Are you using nodebb-plugin-import?
That seems like the only one worth a shot today from what i can find.
Simply follow the instructions in the README, there are some handy tips there for converting BBcode and such aswell.
Sure having a separate database server is recommended, but really not needed - you should backup your dumps externally just in case if you don't though.
If you're going with redis, this may be useful for that cause.
This probably isn'tthe most helpful post, as i haven't migrated from another software myself, but i'm trying to help in possible ways.
We want to migrate wordpress posts as well as comments and replies associated to that post into nodeBB under General Discussion category.
Please note our wordpress site is multi-site network.
We have search for the implemented plug-in but we have not found any plug-in.
So if you know any kind of a plug-in supported for latest version 0.6.0 which fulfil our requirement, please let us know.
If there is no such kind of a plugin is available we are planning to implement wordpress plugin which migrate posts as well as comments and replies associated to that post.
To implement wordpress plugin we need REST/MOBILE API. So by using that REST/MOBILE API, We can create topics/comments/reply from outside the nodeBB environment. So please let us know if nodeBB supports such kind of REST/MOBILE API.
So any help would be greatly appreciated.