FLY_CONSUL_URL no such host

Questions / Help
1

Wanting to play with Consul I’ve created a simple Go app with Consul client:

client, err := api.NewClient(&api.Config{
	Address: os.Getenv("FLY_CONSUL_URL"),
})

Trying to access the KV store I see this:

Put "https://:26c4294a-b440-b543-1ae7-79620e7f15e5%40consul-fra-8.fly-shared.net/evcc-consul-4nml16r0rp51vp2y//v1/kv/value?cas=0": dial tcp: lookup :26c4294a-b440-b543-1ae7-79620e7f15e5@consul-fra-8.fly-shared.net: no such host

The Consul URL looks clearly wrong, both the starting : in the host name as the //v1.

2

Ah, part of the confusion comes from Go consul module HTML-escaping the error message which seems to explain the %40. The plain FLY_CONSUL_URL is this:

https://:26c4294a-b440-b543-1ae7-79620e7f15e5@consul-fra-8.fly-shared.net/evcc-consul-4nml16r0rp51vp2y/

Still, the connection error remains:

dial tcp: lookup :26c4294a-b440-b543-1ae7-79620e7f15e5@consul-fra-8.fly-shared.net: no such host

Looks as if consul is not connected. May be worth noting that the machines are in the AMS region while the consule url seems to indicate FRA?

3

Next issue is the // due to fly url containing trailing /. This must not be passed as address in the config, hence

Address: strings.TrimRight(os.Getenv("FLY_CONSUL_URL"), "/"),

. Still, TCP lookup problem remains :frowning:

4

Any idea what to do about the no such host for Consul detaching/re-attaching doesn’t help.

5

@tvdfly any chance to look into this? Just recreated the app, with same result. Attached Consul host is not reachable.

6

Gave it one last try:

u, err := url.Parse(os.Getenv("FLY_CONSUL_URL"))
if err != nil {
	panic(err)
}

config := &api.Config{
	Address: u.Host,
	Scheme:  u.Scheme,
}
if u.User != nil {
	config.Token, _ = u.User.Password()
}

client, err := api.NewClient(config)
if err != nil {
	panic(err)
}

finally results in

response code: 403 (rpc error making call: Permission denied)

Giving up :open_mouth:

7

I’m still stuck with connecting to Consul. Is that really not possible???

8

Still looking for a solution.

9

See the Sneak peak: global lock service post for details on this service and the structure of the FLY_CONSUL_URL variable.

Specifically, I think you’re missing this part:

the path section (/app-name-23sxdf ) is the prefix that token has write access to.

If I understand this correctly you need to make sure the Name field in any queries you send to the Consul service start with the provided path prefix, e.g., evcc-consul-4nml16r0rp51vp2y/. Hope this helps!

10

Thank you so much- this wasn’t obvious for me, thank you!

11

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.