Solutions to start failed after dhcpd installation

1. SELinux shutdown of Linux

By default, SELinux contains the policy for DHCP, so close SELinux and restart the DHCP service to start it


1) Temporary shutdown (no machine restart): setenforce 0       ## Set SELinux to permission mode                                                                                                  ## Setenforce 1 sets SELinux to enforcing mode

2) To modify the configuration file, you need to restart the machine: modify the/etc/SELinux/config file, change SELinux = enforcing to SELinux = disabled, and restart the machine

2. By modifying dhcpd to root, the policy management of SELinux is bypassed

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