How Do You Troubleshoot the Python Error “NameError: name ” is not defined”?

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Problem scenario
You are trying to run a Python program with a class. You get this message:

File “foobar.py”, line 11, in
class Building(param1, param2):
NameError: name ‘param1’ is not defined

What should you do?

Solution
Use the word “object” instead of one or more parameters that you are passing in the parentheses () of the class.

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How Do You Use Ansible to Have Retrievable Double Quotes ‘”‘ in a Variable?

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Problem scenario
You are using Ansible, and you want a playbook to have a variable with double quotes. The double quotes are disappearing from your echo var1.stdout[:] invocations. How do you get shell/bash commands to have double quotes?

Solution
Rather than “echo” a string with double quotes, use a variable assignment. Do not use this: echo “a \”long string\” for a \”test\” “

Use something like this: coolstring=”a \”long string\” for a \”test\” ” &&

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How Do You Troubleshoot the Presto Error “‘PK\003\004’: command not found”?

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Problem scenario
You try to start Presto from a command line interface. But you get an error message with garbled output like this:

./presto: line 1: $’PK\003\004′: command not found
./presto: line 2: $’ܢ\327H’: command not found
./presto: line 3: syntax error near unexpected token `)’
./presto: line 3: ۢ▒H▒▒W▒META-INF/MANIFEST.MF▒P▒j!▒▒▒?▒8▒▒ɸK)’

Possible solution #1
You may have downloaded a .jar file that could be unpacked.

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How Do You Troubleshoot an Error Trying to Delete a VPC, Network Interface, or Subnet ID?

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One (or more) of the following problems is applicable:

Problem scenario #1
You are trying to delete an network interface in AWS. But you get an error “You are not allowed to manage ‘ela-attach’ attachments.” What should you do?

Problem scenario #2
You are trying to delete a subnet from AWS’ VPC. But you get this error:

Note that the following subnets cannot be deleted: The following subnets contain one or more network interfaces, …

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How Do You Troubleshoot the Message “/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:83:in `require’: cannot load such file — foobar (LoadError)”?

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Problem scenario
You are running Vagrant, Ruby or a Ruby application, but you get this error: “/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:83:in `require’: cannot load such file — foobar (LoadError)”

What should you do?

Possible Solution #1
Try to run the original command with “sudo”. If that doesn’t work, use “gem list” to verify “foobar” is installed.

For Windows users, try to run the command or application as Administrator.

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How Can You Use CloudTrail for the First Time in Your AWS Account?

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Problem scenario
You want to log or monitor AWS activity (e.g., AWS Management Console, AWS CLI, and/or AWS SDK actions). You do not want encryption because you are just testing it out. How do you use CloudTrail to do this?

Solution

  1. Log into AWS.
  2. Go to this link: https://console.aws.amazon.com/cloudtrail/
  3. Click “Create a trail”
  4. Enter a descriptive name for your trail.

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How Do You Fix the Stack Storm Error “Failed to authenticate”?

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Problem scenario
You run an st2 command, but it fails with an error like this:

Failed to authenticate with credentials provided in the config.
ERROR: 401 Client Error: Unauthorized
MESSAGE: Invalid or missing credentials for url: http://127.0.0.1:9100/tokens

What should you do?

Solution
Run a command like this (but replace “jdoe” and “passwordhere” with your credentials respectively):

st2 login jdoe –password ‘passwordhere’

Now run the st2 command(s).

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How Do You Pass an Array to a Method in Java?

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Problem scenario
You want to pass an argument to another piece of code (e.g., a function in Java). How do you pass an array as a parameter to another portion of code?

Solution
Java only has methods — not functions (according to this posting).

This code (which should be called contInt.java) will pass a two-dimensional array called twoD to the method “coolp”.

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