Consider you are building multiple containers with networking using docker-compose and for some reason you want to do the same thing in vagrant, how can it be done?
Here is a example:
First the working docker-compose setup. In this example we will build docker containers for mysql
and phpmyadmin
. phpmyadmin
will be connected to the mysql
container instance with in the same network.
version: '3.7'
services:
db:
image: mysql:5.7.36
restart: always
environment:
MYSQL_ROOT_PASSWORD: root
MYSQL_DATABASE: test_db
ports:
- "3308:3306"
phpmyadmin:
image: phpmyadmin/phpmyadmin:latest
restart: always
environment:
PMA_HOST: db
PMA_USER: root
PMA_PASSWORD: root
ports:
- "8080:80"
Lets do the same thing in vagrant
.
# -*- mode: ruby -*-
# vi: set ft=ruby :
# This file works exactly like the docker-compose.yml file.
Vagrant.configure("2") do |config|
config.vm.network :private_network, type: "dhcp"
config.vm.define "mysql" do |db|
# Without prot forwardign vagrant entwork doesnt work
db.vm.network "forwarded_port", guest: 3306, host: 3306
db.vm.hostname = "mysqldb"
db.vm.provider "docker" do |d|
d.image = "mysql:5.7.36"
d.env = {
:MYSQL_ROOT_PASSWORD => "root",
:MYSQL_DATBASE => "test_db"
}
d.remains_running = "true"
end
end
config.vm.define "phpmyadmin" do |pa|
pa.vm.network "forwarded_port", guest: 80, host: 8080
pa.vm.hostname = "phpmyadmin"
pa.vm.provider "docker" do |d|
d.image = "phpmyadmin/phpmyadmin:latest"
d.env = {
:PMA_HOST => "mysqldb",
:PMA_USER => "root",
:PMA_PASSWORD => "root",
# Without specifying the specific port phpmyadmin container doesn't work
:PMA_PORT => "3306",
}
d.remains_running = "true"
end
end
end
Unlike docker-compose
it is not possible to set a direct dependency in vagrant
. But it is possible to do a sequential build by setting the option --no-parallel
eg:- vagrant up --no-parallel
.
Even though docker-compose
has the dependency set, the dependency is only to the extent of waiting for the dependent container to be built but not waiting for the services in the container to be up and running.
Hence even after building sequentially in vagrant
, the dependent services failed to connect. It did not matter vagrant
or docker-compose
. Services with in the containers need to wait for their dependent services to be up.
So I added a delay in the dependent containers in a timed loop, the dependent service will attempt to connect and upon failure will wait for 30 seconds to connect again, after 10 attempts it gives up.
Top comments (1)
I've first asked the question in stackoverflow and later answered my own question. This question has been voted to be closed in need of clarity :((