Host Privilege ConfigurationAdministrative permissions are necessary for managing container environments. Verify the active session and elevate privileges:id sudo -i If the administrative account lacks credentials, assign them using:echo "root:strongpass" | chpasswd Network Isolation and Remote Acce...
1. Docker Overview (1) What is Docker? Docker is an open-source application container engine, developed in Go and open-sourced under the Apache 2.0 license. Docker is an open-source tool for running applications in Linux containers, providing a lightweight "virtual machine". Docker's conta...
This guide demonstrates how to configure MySQL master-slave replication using Docker containers in a WSL2 Ubuntu environment. The setup involves two independent MySQL instances where one acts as the primary (master) and the other as a read-only replica (slave). Environment Setup The environment uses...
Docker Compose Overview Problem Statement When working with Docker, complex applications typically require multiple services running simultaneously. A typical Django project might need MySQL, Redis, and other dependencies. Maanging these as separate containers individual becomes cumbersome and error...
Running Jenkins in Docker Start Jenkins container witth the following command: docker run -d \ --name jenkins-server \ -p 8080:8080 \ -p 50000:50000 \ -v /opt/jenkins/data:/var/jenkins_home \ -v /var/run/docker.sock:/var/run/docker.sock \ -v $(which docker):/usr/local/bin/docker \ -e TZ=UTC \ jenkin...
Docker Environment Setup (CentOS) sudo yum install -y yum-utils sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo sudo yum install -y docker-ce docker-ce-cli containerd.io sudo systemctl enable --now docker Workspace and Configuration Layout mkdir -p /opt/ci/...
1. Persisting Firewall Port Rules When exposing services to external traffic, port configurations must survive system reboots. Using firewalld, rules are applied to the runtime environment by default. To make them permanent, append the --permanent flag: sudo firewall-cmd --zone=public --add-port=808...
Overview of OpenSearch OpenSearch is an open-source, distributed search and analytics suite derived from a fork of Elasticsearch. It supports use cases such as full-text search, log and infrastructure monitoring, security analytics, and operational observability. The project is maintained under the...
Clear any existing container runtime installations: sudo yum remove -y docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine docker-ce docker-ce-cli containerd.io Install necessary dependencies and configure the repository: sudo...
Docker's core value lies in virtualization, or more specifically, environment isolation. Through virtualization technology, Docker implements virtual environments that solve dependency issues in configuration and deployment, enabling decoupling. My understanding of virtualization comes from "O...
