Can t run Curl command inside my Docker Container

Question

I created a docker container from my OS X VM Docker host   I created it using the run command and created the container based off the ubuntu xenial image off docker hub   I m now connected to my container after it s created and logged in as root and at the command prompt inside my container   I tried to install homebrew and for some reason  I can t run the command to install Homebrew   ruby -e    curl -fsSL https   raw githubusercontent com Homebrew install master install     when I run that I get a bash      curl  command not found   Not sure why I m not able to use curl here inside my container

User · Answer

If you are using an Alpine based image  you have to  RUN       apk add --no-cache curl   curl

User · Answer

curl  command not found   is a big hint  you have to install it with    apt-get update  apt-get install curl

User · Answer

You don t need to install curl to download the file into Docker container  use ADD command  e g  ADD https   raw githubusercontent com Homebrew install master install  tmp RUN ruby -e  tmp install  Note  Add above lines to your Dockerfile file   Another example which installs Azure CLI  ADD https   aka ms InstallAzureCLIDeb  tmp RUN bash  tmp InstallAzureCLIDeb

User · Answer

This is happening because there is no package cache in the image  you need to run   apt-get -qq update   before installing packages  and if your command is in a Dockerfile  you ll then need   apt-get -qq -y install curl   After that install ZSH and GIT Core   apt-get install zsh apt-get install git-core   Getting zsh to work in ubuntu is weird since sh does not understand the source command  So  you do this to install zsh   wget https   github com robbyrussell oh-my-zsh raw master tools install sh -O -   zsh   and then you change your shell to zsh   chsh -s  which zsh    and then restart   sudo shutdown -r 0   This problem is explained in depth in this issue

User · Answer

Ran into this same issue while using the CURL command inside my Dockerfile  As Gilles pointed out  we have to install curl first  These are the commands to be added in the  Dockerfile    FROM ubuntu 16 04    Install prerequisites RUN apt-get update  amp  amp  apt-get install -y   curl CMD  bin bash

User · Answer

So I added curl AFTER my docker container was running   This was for debugging the container   I did not need a permanent addition  I ran my image docker run -d -p 8899 8080 my-image latest   the above makes my  quot app quot  available on my machine on port 8899   not important to this question  Then I listed and created terminal into the running container  docker ps docker exec -it my-container-id-here  bin sh  If the exec command above does not work  check this SOF article  Error  Cannot Start Container  stat  bin sh  no such file or directory quot  then I ran  apk  just to prove it existed in the running container  then i ran  apk add curl  and got the below   apk add curl fetch http   dl-cdn alpinelinux org alpine v3 8 main x86 64 APKINDEX tar gz fetch http   dl-cdn alpinelinux org alpine v3 8 community x86 64 APKINDEX tar gz  1 5  Installing ca-certificates  20171114-r3   2 5  Installing nghttp2-libs  1 32 0-r0   3 5  Installing libssh2  1 8 0-r3   4 5  Installing libcurl  7 61 1-r1   5 5  Installing curl  7 61 1-r1  Executing busybox-1 28 4-r2 trigger Executing ca-certificates-20171114-r3 trigger OK  18 MiB in 35 packages  then i ran curl      curl curl  try  curl --help  or  curl --manual  for more information       Note  to get  quot out quot  of the drilled-in-terminal-window  I had to open a new terminal window and stop the running container  docker ps docker stop my-container-id-here  APPEND  If you don t have  quot apk quot   which depends on which base image you are using   then try to use  quot another quot  installer   From other answers here  you can try  apt-get -qq update  apt-get -qq -y install curl

[docker] Can't run Curl command inside my Docker Container

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