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Use a custom ISO image to install operating systems that are not available as built-in VMmanager templates. Provide a public HTTP or HTTPS URL to an ISO image (up to 8 GB). VMmanager downloads the image, mounts it as a bootable disk, and restarts the server from it. Only one ISO image can be mounted on a server at a time.
Installing from ISO erases all data on the server disk. Back up any important files before proceeding.
1

Open VMmanager 6

In the Gcore Hosting Portal, navigate to Products/Services → Virtual private servers, select the server checkbox, and click To panel.
Virtual private servers list with a server row selected and the To panel button highlighted in the toolbar
2

Open the ISO mount dialog

In VMmanager 6, go to the Virtual machines list. Open the three-dot menu on the right side of the server row and select Mount ISO-image.
VMmanager 6 virtual machines list with the three-dot menu open and Mount ISO-image option highlighted
3

Enter the ISO image URL

In the URL field, enter a direct link to the ISO file.
Upload ISO-image page with URL field and Tags field
Add Tags to trigger VMmanager automation scripts that use matching tag values.
4

Download and connect

Click Download and connect. VMmanager downloads the ISO image, mounts it as a bootable disk, and reboots the server from it automatically.
5

Complete the installation via VNC

After the server reboots, connect via VNC to reach the installer. The ISO boot menu appears in the console. Follow the installer steps to complete the OS installation.
After the installation is complete, disconnect the ISO image to restore normal boot: open Virtual disk in the left sidebar, disconnect the mounted ISO image, and restart the server.