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Subtitle: When your cat’s food depends on debugging a microcomputer...
? Recap from Day-27
In Day-27, we:
? Step-by-Step Troubleshooting
? 1. Confirming SSH Still Enabled
After scanning the network and identifying live hosts:
We attempted SSH But got:
? 2. Checking Possible Issues
? 3. Re-Insert & Recheck SD Card
Output showed:
SSH file still present
? 4. Trying .local Hostname:
But Fails
:
? Diagnosis: .local resolution (mDNS) not supported or not working on macOS without Bonjour or Avahi.
? 5. Swapping Power & Boot Medium:
Still not able to reach the Pi?
Try this:
This time, use Raspberry Pi Imager and make sure to:
? 6. Hardware Test: Running the Servo Script:
After finally getting access:
You can now test your Python script that triggers the servo.
Example: feed_cat.py
? 7. Schedule with Cron:
Do Crontab -e and Add:
? This runs the script every day at 8:00 AM.
8. Final Status (Day-28)
? Lessons Learned:
#30DaysLinuxChallenge #CloudWhisler
DevOps #Linux #RHCSA #Opensource #AWS #CloudComputing
Catch out by My LinkedIn profile
? Recap from Day-27
In Day-27, we:
- Flashed Raspberry Pi OS (Lite) onto a microSD card
- Enabled SSH by adding a file to /boot
- (Optionally) added Wi-Fi credentials via wpa_supplicant.conf
- Inserted the SD card into the Raspberry Pi and powered it on
- Ran nmap to identify the Pi’s IP — but couldn’t connect via SSH
- Confirming SSH Still Enabled
- ? Checking Possible Issues
- ? Re-Insert & Recheck SD Card
- ? Trying .local Hostname
- ? Swapping Power & Boot Medium
- ? Hardware Test: Running the Servo Script
- ? Schedule with Cron
- Final Status (Day-28)
? Step-by-Step Troubleshooting
? 1. Confirming SSH Still Enabled
After scanning the network and identifying live hosts:
We attempted SSH But got:
? 2. Checking Possible Issues
? 3. Re-Insert & Recheck SD Card
- Removed SD card
- Mounted it back on macOS
- Verified ssh file:
Output showed:
SSH file still present? 4. Trying .local Hostname:
But Fails
:? Diagnosis: .local resolution (mDNS) not supported or not working on macOS without Bonjour or Avahi.
? 5. Swapping Power & Boot Medium:
Still not able to reach the Pi?
Try this:- Use another USB-C cable or power adapter
- Re-flash Raspberry Pi OS
This time, use Raspberry Pi Imager and make sure to:
- Enable SSH in the advanced options
- Set Wi-Fi SSID and password (if headless)
? 6. Hardware Test: Running the Servo Script:
After finally getting access:
You can now test your Python script that triggers the servo.
Example: feed_cat.py? 7. Schedule with Cron:
Do Crontab -e and Add:
? This runs the script every day at 8:00 AM.
8. Final Status (Day-28)? Lessons Learned:
- Enabling SSH by file still works — just double-check the boot!
- mDNS can be flaky; nmap is your friend.
- Power supply really matters for Pi stability.
- Servo motors may need external power for consistent operation.
#30DaysLinuxChallenge #CloudWhisler
DevOps #Linux #RHCSA #Opensource #AWS #CloudComputing
Catch out by My LinkedIn profile