• Fixing "externally-managed-environment" when Installing AWS CLI with pip

  2 min read

  
  

  If you're trying to install the AWS CLI using pip on a modern system, you might run into the following error:

  $ pip install --no-cache-dir awscli error: externally-managed-environment  × This environment is externally managed (...) 

  17/02/2025

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• Docker ENTRYPOINT vs CMD

  3 min read

  
  

  Docker is a popular tool for deploying and running applications in a containerized environment. One of the important features of Docker is the ability to define a command to be executed when a container is started. This command can be specified in the Dockerfile using two keyword: ENTRYPOINT and CMD.

  02/05/2023

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• AWS CLI in alpine

  1 min read

  
  

  The AWS CLI is a command line interface for interacting with AWS services. To install it in an Alpine-based container we can use pip instead of going thru all the trouble of downloading a zip and install it by running some script.

  09/02/2023

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• Container with alpine failing to execute a file with not found

  3 min read

  
  

  While building a container using alpine as a base image we can get a not found error while trying to execute a file that doesn't make much sense:

  $ docker run -it test /usr/local/bin/example-app exec /usr/local/bin/example-app: no such file or directory 

  14/11/2022

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• How docker generates container's names

  2 min read

  
  

  Everytime you create a container using docker, if not already set using --name, docker chooses a name for you: you can expect two words with a underscore:

  $ docker run --rm -d alpine sleep 24h 38c4cc4e87762fc113ef174e9a4989e13d21037678abd3fe73840b825f14c7bf $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 38c4cc4e8776 alpine "sleep 24h" 5 seconds ago Up 3 seconds romantic_shtern 

  For this example it was chosen romantic_shtern, but it can use a great variety of words:

  $ docker ps --all | grep -v "Up" | awk '{ print $NF }' NAMES mystifying_poitras suspicious_shtern focused_chatelet keen_mendel happy_jackson xenodochial_margulis kind_blackburn gallant_pascal trusting_thompson (...) 

  So, how does Docker generate names for it's containers?

  01/08/2022

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