#Container image tool apk#
Note : apk add commands should have –no-cache added.ĥ.
#Container image tool install#
USE –no-install-recommends ON apt-get installĪdding - no-install-recommends to apt-get install -y can help dramatically reduce the size by avoiding installing packages that aren’t technically dependencies but are recommended to be installed alongside packages. Note: Using this method, you will need to rebuild the entire image each time you add a new package to install.Ĥ. Try to install all the packages on a single RUN command to reduce the number of steps in the build process and reduce the size of the image. Otherwise, this may cause each step in the build process to increase the size of the image. Try to minimize the number of layers to install the packages in the Dockerfile. Note: It is recommended that install these tools only in the development Dockerfile and remove it once the development is completed and is ready for deployment to staging or production environments. The image size will further increase because of these debugging tools. Many developers will use the curl/vim tools inside the Dockerfiles for later debugging purposes inside the container. DON’T INSTALL DEBUG TOOLS LIKE curl/vim/nano Identify the ones you really need and install only those.įor example, by considering an alpine base image, the size of the image will get reduced to 5MB from 128MB.Ģ. Realize that you probably don’t need many of those libraries that you are installing. For each apt-get installer or yum install line you add in your Dockerfile, you will be increasing the image size based on the size of the library is added.
The above command will set your image size to 128MB at the outset.
Here are some basic steps recommended to follow, which will help create smaller and more efficient Docker images. Avoiding large images speed up the build and deployment of containers and hence, it is critical to reducing the image size of images to a minimum. When building a Docker image, you may want to make sure to keep it light. Docker images are created by writing Dockerfiles – lists of instructions automatically executed for creating a specific Docker image. A Docker image serves as the base of a container. Although closely related, there are major differences between containers and Docker images. In this article, we will review several techniques to reduce Docker image size without sacrificing developers’ and ops’ convenience.ĭocker images are an essential component for building Docker containers.
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