1. pkispawn CA
2.[root@cisco-b22m3-01 ~]# pki-server subsystem-cert-find ca
Traceback (most recent call last):
  File "/usr/sbin/pki-server", line 28, in <module>
    import pki.server.cli.subsystem
  File "/usr/lib/python2.7/site-packages/pki/server/cli/subsystem.py", line 26,
in <module>
    import nss.nss as nss
ImportError: No module named nss.nss

yum install python-nss

[root@cisco-b22m3-01 ~]# pki-server
Usage: pki-server [OPTIONS]

  -v, --verbose                Run in verbose mode.
      --debug                  Show debug messages.
      --help                   Show help message.

Commands:
 ca                            CA management commands
 instance                      Instance management commands
 subsystem                     Subsystem management commands
 migrate                       Migrate system
 nuxwdog                       Nuxwdog related commands

pki-server command should be executable after CA packages are installed and
pkispawn of CA