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SGI-STL defines key-value pairs using the following template: template <class T1, class T2> struct pair { typedef T1 first_type; typedef T2 second_type; T1 first; T2 second; pair(): first(T1()), second(T2()) {} pair(const T1& a, const T2& b): first(a), second(b) {} }; The type alias typedef pair<co ...

Understanding Docker What is Docker? Docker is an open-source platform designed for developing, shipping, and running applications. It enables users to separate infrastructure components from applications, creating smaller granular units called containers, which accelerates software delivery speed. While Docker containers share similarities wit ...

What is a Pod? A Pod is the smallest deployable unit in Kubernetes, representing a single instance of a running process within a cluster. It acts as a wrapper for one or more application containers. Pod Deployment Models Two primary models exist for deploying applications within Pods: Single-container Pod: The most common pattern, where a sing ...

Docker's networking capabilities rely on Linux kernel virtualization technologies, particularly network namespaces, virtual Ethernet devices, bridges, and iptables. Network Namespace Isolation Linux network namespaces provide isolated network protocol stacks, enabling different network environments on a single host. Each namespace maintains its ...

Templates Function Templates Function templates enable generic programming by allowing functions to operate with different data types. #include <iostream> using namespace std; template<typename T> void swapValues(T& a, T& b) { T temp = a; a = b; b = temp; } void testFunctionTemplate() { int x = 10, y = 20; ...

Vector A vector is a dynamic array that automatically resizes itself. It supports random access via the [] operator, allowing O(1) time access to any element by index. However, inserting elements at arbitrary positions is not an O(1) operation. Declaration #include <vector> using namespace std; vector<double> data; // A dynamic arr ...

Docker Image Operations Listing all available images on the local system: docker image list Pulling an image from the registry without specifying a tag defaults to the 'latest' tag: docker pull mysql Searching for available images in the registry: docker search mysql Official images are verified and maintained by Docker's team, ensuring ...

A running Linux container is fundamentally an isolated process environment built using three key technologies: Linux Namespaces for isolation, Cgroups for resource limits, and a root filesystem (rootfs) for the application’s view of the file system. This setup naturally divides a container into two conceptual parts: The container image, which ...

Launching and Managing Containers # Spin up an interactive Ubuntu shell docker run -it --rm ubuntu:22.04 bash # Run a detached Nginx container, map host port 8080 docker run -d -p 8080:80 --name web nginx Listing Rseources # Show only active containers docker ps # Show every container, running or stopped docker ps -a # Display locally cache ...

Resuming Existing Containers The docker start command is specifically designed to reactivate containers that have been previously created but are currently in a stopped state. When this command is executed, it locates the referenced container by its ID or name and initializes the main process without reconstructing the container's filesystem or ...