Installing netstat on docker linux container

linux docker netstat
octavian picture octavian · Jan 31, 2017 · Viewed 26.9k times · Source

I want to install netstat on my Docker container.

I looked here https://askubuntu.com/questions/813579/netstat-or-alternative-in-docker-ubuntu-server-16-04-container so I'm trying to install it like this:

apt-get install net-tools

However, I'm getting:

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package net-tools

So how can I install netstat?

Answer

BMitch picture BMitch · Jan 31, 2017

You need to run apt-get update first to download the current state of the package repositories. Docker images do not include this to save space, and because they'd likely be outdated when you use it. If you are doing this in a Dockerfile, make sure to keep it as a single RUN command so that caching of the layers doesn't cache an old version of the update command with a new package install request:

RUN apt-get update \
  && DEBIAN_FRONTEND=noninteractive apt-get install -y \
    net-tools \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*

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