A Technical I.T./DevOps Blog
Problem scenario
You are trying to print out a variable in Python. But you get an error like this: “UnicodeEncodeError: ‘ascii’ codec can’t encode character ‘\xa0’ in position 70567: ordinal not in range(128)”
What should you do?
Solution
Root cause: A variable needs to be encoded as UTF instead of the default ASCII encoding.
Procedures
Assuming that var1 is a variable holding the results of a requests.get(url),
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Problem scenario
You try to compile a C program, but it fails with “compilation terminated.” The error message says “foobar/foobar.h No such file or directory.” What should you do?
Solution
This solution does not address where should header files for c go. But it addresses the problem.
Find where foobar.h is: sudo find / -name foobar.h
Run the gcc command again,
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Problem Scenario
You run a “cargo run” command. You get an error like one or more of the following:
use of undeclared type or module api
use of undeclared type or module serde_json
use of undeclared type or module async-std
What should you do?
Solution
Update the Cargo.toml file. The dependencies section should have an entry like one of the following (but the version number may or may not differ):
[package]
name = “in3-tutorial”
version = “0.0.1”
authors = [”reader@medium.com”]
edition = “2018”
[dependencies]
in3 = “0.1.7”
async-std = “1.5.0”
futures-executor = “0.3.5”
serde_json = “1.0”
ethabi = “13.0.0”
ethereum_abi = “0.2.0”
ethbloom = “0.10.0”
[[bin]]
name = “in3”
path = “/home/jdoe/rust/contint.rs”
If you are not sure what version is valid,
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Continue reading “How Do You Troubleshoot the Cargo/Rust Error “use of undeclared type or module”?”
Problem scenario
You have some Instavoice voicemails on your smart phone. You want to delete them. What do you do?
Solution
Go to the voicemails in the app. Tap and hold a voicemail you want to delete. It should be highlighted with a gray color. A trash can icon should appear in the upper right hand corner. Click the trash can icon.
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Continue reading “How Do You Delete an Instavoice Voicemail?”
Problem scenario
You are running build_rust.sh to use Blockchains’ Incubed. But you get an error message like this:
cp: cannot stat ‘c/CMakeLists.txt’: No such file or directory
cp: cannot stat ‘c/macro.cmake’: No such file or directory
cp: cannot stat ‘c/compiler.cmake’: No such file or directory
cp: cannot stat ‘c/docs’: No such file or directory
cp: cannot stat ‘c/src’: No such file or directory
cp: cannot stat ‘c/include’: No such file or directory
cp: cannot stat ‘CMakeLists.txt’: No such file or directory
What should you do?
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Problem scenario
What is a good command to see the overall health of your Kubernetes servers (nodes)?
Solution
Run this command: kubectl describe nodes
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Continue reading “How Do You Briefly Look at the Conditions of Kubernetes Nodes?”
Problem scenario
You want to delete a trail from CloudTrail so you can delete an S3 bucket (to avoid AWS charges). How do you do this?
Solution
Warning: You may be able to delete the non-empty S3 bucket that the Trail was supposed to use without deleting the Trail.
Procedures
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Continue reading “How Do You Delete a Trail from CloudTrail?”
Problem scenario
You run Java programs on your Linux server. You want to view content of Java thread dumps. What should you do?
Solution
Prerequisites
Install Java if it has not already been installed. See this posting if you need assistance.
You may or may not want to learn more about what a Java thread is;
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Problem scenario
You run a Cargo command, but you get this:
error: no such command `add`
Did you mean `b`?
What should you do?
Solution
Run this: sudo cargo install cargo-edit
It can take 15 minutes to run. This should eliminate the problem.
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Continue reading “How Do You Troubleshoot the Cargo Problem “error: no such subcommand: add”?”
Problem scenario
How do you write a Python 3 program to parse the text of a web page and determine if a string is on the web page or not?
Solution
Change the “yoururl” variable assignment and the “searchterm” assignment below to what you desire. Then run the program below:
import re
import requests
yoururl = ‘https://www.continualintegration.com/’
searchterm = “learned”
r = requests.get(yoururl)
found = re.search(searchterm, …
Continue reading “How Do You Get Python to Search a Web Page for a Specific Pattern?”