How to use docker cli in golang to create subnet - docker

Question

I'm trying to create a docker network for my application written in Golang.
I'm aware that I can use this NetworkCreate function, but I'm not sure how to specify the network option.
In the regular terminal console, I can just create the network with
docker network create -d bridge --subnet=174.3.12.5/16 mynet
But how to use the NetworkCreate() as an equivalent for this network creation?

Answer 1

package main
import (
"context"
"fmt"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/network"
"github.com/docker/docker/client"
)
func main() {
cli, err := client.NewClientWithOpts(client.FromEnv)
if err != nil {
fmt.Println(err)
}
newnetwork := types.NetworkCreate{IPAM: &network.IPAM{
Driver: "default",
Config: []network.IPAMConfig{network.IPAMConfig{
Subnet: "174.3.12.5/16",
}},
}}
res, err := cli.NetworkCreate(context.Background(), "test", newnetwork)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(res)
}
this is a minimal implementable example. the name for driver is default.

Answer 2

You can specify the network options via the NetworkCreate options struct.
If you want to convert the command docker network create -d bridge --subnet=174.3.12.5/16 mynet to a golang equivalent, It'll look something like this:
networkResponse, err := client.NetworkCreate(context.Background(), "mynet", types.NetworkCreate{
Driver: "bridge",
IPAM: &network.IPAM{
Config: network.IPAMConfig{
Subnet: "174.3.12.5/16",
},
},
})

Answer 3

You can use exec.Command(...).CombinedOutput()