How Do You Troubleshoot a Computer That Will Not Boot to a USB Drive?

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Problem scenario
You have a thumb drive with an .iso on it. You want to boot to it to install a hard drive. When you turn your desktop/laptop/PC on, you get “BootDevice Not Found Please Install an operating system on your hard disk. Hard Disk (3F0).” Or you get an error like this “disk error press any key to restart.”

Solution
The USB drive may not be configured to be bootable.

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How Do You Troubleshoot the Boto3 Error “AttributeError: ‘ec2.ServiceResource’ object has no attribute ‘terminate_instances'”?

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Problem scenario
You are trying to terminate some EC-2 instances. But you see a message like this:

“AttributeError: ‘ec2.ServiceResource’ object has no attribute ‘terminate_instances'”
“AttributeError: ‘ec2.ServiceResource’ object has no attribute ‘destroy_instances'”
“AttributeError: ‘ec2.ServiceResource’ object has no attribute ‘delete_instances'”

What should you do?

Solution
Rewrite the terminate portion to look like this:

ec2.instances.filter(InstanceIds=[’i-0abcd1234′, ‘i-0wxyz9999’]).terminate() …

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How Do You Use Boto and CloudFormation to Delete a Stack?

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Problem scenario
You want to delete a CloudFormation Stack with Boto. What do you do?

Solution
Run a program like this (but replace “continualstack” with the name of the stack you deployed):

import boto3
cloudf = boto3.client(‘cloudformation’, region_name=’us-west-1′, aws_access_key_id=’AKIAMNOPQRST’, aws_secret_access_key=’FOOBAR1234/ZYXWV987654′)
json_stack=open(‘lampstack.json’, ‘r’).read()
cloudf.delete_stack(StackName=’continualstack’) …

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How Do You Eliminate Old Email Settings in Mozilla Thunderbird on Windows?

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Problem scenario
You keep opening Mozilla Thunderbird in Windows, and it keeps finding the old settings. You want a fresh installation. What should you do?

Solution
Overview: Totally remove Thunderbird and reinstall it.

Procedure

  1. Close Thunderbird
  2. Install CCleaner. It can be downloaded from here: https://www.ccleaner.com/ccleaner/download. (The free version will work.)
  3. Open it.

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How Do You Troubleshoot the Python Errors “NameError: name ‘copy’ is not defined” or “object has no attribute ‘copy'”?

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Problem scenario
You are running a Python program. But you get “NameError: name ‘copy’ is not defined” or “object has no attribute ‘copy'”. What should you do?

Solution
Use “import copy” at the top of the program.

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How Do You Troubleshoot the Hadoop Error “ApplicationClientProtocolPBClientImpl.getApplicationReport”?

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Problem scenario
You are running a Hadoop command, but you get this message:

java.net.ConnectException: Your endpoint configuration is wrong; For more details see: http://wiki.apache.org/hadoop/UnsetHostnameOrPort, while invoking ApplicationClientProtocolPBClientImpl.getApplicationReport over null after 3 failover attempts. Trying to failover after sleeping for 22088ms.
2020-12-20 18:54:36,679 INFO ipc.Client:

What should you do?

Possible Solution
Is Resource Manager running? Start a new terminal and run “jps” to find out.

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How Do You Determine the GitHub Enterprise URL for the API Endpoint?

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Problem scenario
You want to run some curl commands to invoke a GitHub Enterprise URL. You tried using “https://api.github.foobar.com/…”, but you get a message about the URL not resolving. How can you find out what the API endpoint is?

Possible Solution
Try “https://github.foobar.com/api/v3/…” instead. Although Github.com uses the “api” immediately after the “https://” constructor (and to the left of the “github…” section), your GitHub Enterprise instance may use “http(s)://[hostname]/api/v3” (with the “api” to the right of the hostname in the URL constructor).

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