Redirect port 3080/3443 to 80/443 for local dev

localPorts.sh

#Requests from outside
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 3080
iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 3443

#Requests from localhost
iptables -t nat -I OUTPUT -p tcp -d 127.0.0.1 --dport 80 -j REDIRECT --to-ports 3080
iptables -t nat -I OUTPUT -p tcp -d 127.0.0.1 --dport 443 -j REDIRECT --to-ports 3443

Set the app to listen on port 3000/3443 or whatever you want, anything over 1024 is fine to use as a normal user. Then sudo run those iptables commands and it should forward any traffic from ports 80/443 to 3000/3443. If you want them to persist across reboots, stick them in a startup script somewhere like /etc/rc.local

The above only works on linux. For a mac, it might be something like:

sudo ipfw add 100 fwd 127.0.0.1,3000 tcp from any to any 80 in
sudo ipfw add 200 fwd 127.0.0.1,3443 tcp from any to any 443 in

And for Yosemite:

/etc/pf.anchors/mindflash

rdr pass inet proto tcp from any to any port = 80 -> 127.0.0.1 port 3080
rdr pass inet proto tcp from any to any port = 443 -> 127.0.0.1 port 3443

Note: Trailing line break is important.

Insert rdr-anchor "mindflash" and load anchor "mindflash" from "/etc/pf.anchors/mindflash" at correct places in /etc/pf.conf, so that it looks like this:

scrub-anchor "com.apple/*"
nat-anchor "com.apple/*"
rdr-anchor "com.apple/*"
rdr-anchor "mindflash"  # mindflash port forwarding
dummynet-anchor "com.apple/*"
anchor "com.apple/*"
load anchor "com.apple" from "/etc/pf.anchors/com.apple"
load anchor "mindflash" from "/etc/pf.anchors/mindflash"  # mindflash port forwarding

Hi.
After applying that jenkins worked fine, but docker daemon which was installed on the same node got crazy: all http requests from a docker container got 404 Not Found. I suppose the requests were redirected to localhost for some reason and obviously could not be handled.

I'm on Ubuntu 16