These are my frequently used EdgeRouter OS commands for Ubiquiti’s EdgeRouter Lite (ERL).
You can enable SSH from the GUI (web interface) under System; check the box to enable the SSH server. Only enable SSH if you fully understand the risk of doing so.
Basics
# access ssh
ssh <admin username>@<EdgeRouterIP>
# enter editing mode
configure
# saving changes
# NOTE: if you did not save, a reboot should roll back the changes.
commit ; save
# or
commit ; save ; exit
# use 'exit discard' to discard the changes and exit.
# rolling back changes
# shows versions
rollback ?
# reboot and revert to a previous version
rollback 2
# NOTE: swap 'set' with 'delete' to delete the change
DNS Management
Assuming your ERL/ERX provides DHCP and is your primary DNS server.
Set A records
# set a static fqdn to an IP
set system static-host-mapping host-name <test.testdomain.com> inet <1.1.1.1>
commit
# optional 'save'
exit
# to view mappings (in config mode)
show/delete system static-host-mapping
# set a wildcard DNS name for *.example.com
set service DNS forwarding options 'address=/example.com/172.16.0.2'
Increase DNS cache on the router
# optional 'show dns forwarding statistics'
# set cache to 1000
set service dns forwarding cache-size 1000
Set DNS forwarders
# optional 'show dns forwarding nameservers'
# follow a strict order
set service dns forwarding options strict-order
# set DNS forwarders to cloud flare
set service dns forwarding name-server 1.1.1.1
set service dns forwarding name-server 1.0.0.1
Add Cloudflare DDNS provider
Set Cloudflare to handle your dynamic IP.
# set CF DDNS on the EdgeRouter
set service dns dynamic interface eth0 service custom-cloudflare host-name www.yoursite.com
set service dns dynamic interface eth0 service custom-cloudflare login your_cloudflare_email
set service dns dynamic interface eth0 service custom-cloudflare password your_cloudflare_global_API_key
set service dns dynamic interface eth0 service custom-cloudflare protocol cloudflare
set service dns dynamic interface eth0 service custom-cloudflare server www.cloudflare.com
set service dns dynamic interface eth0 service custom-cloudflare options "zone=yoursite.com"