Questions
Find answers to frequently asked development questions. For information about Better Stack products, explore our docs.
How to fix name is already in use by container error in Docker?
The error "name is already in use by container" occurs when you try to start a Docker container with a name that is already in use by another container. Here are some steps you can take to fix this...
How can I expose more than 1 port with Docker?
You can expose more than one port in a Docker container by using the -p option when starting the container. The -p option maps a port on the host machine to a port in the container. You can specify...
How to fix "Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running?"
The error message "Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running?" typically occurs when the Docker client is unable to connect to the Docker daemon...
How to update PATH environment variable in a Dockerfile?
To update the PATH environment variable in a Dockerfile, you can use the ENV instruction to set the new value of the PATH variable. Here's an example: FROM ubuntu Set a new value for the PATH envir...
How to fix “no space left on device” error in Docker?
The "no space left on device" error in Docker typically occurs when the Docker host system runs out of disk space, either on the host filesystem or within the Docker storage driver. To fix this err...
How to assign a port mapping to an existing Docker container?
To assign a port mapping to an existing Docker container, you can follow these steps: Identify the Container: Find the container ID or name of the Docker container you want to modify. You can use t...
What is the difference between "expose" and "publish" in Docker?
In Docker, "expose" and "publish" are two related but distinct concepts that are used to control network access to containers. The "expose" instruction is used in a Dockerfile to specify which port...
What is the runtime performance cost of a Docker container
The runtime performance cost of a Docker container can depend on a variety of factors, such as the host system's hardware resources, the size and complexity of the container, the workload running i...
User authentication in Laravel
Many web applications provide a way for their users to authenticate with the application and "login". Implementing this feature in web applications can be a complex and potentially risky endeavor. ...
How to populate databases in Laravel
Laravel includes the ability to seed your database with data using seed classes. All seed classes are stored in the database/seeders directory. By default, a DatabaseSeeder class is defined for you...
What is the difference between Factory and Seeder in Laravel?
Both Factory and Seeder are used to generate testing data for your application. But there are some differences: Factory By using factories you can easily create test data for your Laravel applicati...
What is the difference between collection and query builder in Laravel?
Query Builder Builder is a layer of abstraction between your application and the database. Typically it's used to provide a common API for you to build platform-agnostic database queries. $users = ...
How to log data in JSON in Laravel
Logging data in JSON format in Laravel can be done using the built-in Monolog logging library that Laravel uses under the hood. Here are the steps to configure Laravel to log data in JSON format: O...
How do I profile a Python script?
By default, Python contains a profiler called cProfile. It not only gives the total running time, but also times each function separately, and tells you how many times each function was called, mak...
How can I make a Python dictionary from separate lists of keys and values?
You can create a Python dictionary from two separate lists, where the first list contains keys and the second list contains values using the zip function. Here is an example of this in action: List...
How can I import a Python module dynamically given the full path?
Importing programmatically To programmatically import a module, use importlib.import_module(). import importlib itertools = importlib.import_module('itertools') Checking if a module can be imported...
How to start an HTTP server in Python?
You can create an HTTP server in python using the http.server module. Starting server from the command line To start a server from a command line, navigate to your projects directory cd /dev/myproj...
How to use different Python version with virtualenv?
You can create a virtual environment with a specific python version using the command below. Python 3 or newer For python 3, it is important to note that venv does not permit creating virtual envir...
How to create a singleton in Python?
The singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. Using metaclass In Python, there are multiple ways to do that but the most ef...
What does all mean in Python?
In Python, the all() function returns True if all elements of an iterable (e.g. list, tuple, etc.) are true, and False otherwise. For example: all([True, True, True]) True all([True, False, True]) ...
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