guide.en-sg.md

title	excerpt	updated
Creating an Instance via the Horizon interface	Find out how to create an Instance via the Horizon interface	2024-08-27

Objective

You can create multiple Instances directly in the Horizon interface, and also configure a security group to apply to your Instances.

Find out how to create an Instance via the Horizon interface.

Requirements

• A Public Cloud project in your OVHcloud account
• Access to the Horizon interface

Instructions

Create a private network

As a general rule, we recommend creating a private network before creating an instance. You can later attach this network to your instance.

To begin, log in to the Horizon interface. If you are unsure about how to do this, please refer to our guide.

Next, click on Network{.action} in the left-hand menu, then Networks{.action}.

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Click on Create Network{.action}

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[!tabs]

1. Network

Network Name: Enter a name for your network.
Enable Admin State: Leave this option checked to activate the network.
Create Subnet: Leave this option checked to create the subnet.
Availability Zone Hints: Leave the default option.

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2. Subnet

Subnet Name: Enter a name for your subnet.
Network Address: Choose a private network range. For example: 192.168.0.0/24.
IP Version: Leave this value at IPv4.
Gateway IP: This is optional. If it is not defined, a Gateway IP is automatically selected.
Disable Gateway: Leave this unchecked.

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3. Subnet Details

Enable DHCP: Leave this option checked.
Allocation Pools: Optional. You can specify the range from which IPs are selected.
DNS Name Servers: Optional. You can specify any DNS name servers.
Host Routes: Optional. You can specify any host routes.

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Create Instance

In the Horizon interface, click on Compute{.action} in the left-hand menu, then Instances{.action}.

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The page that opens can be used to view the Instances that are currently launched. To launch a new one, click the Launch Instance{.action} button.

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You will then need to fill in the information requested. Please note that this grid is not exhaustive.

Details

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Information	Details
Instance name	Specify the name you want for the Instance that will be launched.
Description	This is Optional. Set a description if applicable.
Availability zone	Leave "nova" (default choice).
Count	Specify the number of Instances to launch.

Source

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Information	Details
Select Boot Source	Click on the drop-down arrow to select the source for launching an instance (e.g. "Image" or "Instance snapshot").
Create New Volume	You may choose to check this option if you wish to create a volume into which the specified operating system image is copied.
Volume size (GB)	If you have chosen to create a volume, allow the system to determine the size for you.
Delete Volume on Instance Delete	You can leave the default option No. If Yes is selected, when the instance is deleted, so is the volume.
Image name (only when launching from an image)	Select the Instance image by clicking on the upward arrow next to the image of your choice. In our example, we use selected Centos 7.
Instance snapshot (only for launching from a snapshot)	Choose an Instance snapshot by clicking on the upward arrow next to the instance snapshot image of your choice.

Flavor

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Pre-built flavors are available for you, select the flavor of your choice underneath the Available tab.

Networks

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Information	Details
Network	Select the network(s) for the Instance you want to create, from the list of available networks.
Ext-Net	Represents the Public Network.
Mynewnetwork	Represents the Private network created at the beginning of this guide.

Security Groups

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For more information, consult this guide.

Key Pair

Warning

Although the "Key Pair" field is not mandatory in the Horizon interface when creating an instance, registering an SSH key is absolutely necessary to be able to connect to an instance. Without an SSH key, you will be required to reboot the instance in rescue mode to either create a password or add an SSH key to the appropriate file (for more information, please refer to the guide on Replacing your lost SSH key pair).

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In this section, you have the option to create a keypair, import a keypair or use an existing key pair.

For more information on how to create an SSH key, consult this guide.

[!tabs] + Create Key Pair

To create a Keypair, click on the + Create Key Pair{.action} button. Please note that with this option, additional steps have to be made before you are able to connect to the instance, especially if you are using the software PuTTY to connect to your instance. See this section of the corresponding guide.

Key Pair Name: Enter a name for your key.
Key Type:* Click on the drop down arrow{.action} and select SSH Key{.action}.
Next, click on Create Keypair{.action} to begin the creation of the key pair.

Once the Key Pair is created, click on Copy Private Key to Clipboard{.action}, then on Done{.action}.

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Once done, the newly created key will be automatically selected. Click on Launch Instance{.action} to begin the creation of your instance.

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Import Key Pair

If you prefer to import a previously created SSH key, click on the Import Key Pair{.action} button.

Key Pair Name: Enter a name for your key.
Key Type:* Click on the drop down arrow{.action} and select SSH Key{.action}.
Load Public Key from a file: Click on Browse{.action} to specify the location of the public key on your computer.
Public Key: Copy and paste your public key here.
Click on Import Key Pair{.action} to import the key.

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Once done, the imported key will be automatically selected. Click on Launch Instance{.action} to begin the creation of your instance.

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Other options

Please note that these options are not mandatory for the creation of a basic instance. If you wish to explore these options further, consult the official OpenStack documentation.

Information	Details
Custom script source	Specify the source between a "direct entry" or a "file".
Script data	Enter the script code in the input field (16KB maximum).
Script file	Click Browse{.action} to select the post-installation script.
Disk partitioning	Choose between "automatic" or "manual".
Configuration disk	Configure OpenStack to write metadata on to a specific configuration disk that will be attached to the Instance when it is launched.

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