How to add bump to shader?

Question

I have a simple diffuse shader. I would like to add some bump to it. How can I do this in Cycles? Where do I plug in my checkered texture.

Answer 1

Per shader:

Plug it it into the Height input of a Bump node (ShiftA>Add node > Vector > Bump)

The above node setup will only bump the diffuse part of the shader, simulating a bumpy diffuse surface coated with a smooth glossy "glaze" layer.

Entire material:

If you want to apply the same bump mapping to all the shaders in your material, just plug it into the Displace input of the Material output node:

You'll notice that now the bump is applied to the glossy shader too: