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Introduction Executing a script upon container termination is the process of running a script or command when a Docker container is stopped or removed. This can be useful in a variety of scenarios, such as cleaning up resources, logging information, or triggering other actions. Container termination refers to the process of stopping or removing a Docker container. This can be done manually using the docker stop or docker rm commands, or automatically through the use of container orchestration tools or container lifecycle management features. Example 1: ONBUILD To execute a script upon container termination using the ONBUILD Dockerfile command, follow ... Read More
Introduction When building a Docker image, one of the most time-consuming and resource-intensive steps is running the "RUN npm install" instruction. This instruction installs all the dependencies listed in your package.json file. Caching the results of this instruction can greatly improve the build time of your image. In this article, we will explore different strategies for caching the "RUN npm install" instruction in a Dockerfile. Caching Strategies There are several strategies for caching the "RUN npm install" instruction in a Dockerfile. These include − Using a .dockerignore file − This strategy involves excluding the node_modules directory from being copied ... Read More
Introduction Docker containers are a popular way to package and deploy applications. One of the key features of containerization is the ability to isolate resources and limit their usage. In terms of CPU, it is important to know how many CPUs a container can use, as this can greatly impact the performance of the application running inside the container. This article will cover the concepts of CPU resource allocation in Docker, determining the number of CPU available to a container, configuring CPU resources for a container, and advanced techniques for managing CPU resources. Understanding these concepts will help ensure that ... Read More
Introduction Using variables in a Dockerfile CMD can greatly improve the flexibility and maintainability of container configuration. Hardcoding values in a CMD instruction can make it difficult to update or modify the container's configuration in the future. Using variables allows for more dynamic and reusable configurations. Prerequisites The prerequisites for using variables inside a Dockerfile CMD depend on the method you choose to use − Using shell expansion − No specific prerequisites are required. Using the ENV instruction − No specific prerequisites are required. Using the ARG instruction − No specific prerequisites are required. Passing variable at runtime − ... Read More
Introduction When working with Docker on Windows, it is possible to use network drives as volumes. This allows you to store data on a network drive and access it from within a Docker container. This can be useful in situations where you need to share data between containers, or between the host and the container. With network drive as volume, you can easily store, manage and backup your data in a centralized location and use it with multiple Docker containers. In this article, we will explore the process of adding network drives as volumes in Docker on Windows, and the ... Read More
Tuples are an important data type in Python and are often used to store a fixed set of elements. In this article, we will be discussing how to pass a tuple as function arguments in Python. We will go over the syntax for passing tuple arguments and will provide examples of how to do so. Let us first understand the basics that, we will be needing to begin approaching the problem. The problem asks us to pass a tuple as a function argument, for that we need to know what a function in python is, what are function arguments, ... Read More
In Python, tuples are an immutable sequence type that is commonly used to store a collection of items. We can define a tuple in python using the round brackets enclosing the data that we wish to store − Var = (1, ‘a’, 3.7) There are times when we must use a single variable that has the elements of two or more different tuples. In those cases, we must know the ways we can merge them to create a single variable. In this article, we will be discussing how to merge two tuples in Python. Using + ... Read More
In Python, it is often necessary to check if a tuple is empty in order to determine what actions to take in a program. A tuple in python is a pre-defined datatype that stores heterogeneous data, data of different types, in a single variable. The items can be indexed for further operations and python provides a wide array of methods to work upon them. They are immutable by nature which means we cannot make changes after we have created a tuple. This is whenever we perform some operation on the tuple a new tuple with resulting values is created. ... Read More
In Python, tuples are immutable, meaning that once they are created, their elements cannot be modified. However, there may be times when you need to add elements to a tuple. In this article, we will be discussing how to add elements to a tuple in Python. We will go over the syntax for adding elements to a tuple and will provide examples of how to do so. Python tuples are very similar to Python lists, in that you can perform all the various operations that can be performed on lists. The only difference is that tuples cannot be modified after ... Read More
In this article, we will be discussing how to sort a tuple by values in Python. A tuple is a data structure that is similar to a list, but it is immutable, meaning that once it is created, we cannot change the values of the elements within it. Example Following is an example to create a tuple – tple = ("Hello", "world", "hi") print(tple) Output (“Hello”, “world”, “hi”) Ordered, immutable triple items can have multiple values. An index of [0] is assigned to the first item in a triple, [1] to the second, and so on. When we ... Read More