Even after memeory set to 2048 in Vagrantfile the virtualbox shows 1024 allocated?

I have tried creating VM for 3rd time as docker was failing with segmentation fault due to no memory left.

So I destroyed the old vm and increased the memory to 2048 in vagrant file.

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|  # config.vm.synced_folder ".", "/vagrant"  config.vm.synced_folder ".", "/vagrant", mount_options: ["dmode=700,fmode=600"]  config.vm.box = "ubuntu/xenial64"  # config.vm.box_version = "20200901.0.0"  config.vm.box_check_update = false  config.vm.provider "virtualbox" do |v|    v.customize ["modifyvm", :id, "--vram", "2"]  end  config.vm.define "swarm-master" do |s|    s.vm.provision :shell, path: "bootstrap_ansible.sh"    s.vm.hostname = "swarm-master"    s.vm.network "public_network", ip: SWARM_MASTER_PUBLIC_IP, auto_config: true, bridge: PUBLIC_NET_BRIDGE    s.vm.network "private_network", ip: "10.100.192.200"    s.vm.provider "swarm-master" do |sm|      sm.customize ["modifyvm", :id, "--paravirtprovider", "kvm"      ]      sm.customize["modifyvm", :id, "--cpus", "2"]      sm.customize["modifyvm", :id, "--memory", "2048"]      sm.customize["modifyvm", :id, "--natdnshostresolver1"]      sm.customize["modifyvm", :id, "--name", "swarm-master"]    end    s.vm.provision "shell", inline: <<-SHELL    ansible-playbook /vagrant/provision.yml    SHELL  end

but after vagrant up, I see memory allocated is 1024 in virtualbox ! why so ?

how should I fix this ?I am using guest os Xenial which has been doing fine . I dont know why swarm node uses so much memory.