The perspective on containers is very different between the 2. In short OpenVZ sees a container as a VPS, and docker sees a container as an application/service. What does this imply? For OpenVZ you can expect that when you create containers, its sort of like making Virtual Servers. OpenVZ has interfaces focussed on setting up … Read more
Due to the update of vzctl from 4.6 to 4.7 they changed the setting of nf_conntrack to be disabled by default. (https://openvz.org/Download/vzctl/4.7/changes) Corresponding commit message: … Disable conntrack for VE0 by default IP conntrack functionality has some negative impact on venet performance (uo to about 10%), so they better be disabled by default. … (Source: … Read more
Swapfiles are only supported on some openvz setups, and disabled on purpose by some admins so you cant use up much more resources than you’ve been alocated. You probably need to upgrade your vps.
Docker is VERY lightweight compared to a VM and a VM system should function just fine running containers. Each container essentially does run as an isolated system so it’s very good for isolation from a perspective of system stability. Based on your description it sounds like the ideal use case for Docker. If you do … Read more
Two possible options Your PATH does not contain /usr/bin firewall-cmd is not installed yum install firewalld