Multimachine infrastructure: how would you share data among nodes?

[Bjorn W]

Hi,
I'm using Vagrant to model a production environment with 5 machines:

- 1 database server
- 1 storage server
- 2 webservers
- 1 loadbalancer.

So far most of it works as theorized except for storage.

My initial idea was to sync shared folders from my host laptop via Vagrant to the storage server VM and run a NFS server re-sharing the shared Vagrant folders the (guest) from storage server to, in this case, the webservers. However sharing synced (tried both default as well as NFS) Vagrant folders using this approach does not work: the storage server mounts the shared Vagrant folder and allows access to it. I can see a mount and I'm able to write something to it (on the webserver machine and see the result on the storage server as well). However existing folders on the storage server seem empty when I view them from the webserver machine. Any clues on what is causing this? Also I'm interested in how you would model a production environment like I described and in particular how would you share data (between the guest VM's as well as between the host and the guest VM's). 

ps: For now I'm going to test a workaround: Using Vagrant shared folders as the storage machine instead. So basically I mount the shared folders on the webserver VM's directly instead of via a storage server.
 

[Alvaro Miranda Aguilera]

How is done in production today?

You can easily add a 2nd disk to the storage server, and then use it
for anything you like.

Sample Vagrant file with 1 extra disk

vm_name="db12102"
size_file_to_dbdisk = 50

Vagrant.configure(2) do |config|
config.vm.box = "alvaro/oracle6-preinstall"
config.vm.hostname = "#{vm_name}.kikitux.net"
config.vm.network :private_network, ip: "192.168.78.3"
config.vm.provider :virtualbox do |vb|
vb.name = vm_name
vb.customize ["modifyvm", :id, "--memory", 5555]
vb.customize ["modifyvm", :id, "--cpus", 4]
port=2
["1"].each do |disk|
file_to_dbdisk = "Y:/VirtualBox/#{vm_name}/#{vm_name}-disk#{disk}.vdi"
if !File.exist?(file_to_dbdisk)
vb.customize ['createhd', '--filename', file_to_dbdisk,
'--size', (size_file_to_dbdisk * 1024).floor ]
end
vb.customize ['storageattach', :id, '--storagectl', 'SATA
Controller', '--port', port, '--device', 0, '--type', 'hdd',
'--medium', file_to_dbdisk]
port=port+1
end
end
config.vm.provision "shell", path: "scripts/sdb.sh"

end



Sample script that won't delete if there is anything in the disk

#!/bin/bash

blkid /dev/sdb*
if [ $? -ne 0 ]; then
mkfs.ext4 -F /dev/sdb
blkid /dev/sdb 2>&1>/dev/null && echo $(blkid /dev/sdb -o export |
head -n1) /u01/stage ext4 defaults 0 0 >> /etc/fstab
mkdir -p /u01/stage
mount /u01/stage
else
echo "filesystem metadata found on sdb, ignoring"
fi



Alvaro

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[pixel fairy]

can you show us?

ive done similar things, but usually use ansibles synchronize module or just work from /vagrant

[BjornW]

Hi,

My solution ended up using mounted directories from Vagrant and sharing
uploaded files via the NFS server.

grtz
BjornW

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