Author: ron (Page 24 of 34)

Create a New Azure Function App with .Net Core by Azure Function Core Tools

November 11, 2019 / ron / 0 Comments

Requirements

.Net Core
Azure Functions Core Tools

Procedures

Create a directory to house your azure function codes.
Using the command console, navigate to the newly created directory.
Execute the following command and select dotnet (i.e. usign the arrow keys) and press enter.
```
func init
```
Wait for the command prompt to come back.
On the new prompt, execute the following command and select the template you want (i.e. using the arrow keys) and press enter.
```
func new
```
Type a name for the function and press enter.

Adding a Package Reference into a .Net Core Project

October 18, 2019 / ron / 0 Comments

The simplest way to add a new package reference in a .net core project is to use the following command:

dotnet add package <PACKAGE_NAME> [-v <VERSION>]

Where:

Parameter	Description
PACKAGE_NAME	The name of the package name to be added as reference.
VERSION	The specific version of the package.

Displaying a Mapped Network Drives in Windows

October 16, 2019 / ron / 0 Comments

If you ever wonder where are those mapped network drives are pointing. You can do the following:

Open a console terminal (e.g. cmd).
Run the following command:
```
net use
```

This command will show you the status and mapping of mapped network drives you have.

Publishing to a Single Exe File

October 14, 2019 / ron / 0 Comments

Publish a .Net Core Console Application into a 64-bit single executable file using the following command:

dotnet publish -r win-x64 -c Release /p:PublishSingleFile=true /p:PublishTrimmed=true

Finding a Nuget Package by a Particular Type

October 12, 2019 / ron / 0 Comments

To find the a nuget package if you already know a particular type, use the following address:

https://packagesearch.azurewebsites.net/

Schedule Certbot-Auto to Auto Renew Weekly with NGINX

October 10, 2019 / ron / 0 Comments

Create the file in /etc/cron.weekly/certbot-renewal using the following command
```
sudo vi /etc/cron.weekly/certbot-renewal
```

Place in the following in the file and save it:

#!/bin/sh

/usr/sbin/certbot-auto renew --no-bootstrap --no-self-upgrade --post-hook "service nginx restart"

Change the mode of file to 755 using the following command:
```
sudo chmod 755 /etc/cron.weekly/certbot-renewal
```

Installing Let’s Encrypt Certbot-Auto

October 10, 2019 / ron / 0 Comments

Change the directory to /usr/sbin

Download certbot-auto using the following command:

sudo wget https://dl.eff.org/certbot-auto -O /usr/sbin/certbot-auto

Change the mode of certbot-auto to 755 using the following command:
```
sudo chmod 755 /usb/sbin/certbot-auto
```

Unban an IP Banned by Fail2Ban

October 10, 2019 / ron / 0 Comments

Use the following command:

sudo fail2ban-client set <JAIL_NAME> unbanip <IP_ADDRESS>

Where:

JAIL_NAME

The name of the jail.

Use the following command to find-out what jail names you have:

sudo fail2ban-client status

IP_ADDRESS

The IP address that was banned.

Securing Ubuntu SSH

October 9, 2019 / ron / 0 Comments

Update the /etc/ssh/sshd_config file to have the following added:
```
PermitRootLogin no
```
Install fail2ban using the following command:
```
sudo apt-get install fail2ban
```

Create the file /etc/fail2ban/jail.d/jail-debian.local file to have the following:

[sshd]
 enabled = true
 port = ssh
 filter = sshd
 logpath = /var/log/auth.log
 maxretry = 6
 bantime = -1

Restart the service using the following command:
```
sudo service fail2ban restart
```

See Unbanning an IP

Using Scanner to Read a Text File

October 2, 2019 / ron / 0 Comments

Reading a text file using java.util.Scanner in Java.

StringBuilder text = new StringBuilder();
try(Scanner scanner = new Scanner(new BufferedReader(new FileReader("<FILENAME>")))) {
    while(scanner.hasNext()) {
        text.append(scanner.nextLine()).append("\n");
    }
} catch (FileNotFoundException e) {
    e.printStackTrace();
}
System.out.println(text.toString());

Where:

FILENAME

The text file to read.

Author: ron (Page 24 of 34)

Create a New Azure Function App with .Net Core by Azure Function Core Tools

Adding a Package Reference into a .Net Core Project

Displaying a Mapped Network Drives in Windows

Publishing to a Single Exe File

Finding a Nuget Package by a Particular Type

Schedule Certbot-Auto to Auto Renew Weekly with NGINX

Installing Let’s Encrypt Certbot-Auto

Unban an IP Banned by Fail2Ban

Securing Ubuntu SSH

Using Scanner to Read a Text File

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