Dublin Ferry Port

As our departure for France looms ever closer, we're preparing for our first experience of Dublin Port as opposed to Rosslare. (Thanks very much, Irish Ferries....tough on the West Cork customers, not to mention the good people of Rosslare btw)
Anyway, we're still looking for an overnight stop reasonably near the port.
We could use Camac Valley, but would prefer somewhere closer (and cheaper!)....so can anyone recommend a guaranteed place to park up? By that, I mean somewhere that they have recently used with no problems. Thanks in advance btw.

Salmon Leap Leixlip it's on the App.

Thanks for the tip, but does that mean overnight parking is ok, or just daytime?

Are you sure you don’t pay overnight in Coal Harbour?
Also when you go over East Link bridge Toll, going towards Dublin Port if you need fuel, turn down East Wall you will see Lidl/McDonalds on left and on opposite side Aldi with, Campus for fuel next door, usually good price
.
When finished retrace your steps back up East Wall Road and turn left and swing around into Dublin Port.

Daffysparks I don’t know D4 service station where is it?

Rosemary, you only pay 8to8 €4 for the day.
D4 fuel's is on the corner of Baggot lane and Northumberland Rd. Ballsbridge .Diesel €1.25.9.
Then if going to the port, drive on to the lights turn right on to Haddington rd, (R111) then down Bath ave, Londonbridge rd, Sean Moor rd ( R131) to the Roundwood and then the East Link Toll.

Martin we go coast road from Dun Laoghaire, through Blackrock, cross railway track at Merrion Gates, Sandymount, East Link toll, rarely go via Ballsbridge. Unless a huge saving, I wouldn’t go out of my way, too many traffic lights, I don’t know why I always get red even when no traffic.