Install NSCD - Name Service Cache Daemon
[root@puppet puppet-enterprise-2017.2.1-el-7-x86_64]# yum install nscd
[root@puppet puppet-enterprise-2017.2.1-el-7-x86_64]# systemctl start nscd
[root@puppet puppet-enterprise-2017.2.1-el-7-x86_64]# systemctl status nscd
● nscd.service - Name Service Cache Daemon
Loaded: loaded (/usr/lib/systemd/system/nscd.service; disabled; vendor preset: disabled)
Active: active (running) since Mon 2017-05-29 20:19:53 EDT; 7s ago
Process: 13229 ExecStart=/usr/sbin/nscd $NSCD_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 13230 (nscd)
To flush/clear DNS Cache you need to restart “nscd” service if installed.
[root@puppet puppet-enterprise-2017.2.1-el-7-x86_64]# systemctl restart nscd