Understanding Containers: A Deep Dive Implementation

Introduction to Containers

Containers have revolutionized how we deploy applications. In this tutorial, we'll build a basic container runtime to understand the underlying technology.

Linux Namespaces

Namespaces are a fundamental feature of Linux that make containers possible. Let's explore the key namespaces:

• PID Namespace - Process isolation
• Network Namespace - Network isolation
• Mount Namespace - Filesystem isolation
• UTS Namespace - Hostname isolation

Basic Container Implementation

package main

import (
    "os"
    "os/exec"
    "syscall"
)

func main() {
    cmd := exec.Command("/bin/bash")
    cmd.SysProcAttr = &syscall.SysProcAttr{
        Cloneflags: syscall.CLONE_NEWUTS |
                   syscall.CLONE_NEWPID |
                   syscall.CLONE_NEWNS,
    }
    cmd.Stdin = os.Stdin
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr

    if err := cmd.Run(); err != nil {
        panic(err)
    }
}