Virtualized file server rolling upgrade

One or more computer-readable non-transitory storage media, the media encoded with instructions for performing operations comprising:

• receiving a request to upgrade a virtualized file server, the virtualized file server comprising a plurality of user virtual machines (VMs) configured to provide file services to additional virtual machines hosted by one or more host machines, from a first program code version to a second program code version;
• generating a snapshot of a code image associated with the second program code version;
• providing the snapshot to a selected user VM of the multiple user VMs when the selected user VM has acquired an upgrade token, the upgrade token configuration for association with a single one of the user VMs at a time;
• detaching an existing code image from the selected user VM, wherein the user VM is located on a host machine;
• attaching the snapshot to the selected user VM;
• and
• causing the selected user VM to boot from the snapshot.

A method comprising:

• receiving a request to upgrade a virtualized file server, the virtualized file server comprising a plurality of user virtual machines (VMs) configured to provide file services to additional virtual machines hosted by one or more host machines, from a first program code version to a second program code version;
• generating a snapshot of a code image associated with the second program code version;
• and
• providing the snapshot to a selected user VM of the plurality of user VMs when the selected user VM has acquired an upgrade token, the upgrade token configuration for association with a single one of the user VM at a time;
• detaching an existing code image from the selected user VM, wherein the selected user VM is located on a host machine;
• and
• attaching the snapshot to the selected user VM;
• and
• causing the selected user VM to boot from the snapshot.

A system comprising:

• a virtualized file server (VFS) comprising a plurality of user virtual machines (VMs), the VFS configured to provide file services to additional virtual machines hosted by one or more host machines;
• a deployment server configured to upgrade one or more user VMs of the VFS from a first code version to a second code version by performing actions comprising:
• generating a snapshot of a code image associated with the second program code version;
• providing the snapshot to a selected user VM of the one or more user VMs when the selected user VM has acquired an upgrade token, the upgrade token configured for association with a single one of the user VMs at a time,
• wherein during at least a portion of detaching an existing code image from the selected user VM located on a host machine and attaching the snapshot to the selected user VM, a storage device and IP address of the host machine are replaced by a storage device and IP address of another host machine.

A method comprising:

• receiving a request to upgrade a virtualized file server (VFS) comprising a plurality of user virtual machines (VMs), the VFS configured to provide file services to additional virtual machines hosted by one or more host machines, from a first program code version to a second program code version;
• generating a snapshot of a code image associated with the second program code version;
• and
• providing the snapshot to a selected user VM of the multiple user VMs when the selected user VM has acquired an upgrade token, the upgrade token configuration for association with a single one of the user VM at a time;
• wherein during at least a portion of detaching an existing code image and attaching the snapshot to the selected user VM on a host machine, a storage device and IP address of the host machine are replaced by a storage device and IP address of another host machine.