Hello, I try to do simple nomad job, Go GET request from external services.
As what expected, I get status code response 200.
output from 'main.go'
``
2022/09/30 19:35:02 …
2022/09/30 19:35:02 200
When I uncomment resp, err := http.Get("http://127.0.0.1:9001") to be use inside nomad job. The nomad logs give me this,
2022/09/30 11:33:16 no healthy upstream
2022/09/30 11:33:16 503
What I do first, is I compile my go program and build docker image for test.nomad
env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o ./main ./main.go
docker build . -t test:0.0.0
Next, I run consul and nomad in dev mode in separting terminal.
consul agent -dev -log-level DEBUG
sudo nomad agent -dev-connect -bind 0.0.0.0 -log-level DEBUG -config nomad-config/
Then, I register external services into consul. I follow this tutorial.
curl --request PUT --data @external.json localhost:8500/v1/catalog/register
consul config write external-defaults.hcl
After that I start terminating gateway and start the application
terminating.nomad
# terminating.nomad file
job "terminating" {
datacenters = ["dc1"]
type = "service"
group "gateway" {
network {
mode = "bridge"
}
service {
name = "api-gateway"
connect {
gateway {
proxy {}
terminating {
service {
name = "learn"
}
}
}
}
}
}
}
test.nomad
# test.nomad file
job "test" {
datacenters = ["dc1"]
type = "batch"
group "app" {
network {
mode = "bridge"
}
service {
name = "test"
connect {
sidecar_service {
proxy {
upstreams {
destination_name = "learn"
local_bind_port = 9001
local_bind_address = "127.0.0.1"
}
}
}
}
}
task "app" {
driver = "docker"
config {
image = "test:0.0.0"
}
resources {
cpu = 500
memory = 256
}
}
}
}
nomad run terminating.nomad
nomad run test.nomad
You can see here the at the topology from test services connecting to learn which is the external services through terminating gateway inside consul.
Here’s the log coming from terminating.nomad-log job.
terminating.nomad-log.txt (41.6 KB)
Thank you.
Ref: My tree for this project looks like this and can check my repo here.
├── Dockerfile
├── external-defaults.hcl
├── external.json
├── main
├── main.go
├── nomad-config
│ └── debug.hcl
├── terminating.nomad
└── test.nomad