OPS345 Lab 1
THIS PAGE IS A DRAFT, NOT A REAL COURSE PAGE
The current schedule for OPS345 is here: OPS335_Weekly_Schedule
Log in here: https://awsacademy.instructure.com
Click "Courses" > "AWS Academy Learner Lab - Foundation Services" > "Modules" > "Learner Lab - Foundational Services"
Click "Start Lab". The first time this will take a few minutes. This will spin up all your EC2 instances which automatically shut down 4 hours after you start the lab. But your data will not be lost. Your VMs will persist until the end of the course.
AWS cost monitoring
- You are responsible for your AWS usage. Normally using resources from AWS costs money. In an AWS Educate Learner Lab you get a 100$ credit which will be more than enough to cover all your resources until the end of the course.
- Take this opportunity during the course to learn what costs how much money, and make sure you don't use up your 100$ until you are done all your work in the course. The skills of managing cloud costs are very valuable.
- Both in the Learner Lab and the real AWS figuring out what the money was spent on is surprisingly difficult after it's already spent. So pay attention whenever you see a note about the cost of anything.
- You cannot use AWS Budgets in your AWS Learning Lab.
- You could try to figure out how to use the Amazon CloudWatch billing alarms
- Always keep cost in the back of your mind when doing /anything/ on AWS
Basic security on a public-facing server
- A good AWS password, not used anywhere else
- Remove default usernames
- Whenever possible: don't use passwords at all, use SSH keys for logging in
- root is never allowed to log in remotely
- How to use sudo and how to configure it
- ssh keys, same as OPS245
- How to organise your SSH keys and not lose them
First AWS VM
- Create a new security group "ops345first" with only the SSH port open. We'll look at security groups in more detail next week.
- Instance == VM. AMI == VM disk image.
- Lots of AMIs appear to be available, only Amazon Linux works with AWS Academy.
- Use "Launch Instances" to deploy a pre-built "Amazon Linux 2 AMI (HVM), SSD Volume Type" VM. Not one of the other Amazon Linux AMIs.
- Instance type t2.micro - sort of kind of almost free
- Security group "ops345first"
- Create a new RSA key pair named ops345-first-key, save it as ops345-first-key.pem on your workstation under a new directory ~/keys/ssh/
- Differences between Amazon Linux and CentOS
- Not linked to RedHat/IBM support cycles and policies.
- Explore the VM:
- connect with user ec2-user, ssh key
- Many packages not installed by default in CentOS /are/ installed by default in Amazon Linux.
- yum install telnet
- systemctl works the same way
- Note neither iptables nor any other firewall is installed by default.
- passwd, shadow, group files
- netstat -atnup
- Create yoursenecaid user, no password, create /etc/sudoers.d/10-ops345-users with these contents:
yoursenecaid ALL=(ALL) NOPASSWD:ALL
- Allow yourself to log in using your SSH key:
# cd /home/ec2-user/ # cp -r .ssh/ ~yoursenecaid # chown -R yoursenecaid.users ~yoursenecaid/.ssh/
- Confirm ssh in as yoursenecaid and successfully sudo su -
- Delete ec2-user including the home directory. Use the userdel command.
- Update hostname to "first.yoursenecaid.ops" and make sure it sticks:
- Change the instance "Name" in the EC2 management console to "first".