Problem scenario
You ran: sudo bash build_rust.sh
It failed with this message: “error: failed to run custom build command for openssl-sys v0.9.60”
Solution
Run this:
sudo apt -y install pkg-config
…
Problem scenario
You want to list IAM roles that have access to EKS. You have the AWS CLI installed and jq installed. What should you do?
Solution
Run this command:
aws iam list-roles | jq -r ‘.Roles[] | select(.AssumeRolePolicyDocument.Statement[].Principal.Service==”eks.amazonaws.com”)’ …
Continue reading “What AWS CLI Command Can You Run to List Roles with EKS Access?”
Problem scenario
You want to iterate through two lists and perform some operation. The lists are not equal length. You want to iterate through them in some type of step-by-step fashion despite their lack of equality. What should you do?
Solution
Use this as an example:
list_a = [1, 2, 3]
list_b = [”dog”, “cat”, “rat”, “chicken”]
i = 0
j = 0
while (i < …
Continue reading “How Do You Iterate Through Two Lists of Unequal Length in Python?”
Problem scenario
You want to test if a dictionary exists or not. You know its name if/when it exists. What do you do?
Solution
# Suggested usage: 1) run it is as it is.
# 2) uncomment out the dictionary_name1 definition stanza.
# Then run this program again.
#dictionary_name1 = “good_dict”
if ‘dictionary_name1’ in locals():
print(“IT IS IN LOCALS”)
else:
print(“IT IS NOT IN LOCALS”)
if ‘dictionary_name1’ in globals():
print(“IT IS IN GLOBALS”)
else:
print(“IT IS NOT IN GLOBALS”) …
Continue reading “How Do You Write Python Code to Test if a Dictionary Exists?”
Problem scenario
You are trying to run “kubeadm init”, but you get this error:
“failed with error: Get “http://localhost:10248/healthz”: dial tcp 127.0.0.1:10248: connect: connection refused.”
What should you do?
Solution
Is the kubelet service running? Run this: sudo systemctl status kubelet
To install the kubelet, see this posting for How Do You Install the kubelet on any type of Linux?
…
Problem scenario
You are trying to run a kubeadm command. But you get this error:
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR Port-10250]: Port 10250 is in use
[preflight] If you know what you are doing, you can make a check non-fatal with –ignore-preflight-errors=…
What should you do?
Solution
Remove the kubelet that snap installed;
…
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…
Problem scenario
Your Python MR (mapreduce) job is failing. You do not know why.
You may or may not get an error like this: “Error: java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1”
Other symptoms you may experience is the MapReduce job takes a great deal of time. It seems to hang. What should you do?
Solution
- Determine which map .py file you are using and which reduce .py file that you are using.
…
Problem scenario
Linux SUSE won’t install. When the installation process is happening it stops with an abortive error that exits the pretty GUI menu sequence. You get “linuxrc 7.0.15 (Kernel 5.3.18-lp152.19-default) an error occurred during the installation.” What should you do to install SUSE?
Possible Solution #1
Start over. When you see this window “YaST2 The system has an active network connection.
…
Problem scenario
You want to ensure you web application is protected from buffer overflows, injection attacks and other vulnerabilities that could reveal sensitive information. How do you harden a website application and follow security recommended practices?
Possible Solution #1
Endeavor to prevent injection attacks. Minify the website application by not allowing file uploads and limit POST requests to 2 MB (page 28 of Node.js Security by Liran Tal).
…