I am moving a Drupal 7 application on Ubuntu 14.04 from development to production. I use nginx (1.4.6-1ubuntu3.2) and php5-fpm (5.5.9+dfsg-1ubuntu4.9).

The production machine is a VPS hosted at 1&1 and was running alright up until about 4 hours ago. Nginx had been giving some errors on startup:

2015/05/17 16:21:39 [info] 27859#0: Using 32768KiB of shared memory for push module in /etc/nginx/nginx.conf:85
2015/05/17 16:21:39 [alert] 27859#0: mmap(MAP_ANON|MAP_SHARED, 1048576) failed (12: Cannot allocate memory)

but nginx and php5-fpm were working alright.

Later, however, after I had uploaded some corrected theme data (basically CSS generated from SASS), nginx went down. Since then I have been unable to make nginx AND php5-fpm start. I can start one or the other. Unfortunately php5-fpm has not generated any error messages that I have been able to find.

Rebooting doesn't solve the problem.

Nginx, however, now generates the following error.

2015/05/17 23:40:40 [alert] 1559#0: mmap(MAP_ANON|MAP_SHARED, 33554432) failed (12: Cannot allocate memory)

I'm pretty sure I have enough memory. The command free -m gives:

total used free shared buffers cached
Mem: 8192 168 8023 126 0 149
-/+ buffers/cache: 19 8172
Swap: 0 0 0

I have seen other discussions with similar symptoms which seem to suggest that parameters of the VPS need to be adjusted by the provider. Is this such a case? If so, which parameters do I need to ask to have adjusted?

I'm out of my depth on this, so I'd be grateful for any assistance anyone could offer.

Steve