Figured it out. The custom key that I am using should be appended to the 
default vagrant key - ~/.vagrant.d/insecure_private_key

So this config

    slave.ssh.private_key_path = ["keys/id_rsa_slave"]

Should be changed to

    slave.ssh.private_key_path = ["keys/id_rsa_slave", 
"~/.vagrant.d/insecure_private_key"]

After making this change, I ran

> vagrant up

And it came up successfully.


On Saturday, May 16, 2020 at 10:07:43 PM UTC+5:30, Gokul wrote:
>
> *Below is my Vagrantfile*
>
> # -*- mode: ruby -*-
>
> # vi: set ft=ruby :
>
>
> #Virtualbox host and vagrant host/network confs
>
> #
>
> Vagrant.configure("2") do |config|
>
>   config.vm.define "slave" do |slave|
>
>     slave.vm.box = "centos/7"
>
>     slave.vm.hostname = "slave.ansible.com"
>
>     slave.vm.network :private_network, ip: "192.168.99.102"
>
>     slave.ssh.insert_key = false
>
>     slave.vm.boot_timeout = 800
>
>     slave.ssh.private_key_path = ["keys/id_rsa_slave"]
>
>     slave.vm.provision "file", source: "keys/id_rsa_slave.pub", 
> destination: "~/.ssh/authorized_keys"
>
>   end
>
>
>     config.vm.provider "virtualbox" do |vb|
>
>       vb.cpus = "1"
>
>       vb.memory = "512"
>
>     end
>
>
>
> *This Vagrantfile sits in the slave folder under my home directory 
> (/user/gokul/slave) and under this, I have keys directory with below keys 
> and appropriate permissions*
>
>
> (base) Gokul:slave gokul$ ls -lt keys/
>
> total 16
>
> -rw-------  1 gokul  gokul   565 May 16 18:30 id_rsa_slave.pub
>
> -rw-------  1 gokul  gokul  2590 May 16 18:30 id_rsa_slave
>
>
>
> *Permission of the keys directory is also fine*
>
> (base) Gokul:slave gokul$ ls -ld keys/
>
> drwx------  4 gokul  gokul  128 May 16 18:30 keys/
>
>
>
> *Now I run below command to get my vagrant box up*
>
>
> *vagrant up*
>
>
> *And it hangs at this point failing to authenticate*
>
> ==> master: Waiting for machine to boot. This may take a few minutes...
>
>     master: SSH address: 127.0.0.1:2200
>
>     master: SSH username: vagrant
>
>     master: SSH auth method: private key
>
>     master: Warning: Authentication failure. Retrying...
>
>     master: Warning: Authentication failure. Retrying...
>
>
> SSH authentication failed! This is typically caused by the public/private
>
> keypair for the SSH user not being properly set on the guest VM. Please
>
> verify that the guest VM is setup with the proper public key, and that
>
> the private key path for Vagrant is setup properly as well.
>
>
> *With debug enabled also I can see that it picks up the private key that 
> I've asked to, however, it fails to authenticate successfully and fails 
> with above error. What am I missing?*
>

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