I have successfully provisioned Bare Metal Cloud compute instances using the following code:
public static Instance createInstance(
ComputeClient computeClient,
String compartmentId,
AvailabilityDomain availabilityDomain,
String instanceName,
Image image,
Shape shape,
Subnet subnet
) {
LaunchInstanceResponse response = computeClient.launchInstance(
LaunchInstanceRequest.builder()
.launchInstanceDetails(
LaunchInstanceDetails.builder()
.availabilityDomain(availabilityDomain.getName())
.compartmentId(compartmentId)
.displayName(instanceName)
.imageId(image.getId())
.shape(shape.getShape())
.subnetId(subnet.getId())
.build())
.build());
return response.getInstance();
}
However, I can't SSH into any instances I create via the code above, because there's no parameter on launchInstance
to pass in the public key of my SSH keypair.
How can I tell the instance what SSH public key to allow? I know it must be possible somehow since the console UI allows me to provide the SSH public key as part of instance creation.
According to the launch instance API documentation, you need to pass your SSH public key via the ssh_authorized_keys
field of the metadata
parameter:
Providing Cloud-Init Metadata
You can use the following metadata key names to provide information to Cloud-Init:
"ssh_authorized_keys" - Provide one or more public SSH keys to be included in the ~/.ssh/authorized_keys file for the default user on the instance. Use a newline character to separate multiple keys. The SSH keys must be in the format necessary for the authorized_keys file
The code for this in the Java SDK looks like this:
public static Instance createInstance(
ComputeClient computeClient,
String compartmentId,
AvailabilityDomain availabilityDomain,
String instanceName,
Image image,
Shape shape,
Subnet subnet
) {
String sshPublicKey = "ssh-rsa AAAAB3NzaC1y...key shortened for example...fdK/ABqxgH7sy3AWgBjfj some description";
Map<String, String> metadata = new HashMap<>();
metadata.put("ssh_authorized_keys", sshPublicKey);
LaunchInstanceResponse response = computeClient.launchInstance(
LaunchInstanceRequest.builder()
.launchInstanceDetails(
LaunchInstanceDetails.builder()
.availabilityDomain(availabilityDomain.getName())
.compartmentId(compartmentId)
.displayName(instanceName)
.imageId(image.getId())
.metadata(metadata)
.shape(shape.getShape())
.subnetId(subnet.getId())
.build())
.build());
return response.getInstance();
}
Then the instance will allow you to SSH to it using the SSH keypair for that public key.