shubh-networking

Shubham-Yadav/01-Networking/README.md

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+## Introduction
+
+### internet 
+- the internet is a global network of computers and devices that can be reached by any device on the internet.
+
+### server 
+- a server is a computer that stores data and services.
+
+### client
+- a client is a computer that sends requests to a server.
+- a client can be a web browser, a mobile device, a desktop application, or a command line interface.
+
+### protocol
+- a protocol is a set of rules that describes how a client and server communicate.
+
+
+an ip address is a number that identifies a device on the internet.
+
+- **LAN** - local area network
+- **MAN** - metropolitian area network
+- **WAN** - wide area network
+
+### topologies
+1. Bus topology
+2. Ring topology
+3. STAR topology
+4. TREE topology
+5. MESH topology
+
+## structure of network:
+
+## OSI model (Open System Interconnection Model)
+- OSI model is a layered model of computer networks.
+
+### layers of OSI model
+- physical layer
+- link layer
+- network layer
+- transport layer
+- session layer
+- presentation layer
+- application layer 
+
+there is a another model called TCP/IP model.
+a TCP/IP model is a layered model of computer networks.    
+
+### layers of TCP/IP model
+- physical layer
+- data link layer
+- network layer
+- transport layer
+- application layer
+
+### client server architecture
+The client-server model describes how a server provides resources and services to one or more clients. Examples of servers include web servers, mail servers, and file servers. Each of these servers provide resources to client devices, such as desktop computers, laptops, tablets, and smartphones.

Shubham-Yadav/02-linux/copy.txt

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+basic linux commands 
+
+cat >  new.txt
+

Shubham-Yadav/02-linux/linux.md

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+# Types of shells
+* Bourne shell (sh shell)
+* C shell (csh shell)
+* Z shell (zsh shell)
+* Bourne again shell (bash shell)
+
+# linux commands
+
+### basic commands
+1. `echo` - print a string
+2. `ls` - list files in a directory
+3. `cd` - change directory
+4. `pwd` - print working directory
+5. `mkdir` - make a directory
+6. `rmdir` - remove a directory
+7. `rm` - remove a file
+8. `cp` - copy a file
+9. `mv` - move a file
+10. `cat` - concatenate files and print on the standard output
+11. `grep` - search for a pattern in a file
+
+### User accounts
+1. `whoami` - print the name of the current user
+2. `id` - print the user ID of the current user
+3. `sudo` - run a command as root
+4. `su` - run a command as another user
+
+### Download files
+1. `curl <url>` - download a file from the internet
+2. `wget <url>` - download a file from the internet
+
+
+### Check OS version
+1. `uname -a` - print operating system information
+2. `lsb_release -a` - print operating system information
+
+# Package managers
+RPM: Red Hat Package Manager
+
+1. `rpm -i <package>` - install a package
+2. `rpm -e <package>` - remove a package
+3. `rpm -q <package>` - query a package
+
+YUM: Yum Package Manager
+1. `yum install <package>` - install a package
+2. `yum remove <package>` - remove a package
+3. `yum list <package>` - query a package
+4. `yum repolist` - list available repositories
+
+# Services
+1. `service <service> start` - start a service
+2. `systemctl start <service>` - start a service
+3. `systemctl stop <service>` - stop a service
+4. `systemctl status <service>` - check the status of a service
+5. `systemctl enable <service>` - enable a service to start at boot
+6. `systemctl disable <service>` - disable a service to start at boot
+
+
+# VI editor
+1. `vi <file>` - open a file in vi editor
+2. to switch to insert mode: `i`
+3. to switch to command mode: `esc`
+4. to switch to visual mode: `v`
+5. to switch to replace mode: `r`
+6. to delete a character: `x`
+7. to delete a line: `dd`
+8. to delete a word: `dw`
+9. to copy a line: `yy`
+10. to paste a line: `p`
+11. to save a file: `:wq`
+12. to quit vi: `:q`
+13. to quit vi without saving: `:wq!`
+14. to quit vi and exit: `:q!`
+
+# Networking
+1. `ifconfig` - print network interface configuration
+2. `route` - print routing table
+3. `netstat` - print network statistics
+4. `ping <host>` - send ICMP echo request to a host
+5. `traceroute <host>` - trace the route to a host
+6. `dig <host>` - query DNS information
+7. `nslookup <host>` - query DNS information
+8. `nmap <host>` - scan a network
+9. `ss` - print network statistics
+
+# Routing
+1. `route add -net <network> <gateway>` - add a route
+2. `route del -net <network>` - delete a route
+3. `route add -host <host> <gateway>` - add a route
+

Shubham-Yadav/03-Yaml/datatypes.yaml

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+# String variables
+myself: Kunal Kushwaha
+fruit: "apple"
+job: 'swe'
+
+bio: |
+hey my name is shubham.
+
+# write a single line in multiple lines
+message: >
+this will
+all be
+in one single line
+
+# same as
+message: !!str this will all be in one single line
+
+number: 5473
+marks: 98.76
+booleanValue: !!bool No # n, N, false, False, FALSE
+# same for true -> yes, y, Y
+
+# specify the type
+zero: !!int 0
+positiveNum: !!int 45
+negativeNum: !!int -45
+binaryNum: !!int 0b11001
+octalNum: !!int 06574
+hexa: !!int 0x45
+commaValue: !!int +540_000 # 540,000
+exponential numbers: 6.023E56
+
+# floating point numbers
+marks: !!float 56.89
+infinite: !!float .inf
+not a num: .nan
+
+# null
+surname: !!null Null # or null NULL ~
+~: this is a null key
+
+# dates and time
+date: !!timestamp 2002-12-14
+india time: 2001-12-15T02:59:43.10 +5:30
+no time zone: 2001-12-15T02:59:43.10

Shubham-Yadav/03-Yaml/kubernetes.yaml

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+apiversion: v1
+kind: pod
+metadata:
+  name: nginx
+  labels:
+    app: nginx
+spec:
+  containers:
+  - name: nginx
+    image: nginx:1.7.9
+    ports:
+    - containerPort: 80
+    volumeMounts:
+    - name: nginx-config
+      mountPath: /etc/nginx
+  volumes:
+  - name: nginx-config
+    configMap:
+      name: nginx-config
+      items:
+      - key: nginx.conf
+        path: nginx.conf
+      - key: nginx.conf
+        path: nginx.conf
+  - name: sidecar-config
+    configMap:
+      name: sidecar-config
+      image: curl:1.7.9
+      command: ["/bin/sh", "-c", "echo 'hello'"]

Shubham-Yadav/03-Yaml/list.yaml

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+microservice:
+  - app: user-authenication
+    port: 3000
+    version: 1.7
+    deployed: false
+
+micro:
+  - app: user-authenication
+    port: 3000
+    version: [1.7, 1.8]
+
+
+data:
+  - app: user-authenication
+    port: 3000
+    version: 1.7
+    deployed: yes
+  - app: cart
+    port: 3000
+    versions:
+      - 1.7
+      - 1.8
+      - 1.9
+

Shubham-Yadav/03-Yaml/object.yaml

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+microservice:
+  app: user-authenication
+  port: 3000
+  version: 1.7

Shubham-Yadav/03-Yaml/test.yaml

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+# comment here
+app: user-authenication
+port: 3000
+version: 1.7
+