Installing Docker on Raspberry Pi 4 - Who doesn't like virtualization

Diagram of type 1 hypervisor, type 2 hypervisor and os level virtualization(container)

Steps involved in installing Docker on Raspberry Pi 4

Update and Upgrade 

1. sudo apt-get update

2. sudo apt-get upgrade

3. curl sSL https://get.docker.com -o get-docker.sh

Execute the shell script using the command

4. sudo sh get-docker.sh

Add the current user to the docker group

5. sudo usermod -aG docker $USER

Screenshot of before and after using the usermod command

Above entries are from the file /etc/group 

6. sudo reboot

groups cmd will show that docker the group member of the user qwakaw

To view the docker version

7. docker version

Execute a simple hello world container 

8. docker run hello-world

Hiccups and fews cmds 

List packages installed Raspberry Pi OS which is Debian based

apt list --installed

dpkg -l | grep neofetch

Hangs during upgrade process

Setting up realvnc-vnc-server (7.13.1.57) ...

Updating /etc/pam.d/vncserver

Updating /etc/pam.conf... done

Looking for font path...

Solution

sudo apt-get remove realvnc-vnc-server

cmd to view the env variables

printenv 

printenv USER

or

echo $USER

6printenv-cmd.png

Used Photoflare to crop images in raspberry Pi 4(be patient when using the selection tool)

Samsung Galaxy Tab A9+ 5G

Had been looking for large screen device which elderly(not much of tech savvy) could use for their regular browsing as well as support regular phone call and SMS on the same device.

More than enough specs about the device are mentioned on the manufacturer website.

https://www.samsung.com/au/tablets/galaxy-tab-a/galaxy-tab-a9-plus-5g-graphite-64gb-sm-x216bzaaats/buy/

This log is here as a reference/redundant data :)  

Processor Type: Qualcomm Snapdragon

Processor Cores: Octa Core

Processor Model Number: SM6375

Processor Max. Clock Speed (GHz): 2.2

RAM (GB): 4

SSD storage: 64GB

Connectivity

USB Version: USB 2.0

Location Technology: GPS, Glonass, Beidou, Galileo, QZSS

Earjack: 3.5mm Stereo

Wi-Fi: 802.11 a/b/g/n/ac 2.4G+5GHz, VHT80

Wi-Fi Direct: Yes

Bluetooth Version: Bluetooth v5.1

NFC: No

Bluetooth Profiles: A2DP, AVRCP, DI, HFP, HID, HOGP, HSP, MAP, OPP, PAN, PBAP

Sensors

Accelerometer, Gyro Sensor, Geomagnetic Sensor, Hall Sensor, Light Sensor

Battery Capacity (mAh, Typical): 7040

Samsung galaxy Tab A9+ 5G - Supported network bands

Network

2G GSM

GSM850, GSM900, DCS1800, PCS1900

3G UMTS

B1(2100), B2(1900), B4(AWS), B5(850), B8(900)

4G FDD LTE

B1(2100), B2(1900), B3(1800), B4(AWS), B5(850), B7(2600), B8(900), B12(700), B13(700), B17(700), B20(800), B26(850), B28(700), B66(AWS-3)

4G TDD LTE

B38(2600), B40(2300), B41(2500)

5G FDD Sub6

N1(2100), N3(1800), N5(850), N7(2600), N8(900), N20(800), N28(700), N66(AWS-3)

5G TDD Sub6

N38(2600), N40(2300), N41(2500), N77(3700), N78(3500)

Different frequency bands for mobile phones

AU Mobile bands

2G and 3G networks are no more.

Au - telecom bands

To view information on individual cell tower/Mobile Network base stations visit Radio Frequency National Site Archive(RFNSA)https://www.rfnsa.com.au/

IN - telecom bands

Other Freqnecy bands available in IN are

2G (GSM) - still operational

•  900MHz
•  1800MHz

3G (UMTS) - shutdown by most operators 

• 2100 MHz

4G (LTE)

• 1800MHz
• 2300MHz
• 850MHz
• 700MHz

Renaming files using F2 keyboard shortcut in pcmanfm(File Manager) - Raspberry Pi OS

 Raspberry pi os for Raspberry Pi 4/5 doesn't respond to F2 keyboard shortcut for renaming file.

Disabling an option in the File manager(FYI file manager is pcmanfm) will enable the F2 shortcut.

In pcmanfm(file manager) -> Edit -> Preference

Layout->Disable Display Simplified user interface and menu

ref :- https://forums.raspberrypi.com/viewtopic.php?f=91&t=217486&p=1337477#p1337475

Draw Arrow in GIMP 2.10

 cp arrow-set-size.scm to 

/home/qwakaw/.config/GIMP/2.10/scripts

or

${HOME}/.config/GIMP/2.10/scripts/

Open GIMP and use Path tool to draw a path.

Then use Tools -> Arrow

Legacy VGA monitor - Connecting a VGA monitor to the Raspberry pi 4/5 and 3.5mm audio jack to Raspberry Pi 5

 For Video **

Used a VGA to HDMI adapter -> HDMI to micro HDMI adapter

For Audio **

There are USB headphone but for me 3.5mm audio output was provided in the VGA to HDMI adapter

Installing Raspberry Pi OS on SD card (Raspberry pi 4/5 Model B)

 Install raspberry Pi OS using Imager provided in the link

https://www.raspberrypi.com/software/

If you are trying to install Raspberry Pi OS from Raspberry Pi OS. Use rpi-imager, which is provided in the repository

In Raspberry Pi OS

From accessories -> Raspberry Pi Imager

Choose Raspberry Pi Device

Choose Operating System

Choose storage

In the next step, customise OS settings -> Edit Settings

Provide Hostname, Username, Password, Wireless LAN, Enable SSH

Apply OS customisation settings

All existing data from SDXC card will be erased.

Output of neofetch on both Raspberry Pi 4/5

How to convert MP4 to MP3 using VLC

 a) Select Media -> Convert/Save in VLC (page1)

b) In open media -> File tab add the mp4 file (page2)

c) Convert/save button 

d) Select profile -> Audio - MP3 in settings(page3)

e) Provide the destination file with .mp3 extention

d) Click start button