CSC Cloud — Using CSC Cloud

Creating and Configuring VMs

1. Configuring SSH Keys

We can create SSH keys in the web interface by navigating to Compute, then Key Pairs and selecting Create Key Pair. Next, give the key pair name denoted by the variable KEY_NAME and save the downloaded $KEY_NAME.pem file to your home directory. Then, on the command line, move to the home directory, create .ssh directory with read, write and execute privileges for the user if it doesn’t exist, and move your key file into it.

mkdir -p ~/.ssh
chmod 700 ~/.ssh

mv $KEY_NAME.pem ~/.ssh

Next, protect the key with a password.

ssh-keygen -p -f ~/.ssh/$KEY_NAME.pem

Then, change the key to read-only.

chmod 400 ~/.ssh/$KEY_NAME.pem

2. Creating a Virtual Machine

We will use a virtual machine with the Ubuntu 20.04 operating system. We can launch a virtual machine by navigating to Compute, then Instances, and select Launch Instance. Set the following parameters:

• In the Details tab:
  • Availability Zone: nova
  • Instance Name: genie
  • Flavor: standard.tiny
  • Number of Instances: 1
  • Instance Boot Source: Boot from image
  • Image Name: Ubuntu-20.04
• In Access & Security tab:
  • Key Pair: $KEY_NAME
  • Security Groups: default

Finally, press Launch.

3. Configuring Security Groups

We can manage internet access to our virtual machine by defining security groups and associating them with the virtual machine. We can set up firewalls and security groups by navigating to Network, then Security Groups.

Creating SSH Group

Let’s create a new security group by selecting Create Security Group and name it SSH. Then, select Manage Rules for the group and Add Rule with the following parameters:

• Rule: Custom TCP Rule
• Direction: Ingress
• Open Port: Port
• Port: 22 (Default port for SSH connections.)
• Remote: CIDR
• CIDR: <ip-address>/32

Substitute <ip-address> with your IP address which you can find out from ifconfig.me. The number after the slash / is the CIDR Prefix. You can learn more about the CIDR subnet mask notation from the Netgate documentation.

Creating HTTP Group

Next, let’s create a security group named HTTP and add a rule with parameters.

• Rule: Custom TCP Rule
• Direction: Ingress
• Open Port: Port
• Port: 80 (Default port for HTTP connections.)
• Remote: CIDR
• CIDR: 0.0.0.0/0

Creating HTTPS Group

Finally, let’s create HTTPS security group and add the rule with parameters:

• Rule: Custom TCP Rule
• Direction: Ingress
• Open Port: Port
• Port: 443 (Default port for HTTPS connections.)
• Remote: CIDR
• CIDR: 0.0.0.0/0

Adding Groups to Virtual Machine

We can add security groups to a virtual machine by navigating to the Compute menu, then Instances, and in selecting Edit Security Groups from the menu next to Create Snapshot. We should add the SSH, HTTP, and HTTPS groups to our virtual machine. By including the SSH security group, we can connect to our virtual machine via SSH. Furthermore, by including HTTP and HTTPS security groups, we allow traffic from the internet to the web server and application deployed on the virtual machine.

4. Configuring a Floating IP

Associating the virtual machine with a floating IP, that is, a public IP, allows users to connect to it with the methods we have set on the security groups. To create and associate a public IP, navigate to the menu next to Create Snapshot and select Associate Floating IP. Then, on the IP Address field, click the plus sign to allocate a new floating IP. Once allocated, select the created floating IP and press Associate. We denote the value of the floating IP as FLOATING_IP.

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