Using array variables in Vagrantfile?

[Shashank Korada]

Hi,

I am trying to write a Vagrantfile that spins up 'N' VMs with static IPs defined my me which are defined by an environment variable(array)

export ARR_IP=("10.20.20.10" "10.20.20.11" "10.20.20.12")

Vagrantfile:

CFG_NUM = 3

CFG_IP = "${ARR_IP[*]}"

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.ssh.forward_agent = true

  (1..CFG_NUM).each do |i|

    config.vm.define CFG_NAME+"#{i}" do |s|

      s.vm.box = "ceph/ubuntu-xenial"

      s.vm.hostname = CFG_NAME+"#{i}"

      s.vm.network :private_network, ip: CFG_IP["#{i-1}"]    ====> trying to iterate over IPs

      s.vm.provider :libvirt do |v|

        v.memory = 4094

        v.cpus = 2

        v.nested = true

      end

    end

  end

end

This is throwing an error for me which says IP is nil

Error occurred while creating new network: {:iface_type=>:private_network, :netmask=>"255.255.255.0", :dhcp_enabled=>true, :forward_mode=>"nat", :ip=>nil, :protocol=>"tcp", :id=>"5d813bfc-2d27-49cf-8351-9948e73f9b66"}.

What is the correct way to substitute the array element here?

Regards

[Shashank Korada]

Turns out I cant be exporting an array in bash.

So I now want to export a variable with space separated IPs

ARR_IP="10.20.20.10 10.20.20.11 10.20.20.12"

Is there a way to break this up in the Vagrantfile? Some sort of operations?

[Alvaro Miranda Aguilera]

you can use:

["192.168.11.11", "192.168.12.12"].to_enum.with_index(1).each do |ip, i|

then you can use the ip and/or the index/counter i

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Alvaro

[Shashank Korada]

Thank you Alvaro. This certainly helps but since I am exporting a space separated(or comma separated) variable of IP addresses can I perform operations on the env var in the vagrantfile for it to become a list that u mentioned

export LIST_IP="10.10.10.10 10.10.10.11"

in Vagrantfile:

CFG_IP=$LIST_IP (some action on LIST_IP)

How can I perform some operation on the var LIST_IP in the vagrant file so that CFG_IP becomes ["10.10.10.10", "10.10.10.11"] so that its usable like the way you defined.

Regards,

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Alvaro

[Shashank Korada]

I tried to do the following:

     CFG_IP="$LIST_IPS".split(",") or CFG_IP="$LIST_IPS".split(" ")

Neither worked and added a debug to understand

DEBUG create_networks: In config found network type private_network options {:ip=>"$LIST_IPS", :protocol=>"tcp", :id=>"49129a87-dcdd-4539-a898-e2ef8b2bed38"}

Dont think the substitution worked as I had expected.

[Shashank Korada]

I got some help and the following can be done if used directly in the vagrantfile

   "10.10.10.11 10.10.10.12".scan(/\S+/)

   although I am unable to substitute the variable that I export. If before running vagrant up I export the variable

   export LIST_OF_IP="10.10.10.11 10.10.10.12"

   and the vagrantfile has the following:

   CFG_IP = ENV['LIST_OF_IP'].scan(/\S+/)

   It throws an error:

   

   Message: NoMethodError: undefined method `scan' for nil:NilClass. Any ideas on how the variable can be substituted

   CFG_IP = ENV['LIST_OF_IP'].scan(/\S+/)   ==> have also tried "$LIST_OF_IP".scan(/\S+/)

   CFG_NAME="test-vm-"

#TODO: Configure private networks and assign static ip

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.ssh.forward_agent = true

  #(1..CFG_NUM).each do |i|

  CFG_IP.to_enum.with_index(1).each do |ip, i|

    config.vm.define CFG_NAME+"#{i}" do |s|

      s.vm.box = "ceph/ubuntu-xenial"

      s.vm.hostname = CFG_NAME+"#{i}"

      s.vm.network :private_network, ip: ip

      s.vm.provider :libvirt do |v|

        v.memory = 4094

        v.cpus = 2

        v.nested = true

      end

    end

  end

end