Linux & Networking Basics

System Design

1. RHEL Local Instalation 🧑‍💻

1. Download the related image (in this case RHEL 9)

2. Import the iso and config like this following picture:

3. SSH the network enp0s3 interface

2. RHEL Basic Command ⌨️

1. Navigating Path

   • Current Path

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Listing File and Directory

     In this directory the only directory exist is /docs. Other that that is the default file that uses for my bash shell configuration.

   • Change Directory

     From home directory we chage to the docs directory. After we list what's in it, there is conf.txt file which are different from home dir.

2. File Management

   • Create File

     Then I add a new file named Dockerfile which contains nothing inside.

   • Edit File

     We can edit the Dockerfile using vim text editor.

     After the configuration is finished, it can be saved and see the file by cat command.

   • Copy File

     We can copy what's inside the Dockerfile configuration to some other file directory. In the example above we copying the file to ~/docker/Dockerfile.bak.

   • Move File

     We also can move the Dockerfile.bak in ~/docker directory to current dir which is ~/docs.

     This command also can used to change the filename.

   • Remove File

     Delete the backups file and see the result.

3. Directory Management

   • Create Directory

     We can create new directory named anything except this.

   • Copy Directory

     We can copy the entire existing docs/ directory to kube/.

   • Move Directory

     Also we can move the entire existing docs/ directory to docker/.

   • Remove Empty Directory

     If the directory is empty just simply use command above.

   • Remove Directory

     If the directory is filled with files, execute it with -r option stands for recursive.

4. User & Group Management

   • User Creation

     We can create the user in the same machine. In this case is king and configure the password with command below.

   • Group Creation

     Then we can add the user to the group for make the permission management to directory or file is easier.

5. File Permission

   • Change File Permission

     As you can see from here, the code.sh file is just have a read permission.

     We can change it to make the file executable by the +x operation.

   • Change Directory Ownership

     Then to change the ownership we can simply use the command above.

6. Process Management

   • Listing Process

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Background Jobs

     In this directory the only directory exist is /docs. Other that that is the default file that uses for my bash shell configuration.

   • Killing Process

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Monitoring Process

     In this directory the only directory exist is /docs. Other that that is the default file that uses for my bash shell configuration.

7. Service & Daemon Management

   • Service Status

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Control System Service

     In this direc

3. RHEL Networking 🛜

1. Basic Network Display

   • Displaying IP Address

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Displaying IP Route

     In this directory the only directory exist is /docs. Other that that is the default file that uses for my bash shell configuration.

   • Displaying Socket Statistic

     

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

2. Change Network Interface with nmcli

   • Listing Active Interface

     

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Create New Connection Named static-enp0s3

     

     In this directory the only directory exist is /docs. Other that that is the default file that uses for my bash shell configuration.

   • Configuring DNS

     

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Make the connection up and running

     

     In this directory the only directory exist is /docs. Other that that is the default file that uses for my bash shell configuration.

     

4. Bridge Network 📲

3. Configure Bridge Network Interface

   • Create Bridge Interface named br0

     

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

     

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

   • Make the connection up and running

     

     As you can see from here, my relative current path is /home/rafli. From here you can know what directory you're in which is home dir.

     

   • Test if the new bridge network is properly configured

     

     In this directory the only directory exist is /docs. Other that that is the default file that uses for my bash shell configuration.