  We investigate the holographic dual to supergravity instanton solutions in
$\rm AdS_5\times S^5/\mathbb{Z}_k$, which are described entirely in terms of
geodesics on the AdS moduli space. These instantons are expected to be
holographically dual to instantons in an $\mathcal{N}=2$ necklace quiver gauge
theory in four dimensions with $k$ gauge nodes, at large N. For the
supersymmetric instantons we find a precise match between the on-shell actions
and the vevs of $\text{Tr}[F^2]$ and $\text{Tr}[F\wedge F]$ computed on both
sides of the duality. This correspondence requires an exact identification
between the massless supergravity scalars and the dual gauge couplings which we
give in detail. We also find a candidate for the supergravity dual of a
quasi-instanton in the quiver theory, which is a non-supersymmetric extremal
solution.
