting that form, however, all pages result in a 404 via Drupal (not via Nginx).

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I got the same 502 error, did
I got the same 502 error, did the same thing, was then sent to the next wizard page, where I was able to finish the installation without any other issue and my drupal 8 site is working correctly.
Philippe Blanc
President and founder of VisualFox LLc http://www.visualfox.me
Founder of OYOAHA which helped to organize the first Drupal Con in Portland
President and founder of the short lived Blacktonic A
Same here
The exact same thing happened to me the other day when installing the latest D8. It's up an running now.
It worked for me
back in June/july 2012. Must have a look currently.
same errors
I'm getting them too. php-fpm.log output below:
[25-Apr-2013 14:00:48.607330] DEBUG: pid 23684, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www0] currently 1 active children, 3 spare children, 4 running children. Spawning rate 1
[25-Apr-2013 14:00:48.607373] DEBUG: pid 23684, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www1] currently 0 active children, 3 spare children, 3 running children. Spawning rate 1
[25-Apr-2013 14:00:49.228051] WARNING: pid 23684, fpm_request_check_timed_out(), line 271: [pool www0] child 23688, script '/home/user/websites/drupal/core/install.php' (request: "POST /core/install.php") executing too slow (17.523885 sec), logging
[25-Apr-2013 14:00:49.228135] DEBUG: pid 23684, fpm_got_signal(), line 72: received SIGCHLD
[25-Apr-2013 14:00:49.228161] NOTICE: pid 23684, fpm_children_bury(), line 227: child 23688 stopped for tracing
[25-Apr-2013 14:00:49.228173] NOTICE: pid 23684, fpm_php_trace(), line 142: about to trace 23688
[25-Apr-2013 14:00:49.228653] NOTICE: pid 23684, fpm_php_trace(), line 170: finished trace of 23688
[25-Apr-2013 14:00:49.228687] DEBUG: pid 23684, fpm_event_loop(), line 409: event module triggered 1 events