Use CLI to add SSH key pair to OpenStack

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Use cli to add ssh key pair to Openstack: In this series of Openstack configuration and management, let us look at how to add ssh key pair to Openstack. This guide is based on the Openstack Ocata version.

The public/private key pair works by keeping the public key on the server and the private key on the local workstation. Once the server confirms that the two keys match, a secure connection can be established.

So, let’s generate a new ssh key pair, if there is already a pair, you can skip this pair:

$ ssh-keygen -t rsa -b 4096
Generating public/private rsa key pair.
Enter file in which to save the key (/home/josphat/.ssh/id_rsa): 
Created directory '/home/josphat/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/josphat/.ssh/id_rsa.
Your public key has been saved in /home/josphat/.ssh/id_rsa.pub.
The key fingerprint is:
28:14:e0:14:11:0d:77:23:2d:6c:65:12:4e:26:a1:de [email protected]
The key's randomart image is:
+--[ RSA 4096]----+
| XXO+= |
| + *=*.. |
|. ..o. |
|. .. . |
| . E. . S |
| . |
| |
| |
| |
+-----------------+

Copy the key to the clipboard:

xclip -sel clip < ~/.ssh/id_rsa.pub

Then log in to your Openstack controller node and save the key to a file:

vim josphat.pub

Paste the key content into the file and save it.

The next step is to import the key using the openstack keypair command:

# openstack keypair create --public-key josphat.pub josphat
+-------------+-------------------------------------------------+
| Field       | Value                                           |
+-------------+-------------------------------------------------+
| fingerprint | 19:7b:5c:14:a2:21:7a:a3:dd:56:c6:e4:3a:22:e8:3f |
| name        | josphat                                         |
| user_id     | 93f0f5c4197f4f73b01bfe8086ecbec0                |
+-------------+-------------------------------------------------+

At last”Joseph“Is the name of the key pair seen on the Openstack command CLI and Horizon dashboard.

confirm:

# openstack keypair list
+---------------+-------------------------------------------------+
| Name          | Fingerprint                                     |
+---------------+-------------------------------------------------+
| jmutai_pubkey | 19:7b:5c:14:a2:21:7a:a3:dd:56:c6:e4:3a:22:e8:3f |
| josphat       | 19:7b:5c:14:a2:21:7a:a3:dd:56:c6:e4:3a:22:e8:3f |
+---------------+-------------------------------------------------+

The same content can be confirmed on the Horizon dashboard by the following methods: Project>Key Pair:

OpenStack can inject the public ssh key into the instance at startup so that it can be accessed with the private key once it is ready. Go ahead and create a new VM, and upload the key pair:

openstack server create --flavor m1.tiny --image CoreOS-x86_64 
 --nic net-id=a54af9d4-d297-45b6-a98c-79d84add5f2e --security-group default 
 --key-name josphat coreos-test-vm

If you haven’t uploaded any images, I have provided detailed instructions on how to add images to Openstack, please check on the link below:

Add images to Openstack Glance

You can use the following methods to obtain the network ID, image name (ID) and security group:

# openstack image list
# openstack network list
# openstack security group list

Use CLI to add SSH key pair to OpenStack

Check whether the created instance is running and obtain its IP address:

openstack server list

Verify access rights:

$ ping -c 4 ip_address

You can now log in to the virtual machine in the following ways:

ssh [email protected]_address

Since I am using a CoreOS image, the default username is core

[email protected] ~ $ cat /etc/os-release 
NAME="Container Linux by CoreOS"
ID=coreos
VERSION=1409.8.0
VERSION_ID=1409.8.0
BUILD_ID=2017-08-10-0112
PRETTY_NAME="Container Linux by CoreOS 1409.8.0 (Ladybug)"
ANSI_COLOR="38;5;75"
HOME_URL="https://coreos.com/"
BUG_REPORT_URL="https://issues.coreos.com"
COREOS_BOARD="amd64-usr"

that’s it. More tutorials related to Openstack will be released soon. Follow us on Twitter for updates.

More articles:

How to add flavor to OpenStack using CLI

You can download this article in PDF format via the link below to support us.Download the guide in PDF formatClose

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