DevopswithDinesh

 

DevopswithDinesh

Docker Commands 

docker info: It will give status of weather docker is running or not  and also It will display the detailed information about docker engine. 

docker version: Show the Docker version information.

docker images (OR) docker image ls : List all images that are locally stored with the Docker engine.

docker run <<Docker Image>> : It will run the docker image.

Example: docker run hello-world: This command will download the hello-world image, if it is not already present, and run the hello-world as a container.

docker images <<Image Name>>: It will display the information about image.

docker images -q: It will display only the images IDs.

docker rmi << Image ID/Image Name>> (OR) docker image rm << Image ID/Image Name>>: It will delete an image from the local image store.
Example: docker rmi nginx

docker rmi $(docker images -q) (OR) docker rmi -f $(docker images -q) : It will remove all the images from docker engine.

docker run --name “hello-world-container” helloworld: Start the hello-world image with “hello- world-container” container name. 

docker create “hello-world-cont” helloworld : It will create a container called “hello-world-cont” from the image hello-world and it won’t start the container.

docker ps (OR) docker container ls: Lists running containers
(It will not display the stopped containers)

docker ps –a (OR) docker container ls --all (OR) docker container -a: Lists all containers (It will display the stopped containers along with running containers.)
                                                    
docker start <Container name|id>: It will start the container.

docker start webserver: It will start the webserver.

docker stop <container name|id> (OR) docker container stop <container name|id>: It will stop the docker container.

docker stop webserver: It will stop the container called webserver.

docker pause CID/CNAME: It will pause the container.

docker unpause CID/CNAME: It will unpause the container.

Docker Container status are, created, restarting, running, removing, paused, exited, or dead

docker ps -a --filter "name=mithun16thjune": It will display all the containers with name mithun16thjune name.

docker ps -a --filter 'exited=0' :

docker ps --filter status=running: It will display the all the running state containers.

docker ps --filter status=paused: It will display the all the paused state containers.

docker logs <container name>: It will display the logs for that container.

docker logs --tail 100 <<Container Name>>: Print the last 100 lines of a container’s logs.

docker top <<Container ID>>: This will shows the top processes in within in a container.

docker reanme <<Container Old Name>> <<Container New Name>>: It will rename the conatiner.

docker rm -f <<Container Name>>: It will remove the container.

docker rm -f webserver: It will stop and remove the running container with a single command.

docker stop $(docker ps -a -q): It will stop all the containers.

docker rm -f $(docker ps -aq): Delete all running and stopped containers.

docker kill <<CID/C Name>>: It will kill the container.

docker container prune: It will delete all stopped containers.

docker search <<Image Name>>: It will search all of the publicly available images on Docker
Hub(https://hub.docker.com).

docker pull <<Image Name>: Pull an image from Docker Hub

docker inspect <<CID>> : It will give information for container.

docker attach <<CID>> : It will connect to running container.

docker exec <<CID>> : Run a linux command in a running container.

docker stats <<CID>> : It will display a live stream of container resource usage statics.

docker network ls: List the networks.

docker network create mithuntechnologies : It will create the network with name called as mithuntechnologies.

docker network inspect bridge: Display detailed information on one or more networks.

docker network connect: Connect a container to a network.

docker network prune: Remove all unused networks.

docker run -it -v /Users/mithunreddyl/Desktop/dockervolumes:/mithuntechnoVol1 ubuntu : Create a container with volume mithuntechnoVol1.


docker run -it -v /Users/mithunreddyl/Desktop/dockervolumes:/mithuntechnoVol1:ro --name ubuntucontainer16 ubuntu : Create the Read only Volume.


docker run -it --volumes-from ubuntucontainer16 --name ubuntucontainer1604 ubuntu:16.04:
Create a container ubuntucontainer1604 that uses the same volumes as ubuntucontainer16

Can I mount same volume to multiple docker containers?
Ans) Yes you can add same location as a volume to many docker containers.

docker login: To sign into the Docker Hub.

docker logout: To logout from the Docker Hub. If no server is specified, then the default is used.

Thursday, January 16, 2020

Install Docker in Linux Server - 

                                                

In Ubuntu Server

----------------------

Method-1
=======

Step 1: Update all Software Repositories using below command.

#sudo apt-get update

Step 2: Install a Docker using below command

#sudo apt install docker.io -y

Step 3: Enable and start the docker service as follows.

#sudo systemctl enable docker
#sudo systemctl start docker

Step 4: Check the  docker version

#docker --version

# You will get permison denied error as regular user dosn't have permisions to execute docker commands, add ubuntu user to docker group.

#sudo usermod -aG docker $USER
     or 

#sudo usermod -aG docker ubuntu

# Exit From Current SSH Terminal & SSH(Login) again .Then execute
docker ps

To Un Install a docker
-----------------------------
Use below command to un-install docker
#apt-get remove docker docker-engine docker.io -y
----------------------------------------------------------------------------------------------------------------------------
Method -2
========
Step 1: Update all Software Repositories using below command.
#apt-get update


Step 2: Install Docker using below command
#curl -fsSL get.docker.com | /bin/bash


Step 3: Check all the versions.
#apt-cache madison docker-ce


Step 4: If we want to install the specific version use the below command.
apt-get install docker-ce=<VERSION>

Step 5: If you would like to use Docker as a non-root user, you should now consider
adding your user to the "docker" group with something like:

#usermod -aG docker  <<YourUser>>
============================================================================

 In Amazon Linux
-----------------------
sudo yum update -y       
sudo yum install docker -y
sudo service docker start

Add Regural user to dockergroup
sudo usermod -aG docker  <username>

ex:
sudo usermod -aG docker ec2-user

Once you add user to group exit from the server and login again.
# Get docker information
docker info

#Install Docker in Linux (Works for most of linux flavors).
sudo curl -fsSL get.docker.com | /bin/bash

Docker Home Directory/Working Dir:
/var/lib/docker

============================================================================

Install Docker on AWS RHEL  (Offcially No Support)
----------------------------------------------------------------------
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo dnf install docker-ce-3:18.09.1-3.el7 -y
sudo systemctl enable docker
sudo systemctl start docker

sudo docker info

# Check docker is installed or not
docker info

# You will get permison denied error as regular user dosn't have permisions to execute docker commands, add user to docker group.

sudo usermod -aG docker $USER
or
sudo usermod -aG docker ec2-user

# Exit From Current SSH Terminal & SSH(Login) again .Then execute
docker ps