Bootstrap: fluid layout with no external margin

If i understand your question correctly, I believe you want this:

.container-fluid {
    padding: 0px;
}

Also if you are using responsive bootstrap you will also want this:

@media (max-width: 797px) {
    body { 
        padding-left: 0px;
        padding-right: 0px;
    }
}

Edit: here is a js fiddle.