(instances-create)=
# How to create instances

To create an instance, you can use either the [`incus init`](incus_create.md) or the [`incus launch`](incus_launch.md) command.
The [`incus init`](incus_create.md) command only creates the instance, while the [`incus launch`](incus_launch.md) command creates and starts it.

## Usage

Enter the following command to create a container:

    incus launch|init <image_server>:<image_name> <instance_name> [flags]

Image
: Images contain a basic operating system (for example, a Linux distribution) and some Incus-related information.
  Images for various operating systems are available on the built-in remote image servers.
  See {ref}`images` for more information.

  Unless the image is available locally, you must specify the name of the image server and the name of the image (for example, `images:debian/12` for a Debian 12 image).

Instance name
: Instance names must be unique within an Incus deployment (also within a cluster).
  See {ref}`instance-properties` for additional requirements.

Flags
: See [`incus launch --help`](incus_launch.md) or [`incus init --help`](incus_create.md) for a full list of flags.
  The most common flags are:

  - `--config` to specify a configuration option for the new instance
  - `--device` to override {ref}`device options <devices>` for a device provided through a profile, or to specify an {ref}`initial configuration for the root disk device <devices-disk-initial-config>`
  - `--profile` to specify a {ref}`profile <profiles>` to use for the new instance
  - `--network` or `--storage` to make the new instance use a specific network or storage pool
  - `--target` to create the instance on a specific cluster member
  - `--vm` to create a virtual machine instead of a container

## Pass a configuration file

Instead of specifying the instance configuration as flags, you can pass it to the command as a YAML file.

For example, to launch a container with the configuration from `config.yaml`, enter the following command:

    incus launch images:debian/12 debian-config < config.yaml

```{tip}
Check the contents of an existing instance configuration ([`incus config show <instance_name> --expanded`](incus_config_show.md)) to see the required syntax of the YAML file.
```

## Examples

The following examples use [`incus launch`](incus_launch.md), but you can use [`incus init`](incus_create.md) in the same way.

### Launch a system container

To launch a system container with a Debian 12 image from the `images` server using the instance name `debian-container`, enter the following command:

    incus launch images:debian/12 debian-container

### Launch an application container

To launch an application (OCI) container, you first need to add an image registry:

    incus remote add oci-docker https://docker.io --protocol=oci

And then can launch a container from one of its images:

    incus launch oci-docker:hello-world --ephemeral --console

### Launch a virtual machine

To launch a virtual machine with a Debian 12 image from the `images` server using the instance name `debian-vm`, enter the following command:

    incus launch images:debian/12 debian-vm --vm

Or with a bigger disk:

    incus launch images:debian/12 debian-vm-big --vm --device root,size=30GiB

### Launch a container with specific configuration options

To launch a container and limit its resources to one vCPU and 192 MiB of RAM, enter the following command:

    incus launch images:debian/12 debian-limited --config limits.cpu=1 --config limits.memory=192MiB

### Launch a VM on a specific cluster member

To launch a virtual machine on the cluster member `server2`, enter the following command:

    incus launch images:debian/12 debian-container --vm --target server2

### Launch a container with a specific instance type

Incus supports simple instance types for clouds.
Those are represented as a string that can be passed at instance creation time.

The syntax allows the three following forms:

- `<instance type>`
- `<cloud>:<instance type>`
- `c<CPU>-m<RAM in GiB>`

For example, the following three instance types are equivalent:

- `t2.micro`
- `aws:t2.micro`
- `c1-m1`

To launch a container with this instance type, enter the following command:

    incus launch images:debian/12 my-instance --type t2.micro

The list of supported clouds and instance types can be found at [`https://github.com/dustinkirkland/instance-type`](https://github.com/dustinkirkland/instance-type).

### Launch a VM that boots from an ISO

```{note}
When creating a Windows virtual machine, make sure to set the `image.os` property to something starting with `Windows`.
Doing so will tell Incus to expect Windows to be running inside of the virtual machine and to tweak behavior accordingly.

This notably will cause:
 - Some unsupported virtual devices to be disabled
 - The {abbr}`RTC (Real Time Clock)` clock to be based on system local time rather than UTC
 - IOMMU handling to switch to an Intel IOMMU controller
```

To launch a VM that boots from an ISO, you must first create a VM.
Let's assume that we want to create a VM and install it from the ISO image.
In this scenario, use the following command to create an empty VM:

    incus init iso-vm --empty --vm

```{note}
Depending on the needs of the operating system being installed, you may want to allocate more CPU, memory or storage to the virtual machine.

For example, for 2 CPUs, 4 GiB of memory and 50 GiB of storage, you can do:

    incus init iso-vm --empty --vm -c limits.cpu=2 -c limits.memory=4GiB -d root,size=50GiB
```

The second step is to import an ISO image that can later be attached to the VM as a storage volume:

    incus storage volume import <pool> <path-to-image.iso> iso-volume --type=iso

Lastly, you need to attach the custom ISO volume to the VM using the following command:

    incus config device add iso-vm iso-volume disk pool=<pool> source=iso-volume boot.priority=10

The `boot.priority` configuration key ensures that the VM will boot from the ISO first.
Start the VM and connect to the console as there might be a menu you need to interact with:

    incus start iso-vm --console

Once you're done in the serial console, you need to disconnect from the console using `ctrl+a-q`, and connect to the VGA console using the following command:

    incus console iso-vm --type=vga

You should now see the installer. After the installation is done, you need to detach the custom ISO volume:

    incus storage volume detach <pool> iso-volume iso-vm

Now the VM can be rebooted, and it will boot from disk.

### Install the Incus Agent into virtual machine instances

In order for features like direct command execution (`incus exec`), file transfers (`incus file`) and detailed usage metrics (`incus info`)
to work properly with virtual machines, an agent software is provided by Incus.

The virtual machine images from the [images](https://images.linuxcontainers.org) remote are pre-configured to load that agent on startup.

For other virtual machines, you may want to manually install the agent.

```{note}
The Incus Agent is currently available only on Linux virtual machines.
```

Incus provides the agent through a remote `9p` file system with mount name `config`.
To install the agent, you'll need to get access to the virtual machine and run the following commands:

    mount -t 9p config /mnt
    cd /mnt
    ./install.sh

The first line will mount the remote file system on the mount point `/mnt`.
The subsequent commands will run the installation script `install.sh` to install and run the Incus Agent.
You need to perform this task once.
