A Technical I.T./DevOps Blog
Problem scenario
You try to run an aws ssm command. But you get an error about a connection timing out. What should you do?
Solution
Find the EC-2 server’s VPC and subnet. Go to VPC in the AWS console. Go to the Subnet section. Find the Route Table associated with the subnet for the EC-2 server. Make sure that the “Destination” field accommodates the IP address of the ssm.us-west1.amazonaws.com hostname.
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Problem scenario
In AWS you find some components, such as a Security Group, has an owner. You cannot find the owner in IAM. How do you learn more about this user?
Solution
The owner is not an IAM user. In the AWS Console, go to Support -Support Center. Search for the owner number there. You may have different account aliases.
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Continue reading “How Do You Find the Owner of an AWS Resource?”
Problem scenario
You have a VPC. You want a NACL to protect your VPC from hackers and other networks. What do you do?
Solution
Network ACLs are created by default when you create a VPC. They can be configured the same way Security Groups are configured in the AWS Console. Go to the VPC Dashboard -Security -Network ACLs. Click on the relevant Network ACL.
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Problem scenario
In AWS Systems Manager you run an “aws ssm” command. You get “An error occurred (InvalidInstanceId) when calling the Send Command operation.” What should you do?
Solution
Are there spaces or braces inside the double quotes? These symbols are not part of the instance ID. If you are running a script or complex command, extraneous symbols may be getting injected into your instance ID.
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Problem scenario
You want to use the latest (as of 2020) Python SDK to interact with AWS. What do you do?
Prerequisite
Install pip. See this posting.
Solution
Run these commands:
sudo pip3 install boto3
sudo pip3 install –upgrade pip
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Continue reading “How Do You Install Boto3 on Ubuntu/Debian Linux?”
Problem scenario
You have been given a URL endpoint that is supported by some AWS service or services. How do you find out what the underlying service is?
Solution
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Continue reading “How Do You Find the Underlying Component in AWS for a Given URL Endpoint?”
Problem scenario
You have a playbook, and your variables are defined. But you get an error “FAILED ={‘msg”: ‘The task includes an option with an undefined variable. The error was ‘dict object’ has no attribute ‘Name’…”
What do you do to solve this?
Solution
The variable’s source could be blank. With “ec2_instance_info” the module will connect to AWS.
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Problem scenario
For a boto3 program, you want to find the AWS namespaces. What do you do to list the namespaces that are part of your AWS accounts?
Solution
Prerequisites
You must have the AWS CLI installed. If you need assistance with this, see this posting.
This also assumes that the Linux user has the policy for servicediscovery:ListNamespaces.
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Problem scenario
You want to create an AWS S3 bucket using the AWS CLI. What do you do?
Solution
Prerequisite
This assumes that you have installed the AWS CLI. If you need assistance, see this posting.
Procedures
Run a command like this but replace “foobar” with the unique name of an s3 bucket that other people will see.
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Continue reading “How Do You Create an AWS S3 Bucket via the AWS CLI?”
Problem scenario
You used a .json file and the AWS CLI to configure customized metrics. When you go to the GUI you do not see the graphs. The commands that were run with the .json file completed without errors or problems. How do you get the web console to show the metrics you configured for various AWS components?
Possible Solution #1
CloudWatch metrics are not all necessarily graphed.
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Continue reading “What Do You Do If CloudWatch Metrics Are Not Showing Up in the Dashboard?”