Docker 6

 Let us revise the previous sessions once again. 

root@ip-172-31-15-245:~# docker images

REPOSITORY    TAG       IMAGE ID       CREATED        SIZE

nginx         latest    c20060033e06   2 weeks ago    187MB

ubuntu        18.04     f9a80a55f492   5 months ago   63.2MB

hello-world   latest    9c7a54a9a43c   6 months ago   13.3kB

root@ip-172-31-15-245:~# docker pull alpine

Using default tag: latest

latest: Pulling from library/alpine

96526aa774ef: Pull complete

Digest: sha256:eece025e432126ce23f223450a0326fbebde39cdf496a85d8c016293fc851978

Status: Downloaded newer image for alpine:latest

docker.io/library/alpine:latest

root@ip-172-31-15-245:~# docker images

REPOSITORY    TAG       IMAGE ID       CREATED        SIZE

nginx         latest    c20060033e06   2 weeks ago    187MB

alpine        latest    8ca4688f4f35   7 weeks ago    7.34MB

ubuntu        18.04     f9a80a55f492   5 months ago   63.2MB

hello-world   latest    9c7a54a9a43c   6 months ago   13.3kB

root@ip-172-31-15-245:~#

To check what all the containers are running, then we use the below command

docker ps or docker container ls

docker ps -a

Assume that in case if i want to run the container busy box. then i go with the below command

root@ip-172-31-15-245:~# docker run busybox:latest

root@ip-172-31-15-245:~#

In the above screenshot, we can see that we have not assign any names to it. But we can assign own name by using the below command

 docker run --name con1 busybox:latest sh

From ,  the above screen shot you can see that i have defined the name as con1.

If you want to stop then you can use the below command

root@ip-172-31-15-245:~# docker stop con2

con2

Difference between pull and run and run command

When we run single command, it will check if that image is available or not locally.  If not available it will go and pull the image and then download and run.

 docker run -dit --name test123 ubunto:18.04, to give name  you need to run this command.

This, time i am not going to using the pull command. I am going to use the Run Command.

I am going to Run the different Image that is nginx.

docker run -idt --name abc123 -p 80:80 nginx-->If the image is not available

then it goes and pulls that image. 

If available locally, then it wont pull that image

If we want to stop any one of the container, then i can go with the below command

docker stop test123

If i go with docker info command

Total no of containers created stopped and running 

root@ip-172-31-15-245:~# docker ps

CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS                               NAMES

6466490db8e3   nginx     "/docker-entrypoint.…"   13 minutes ago   Up 13 minutes   0.0.0.0:80->80/tcp, :::80->80/tcp   abc123

root@ip-172-31-15-245:~#

Here, you can see the port no is 80

Now, i want to run the above container outside using port Number.

Get the ip address by running the below command

root@ip-172-31-15-245:~# hostname -i

Now, we need to login into the AWS Account, which we created , and browse with the public ip address

In the AWS Account, you can see the below screen

Never Expose private IPto others, than people might krack and hack it

Now click on the security Group Link as shown below

Now, click on the Edit the Inbound Rules

Go at the bottom and add the new port Number

Now, browse the url with the public address and give the port name as 80 to it.

Now, i am going to stop that with the container id by using the below command

docker stop 6466490db8e3

Now, if i go and browse the nginx home page. 

I will get an error page saying that this site cant be reached. Because that is stop you wont be able o browse it

Now, i am going to start it again by using the below command

root@ip-172-31-15-245:~# docker start abc123

abc123

Now, again you browse the nginx page, you will be able to load it

Now, i want to check the memory of the container. For that we have a command call as 

docker stats

You can give the container id or name 

docker stats abc123 

or

docker stats containerid

Once we run docker stats cmd, we can see the cpu usage, memory and other things

 We can also restart the container by using the below command

docker restart container id or name

root@ip-172-31-15-245:~# docker restart abc123

abc123

root@ip-172-31-15-245:~#

To remove the container we basically use linux cmd that is 

docker rm name or container id

First we need to stop it before deleting it. 

To remove image use the below command 

docker rmi name or id

Now, i want to go to the folder path. 
use the below cmdls will list out all the folder inside that folder

cat is the linux command used to open the file. Now, I am going to open the repostiores.json file