[Shop-talk] Fence posts

[Robert Nogueirao]

Folks, I have a 4 foot high cedar wood fence in bad shape that I need to fix. While I will replacing the rails and pickets with new wood the posts appear to be in good condition,  ie: no rot, except for the fact they are set in concrete and the posts have shrunk a bit so the posts are loose on the concrete.
What would be the easiest way to firm up the posts in those holes? 
I’m only looking for a fix that will last 5 or so years.
Bob Nogueira