VPS ম্যানেজমেন্ট নিয়ে বিস্তারিত

ssh [email protected] -p 22

ls

pwd

cd /

cd ..

cd ~

    sudo apt update
    sudo apt upgrade -y
    sudo apt install nodejs npm -y

mkdir /var/www/hello
cd /var/www/hello
nano server.js

mkdir -p /var/www/hello

const http = require('http');

const hostname = '0.0.0.0';
const port = 80;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World from your VPS!\n');
});

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

node server.js

Ctrl + C 

# Update system
apt update && apt upgrade -y

# Install required packages
apt install -y ca-certificates curl gnupg lsb-release

# Add Docker’s official GPG key
install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg

# Set up repository
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" \
  | tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker
apt update
apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Enable and start Docker service
systemctl enable docker
systemctl start docker

# Verify installation
docker --version
docker compose version

usermod -aG docker $USER

docker run hello-world

docker run -d -p 80:80 --name mysite nginx

docker images
# or
docker image ls 

docker rmi 1b44b5a3e06a

 cd /var/www/hello

cd /var/www/hello

npm init -y

{
  "name": "hello",
  "version": "1.0.0",
  "main": "server.js",
  "scripts": {
    "start": "node server.js"
  },
  "dependencies": {}
}

nano Dockerfile

# Use official Node LTS image
FROM node:22

# Set working directory inside container
WORKDIR /usr/src/app

# Copy package.json first (for caching)
COPY package.json ./

# Install dependencies (empty for now)
RUN npm install

# Copy app source code
COPY . .

# Expose port 80
EXPOSE 80

# Run app
CMD ["node", "server.js"]

docker build -t hello-node .

docker run -d -p 80:80 --name hello-node-app -v /var/www/hello:/usr/src/app hello-node

docker restart hello-node-app

docker run -d -p 8080:80 --name hello-node-app -v /var/www/hello:/usr/src/app hello-node

ssh [email protected] -p 22

mkdir -p /var/www/note

cd /var/www/note

nano server.js

const http = require('http');

const hostname = '0.0.0.0';
const port = 3001;  // different port

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello from second Node app!\n');
});

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

npm init -y

nano Dockerfile

FROM node:22

WORKDIR /usr/src/app

COPY package.json ./
RUN npm install

COPY . .

EXPOSE 3001

CMD ["node", "server.js"]

docker run -d -p 3001:3001 --name note-app -v /var/www/note:/usr/src/app note-node

docker run -d -p 3001:3001 --name note-app --restart unless-stopped -v /var/www/note:/usr/src/app note-node

docker update --restart unless-stopped hello-node-app

docker inspect -f "{{ .HostConfig.RestartPolicy }}" hello-node-app

map[Name:unless-stopped MaximumRetryCount:0]

uname -a          # Show OS, kernel version, architecture
uptime            # Show server uptime and load average
top               # Interactive process monitor
htop              # Better interactive process monitor (if installed)
df -h             # Check disk usage
du -sh /path      # Check folder size
free -h           # Check memory usage

ls                # List files
ls -lh            # List files with human-readable sizes
cd /path          # Change directory
pwd               # Show current directory
mkdir folder      # Create a folder
rm file           # Delete a file
rm -rf folder     # Delete folder recursively (careful!)
cp source dest    # Copy file/folder
mv source dest    # Move/rename file/folder
nano file         # Edit file in terminal
cat file          # Display file content
tail -f file      # Monitor file live (e.g., logs)

whoami            # Current user
id username       # Info about user
adduser username  # Add new user
passwd username   # Set password for a user
usermod -aG group user  # Add user to a group

sudo apt update            # Update package index
sudo apt upgrade -y        # Upgrade installed packages
sudo apt install pkg -y    # Install package
sudo apt remove pkg -y     # Remove package

sudo systemctl status service     # Check service status
sudo systemctl start service      # Start service
sudo systemctl stop service       # Stop service
sudo systemctl restart service    # Restart service
sudo systemctl enable service     # Enable service at boot
sudo systemctl disable service    # Disable service at boot

ping domain_or_ip                 # Test connectivity
curl http://example.com           # Fetch page from command line
wget http://example.com/file      # Download file
netstat -tulpn | grep :80         # Check which process is using port 80
ss -tulpn                         # Modern alternative to netstat

sudo mysql                         # Login as root via socket
mysql -u root -p                    # Login with password
SHOW DATABASES;                     # List databases
CREATE DATABASE dbname;             # Create a database
CREATE USER 'user'@'localhost' IDENTIFIED BY 'password';  # Create MySQL user
GRANT ALL PRIVILEGES ON dbname.* TO 'user'@'localhost';   # Grant privileges
FLUSH PRIVILEGES;                    # Apply changes
EXIT;                                # Exit MySQL

docker ps                    # List running containers
docker ps -a                 # List all containers
docker images                # List images
docker run -d -p 80:80 image # Run container in background
docker stop container_id     # Stop container
docker rm container_id       # Remove container
docker rmi image_id          # Remove image

tail -f /var/log/syslog         # View system log live
journalctl -u service           # View service logs
dmesg                           # Kernel logs