Linux

• Disk / Space CMD
• Mount network share
• Vault 2 issues with Nginx Proxy not working
• 📂 Sharing a Folder on Debian Linux via Samba
• 📚 Mounting a Network Share for Docker on Debian

Disk / Space CMD

Disk / Space CMD

Will give the usage of the user you are logged in as

sudo du -h --max-depth=1

The df command primarily checks disk usage on a mounted filesystem. If you don't include a file name, the output shows the space available on all currently mounted filesystems. Disk space is shown in 1K blocks by default:

df -h

List All Block Devices in Linux

lsblk

lsblk

Mount network share

sudo mount.cifs //192.168.1.252/5tb /5TB -o user=USER,pass=PASS

Install CIFS

sudo apt install cifs-utils 

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mount.cifs //192.168.1.251/hel /mnt/share/NAS/hydra -o user=USER,pass=PASS

Vault 2 issues with Nginx Proxy not working

Check logs in Portainer - bind port already used (80)

 lsof -i tcp:80

This will show whats running on that  port

fuser -k 80/tcp

This should kill the process, but if not do the below (based on the COMMAND Name)

systemctl stop haproxy

📂 Sharing a Folder on Debian Linux via Samba

Last Updated: 2025-06-01
Applies To: Debian 10+, Ubuntu, other Debian-based distributions
Use Case: Share a local folder over the network for access from Windows, macOS, or Linux machines.

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🧰 Prerequisites

• Debian-based Linux system

• sudo privileges

• Network connectivity to target devices

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🔧 Step 1: Install Samba

Update the system and install Samba:

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📁 Step 2: Create a Shared Directory

Choose or create the folder to share. Example:

This creates a public share folder with loose permissions (for anonymous access).

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🛠️ Step 3: Configure Samba

Edit the Samba configuration file:

Add the following to the bottom of the file:

📌 Tip: force user = nobody ensures files are written as the nobody user, preventing permission issues.

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🔄 Step 4: Restart Samba Services

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🔥 Step 5: Open Firewall (If Enabled)

For systems using ufw (Uncomplicated Firewall):

Or manually:

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🧪 Step 6: Access the Share

From a Windows or Linux machine:

• Open File Explorer or file manager.

• Go to: \\<your-debian-ip>\PublicShare

You should see the shared folder contents.

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🔐 Optional: Secure with Username/Password

To restrict access:

1. Disable guest access:

   ini

   guest ok = no

2. Create a Samba user:

   bash

   sudo smbpasswd -a <your-linux-user>

3. Restart Samba:

   bash

   sudo systemctl restart smbd

You’ll now need a username/password to access the share.

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🧹 Troubleshooting

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📎 Related

• /etc/samba/smb.conf: Samba main configuration file

• sudo testparm: Validates Samba config

• sudo smbstatus: Shows active connections

📚 Mounting a Network Share for Docker on Debian

 

🧭 Overview

This guide shows how to mount a CIFS/SMB network share on a Debian-based system and use it as a volume in Docker Compose. Useful when your Docker container needs access to shared files hosted on another machine (e.g., a NAS, Windows PC, or another Linux box).

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🛠️ Step 1: Install CIFS Utilities

sudo apt update
sudo apt install cifs-utils

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📂 Step 2: Create a Mount Point

sudo mkdir -p /mnt/downloads

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🔐 Step 3: Mount the Share

sudo mount -t cifs //LORGAR/Downloads /mnt/downloads -o username=slitzer,password=blink182,vers=3.0

Replace:

• //LORGAR/Downloads — with the remote share path
• username and password — with valid credentials
• vers=3.0 — adjust based on your SMB version (2.0, 3.1.1, etc.)

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💾 Optional: Persistent Mount via fstab

Edit /etc/fstab:

//LORGAR/Downloads /mnt/downloads cifs username=slitzer,password=blink182,vers=3.0,uid=1000,gid=1000 0 0

Using a secure credentials file:

# /root/.smbcredentials
username=slitzer
password=blink182

Then in /etc/fstab:

//LORGAR/Downloads /mnt/downloads cifs credentials=/root/.smbcredentials,vers=3.0,uid=1000,gid=1000 0 0

Don't forget: chmod 600 /root/.smbcredentials

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🐳 Step 4: Use in Docker Compose

Update your docker-compose.yml:

version: '3'
services:
  myapp:
    image: myapp/image
    volumes:
      - /mnt/downloads:/app/shared

This maps the mounted network share inside the container.

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🔍 Troubleshooting

• Check if mounted: mount | grep downloads or df -h
• Check permissions: ls -la /mnt/downloads
• Logs: dmesg, journalctl -xe

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✅ TL;DR

sudo apt install cifs-utils
sudo mkdir -p /mnt/downloads
sudo mount -t cifs //REMOTE_HOST/Share /mnt/downloads -o username=...,password=...,vers=3.0

Then reference /mnt/downloads in your Docker volumes.

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🧠 Pro Tip: Avoid hardcoding passwords by using credential files, especially for systems in production.