What does "uname -a" have to say about the running CentOS, for example: ``` Linux xxx 5.8.3-x86_64-linode137 #1 SMP PREEMPT Mon Aug 24 14:50:33 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux ``` and the release of CentOS: ``` # cat /etc/centos-release CentOS release 6.10 (Final) # ``` Are you actually running the code (in your production environment) on an actual Linux kernel or rather on some kiddie-tainer (there are lots of these that go by lots of amusing names) which claims (or often does not claim but many seem to assume) to support the needed capabilities?