A Technical I.T./DevOps Blog
Problem scenario
You are trying to learn to program in Go. How do you use a function?
Solution
Prerequisite
This assumes that you have installed Golang; if you need assistance with this, see this posting.
Procedures
1. Create a file called b.go with this as the content:
package main
import “fmt”
// ContintFunction will display a message
func ContintFunction() {
fmt.Println(“Hello from Continual Integration”)
}
func main() {
ContintFunction()
}
2.
…
Problem scenario
You want to find what Java packages are available on the configured repositories of the Linux server you are using. What do you do?
Solution
Run a command like this: apt-cache search java
You can replace “java” with a word of the package you want to install.
If you want to learn more about the package and have its exact name,
…
Problem scenario
You want to find what Java packages are available on the configured repositories of the Linux SUSE server you are using. What do you do?
Solution
Run this command: zypper se java
You can replace “java” with a word of the package you want to install.
…
Problem scenario
You want to write a program to call a bound function in a new thread. How do you do this?
Solution
Run this program (e.g., python foobar.py):
import _thread as thread
class mighty:
def cool():
print(“Cool.”)
def contint():
print(“Hello!”)
if name == “main”:
foobar = thread.start_new_thread(mighty.cool, () )
print(“thread finished…exiting”)
…
Problem scenario
You want to generate a large log file to use later on (e.g., for the Elastic Stack or Splunk). How do you create a 100 GB log file?
Solution
Find an example log to base the generation off. Run these commands to find a log that you would want to copy its format:
cd /var/log
ls -lh –sort=size
sudo tail foobar # where foobar is the name of the log file you want to sample
2.
…
Problem scenario
You want to create bytecode using Golang. What do you do.
Solution
Prerequisite
Install Golang. If you need assistance, see this posting.
Procedures
Create a Go script that you can run with go run nameOfProgram.go
Run this: go build nameOfProgram.go
Run this: ./nameOfProgram
…
Problem scenario
Lists have a fixed length number of discrete items. You want the items in the list to be strings. How do you create a list of strings in Golang?
Solution
1. Use this program called animal.go:
package main
import “fmt”
func main() {
var x [10]string
x[0] = “dog”
x[1] = “cat”
x[2] = “hamster”
x[3] = “rabbit”
x[4] = “chicken”
for i := 0; …
Continue reading “How Do You Create a List of Strings in Golang?”
Problem scenario
You try to start an old SonarQube instance but with a new database connection. In the web.log file you see a message like this: “Can not connect to database. Please check connectivity and settings.” What should you do?
Solution
Go to sonar.properties. Find the connection string for the new database. It should look something like this:
sonar.jdbc.url=jdbc:oracle://FQDN:1521:XE
The default port for Oracle databases is 1521.
…
Problem scenario
In Chrome you deleted browsing data including cookies and autofill form data. You closed the browser and reopen it, but old URLs still show up. What should you do?
Solution
Go to History -Clear browsing data -and go to “Time Range” (the drop down menu). Choose “All time” and then go to “Clear data”.
…
Continue reading “How Do You Delete Browser Data from Chrome when Your First Attempt Failed?”
Problem scenario
Using the API you want to know if a given GitHub repository’s branch is protected. What do you do?
Solution
Draft the four commands below. Replace “jdoe” with the GitHub username. Replace “organizationname” with the organization name in your repo. Replace “repositoryname” with the repository name. Replace “master” with the branch you want to check. Then run the four commands below.
…
Continue reading “How Do You Find Out if a GitHub Repository’s Branch is Protected or Not?”