Hi There!
I want to use nomad to replace docker-compose. In docker compose, you can specify the dependent containers and you will be able to reach the container with the name.
# DB Container
db:
image: 'mysql:8.0'
....
# App Container
app:
.....
depends_on:
- db
Things doesn’t seem that easy with nomad somehow! it feels i have to dig deep to understand the networking part or use consul. I have this basic test job that creates mysql container and another application container.
job "hippo_services_db" {
datacenters = ["dc1"]
group "services" {
volume "mysql_data" {
type = "host"
read_only = false
source = "mysql_data"
}
network {
port "mysql_srv" {
static = 3306
}
port "toad_srv" {
static = 8080
}
}
task "mysql" {
driver = "docker"
volume_mount {
volume = "mysql_data"
destination = "/var/lib/mysql"
read_only = false
}
config {
image = "mysql:8.0"
ports = ["mysql_srv"]
}
env {
MYSQL_ROOT_PASSWORD = "root"
MYSQL_DATABASE = "hippo"
MYSQL_USER = "hippo"
MYSQL_PASSWORD = "m06rs011e9h9ihuboi7s"
MYSQL_ALLOW_EMPTY_PASSWORD = "no"
}
resources {
cpu = 100
memory = 900
}
}
task "toad" {
driver = "docker"
config {
image = "clivern/toad:release-0.2.4"
ports = ["toad_srv"]
command = "./toad"
args = [
"--port",
"${NOMAD_PORT_toad_srv}",
]
}
env = {
IS_STATEFUL = "false",
}
resources {
network {
mbits = 10
}
}
}
}
}
from the application container toad i want to access the mysql container. You can install mysql client inside toad container as explained below. so far i can’t reach the database container from the app container.
$ docker ps
# Get the toad app container id
$ docker exec -it $ID bash
$ apt-get update && apt-get install -y git curl libmcrypt-dev default-mysql-client
$ mysql -h $IP -P 3306 -u root -proot
I am struggling with this for a day or so! any help would be much appreciated!
