CentOS

[fnordfish]

CentOS 7

Install epel-release, enable base and update repos, don't upgrade kernel.

Vagrant.configure("2") do |config|
  config.vm.define "my_cent_os_box" do |c|
    c.box = "centos/7"
    c.vbguest.installer_hooks[:before_install] = ["yum install -y epel-release", "sleep 1"]
    c.vbguest.installer_options = { allow_kernel_upgrade: false , enablerepo: true }
  end
end

CentOS 8

Install epel-release, don't enable any specific repos, upgrade kernel.

Vagrant.configure("2") do |config|
  config.vm.define "my_cent_os_box" do |c|
    c.box = "centos/8"
    c.vbguest.installer_hooks[:before_install] = ["yum install -y epel-release", "sleep 1"]
    c.vbguest.installer_hooks[:after_install] = ["/sbin/rcvboxadd quicksetup all"]
    c.vbguest.installer_options = { allow_kernel_upgrade: true }
  end
end