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Virtualbox-notes.md

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VirtualBox Notes:

Some useful notes, if you're planning to use docker in virtualbox.

Shared folders:

On Host:

Assuming:

  • The VM NAME is CentOS-Docker.
  • The shared folder called Media-Data.
  • The shared folder path is /srv/Media.

To add a shared folder:

VBoxManage sharedfolder add "CentOS-Docker" --name "Media-Data" --hostpath "/srv/Media"

To remove a shared folder:

VBoxManage sharedfolder remove "CentOS-Docker" --name "Media-Data"

To find the IDE Controller device numbers:

VBoxManage showvminfo "CentOS-Docker" | grep "Storage Controller Name"

To find the port and device numbers of the IDE controller: (#port, #device)

VBoxManage showvminfo "CentOS-Docker" | grep "IDE"

    If you didn't find it, you can add it:

VBoxManage storagectl "CentOS-Docker" --name "IDE" --add ide

To attach the VBoxGuestAdditions.iso as dvd drive:

Assuming:

  • Storage controller name is IDE.
  • Storage controller port is 1.
  • Storage controller device is 0.
  • VBoxGuestAdditions.iso location is /usr/share/virtualbox/VBoxGuestAdditions.iso.
VBoxManage storageattach "CentOS-Docker" --storagectl "IDE" --port 1 --device 0 --type dvddrive --medium /usr/share/virtualbox/VBoxGuestAdditions.iso

    To find out where is VBoxGuestAdditions.iso:

find / -path /mnt -prune -o -name 'VBoxGuestAdditions*.iso'

    If you have the virtualbox-guestadditions packages installed on your host, then you can alternatively try:

VBoxManage storageattach "CentOS-Docker" --storagectl "IDE" --port 1 --device 0 --type dvddrive --medium additions

To detach the VBoxGuestAdditions.iso:

VBoxManage storageattach "CentOS-Docker" --storagectl "IDE" --port 1 --device 0 --type dvddrive --medium emptydrive

    If that didn't work, just force it:

VBoxManage storageattach "CentOS-Docker" --storagectl "IDE" --port 1 --device 0 --type dvddrive --medium emptydrive --forceunmount

On Guest:

  1. Install the Guest Additions.

On CentOS 7 and RedHat (RHEL) 7, we need to add (EPEL) repo:

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum update

Then install the following needed packages:

yum install gcc kernel-devel kernel-headers dkms make bzip2 perl

Now, Add KERN_DIR environment variable:

KERN_DIR=/usr/src/kernels/`uname -r`/build
export KERN_DIR

Create the MOUNTPOINT and mount VBoxGuestAdditions.iso:

mkdir /media/cdrom0
mount -t iso9660 -o ro /dev/cdrom /media/cdrom0

Install VBoxGuestAdditions:

cd /media/cdrom0
./VBoxLinuxAdditions.run

    If you're installing it on a server without GUI, add this flag: --nox11.

When we're done, let's unmount it:

umount /media/cdrom0

Then remove the attached ISO from host.

Finally, just reboot:

rebooot
  1. Tell the guest-os about our shared folder:

Assuming:

  • The shared folder called Media-Data.
  • The MOUNTPOINT in the guest-os is /mnt/Media.
  • The UserID is 1000.
  • We want the read and write permissions.

Modify /etc/fstab and add the following:

Media-Data      /mnt/Media      vboxsf  uid=1000,rw      0       0

Macvlan Network:

If you use VirtualBox, you will have to update your VM network settings. Open the settings panel for the VM, go the the "Network" tab, pull down the "Advanced" settings. Here, the "Adapter Type" should be pcnet (the full name is something like "PCnet-FAST III"), instead of the default e1000 (Intel PRO/1000). Also, "Promiscuous Mode" should be set to "Allow All".

If you don't do that, bridged containers won't work, because the virtual NIC will filter out all packets with a different MAC address. If you are running VirtualBox in headless mode, the command line equivalent of the above is modifyvm --nicpromisc1 allow-all.. Source