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According to the official Virtuozzo 7 information, the proper and reliable way to use OpenVZ 7 virtualization is to deploy the server using Virtuozzo 7 ISO image from https://download.openvz.org/virtuozzo/releases/7.0/x86_64/iso/

If due to whatever reason there is no way to deploy the server using ISO, there is also a way to convert CentOS 7 to VZ7. 

Note that steps below are a sample one and are performed on your own risk.

Preparing CentOS 7 for conversion

Before proceeding with installing vzkernel, it is required to prepare the server to match the requirements of Virtuozzo 7. The main part here is to have a dedicated EXT4 partition mounted on /vz.

Mount a specifically created partition or a logical volume (it's a preferable way, it will be easier to extend it if required). The file system on the partition/volume must be ext4. Do not forger to add the corresponding mount point to /etc/fstab.

Here are the sample steps on how to achieve that in case there is a second drive /dev/sdb. Note that steps are just an example.


# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 64G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 21G 0 part
├─centos-root 253:0 0 20G 0 lvm /
└─centos-swap 253:1 0 1G 0 lvm [SWAP]
sdb 8:16 0 64G 0 disk

# vgcreate vz /dev/sdb
Physical volume "/dev/sdb" successfully created.
Volume group "vz" successfully created

# lvcreate -n vz -l 100%FREE /dev/vz
Logical volume "vz" created.

# mkfs.ext4 /dev/vz/vz

# mkdir /vz

# mount /dev/vz/vz /vz
# echo "/dev/vz/vz /vz ext4 defaults 1 1" >> /etc/fstab


Overall The result should be similar to the following one:

# df -hT /vz
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vz-vz ext4 50G 827M 46G 2% /vz


Type must be ext4 and it must be me mounted on /vz.

Doing the conversion

Once /vz partition is prepared, we can go ahead with the conversion.

  1. First, make sure that server is up-to-date and reboot it to apply the updates:

    # yum update -y
# reboot

  2. Then, install python subprocesses, the latest OpenVZ 7 release, Epel repository, prctl utility, OpenVZ kernel and ploop packages:

    # yum localinstall https://download.openvz.org/virtuozzo/releases/openvz-7.0.11-235/x86_64/os/Packages/p/python-subprocess32-3.2.7-1.vz7.5.x86_64.rpm
# yum localinstall https://download.openvz.org/virtuozzo/releases/openvz-7.0.11-235/x86_64/os/Packages/o/openvz-release-7.0.11-3.vz7.x86_64.rpm
# yum install epel-release -y
# yum install prlctl prl-disp-service vzkernel *ploop*
  3. Reboot the server to boot it into OpenVZ kernel:
    # reboot

  4. Now, enable ploop kernel modules:

    # modprobe ploop
# modprobe pfmt_ploop1
# modprobe pfmt_raw
# modprobe pio_direct

The conversion is done. Feel free to try installing SolusVM on it: 

# curl -o install.sh https://docs.solusvm.com/download/attachments/27428206/install.sh && sh install.sh

In case you did everything right, you will see the following screen on CentOS 7:

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