SSH login with ED25519 keys

To generate new key pairs

ssh-keygen -t ed25519 -f /root/.ssh/id_ed25519 -C "root@linuxwin" -N ""

Empty files if needed 

echo "" > /root/.ssh/authorized_keys
echo "" > /root/.ssh/known_hosts

Add public key to Authorized_keys

cat /root/.ssh/id_ed25519.pub >> /root/.ssh/authorized_keys
chmod 600 /root/.ssh/authorized_keys

Set permissions 

chmod 700 /root/.ssh
chmod 600 /root/.ssh/authorized_keys
chmod 644 /root/.ssh/known_hosts
chown -R root:root /root/.ssh

Copy private key to ssh client

cat /root/.ssh/id_ed25519

### copy everything from
-----BEGIN OPENSSH PRIVATE KEY-----
    ...... until .....
 -----END OPENSSH PRIVATE KEY-----

Docker CLI

docker pull <image_name>pulls image from repo
docker run image_name:9.6download and run with spec.version, run creates container from image. start just start it
docker pslist all runninig containers
docker imageslist all mages
docker run -d <image_name>run in detached mode (background)
docker stop <container-ID>stops container
docker start <container-ID>restarts container
docker ps -alist all (running and not running)
docker run -p5000:3180port binding HOST_port:CONTAINER_port
docker logs <container_ID>display logs
docker run –name <some_name> <image_name>give name to a container
docker exec -it <container_id> /bin/bashget terminal of continer (env for enviroments)
/bin/sh in case there is no /bin/bash
docker network lsinternal docker network list
docker network create <network_name>create new network inside docker
docker run -p 27017:27017 -d \
-e MONGO_INITDB_ROOT_USERNAME=admin \
-e MOONGO_INITDB_ROOT_PASSWORD=passw \
–name mongodb \
–net mongo-network \
mongo		start mongodb, set ports, set network, set credentials.
docker run -d \
-p 8081:8081 \
-e ME_CONFIG_MONGODB_ADMINUSERNAME=admin \
-e ME_CONFIG_MONGODB_ADMINPASSWORD=passw \
–net mongo-network \
–name mongo-express \
-e ME_CONFIG_MONGODB_SERVER=mongodb \
mongo-express		connect mongo UI, to mongoDB
docker-compose -f <yaml_file> uprun containers with yaml config file
docker-compose -f <yaml_file> downshutdown containers and network
### Docker compose ###
### .yaml file example ###

version: '3'     ### docker compose version
services:
  mongodb:
    image: mongo
    ports:
     - 27017:27017
    environment:
     - MONGO_INITDB_ROOT_USERNAME=admin
     - MONGO_INITDB_ROOT_PASSWORD=passw
  mongo-express:
    image: mongo-express
    ports:
     - 8080:8081
    environment:
     - ME_CONFIG_MONGODB_ADMINUSERNAME=admin
     - ME_CONFIG_MONGODB_ADMINPASSWORD=passw
     - ME_CONFIG_MONGODB_SERVER=mongodb
### Dockerfile - Build image file ### filename has to be Dockerfile

FROM <image>                      ### usually some linux distro or app or...###
ENV MONGO_DB_USERNAME=admin \     ### or some other app credentials###
    MONGO_DB_PASSWORD=passw       ### optional, to avoid to change .yaml
RUN mkdir -p /home/app            ### execute linux command inside container
                                  ### it will make dir inside container
COPY . /home/app                  ### copy content from host to container
CMD ["node"."/home/app/server.js"] ### or whatever has to be started inside
                                  ### -- entry point command


docker build -t <app-image-name:ver_xx> .
### Dockerfile must exist in the current dir ###
docker rm <container_id>remove container
docker rmi <image_id>delete image
### Private repository (docker registry) ###
### Create private repository on AWS ### (repo per image)

docker login ###copy command from repo provider (AWS)
### AWS cli must be installed and credentials configured

###image naming in docker registry
   registryDOMAIN/imageName:tag

### rename image
docker tag myAPP:1.0 domain/myAPP:10

### push to repo
docker push domain/myAPP:10
docker run -v /home/myapp/mysql:/var/lib/mysql/datamount volume host:container
(host volumes)
docker run -v /var/lib/mysql/datadocker will chose where to mount
/var/lib/docker/volumes/random_hash/_data
(anonymus volume)
docker run -v name:/var/lib/mysql/datanamed volumes. like anonymus but
you can reference volume by name
(mostly used)
version: '3'     ### docker compose version
services:
  mongodb:
    image: mongo
    ports:
     - 27017:27017
    volumes:
     - data-db:/var/lib/mysql/data     #### named volume
#####################
    some other config
#####################

                     ### you have to list all volumes at the end
volumes:             ### at services level
  data-db:           ### multiple containers can use one volume
    driver: local
### docker volumes locations ###

C:\ProgramData\docker\volumes\    ### Win

/var/lib/docker/volumes/           ### Linux

/var/lib/docker/volumes/           ### OSX
### docker for mac creates linux VM
screen ~/Library/Containers/com.docker.docker/data/com.docker.docker.driver.amd64-linux/tty

### to get terminal of linuxVM on OSX ###

### Ctrl+a+k for exit ###
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