Many thanks for your feedback. 

I have followed below step now :

1. halted ( *vagrant halt ) *the vm. Edited the Vagrantfile as advised( 
kept the core section by default). i,e :

* config.vm.provider "virtualbox" do |vb|*
*  #   # Display the VirtualBox GUI when booting the machine*
*  #   vb.gui = true*
*  #*
*  #   # Customize the amount of memory on the VM:*
*      vb.memory = "4096"*
*  #   vb.cpus = 4*


*  end*
2. Start the vm ( 
*vagrant up <vm_name>). *3. Logged into the vm and checked the memory, 
Below is the output, where memory is showing but it's not reflecting 
assigned 4GB memory.

*vagrant@db:~$ free -m*

*                    total        used        free      shared  buff/cache  
 available*
*Mem:            992          50         576           3         365        
 788*
*Swap:               0           0           0              -            -  
            -*


Thanks 

On Tuesday, 4 September 2018 16:08:05 UTC+5:30, Alvaro Miranda Aguilera 
wrote:
>
> Hello
>
> The Virtualbox need to be un commented
>
>
> so this
>
> *# config.vm.provider "virtualbox" do |vb|*
> *  #   # Display the VirtualBox GUI when booting the machine*
> *  #   vb.gui = true*
> *  #*
> *  #   # Customize the amount of memory on the VM:*
> *      vb.memory = "4096"*
> *      vb.cpus = 8*
> *  # end*
>
>
> *Need to change into*
>
>
>
> * config.vm.provider "virtualbox" do |vb|*
> *  #   # Display the VirtualBox GUI when booting the machine*
> *  #   vb.gui = true*
> *  #*
> *  #   # Customize the amount of memory on the VM:*
> *      vb.memory = "4096"*
> *      vb.cpus = 4*
> *  end*
>
> *you got 8 cores? 4 cores? I will keep that low to real cores.*
>
> *alvaro.*
>
> On Tue, Sep 4, 2018 at 10:03 AM Bot_Learn <[email protected] 
> <javascript:>> wrote:
>
>> Hi Alvaro,
>>
>> My host machine have 8GB memory. Please find below my vagrantfile ( for 
>> ubuntu) -
>>
>> *$ cat Vagrantfile*
>> *# -*- mode: ruby -*-*
>> *# vi: set ft=ruby :*
>>
>> *# All Vagrant configuration is done below. The "2" in Vagrant.configure*
>> *# configures the configuration version (we support older styles for*
>> *# backwards compatibility). Please don't change it unless you know what*
>> *# you're doing.*
>> *Vagrant.configure("2") do |config|*
>> *  # The most common configuration options are documented and commented 
>> below.*
>> *  # For a complete reference, please see the online documentation at*
>> *  # https://docs.vagrantup.com <https://docs.vagrantup.com>.*
>>
>> *  # Every Vagrant development environment requires a box. You can search 
>> for*
>> *  # boxes at https://vagrantcloud.com/search 
>> <https://vagrantcloud.com/search>.*
>> *  config.vm.box = "ubuntu/trusty64"*
>>
>> *  # Disable automatic box update checking. If you disable this, then*
>> *  # boxes will only be checked for updates when the user runs*
>> *  # `vagrant box outdated`. This is not recommended.*
>> *  # config.vm.box_check_update = false*
>>
>> *  # Create a forwarded port mapping which allows access to a specific 
>> port*
>> *  # within the machine from a port on the host machine. In the example 
>> below,*
>> *  # accessing "localhost:8080" will access port 80 on the guest machine.*
>> *  # NOTE: This will enable public access to the opened port*
>> *  # config.vm.network "forwarded_port", guest: 80, host: 8080*
>>
>> *  # Create a forwarded port mapping which allows access to a specific 
>> port*
>> *  # within the machine from a port on the host machine and only allow 
>> access*
>> *  # via 127.0.0.1 to disable public access*
>> *  # config.vm.network "forwarded_port", guest: 80, host: 8080, host_ip: 
>> "127.0.0.1"*
>>
>> *  # Create a private network, which allows host-only access to the 
>> machine*
>> *  # using a specific IP.*
>> *  # config.vm.network "private_network", ip: "192.168.33.10"*
>>
>> *  # Create a public network, which generally matched to bridged network.*
>> *  # Bridged networks make the machine appear as another physical device 
>> on*
>> *  # your network.*
>> *  # config.vm.network "public_network"*
>>
>> *  # Share an additional folder to the guest VM. The first argument is*
>> *  # the path on the host to the actual folder. The second argument is*
>> *  # the path on the guest to mount the folder. And the optional third*
>> *  # argument is a set of non-required options.*
>> *  # config.vm.synced_folder "../data", "/vagrant_data"*
>>
>> *  # Provider-specific configuration so you can fine-tune various*
>> *  # backing providers for Vagrant. These expose provider-specific 
>> options.*
>> *  # Example for VirtualBox:*
>> *  #*
>> *  # config.vm.provider "virtualbox" do |vb|*
>> *  #   # Display the VirtualBox GUI when booting the machine*
>> *  #   vb.gui = true*
>> *  #*
>> *  #   # Customize the amount of memory on the VM:*
>> *      vb.memory = "4096"*
>> *      vb.cpus = 8*
>> *  # end*
>> *  #*
>> *  # View the documentation for the provider you are using for more*
>> *  # information on available options.*
>>
>> *  # Enable provisioning with a shell script. Additional provisioners 
>> such as*
>> *  # Puppet, Chef, Ansible, Salt, and Docker are also available. Please 
>> see the*
>> *  # documentation for more information about their specific syntax and 
>> use.*
>> *  # config.vm.provision "shell", inline: <<-SHELL*
>> *  #   apt-get update*
>> *  #   apt-get install -y apache2*
>> *  # SHELL*
>> *end*
>>
>> On Tuesday, 4 September 2018 11:58:01 UTC+5:30, Alvaro Miranda Aguilera 
>> wrote:
>>>
>>> Hello.
>>>
>>> If you could share the Vagrantfile to confirm syntax is correct will help
>>>
>>> How much memory your host computer have?
>>>
>>> On Tue, Sep 4, 2018 at 1:53 AM Bot_Learn <[email protected]> wrote:
>>>
>>>> I am bit new to vagrant. Created three virtual machines using vagrant. 
>>>> I need 4GB memory to be assigned in a virtual machine( presently having 
>>>> less than 1GB memory on that). 
>>>> I have edited the vagrantfile and tried to restart the vm ( using *vagrant 
>>>> up <vm_name> *) but it's still showing old memory there. 
>>>>
>>>> Can anyone please advise how i can increase memory size here? 
>>>>
>>>> Thanks
>>>>
>>>> -- 
>>>> This mailing list is governed under the HashiCorp Community Guidelines 
>>>> - https://www.hashicorp.com/community-guidelines.html. Behavior in 
>>>> violation of those guidelines may result in your removal from this mailing 
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>>>>  
>>>> GitHub Issues: https://github.com/mitchellh/vagrant/issues
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>>>> To view this discussion on the web visit 
>>>> https://groups.google.com/d/msgid/vagrant-up/9ccb0eaa-3035-4206-9440-8610b850d3a2%40googlegroups.com
>>>>  
>>>> <https://groups.google.com/d/msgid/vagrant-up/9ccb0eaa-3035-4206-9440-8610b850d3a2%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>> .
>>>> For more options, visit https://groups.google.com/d/optout.
>>>>
>>>
>>>
>>> -- 
>>> Alvaro
>>>
>>> -- 
>> This mailing list is governed under the HashiCorp Community Guidelines - 
>> https://www.hashicorp.com/community-guidelines.html. Behavior in 
>> violation of those guidelines may result in your removal from this mailing 
>> list.
>>  
>> GitHub Issues: https://github.com/mitchellh/vagrant/issues
>> IRC: #vagrant on Freenode
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>> To unsubscribe from this group and stop receiving emails from it, send an 
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>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/vagrant-up/f6de2df9-1b51-4dc9-95e8-4c9f3bc7614a%40googlegroups.com
>>  
>> <https://groups.google.com/d/msgid/vagrant-up/f6de2df9-1b51-4dc9-95e8-4c9f3bc7614a%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
> -- 
> Alvaro
>
>

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