Given how much easier it is to override the CMD, the recommendation is use CMD in your Dockerfile when you want the user of your image to have the flexibility to run whichever executable they . rhuss changed the title docker:build remove <none> container Remove old image if already exists when doing a docker:build Jun 29, 2016. In the case of PowerShell, it uses the cmdlet Remove-Item. xargs -r apt-mark manual ; apt-get purge -y--auto-remove-o APT::AutoRemove::RecommendsImportant = false; . Limitations You can use any Dockerfile instruction as the argument to an ONBUILD trigger with three exceptions: ONBUILD FROM - This isn't allowed as it would override the base image used for the build. It is a simple text file that consists of a set of instructions or commands that is executed by an automated build process in steps from top to bottom. The final step is to restore the test folder as we did in step 3. Other potential reasons for a shell script to show a "not found . 3. Configuration. You will need to rely on . Once compiled, these packages are superfluous and should be removed in order to reduce the image size. Container virtualization is therefore fundamentally based on images, the files available on the Docker Hub and used to create and initialize an application in a new Docker container. Use the Remote-Containers: Reopen in Container command from the Command Palette ( F1, Ctrl+Shift+P ). The Overflow Blog Design patterns for asynchronous API communication I am trying to COPY a file to my docker container, but it keeps telling me that the directory doesn't exist, even though it does. I. Stack Exchange Network Stack Exchange network consists of 181 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their . The Dockerfile is assumed to be in the current working directory when docker build is called to create an image. To manage the files in the multiple layers, Docker is using the copy on write strategy. The Dockerfile runs npm install itself to acquire the dependencies. The latest and recommended version of the Compose file format is defined by the Compose Specification.The Compose spec merges the legacy 2.x and 3.x versions, aggregating properties across these formats and is implemented by Compose 1.27.0+. So, in this article i will let you know how to check file exists or not then delete image or file from folder. FROM ubuntu:latest COPY . . To create a new tag for the image we built above, run the following command. React is stored in-line with the project under the web . . Run script # 3. Use load to load the image from a .tar file. If it exists, then it returns the Boolean value "true". Browse other questions tagged docker dockerfile docker-multi-stage-build or ask your own question. Example # Print "Get Certified. npm install takes the package.json and created package-lock.json ADD. If Dockerfile path is relative, it MUST be resolved from context path. It's not part of the Dockerfile or docker-compose.yml spec, it is only a cli option for the run command, so the answer is no. This repository has been archived by the owner. For Docker-compose we can use top-level volumes as we did in the previous section and make them available to more than one service. If unwanted files in context, adjust .dockerignore file and go back to step 2 cat <<EOF > Dockerfile.build-context FROM busybox COPY . Conquer your projects. Delete the old projectfiles.tar. Create a Dockerfile The most common scenario when creating Docker images is to pull an existing image from a registry (usually from Docker Hub) and specify the changes you want to make on the base image. Dockerfile is used to build Docker Images. Since the point of volumes is to exist independent from containers, when a container is removed, a volume is not automatically removed at the same time. Build your image 5. The syntax uses the -f (or --file) option to specify the Dockerfile to use, using a hyphen ( -) as filename to instruct Docker to read the Dockerfile from stdin: docker build [OPTIONS] -f- PATH To do so: Hash the file using cat filename.ext | base64 and copy the resulting hash (it may be very long, so take care). command Select random folder Pick Node.js (latest LTS) Open dockerfile Add USER node at end of dockerfile Run Remote-Containers: Rebuild Co. I n this tutorial, we are going to see how to check if file exists in a batch file by using IF EXIST condition. Create a working directory with some content for a web server: $ mkdir demo-httpd && cd demo-httpd && echo 'sample container' > index.html. Note that this tool cannot retrieve the files added into the image through COPY or . Copy-on-write is a strategy of sharing and copying files for maximum efficiency. Many of these "dev container definitions" use a Dockerfile, so select one of the following definitions as a . If a file or directory exists in a lower layer within the image, and another layer (including the writable layer) needs read access to it, it just uses the existing file. In Linux, we'd use the rm command to delete a file or directory. We work on the shared folder, and create a file newfile from within a temporary container. ERROR: Service 'ServiceName' failed to build: The command '/bin/sh -c dotnet restore "ProjectName.csproj"' returned a non-zero code: 1. Add the lines to install packages 4. For example, if you have a Dockerfile with a custom name that is recognized as a text file, you cannot associate it with the Dockerfile type. If you look at the directory structure above then my Dockerfile is present under the child-directory. The Dockerfile is at the heart of Docker. Deleting a File in PowerShell. We can use pretty much the same code as in step 3, but with src replaced by test: There are several ways to initialise volumes, with some subtle differences that are important to understand. Estimated reading time: 83 minutes. Mentioned below is the syntax of a Dockerfile: Syntax # comments command argument argument1. Remove container after run. Simply make a note of the last image ID output by the commit before each new FROM command. I'm creating a shared pipeline definition and I'd like to define things and run things only if the project the pipeline it's running is has specific variables set or if a file exists in the directory. We can use this key in the next step to access the .env. About Dockerfile instructions. You do not need to install Docker locally. However, to understand why it works, we need to understand the directory structure. as you can see the new image was created with tag latest while old was left in local registry. See the Dockerfile Best Practices guide for more information. Docker Copy is a directive or instruction that is used in a Dockerfile to copy files or directories from local machine to the container filesystem where the source is the local path and destination is the path in the container filesystem. COPY . When present check if an image exists using the provided name and tag. Use pull to pull the image from a registry. 1. If we can easily get the Dockerfile from the original provider, then we know the tricks and we can even modify the Dockerfile to fit our own needs. This means that . Summary. Docker Dockerfile Dockerfile Dockerfile Dockerfile Dockerfile Dockerfile $ docker logs [OPTIONS] CONTAINER. Add a RUN command to update the image and add any application and utilities: . /build-context WORKDIR /build-context CMD find . The syntax of the Docker logs command is -. $ docker build -f /path/to/a/Dockerfile . The rest of the Remote - Containers quick start applies as-is. It allows triggering the execution of commands found in this file. this command is used to set environment variables in the container. If the Associate with File Type actions is disabled, this probably means that the filename is registered as a pattern for current file type. FROM must be the first non-comment instruction in the Dockerfile. There's no need to copy in the local node_modules folder, as it's not used by the Dockerfile. You can use the -f flag with docker build to point to a Dockerfile anywhere in your file system. To remove the file type pattern, do the following: 3. docker cp lets you move files between your host and your Docker containers. Docker build is the Docker engine command that consumes a Dockerfile and triggers the image creation process. Copy to project folder where image is being built # 2. Now, it doesn't matter how many new projects we add or delete, we won't need to touch the Dockerfile. Is there a better way of doing this. You'll be asked to either select an existing Docker Compose file (if one exists), or pick a pre-defined container configuration from the vscode-dev-containers repository in a filterable list sorted based on your folder's contents. Example sharing web_data to app and app2: \parent-directory - test-file-1.py - child-directory (child directory with Dockerfile) - DockerFile - test-file-2.py. However, in that case, we can't override the command itself. Compose specification. It works with files and directories but lacks most of the advanced functionality in the shell-based cp command. You can have multiple tags for an image. Each image is defined by a Dockerfile, a configuration file containing all the commands that a user needs to execute to . Batch file contains a series of DOS (Disk Operating System) instructions. docker build -t "my_app" --secret id=my_env,src=.env . You can have multiple tags for an image. Tip. Get Ahead" Now, let's have a look at how to build a Docker image using a dockerfile. $ docker build -f /path/to/a/Dockerfile . docker rm ----force foo. Follow the quick start for the Remote - SSH extension to connect to a host and open a folder there. Step 1: Create a directory containing a dockerfile where you specify the instructions and a folder that you want to ignore (say ignore-this). Define the base image with FROM 3. a bit shorter I suppose, but your way is fine. You can check out my article on Jenkins's multibranch pipeline which uses declarative pipeline as code with Jenkinsfile approach. This topic will show you how to use Dockerfiles with Windows containers, understand their basic syntax, and what the most common Dockerfile instructions are. Let's take a look at a practical example of using a .dockerignore file. The final step is to delete the old projectfiles.tar after the build has finished. In the later case, build arguments can be specified, including an alternate Dockerfile location. As the container ran with the "root" user by default, we won't . Modify Dockerfile so that it mounts the secret In some cases images that were more than 1.5GB where reduced to less than 300MB. CMD mkdir /app WORKDIR /app COPY script.sh . This approach works, especially if the script file is large or complex. Docker Container Logs Command. Restore test folder hierarchy. Let's create a second tag for the image we built and take a look at its layers. Then you can remove one or more volumes with the docker volume rm command: List: docker volume ls; Remove: docker volume rm volume_name volume_name; Remove dangling volumes - Docker 1.9 and later. But when record will delete from database then it should be remove from folder too otherwise there are several useless images store. Get Ahead" Run echo "Get Certified. Use an docker remove container if exists VPS and get a dedicated environment with powerful processing, great storage options, snapshots, and up to 2 Gbps of unmetered bandwidth. The docker build command is used to build an image from the Dockerfile. If your goal is to erase all traces of a . Enjoy the results Understand image layering Image cache example Dangling images Dockerfile best practices Use local to make sure that the image is already available on the local docker daemon. Check if File Exists When checking if a file exists, the most commonly used FILE operators are -e and -f. I usually assume the Jenkins job has WORKSPACE as the directory for the source code to check. Dockerfile example Listing Docker images on your computer Let's create your first image 1. NOTE: You should take care to ensure that your wildcard doesn't pick up other files which you don't intend to copy. The reason for posting this Q&A is that sometimes certain software is required to compile software in a docker image. The docker tag command creates a new tag for an image. You should see list of files in build context # 4. Otherwise, it returns "false". COPY COPY <SRC> <DEST> it will copy the files and directories from the host machine to the container. It's possible to add small binary files (30KB or smaller) to your application during the build step using a combination of Base64 encoding and environment variables. There are several Dockerfile linters available, the most popular being Hadolint, short for Ha skell Do ckerfile lint er. As an absolute path prevent the Compose file to be portable, Compose implementation SHOULD warn user accordingly. In this case, the dockerfile simply pulls the Ubuntu Image from the repository and copy the build context. You can see the command above as: load the .env file and give it a key called my_env. 7 comments blueimp commented on May 30, 2018 completed on May 30, 2018 thaJeztah version/17.12 on May 30, 2018 blueimp mentioned this issue on May 30, 2018 Hadolint is available as a Docker image and you can lint with: docker run --rm -i hadolint/hadolint. For example, I have language specific yaml files, I'd like to include: - local: "languages/docker.yaml" when: exists . However, this command is functional only when you use the journald or json- file logging drivers. Use build to build the image from a Dockerfile. Docker builds images automatically by reading the instructions from the Dockerfile. I'd like to conditionally include a file based on some criteria. ADD is used to add files or directories and remote files from URL from source host filesystem to a destination in the . If file-which-may-exist is present, it will also be copied. If your Dockerfile is immaculate, you won't see any output and receive an exit code 0. One way is to write the file and have the Dockerfile copy the script over, the commands inside the Dockerfile: . Find me on Twitter Facebook I got it working by running: COPY Dockerfile another_file*. So you can also do this using Laravel File System and using core php function file_exists () and . 0 members found this post helpful. This ensures that the image is fully self-contained. I am writing a shell script to delete a file if it exists. Here we pass the file from step 1 to our Dockerfils as a secret. This one can be absolute or relative path. NOTE: if you're using something like docker on mac, you won't run into those permission issues, as the file sharing is done through NFS and your local files will have the right user. /usr/src/app Create the Dockerfile 2. build.path must be specified when this value is used. Each Docker image contains a file named Dockerfile with no extension. I had this issue when I was working with one of my project on my windows laptop and my directory structure looked like this -. This will block the executing user from modifying existing binaries or scripts, which could enable different attacks. Despite this, Docker will still include the node_modules folder in the default build context. We can specify multiple source paths and we need to use a relative path while specifying multiple sources. Spends his time traveling the world with a bag of kites. A Dockerfile contains instructions and arguments that define the contents and startup behavior of a Docker container. Specifying a file that exists with another that may exist is exactly the behavior I want. Pulling binaries into your Dockerfile using env vars. load_path must be specified when this value is used. By default, Test-Path will check if the specified element exists in the location described. Click here for more info. $ docker tag python-docker:latest python-docker:v1. docker rm -f. The final option for stopping a running container is to use the --force or -f flag in conjunction with the docker rm command. Copy link Collaborator . . #!/bin/bash # [ -x qi1.txt ] && rm qi1.txt if [ -f qi1.txt ] ; then rm qi1.txt fi. Starting another container from the same image will give you a clean slate, without the files you added with docker cp. it will create the directory. Create a folder and inside it create a file called " dockerfile " which we will edit in the next step.. FROM ubuntu COPY.. / RUN ls -la / To merge a local directory into a directory within an image, do this. It is a good practice to use both ENTRYPOINT and CMD instructions together in Dockerfile. Which gives a hierarchy like the following: 5. Installing conda in docker. Then we need to go to the miniconda installation page and choose one of the Linux installers for your python version.. We will need to create a new Dockerfile and decide which python version we will use. $ docker run -it --name [my_new_container] --volumes-from [another_container] [image:tag] [command] Note: --volumes-from makes sense if we are using just Docker. To build the image, provide a path value set to a directory containing a context and Dockerfile. If your build produces artifacts outside of the sources directory, specify $(Agent.BuildDirectory) to delete files from the build agent . The most commonly used base image when creating Docker images is Alpine because it is small and optimized to be run in RAM. It is now read-only. It is a Dockerfile best practice for every executable in a container to be owned by the root user, even if it is executed by a non-root user and should not be world-writable. The most direct way is declare a volume at run-time with the -v flag: For more information about the instructions Docker supports, see "Dockerfile reference" in the Docker documentation.Dockerfile instructions and overrides. If you leave it empty, the deletions are done from the root folder of the repository (same as if you had specified $(Build.SourcesDirectory)). It will not delete files already . The tag or digest values are optional. By default the image will be pulled from Docker Hub. In this article, I will use the Python 3.8 installer, which has the name Miniconda3-latest-Linux-x86_64.sh . Repro: Run Remote-Containers: Open folder in container. The semi-exception to this is a new named volume, which docker will initialize on first use to include the contents of the image at that location, before performing the mount. The Docker tag command creates a new tag for an image. One downside to this approach is there is another file maintain with the Dockerfile. mvn package dockerfile:build dockerfile:push. It is used to create our own Docker image and mostly we use aparent Docker image to build our own Docker image however, we can create a base image as well. Mounting this file to a different location is possible, but it will need to be in . This includes invalidating the cache for RUN instructions. Follow the instructions provided by Apache Superset for writing your own superset_config.py. Dockerfile is a simple text file that consists of instructions to build Docker images. FROM can appear multiple times within a single Dockerfile in order to create multiple images. Quite simply, volumes are directories (or files) that are outside of the default Union File System and exist as normal directories and files on the host filesystem. The default ENTRYPOINT can be similarly overridden but it requires the use of the --entrypoint flag: $ docker run --entrypoint hostname demo 075a2fa95ab7. Below you'll find my normal boilerplate Dockerfile. The Compose file is a YAML file defining services, networks, and volumes for a Docker application. Argument Description; SourceFolder Source Folder (Optional) Folder that contains the files you want to delete. The following illustrates the use of Docker Layer Caching in Semaphore 2.0 projects: The .semaphore/semaphore.yml file has two blocks blocks. We can use the Docker logs command to batch-retrieve the logs present during the execution of the containers. Therefore, if the init.sh file is not in the host folder ./dockerdata, the entrypoint will not be found. Let's see how you can install conda into a docker image. Tobin Bradley. Answer: Make sure that your Dockerfile is in the root of your project as well as your docker-compose.yml file for the settings below in the code section (see Dockerfile Settings) to work. Only the parameters for the CMD instruction can be overridden while executing Docker . In such cases, the executable is defined with ENTRYPOINT, while CMD specifies the default parameter. The first one creates a Docker image that is reused in the second blocks block using the --cache-from command line parameter. Install Docker on your SSH host. Let's create a second tag for the image we built and take a look at its layers. if the destination does not exist. Typically, docker rm is used to remove an already stopped container, but the use of the -f flag will cause it to first issue a SIGKILL. This location is included in the image's PYTHONPATH. - Containers for services defined in the Compose file - Networks defined in the networks section of the Compose file - The default network, if one is used . Note: The first encountered ADD instruction will invalidate the cache for all following instructions from the Dockerfile if the contents of have changed. This document will discuss the concept of container images and container image . The same image can create more containers. Place this file in a local directory and mount this directory to /etc/superset inside the container. The first step is to copy them all into the root directory again: COPY test/*/*.csproj ./. Some Docker instructions interact with GitHub Actions, and an action's metadata file can . I found the easiest way to always this is to always copy over the Dockerfile, which must exist. Start the Dockerfile with a FROM command to indicate the base image: $ echo 'FROM fedora:latest' >> Dockerfile. Step 1: Create a Directory to Copy.In this example, we will create a directory and a file which we will copy using the COPY command. $ docker tag node-docker:latest node-docker:v1. This is sort of optional - if the file already exists the next time you run your build script, tar will just overwrite the . COPY foo file-which-may-exist* /target Make sure foo exists, since COPY needs at least one valid source. If the image is not found or the force option is used, the image will either be pulled, built or loaded. If an ONBUILD instruction fails, Docker will cancel the build and it'll look like the FROM stage was the cause. The Dockerfile tells Docker how to build the image that will be used to make containers. The block named "Use previous image" simulates the case where a number of . To create a new tag for the image we've built above, run the following command. A designer, developer and writer. So, if I want to copy a Gemfile for Ruby projects or package.json for node projects, I would specify . Batch File To Check If File Exists The following example check if "filename.txt" exists: A key called my_env then my Dockerfile is present under the child-directory, short for skell! And volumes for a Docker container Open a folder there implementation should warn user.. Tag command creates a Docker image folder where image is defined with ENTRYPOINT while. A new tag for the image and add any application and utilities: image size one valid source create image... A host and Open a folder there and CMD instructions together in Dockerfile Reopen in container the use of Layer. Of sharing and copying files for maximum efficiency an absolute path prevent the Compose to! Overridden while executing Docker discuss the concept of container images and container image is there is another file maintain the... Always copy over the Dockerfile creates a Docker container build -t & quot ; -- secret id=my_env src=.env... Secret id=my_env, src=.env connect to a directory containing a context and Dockerfile to Dockerfils! So you can check out my article on Jenkins & # x27 ; s pipeline. Or package.json for node projects, I would specify if the specified element exists in the current working when. ( Disk Operating System ) instructions some criteria contains instructions and arguments that the! Options ] container any output and receive an exit code 0 shared,! The directory structure OPTIONS ] container from URL from source host filesystem to a containing. On the shared folder, and an action & # x27 ; ve built above, the..., these packages are superfluous and should be removed in order to reduce the image from the agent. But your way is fine and take a look at the directory structure returns & quot ; my_app quot... One downside to this approach is there is another file maintain with the & quot ; you... Specify multiple source paths and we need to use a relative path specifying! Is being built # 2 the test folder as we did in the multiple,! Init.Sh file is a strategy of sharing and copying files for maximum efficiency encountered add instruction invalidate! Folder./dockerdata, the executable is defined with ENTRYPOINT, while CMD specifies the parameter. The init.sh file is a strategy of sharing and copying files for maximum efficiency directory! Is there is another file maintain with the Dockerfile is assumed to be in the case where number! Syntax of a top-level volumes as we did in step 3 1.5GB reduced! Instructions and arguments that define the base image when creating Docker images on your computer let #... Copy-On-Write is a YAML file defining services, networks, and create a new tag for image... Script over, the commands inside the container parameters for the CMD can... To access the.env despite this, Docker will still include the node_modules folder in container xargs -r apt-mark ;. Which could enable different attacks context path most popular being Hadolint, short Ha. Present check if & quot ; false & quot ; not found or the force is... Should warn user accordingly is functional only when you use the Remote-Containers: Rebuild Co, it... Copy test/ * / *.csproj./ way is fine, src=.env traces of a Dockerfile and triggers the size. Gives a hierarchy like the following: 5 ll find my normal boilerplate.. The last image ID output by the commit before each new from command that tool... Contents of have changed Compose implementation should warn user accordingly folder ( Optional ) folder that contains the files want. And add any application and utilities:: syntax # comments command argument argument1 Test-Path will check if image. File from folder too otherwise there are several Dockerfile linters available, the Dockerfile Best Practices guide for information! Reduced to less than 300MB tag node-docker: latest node-docker: v1 based on some criteria directory when Docker is! Let & # x27 ; d like to conditionally include a file named Dockerfile with no extension file exists not! - containers quick start for the image from a.tar file commands found in file. Will not be found if you look at the directory structure will need to understand directory! That sometimes certain software is required to compile software in a Docker application add instruction invalidate! Script to show a & quot ; -- secret id=my_env, src=.env ( Disk Operating System instructions! ] container cache for all following instructions from the command Palette ( F1, Ctrl+Shift+P ) reused in Dockerfile! You added with Docker cp by reading the instructions provided by Apache Superset writing! Core php function file_exists ( ) and build an image exists using the cache-from... Let you know how to build the image from a Dockerfile, which has name. Docker is using the provided name and tag in dockerfile remove file if exists registry for Ruby projects or package.json for node projects I! Above as: load the image through copy or packages are superfluous and should be removed in to! Superfluous and should be removed in order to create a second tag for the image will be pulled Docker. Than one service the previous section and make them available to more than one service series DOS! Line parameter files you added with Docker cp a path value set to a host Open... And add any application and utilities: Dockerfile contains instructions and arguments that define base. Or package.json for node projects, I will let you know how to check if file exists the command! Connect to a destination in the second blocks block using the copy on strategy. $ Docker logs [ OPTIONS ] container ; false & quot ; use previous &. Include a file newfile from within a temporary container projects or package.json for node projects, I let! Not be found, build arguments can be specified when this value is used to build the image is... When record will delete from database then it should be remove from folder s PYTHONPATH was. Is there is another file maintain with the Dockerfile the world with a bag of.. Implementation should warn user accordingly Linux, we can use this key in the case! Folder as we did in step 3 delete the old projectfiles.tar after the build context 4! If & quot ; a local directory and mount this directory to /etc/superset inside the Dockerfile test/ * *. Then delete image or file from folder too otherwise there are several Dockerfile linters available the... Got it working by running: copy Dockerfile another_file * location is possible, but your is... File or directory image contains a series of DOS ( Disk Operating System ) instructions invalidate cache... ; t see any output and receive an exit code 0 discuss the concept of container images and container.! And created package-lock.json add: load the image is not found file has blocks. Docker tag command creates a new tag for the image we & # x27 ; s file. That it mounts the secret in some cases images that were more than 1.5GB where reduced to less than.! Our Dockerfils as a dockerfile remove file if exists restore the test folder as we did in the case where a number.! Directories and Remote files from the Dockerfile stored in-line with the & quot ; work on the shared folder and! Any application and utilities: advanced dockerfile remove file if exists in the next step to access.env. ; ll find my normal boilerplate Dockerfile final step is to write the file from folder use Docker... Dockerfile simply pulls the Ubuntu image from a registry tag latest while old was left in local registry the! Image with from 3. a bit shorter I suppose, but it also... Rm command to batch-retrieve the logs present during the execution of the advanced in. Case where a number of directories but lacks most of the Remote - SSH extension connect... In Linux, we need to understand the directory structure above then my Dockerfile is present under the child-directory networks... It allows triggering the execution of commands found in this article I will use the Python 3.8,... Got it working by running: copy test/ * / *.csproj./ also Do this Laravel. Your Dockerfile is assumed to be in layers, Docker will still include node_modules... Will delete from database then it should be removed in order to reduce the image copy. Of PowerShell, it returns & quot ; filename.txt & quot ; images is Alpine because it a. Will discuss the concept of container images and container image Actions, and an action & # x27 ; create... Build agent we pass the file from folder and an action & # x27 ; t see any output receive. Traveling the world with a bag of kites copy or journald or json- logging... Is being built # 2 this key in the default build context # 4 questions. Ubuntu image from the repository and copy the build context will still the... Id=My_Env, src=.env existing binaries or scripts, which could enable different.... Repro: run Remote-Containers: Open folder in container appear multiple times within a temporary container start for the,. In some cases images that were more than one service no extension load_path must be resolved context... Will also be copied and Remote files from the same image will give you a clean slate, without files. Can specify multiple source paths and we need to be run in.! My article on Jenkins & # x27 ; d like to conditionally include a file named Dockerfile with extension! The node_modules folder in container command from the Dockerfile if the init.sh file large... This tool can not retrieve the files you want to copy a Gemfile for Ruby projects or package.json node. Is required to compile software in a Docker image that is reused in the second blocks using! Triggers the image is defined by a Dockerfile: image creation process LTS ) Dockerfile!
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