Creating Dynamic hostname

[Abhishek Verma]

Hi All,

I am trying to setup a Vagrant machine with dynamic hostname.

I can setup hostname using "config.vm.hostname = "DummyReefServer"" in VagrantFile and it works fine.
But I wish to make this hostname dynamic , if possibile based on macaddress so everytime its unique..

Is it possible to setup hostname dunamic possibly something like this

config.vm.hostname = "DummyReefServer"+ethernet0.address

Thanks in Advance

Regards,
Abhishek

[Alvaro Miranda Aguilera]

Hello

Not sure about mac, but you can use:

SecureRandom.random_number(99999)

Adjust the number of digits.

Alvaro

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Alvaro

[Abhishek Verma]

Hi Alvaro,
Thanks for your reply. I can now create a unique mac address using
config.vm.hostname = "dummy-ngs-#{SecureRandom.random_number(9999)}"

but every time I reboot my machine , hostname gets reset.
i want to create unique hostname for machine when I create it, till i destroy it.

Any suggestions?

On Tuesday, May 2, 2017 at 8:32:55 PM UTC+1, Alvaro Miranda Aguilera wrote:

Hello

Not sure about mac, but you can use:

SecureRandom.random_number(99999)

Adjust the number of digits.

Alvaro

On Tue, May 2, 2017 at 5:34 PM, Abhishek Verma <abhishe...@uptopoint.com> wrote:

Hi All,

I am trying to setup a Vagrant machine with dynamic hostname.

I can setup hostname using "config.vm.hostname = "DummyReefServer"" in VagrantFile and it works fine.
But I wish to make this hostname dynamic , if possibile based on macaddress so everytime its unique..

Is it possible to setup hostname dunamic possibly something like this

config.vm.hostname = "DummyReefServer"+ethernet0.address

Thanks in Advance

Regards,
Abhishek

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Alvaro

[Jamie Jackson]

Maybe you could write the value to a file on the host, somewhere in
the vagrant directory (only if the file doesn't exist already), then
read it in from the file. I do a lot of this kind of thing to create
idempotent provisioners.

On Tue, May 2, 2017 at 5:33 PM, Abhishek Verma

> https://groups.google.com/d/msgid/vagrant-up/735dac67-7500-4641-9e8c-5c3d7eb4b454%40googlegroups.com.

[Alvaro Miranda Aguilera]

try something like this:

Vagrant.configure("2") do |config|

  File.open("hostname.txt", "w") {|f| f.write("dummy-ngs-#{SecureRandom.random_number(9999)}")} unless File.file?("hostname.txt")

  hostname = File.read("hostname.txt")

  config.vm.hostname = hostname

  config.vm.box = "hashicorp/precise64"

end

[Abhishek Verma]

Hey Guys , 

Thanks alot for your help.

Finally I found many ways to do the same thing. 

1. As Alvaro suggested, write to a temp file, 

2. or use Script inside VagrantFile to write to temp file

3. Create a script inside vagrant machine which runs on bootup , and repackage vagrant machine 

4. use provisioning and create a shell script next to VagrantFile which runs on bootup and configures the machine.

I went with number 4. (because i had to use macaddress not random numbers).

Although I wanted to set it up inside VagrantFile so machine has hostname before bootup, but I couldnt find out way to get macaddress and create a hostname string in VagrantFile. (New to Vagrant and dont know Ruby.)

But never mind, i got what I want .

Thanks to you all again.

Regards,

Abhishek

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[Sukhdeep Singh]

Hey Abhishek,

If you can share that shell script with me, by using which you were assigning dynamic hostname to Vagrant VM, than it will be really helpful.

I am eagerly waiting for a reply from you, and other members also who are part of this conversation.

Gmail - sukhdeepsi...@gmail.com

Mobile- 7986186510

Regards,

Sukhdeep Singh

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