How To Install In Docker Container

Following the previous Docker commodity, this tutorial will hash out how to save a Docker container into a new prototype, remove a container, and run an Nginx web server inside a container.

Requirements

• How to Install Docker and Run Containers in CentOS/RHEL 8/vii – Role 1

How To Run and Save a Docker Container

ane. In this instance, we will run and save an Ubuntu-based Docker container where the Nginx server will be installed. Simply earlier committing any changes to a container, first start the container with the below commands which updates and installs Nginx daemon into Ubuntu image:

# docker run ubuntu bash -c "apt-get -y update"  # docker run ubuntu bash -c "apt-get -y install nginx"        

Install Nginx on Ubuntu Docker Container

If you lot get error 'East: Unable to locate packet nginx', then you lot need to connect to a container with interactive CLI and install nginx as shown.

# docker run -it ubuntu fustigate # apt install nginx # exit        

2. Next, later Nginx package is installed, effect the control docker ps -50 to get the ID or name of the running container.

# docker ps -l        

Find Docker Container ID Proper name

And utilize changes by running the beneath command:

# docker commit 5976e4ae287c ubuntu-nginx        

Here, 5976e4ae287c represents the container ID and ubuntu-nginx represents the name of the new image that has been saved with committed changes.

In club to view if the new epitome has been successfully created just run docker images control and a list of all saved images will exist shown.

# docker images        

Docker Container Changes

Chances are that the installation process inside the container finishes fast which leads to a not-running container (container is stopped). In this example the docker ps command won't bear witness whatsoever output because no container is running.

In order to be able to still go the container's id run docker ps -a | head -iii to output the most recent containers and identify the container based on the control issued to create the container and the exited status.

three. Alternatively, you can actively enter container sessions by running docker run -it ubuntu bash command and execute the further apt-get install nginx command. While the command is running, detach from the container using Ctrl-p + Ctrl-q keys and the container will continue running even if the Nginx installation process finishes.

# docker run -it ubuntu bash # apt-get install nginx        

Install Nginx on Docker Container

And then, go the running container id with docker ps and commit changes. When finished, re-enter to container console using docker attach and type exit to cease the container.

# docker ps # docker attach 3378689f2069 # get out        

Adhere Docker Container

4. To further test if the recent prototype has been committed properly (in this example Nginx service has been installed), execute the below command in club to generate a new container which will output if Nginx binary was successfully installed:

# docker run ubuntu-nginx whereis nginx        

Generate New Docker Container

5. To remove a container use the rm command confronting a container ID or name, which can be obtained using docker ps -a command:

# docker ps -a # sudo docker rm 36488523933a        

Remove Docker Container

How to Run Nginx inside Docker Container

half dozen. In this part nosotros will concentrate on how you tin can run and access a network service, such as an Nginx spider web server, inside Docker, using the ubuntu-nginx paradigm created earlier where the Nginx daemon was installed.

The offset thing that you need to do is to create a new container, map host-container ports, and enter container trounce by issuing the below command:

# docker run -it -p 81:fourscore ubuntu-nginx /bin/bash # nginx &        

Here, the -p selection exposes the host port to the container port. While the host port tin can exist capricious, with the condition that it should be available (no other host services should listen on it), the container port must be exactly the port that the within daemon is listening to.

Once yous're connected to container session, starting time Nginx daemon in the background and disassemble from container console by pressing Ctrl-p + Ctrl-q keys.

Run Nginx Inside Docker Container

vii. Now, run docker ps to get the state of your running container. You can besides view host network sockets by issuing the post-obit command:

# docker ps OR # netstat -tlpn        

View Docker Container Running Country

eight. In order to visit the page served by the Nginx container, open a browser from a remote location in your LAN and blazon the IP accost of your automobile using the HTTP protocol.

Verify Nginx Running nether Docker Container

9. To terminate the container run the following command followed past container ID or name:

# docker ps # docker terminate fervent_mccarthy # docker ps        

End Running Docker Container

Equally an alternative to stop the running container, enter container beat out command prompt and type exit to cease procedure:

# docker attach fervent_mccarthy # exit        

Exist enlightened that using this kind of container to run web servers or other kinds of services are best suited only for development purposes or tests due to the fact that the services are only active while the container is running. Exiting the container disrupts all running services or any changes made.

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Source: https://www.tecmint.com/install-run-and-delete-applications-inside-docker-containers/

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