I just want to know of it is possible to install mods into my own server that I have already played in. This is for me and my friends to play in.
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1A) yes, but probably a good idea to backup the world folder just in case. This way if anything goes wrong, you can restore the map. B) If the mods add new ores or any other naturally generated elements, you will need to travel to unexplored areas to get them to spawn (like with many major Minecraft updates)– Trent HawkinsCommented Feb 10, 2017 at 9:06
2 Answers
Yes, (usually) you can do that.
Not being able to would be pretty pointless, since no one sets up a whole server with all plugins and mods without ever joining it to test things before it's set up completely.
Some mods might require a new map (usually their own one), though. But I've never seen a mod requiring a brand new server.
So the simply answer is - it depends. Not so simple..
So there is two things to consider.
Depending on the mod you might need a specific version of Minecraft (as some mods only support specific version of Minecraft) - so if you have let's say version 1.9, and the plugin only supports 1.10 +, then you would need to update the server (the .jar file) to a version the mod supports. The supported versions should all be listed on the mod-page (where you download it from).
Some mods require forge (or some "mod-loader"). In these cases, you'd need to use a completely different .jar file all together.
Also it's probably worth pointing out - if you are playing on a Minecraft server that you created, it's more then likely Bukkit/Spigot. If you're trying to download forge mods and put them into your Bukkit/Spigot folder - it won't work. Forge has their own launcher for that.
Hope it helps. If you want to add more information I can help further.