[networked]

With conventional Linux distributions it is tricky to do this in a clean and idempotent way while preserving the entirety of the existing server configuration. The best solution of which I am aware is Augeas, which supports multiple file formats, and tools of similar type that specialize in a single file format (e.g., jq).

What these generally do is parse the entire configuration file into an abstract syntax tree, apply the modifications you have asked for to the tree, then serialize the result back into the configuration file format. This ensures that the input and the output are both at least syntactically valid; as a result it is less error-prone than sed/awk. Unlike with configuration file templates (e.g., Ansible's Jinja2 templates) the changes can be applied on top of the distribution's default configuration if desirable and reapplied when that default configuration is updated.