nginx 0.2.0 *) The pid-file names used during online upgrade was changed and now is not required a manual rename operation. The old master process adds the ".oldbin" suffix to its pid-file and executes a new binary file. The new master process creates usual pid-file without the ".newbin" suffix. If the master process exits, then old master process renames back its pid-file with the ".oldbin" suffix to the pid-file without suffix. *) Change: the "worker_connections" directive, new name of the "connections" directive; now the directive specifies maximum number of connections, but not maximum socket descriptor number. *) Feature: SSL supports the session cache inside one worker process. *) Feature: the "satisfy_any" directive. *) Change: the ngx_http_access_module and ngx_http_auth_basic_module do not run for subrequests. *) Feature: the "worker_rlimit_nofile" and "worker_rlimit_sigpending" directives. *) Bugfix: if all backend using in load-balancing failed after one error, then nginx did not try do connect to them during 60 seconds. *) Bugfix: in IMAP/POP3 command argument parsing. Thanks to Rob Mueller. *) Bugfix: errors while using SSL in IMAP/POP3 proxy. *) Bugfix: errors while using SSI and gzipping. *) Bugfix: the "Expires" and "Cache-Control" header lines were omitted from the 304 responses. Thanks to Alexandr Kukushkin.

--- a/auto/init
+++ b/auto/init
@@ -54,8 +54,16 @@ clean:
 
 upgrade:
 	$NGX_SBIN_PATH -t
+
+	# upgrade compatibility from 0.1.x to 0.2.x
+	cp $NGX_PID_PATH $NGX_PID_PATH.oldbin
+
 	kill -USR2 \`cat $NGX_PID_PATH\`
 	sleep 1
-	test -f $NGX_PID_PATH.newbin
-	kill -WINCH \`cat $NGX_PID_PATH\`
+	test -f $NGX_PID_PATH.oldbin
+
+	# upgrade compatibility from 0.1.x to 0.2.x
+	cp $NGX_PID_PATH $NGX_PID_PATH.newbin
+
+	kill -WINCH \`cat $NGX_PID_PATH.oldbin\`
 END