A Technical I.T./DevOps Blog
Problem Scenario
You are using Apple Mail. You want to scroll up and down to see the senders and subjects of emails. You cannot find the vertical scroll bar. What should you do?
Solution
Increase or decrease the window's vertical length by clicking and holding a horizontal edge of the window with the mouse and moving the edge in one direction. After you do this the vertical scroll bar should appear. (We tried this on 12/29/20.)
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Question
You have heard of Jenkins pipelines and projects. What is the difference?
Answer
A Jenkins project is a new word for a Jenkins job. It is "[a] user-configured description of work which Jenkins should perform, such as building a piece of software, etc" (according to Jenkins website).
A Jenkins pipeline is "[a] user-defined model of a continuous delivery" automated stream of procedures related to software (according to Jenkins website).
Problem scenario
You have logged into Uber. You are not sure how to log out of the web browser. You do not want to just close the web browser. What should you do?
Solution
Click "Help".
In the next page you should see your name in the upper right hand corner. Click it, then click "Log off".
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), use these lines:
x = var1.text
print((x).encode('utf'))
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, but with the flag -I/path/to/ nameofc.c
# where /path/to/ is the directory that houses "foobar" that has the file "foobar.h" in it.
# and "nameofc.c" is the name of the c program you are trying to compile.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
apiuse of undeclared type or module
serde_jsonuse 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, go here: https://crates.io/
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.
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?
Solution
Change into the "scripts" directory of in3. For example, you should be in this directory when you run the bash script: /opt/in3-3.1.2/scripts/
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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
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