deVops pathshala Blog – Notes for Me & You

  • Computer Networking refers to interconnected computing devices that can exchange date and share resource with each other. Hardware Requirements    • Etherent Card, NIC, Interface, Lan Card  • Cables (wireless/wired)  • Networking Devices (HUB/Switch/Router)  Logical Terms   • IP Address (Public,Private,static,Dynamic,Virtual)   • Mac Address   • Source & Destination Address   • Ports, Sockets  • Network Address, Broadcast Address Mac address:- Mac address is the physical address , which uniqualy identifies each devices on a given network. It’s persistent.  IP address:- IP address stand for “Internet Protocol Address”. The inetenet protocol is a set of rule for communication over the internet. • Type of IP addres   1. IPv4 (Internet Protocol Version 4)   2. IPv6 (Internet Protocol Version 6)  IPv4 = 32 bit   IPv6 = 128 bit Bit = 0,1   *IPv4 = 32 bit 4 octats...

  • Storage Type   1. Floppy disk   2. CD/DVD  3. Pendrive/Memory card  4. Harddisk--> IDE,SATA,SSD,Nvme  Disk Partitioning → Disk partitioning allows system administrators a hard drive into multiple logical stroge units, referred to as a partitions.   → The process to dividing a disk into logical areas that can be worked with separately id called partitioning.  ❖ Types of Partition Scheme   1. MBR  2. GPT LVM:- Logical Volume Manager   LVM (Logical Volume Manager) is a Linux feature that allows flexible disk management. It lets you combine multiple disks into a storage pool, create logical partitions, and resize them dynamically without downtime   • PV:- Physical Volume In LVM (Logical Volume Manager), a Physical Volume (PV) is simply a storage device (like a hard disk, SSD, or a partition) that is prepared for use in LVM. • Before using a disk in LVM, you must convert it into a PV using the pv...

  VPC:-   A VPC (Virtual Private Cloud) in AWS is a private, isolated network you create in the AWS cloud to launch and manage your resources like EC2 instances, databases, etc.  Think of it as your own private data center inside AWS, where you have full control over:   • IP address ranges (CIDR blocks)  • Subnets (public & private)   • Routing (via route tables)  • Internet access (via Internet Gateway or NAT Gateway)   • Security (via security groups & network ACLs) Example    • Suppose you rent a building (AWS Cloud).   • Inside it, you design your own office layout (VPC).   • You decide rooms (subnets), doors (gateways), and locks (security groups). Key Features of VPC    1. Isolated Environment – Your VPC is separated from other AWS users’ networks.  2. Customizable IP Range – You choose IPv4/IPv6 address range.  3. Multiple Subnets – Create public and private subnets. ...

  1. docker –version --> to check docker version   2. docker version --> to check client and host version    3. docker container run httpd --> create container foreground   4. docker container run –d httpd --> create container byground  5. docker container ls --> to show only running container    6. docker container la –a --> to show all container   7. docker ps --> to show container   8. docker container stop container name --> to stop container  9. docker container start container name --> to statr container    10. docker container rm container name --> to delete stop container    11. docker container rm –f container name --> to delete running container   12. docker container run –d –it ubuntu --> to create OS image  13. docker image ls --> to show images   14. docker container run –d –name team httpd --> naming the...

1. Docker Client: a. This is where the user interacts with Docker using commands like docker build, docker run, docker pull, etc. b. It sends these commands to the Docker Daemon.   2. Docker Daemon (dockerd):  a. This is the background service that actually performs all Docker operations like building images, running containers, and communicating with the Docker registry.  b. It listens to the Docker Client's requests and manages Docker objects.  3. Dockerfile:  a. A text file that contains a set of instructions to create a Docker image.   b. The Docker Daemon reads this file to build a Docker image using the docker build command.   4. Docker Image:  a. A read-only template that contains the application code, runtime, libraries, and dependencies.  b. This is built from the Dockerfile and used to launch containers.   5. Docker Container:   a. A running instance of a Docker image.  b. It is isola...