Top 9 basic commands of Docker
Hello users, In this article we are going to see top basic commands of Docker.
If you not yet read my previous article i recommend you to read that ( click here to read) .
* In this article we are going to use ubuntu system.
* open terminal ( I assume that you already install docker if not please visit my previous article )
1. docker pull ImageName : using this command we can pull any image file from docker hub , eg. " docker pull ubuntu ": this will pull the docker image file and saved it to your local repo.
2. docker images : this command will show all downloaded images .
# in above image if you notice that after this the command we get a terminal for our docker ubuntu image file, so here i created a folder " ourFirstRunningCountainer ".
# now, leave this terminal as it and open a new terminal. ( when i will say new terminal in upcoming commands means i am taking about this terminal )
4. type this command in our new terminal " docker ps -a " : this list all container with there stages.
# so above image show our container details , we got a container ID which is unique for all container and a status which is showing " UP " that's means our container is running/active.
# in old terminal type exit and after this type " docker ps -a " in new terminal,
now we exited the running container and if we check the status we will get Exited
# so our created container will exist permanently until we remove them.
# so all command work well if you are doing this first time, now let assume you shut down your system and in next day if you want to run the same container which is previously created .
#so first close both the terminal.
# now open terminal.
# so here we will not use "docker run -it ImageName" because this command will create a new container every time.
# first type " docker ps -a " to check existed container and copy the returned container ID and notice what is the status.
# now open a second terminal and type " docker start ContainerID ", eg. " docker start a976c3ba0030 ": this will start the container .
# now go back to first terminal and check the container status by typing " docker ps -a ", we will get " UP " value for status.
# here our container is started , now if we want to work with this container follow next command.
6. go back to first terminal and type " docker exec -it ContainerID bash "
eg. ' sudo docker exec -it a976c3ba0030 bash ' : this command provide the interactive terminal for given container , so this the same container which is created at the beginning of the article so if we navigate to our created folder ( ourFirstRunningCountainer ) we will get the folder,
# so a container can save our data even if we shutdown our system.
# now exit this container and let check the status of container
# here it still showing UP , the reason is that we start the container using this " docker start ContainerID ", so we need to stop after after exiting the container.
7. docker stop ContainerID : eg. docker stop a976c3ba0030 ,
this will stop the container , now again check the status....., here we got Exited.
# so here , we are now familiar with pulling images, create and run new container using image, start/stop existed container , so this command are enough to get started with docker .
# more commands, now we look some more useful commands
# close all terminal open a new terminal and type " docker ps -a " to see the containers .
8. type : " docker rm ContainerID " : this remove the given container
eg. docker rm a976c3ba0030 , after this again run " docker ps -a" , we will get nothing,because no container exist.
# remove image file: first check the existing images " docker images ".
9. type : " docker rmi ImageName " eg. docker rmi ubuntu
this will remove the given image from your local repo.
# again type " docker images " : to see available images, in our case it will show nothing.
* all done. so this are the top 9 basic commands of docker , in our future article we will go through some advance commands of docker.
Thanks for reading this.
If you not yet read my previous article i recommend you to read that ( click here to read) .
* In this article we are going to use ubuntu system.
* open terminal ( I assume that you already install docker if not please visit my previous article )
1. docker pull ImageName : using this command we can pull any image file from docker hub , eg. " docker pull ubuntu ": this will pull the docker image file and saved it to your local repo.
2. docker images : this command will show all downloaded images .
# Note : we can create any number of container using a single image file .
3. docker run -it ImageName : This command will run your image file and create a running container, here -it is combination of two flags -i and -t , -i is stand for interactive and -t is for terminal. eg. " docker run -it ubuntu " now you can do anything with this container.
# in above image if you notice that after this the command we get a terminal for our docker ubuntu image file, so here i created a folder " ourFirstRunningCountainer ".
# now, leave this terminal as it and open a new terminal. ( when i will say new terminal in upcoming commands means i am taking about this terminal )
4. type this command in our new terminal " docker ps -a " : this list all container with there stages.
# so above image show our container details , we got a container ID which is unique for all container and a status which is showing " UP " that's means our container is running/active.
# in old terminal type exit and after this type " docker ps -a " in new terminal,
now we exited the running container and if we check the status we will get Exited
# so our created container will exist permanently until we remove them.
# so all command work well if you are doing this first time, now let assume you shut down your system and in next day if you want to run the same container which is previously created .
#so first close both the terminal.
# now open terminal.
# so here we will not use "docker run -it ImageName" because this command will create a new container every time.
# first type " docker ps -a " to check existed container and copy the returned container ID and notice what is the status.
# now open a second terminal and type " docker start ContainerID ", eg. " docker start a976c3ba0030 ": this will start the container .
# now go back to first terminal and check the container status by typing " docker ps -a ", we will get " UP " value for status.
# here our container is started , now if we want to work with this container follow next command.
6. go back to first terminal and type " docker exec -it ContainerID bash "
eg. ' sudo docker exec -it a976c3ba0030 bash ' : this command provide the interactive terminal for given container , so this the same container which is created at the beginning of the article so if we navigate to our created folder ( ourFirstRunningCountainer ) we will get the folder,
# so a container can save our data even if we shutdown our system.
# now exit this container and let check the status of container
# here it still showing UP , the reason is that we start the container using this " docker start ContainerID ", so we need to stop after after exiting the container.
7. docker stop ContainerID : eg. docker stop a976c3ba0030 ,
this will stop the container , now again check the status....., here we got Exited.
# so here , we are now familiar with pulling images, create and run new container using image, start/stop existed container , so this command are enough to get started with docker .
# more commands, now we look some more useful commands
# close all terminal open a new terminal and type " docker ps -a " to see the containers .
8. type : " docker rm ContainerID " : this remove the given container
eg. docker rm a976c3ba0030 , after this again run " docker ps -a" , we will get nothing,because no container exist.
# remove image file: first check the existing images " docker images ".
9. type : " docker rmi ImageName " eg. docker rmi ubuntu
this will remove the given image from your local repo.
# again type " docker images " : to see available images, in our case it will show nothing.
* all done. so this are the top 9 basic commands of docker , in our future article we will go through some advance commands of docker.
Thanks for reading this.
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