https://github.com/iyashwantsaini/docker_master
All Basic Concepts of Docker
https://github.com/iyashwantsaini/docker_master
devops docker kubernetes
Last synced: 3 months ago
JSON representation
All Basic Concepts of Docker
- Host: GitHub
- URL: https://github.com/iyashwantsaini/docker_master
- Owner: iyashwantsaini
- License: mit
- Created: 2020-08-12T18:42:39.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2020-08-21T17:20:52.000Z (almost 5 years ago)
- Last Synced: 2025-01-16T22:29:48.017Z (5 months ago)
- Topics: devops, docker, kubernetes
- Language: JavaScript
- Homepage:
- Size: 9.77 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Docker
## Process & Resources
- Namespacing - Isolating resources per process.
- Control Groups (cgroup) - Limits amount of resources per process.
- These are available in linux os.
- Docker in windows runs in a linux image.
## General
- creation
- docker_file -> docker_client -> docker_server -> usable_image
- every linux process has 3 communication channels
- STDIN
- STDOUT
- STDERR
- some command processors
- bash
- powershell
- sh
- zsh
- unless specified containers don't share a file system
## Commands
### **docker create**
- used to create a container
```
> docker create
```
### **docker start**
- used to run a container
- no output is shown to terminal
```
> docker start
```
- run a container with output enabled
```
> docker start -a
```
### **docker run**
- used to create and run a container
- docker run = docker create + docker start
```
> docker run
```
Example -
```
> docker run busybox echo hi there
hi there
```
Mutation -
Shows files inside container
```
> docker run busybox ls
bin
dev
etc
home
proc
root
sys
tmp
usr
var
```
### **docker ps**
- list all running containers
```
> docker ps
```
- list all containers ever created
- each having an unique randomly generated name
```
> docker ps --all
05cc4dadee37 redis "docker-entrypoint.s…" 6 days ago Exited (255) 5 days ago 6379/tcp clever_swirles
d54908bc9243 busybox "sh" 6 days ago Exited (0) 6 days ago affectionate_almeida
16ae4d2b9369 hello-world "/hello" 8 days ago Exited (0) 8 days ago kind_engelbart
```
### **docker system prune**
- remove all stopped containers
```
> docker system prune
Deleted Containers:
4273eb44e33ed03d9f707bbd2853727d21a10f7f895c66da2059f26c41eb9008
4d4827c59e577df0ab0f2aa82838a7ca1601938eca58f25d0169c66514872cd0
```
### **docker logs**
- to print the last logs(outputs) of the stopped container
```
> docker logs
```
### **docker stop**
- stops a running container
- sends a command (SIGTERM) to container to stop
```
> docker stop
```
### **docker kill**
- kills a running container
- forcefully stop container immediately
```
> docker kill
```
### **docker exec**
- running another command inside a running container
- multi command containers
- "-it" = allows us to provide input to the container
- "-i" helps connect to STDIN channel
- "-t" helps connect to show nicely formatted output
```
> docker exec -it
```
Example -
```
> docker run redis
1:M 21 Aug 2020 11:34:04.074 * Ready to accept connections
(now in another terminal)
> docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
33c28af2289a redis "docker-entrypoint.s…" 5 minutes ago Up 5 minutes 6379/tcp inspiring_bohr
> docker exec -t 33c28af2289a redis-cli
127.0.0.1:6379>
```
Running Shell (Terminal) Inside Container -
```
> docker run redis
(now in another terminal)
> docker exec -t 33c28af2289a sh
# type_commands_here
```