Create a name for the pool and set the network. I named this pool CAMERAPOOL

set access address-assignment pool CAMERAPOOL family inet network 10.9.5.0/24

Set the range of addresses you are going to hand out via dhcp

set access address-assignment pool CAMERAPOOL family inet range CAMERA-RANGE low 10.9.5.10
set access address-assignment pool CAMERAPOOL family inet range CAMERA-RANGE high 10.9.5.100

Set the domain name

set access address-assignment pool CAMERAPOOL family inet dhcp-attributes domain-name mydomain.com

Hand out some name servers

set access address-assignment pool CAMERAPOOL family inet dhcp-attributes name-server 94.140.14.14
set access address-assignment pool CAMERAPOOL family inet dhcp-attributes name-server 94.140.14.15

Set the default gateway. This is usually the same IP address on the interface of the SRX

set access address-assignment pool CAMERAPOOL family inet dhcp-attributes router 10.9.5.1

set up a couple of reservations

set access address-assignment pool CAMERAPOOL family inet host FRONTDOORCAM hardware-address ec:71:db:99:59:17
set access address-assignment pool CAMERAPOOL family inet host FRONTDOORCAM ip-address 10.9.5.12
set access address-assignment pool CAMERAPOOL family inet host UNDERDECKCAM hardware-address ec:71:db:c4:42:ce
set access address-assignment pool CAMERAPOOL family inet host UNDERDECKCAM ip-address 10.9.5.11

Now add it to the system services

set system services dhcp-local-server group CAMERA interface ge-0/0/0

Where: CAMERA is just a name you can assign and the interface is the interface where you want to offer up dhcp supplied addresses

Add additional “set system services dhcp-local-server group” lines for each network you want to provide dhcp services for

Tested on version 15.1X49-D211

HT: https://majornetwork.net/2014/11/juniper-srx-old-and-new-dhcp-with-problems/