Recently I faced one weird issue with Nginx and suddenly getting an error on restarting Nginx "Cannot allocate memory" issue as showing in the following image. When I tried free -g command, memory was available and there was no recent configuration change. Then I started looking into config files and found this line in one of them: #Working for odoobiz proxy_cache_path /var/odoo/bzcache/ levels=1:2 keys_zone=my_cache:6000m max_size=6g inactive=60m use_temp_path=off; Here I was setting more memory - around 6G and available was only 4G for cache, and when I changed the settings to the following, it worked! #Working for odoobiz proxy_cache_path /var/odoo/bzcache/ levels=1:2 keys_zone=my_cache:2000m max_size=3g inactive=60m use_temp_path=off; So, if you are facing any such issue, please check your configuration files and see if somewhere you are allocating more memory then available. I hope this post will help someone else as well! Thanks! Enjoy Programming!