Run nscd in multiple network namespaces

How to run an instance of nscd daemon per network namespace? I did the following:

ip netns exec <network_namespace> /usr/sbin/nscd

However, it threw output

/usr/sbin/nscd: already running

The intention for an instance of nscd per namepace is this:

Each network namespace has separate host files (/etc/hosts, /etc/resolv.conf) and modifying these host files should trigger the nscd daemon to clear the nscd cache.