EC2 Flashcards
How to connect to EC2 instances in private subnet ?
Configure a bastion host in the public subnet and ssh into it. Then ssh to the backend instance from the bastion
How to create Instances with software pre-installed ? (2)
. Add the script for the installation in the User data section
. Create an AMI and then create a launch configuration
How to secure the data in EBS volume ?
encrypt the data using KMS
Type of EBS ?
. Low latency
. Development and test environments
. Balance of price and performance.
General purpose SSD
Type of EBS ? High performance for mission critical Low latency Sustained IOPS performance More than 64 000 IOPS
Provisioned IOPS SSD
Type of EBS ? . Big data, data warehouses, log processing . Low-cost . Frequently accessed . Throughput intensite workloads
throughput optimized HDD
Type of EBS ?
. Lowest cost
. Designed for less frequently accessed workloads
Cold HDD
Type of EC2 instance ?
. Development/testing cases where you are not certain about the best EC2 instance to use for an application
. cannot be interrupted, short-term use, highly variable, or unpredictable
On demand
Type of EC2 instance ?
. Application that is tolerant of potential interruption/failure,
. Using those instances has the potential for providing substantial cost savings (up to 90% than others)
. Useful to scale up an application that suddenly needs a great deal more compute capacity
Spot instance
Type of EC2 instance ?
. Reduce costs by making 1 or 3 year commitment to a consistent amount of usage (don’t support RDS)
. Used if you know your applications’ workload profiles
savings plans
. Reduce costs by making 1 or 3 year commitment to a consistent amount of usage (don’t support RDS)
. Used if you know your applications’ workload profiles
. Assigned to a specific AZ
Reserved instance
Instance metadata vs user data ?
Instance metadata is data use to configure or manage the running instance. for example, host name, events, and security groups.
User Data specified by the user, for example, you added a new bucked, its unique bucked name will be part of user data.
Random High rate read and writes
Works with SQL & NoSQL
“intensive read/write and consistent” for IO
Provisioned IOPS SSD
the most cost-effective EBS storage option
Throughput Optimized HDD
Storing of settings such as AMI ID, instance type, key pairs and Security Groups
EC2 launch template
What is the default limit of EC2 per region ?
20 instances
Where are stored Ip addresses, instance ID, public keys and network interfaces for EC2 ?
store in the metadata of EC2 instance
small and random I/O operations, SSD or HDD ?
SSD
SSD vs HDD, which is the cheapest ?
HDD
Best for transactional workloads , SSD or HDD ?
SSD
Can be used as a bootable volume, SSD or HDD ?
SSD
How to remotely and securely manage the configuration of your managed instances ?
Systems Manager Run Command
