Turn Your Raspberry Pi into a Plex Media Server

What You’ll Need

• Raspberry Pi 4 (4GB+ recommended) or Raspberry Pi 5
• Raspberry Pi OS installed (see our setup guide)
• External USB hard drive with your media files
• Ethernet connection (strongly recommended over Wi-Fi for media streaming)
• Plex account (free at plex.tv)

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Step 1: Prepare Your External Drive

Connect your USB hard drive to the Pi. Find the drive’s device name:

lsblk

Look for your drive — it’ll appear as something like sda with a partition sda1. Note the size to confirm it’s the right drive.

Create a mount point and mount it:

sudo mkdir -p /mnt/media
sudo mount /dev/sda1 /mnt/media

Verify it mounted correctly:

ls /mnt/media

You should see your media files.

Make the Mount Permanent

To mount automatically on every boot, get the drive’s UUID:

sudo blkid /dev/sda1

Copy the UUID value, then edit fstab:

sudo nano /etc/fstab

Add this line at the bottom (replace YOUR-UUID and adjust the filesystem type if needed):

UUID=YOUR-UUID /mnt/media ext4 defaults,nofail 0 2

Save with Ctrl+X, then Y, then Enter.

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Step 2: Install Plex Media Server

Plex provides an official ARM package for Raspberry Pi. First, add the Plex repository:

# Add Plex GPG key
curl https://downloads.plex.tv/plex-keys/PlexSign.key | gpg --dearmor | sudo tee /usr/share/keyrings/plex-archive-keyring.gpg > /dev/null

# Add the repository
echo deb [signed-by=/usr/share/keyrings/plex-archive-keyring.gpg] https://downloads.plex.tv/repo/deb public main | sudo tee /etc/apt/sources.list.d/plexmediaserver.list

Install Plex:

sudo apt update
sudo apt install -y plexmediaserver

Start and enable the service:

sudo systemctl enable plexmediaserver
sudo systemctl start plexmediaserver

Verify it’s running:

sudo systemctl status plexmediaserver

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Step 3: Set Permissions for Your Media

Plex runs as the plex user and needs read access to your media folder:

sudo chown -R plex:plex /mnt/media
sudo chmod -R 755 /mnt/media

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Step 4: Initial Setup in the Browser

Find your Pi’s IP address:

hostname -I

On a computer on the same network, open a browser and go to:

http://YOUR-PI-IP:32400/web

Sign in with your Plex account and follow the setup wizard:

1. Name your server (e.g. “Home Pi”)
2. Click Add Library
3. Choose the type (Movies, TV Shows, Music)
4. Click Browse for media folder and navigate to /mnt/media/Movies (or wherever your files are)
5. Click Add Library and let Plex scan your files

Plex will scan your library, download artwork, and metadata. This may take a while for large libraries.

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Step 5: Access Plex Anywhere

Install the Plex app on your TV box, phone, or tablet. Sign in with your Plex account — your Pi server will appear automatically when you’re on the same network.

For remote access (streaming outside your home), Plex handles it automatically via Plex Relay. For better performance, enable port forwarding on port 32400 in your router settings.

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Performance Tips

Use Ethernet: Wi-Fi introduces latency and packet loss that causes buffering. Plug your Pi directly into your router.

Enable hardware transcoding (Plex Pass): The Pi 5’s H.265 hardware decoder helps with transcoding. Requires a Plex Pass subscription.

Choose compatible formats: Files in H.264 MP4 containers direct-play on almost every device without transcoding. H.265/HEVC requires more powerful clients.

Keep the Pi cool: Plex under load generates heat. Use a case with a heatsink or fan — the official Pi 5 active cooler is worth it.

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Troubleshooting

Can’t access the web UI: Check that Plex is running (sudo systemctl status plexmediaserver). Check your firewall (sudo ufw status).

Media not showing up: Check folder permissions. Make sure the path you added in Plex matches where your files actually are.

Buffering on playback: Switch to Ethernet. Reduce streaming quality. Check if the file is being transcoded vs. direct playing (Plex dashboard → Now Playing).