A huge part is companies rejecting simpler solutions.
For example, you can use latest systemd to basically replace all of docker and then some. It provides advanced sandboxing, resource control and job control for units and even manages "containers". Which is why my private servers mostly use systemd properly configured to provide what containers are thought to provide. The deployment is switching out a binary or add a directory tree, override a .service line and then reload and restart. Easy.
Though over a 10 year period, companies, developers and operators went all-in on "container runtimes" and here we are.
That being said, things like kubernetes are NOT NEW and NOT DIFFERENT from solutions like corosync+pacemaker (who remembers them?). They do the same thing, with the same levels of flexibility and extensibility and pluggability, just with containers. From my POV people who are surprised by k8s and its complexity never lived or forgot the cluster tech of the 00s. It's just about to come together as a circle, and the next iteration seems to be micro VMs instead of containers.
For example, you can use latest systemd to basically replace all of docker and then some. It provides advanced sandboxing, resource control and job control for units and even manages "containers". Which is why my private servers mostly use systemd properly configured to provide what containers are thought to provide. The deployment is switching out a binary or add a directory tree, override a .service line and then reload and restart. Easy.
Though over a 10 year period, companies, developers and operators went all-in on "container runtimes" and here we are.
That being said, things like kubernetes are NOT NEW and NOT DIFFERENT from solutions like corosync+pacemaker (who remembers them?). They do the same thing, with the same levels of flexibility and extensibility and pluggability, just with containers. From my POV people who are surprised by k8s and its complexity never lived or forgot the cluster tech of the 00s. It's just about to come together as a circle, and the next iteration seems to be micro VMs instead of containers.