CODEWITHSUNDEEP
bashdockershelldockerfilealpine-linux
iamdeit
iamdeit

Reputation: 6055

Docker: How to use bash with an Alpine based docker image?

I created a docker image from openjdk:8-jdk-alpine and I want to use bash, rather than sh as my shell, however when I try to execute simple commands I get the following errors:

RUN bash
/bin/sh: bash: not found

RUN ./gradlew build
env: can't execute 'bash': No such file or directory

Upvotes: 473

Views: 470167

Answers (8)

James Geddes
James Geddes

Reputation: 956

Option 🐈: Start from Bash

The official bash image is based on Alpine and prevents you from needing to install bash every time. Simply use

docker pull bash

This was first published on Oct 19, 2016 at 6:43 pm.

Option 🐕: Use your Existing Base Image

If you want to use your existing base image, while avoiding the need to install bash on every container boot, then you can add this to your Dockerfile.

# Use openjdk:8-jdk-alpine as the base image
FROM openjdk:8-jdk-alpine

# Install bash package
RUN apk add --no-cache bash

Upvotes: 23

Cheng
Cheng

Reputation: 31

USER root

RUN apk add --no-cache bash

/bin/sh is good, but not enough to use. Sometimes /bin/bash is necessary. So I used above code to install bash in alpine.

Upvotes: 1

Roman Kazanovskyi
Roman Kazanovskyi

Reputation: 3599

It doesn't work because this docker image uses Busybox. Busybox is a popular minimal Docker base image that uses ash, a much more limited shell than bash.

If you use sbt-native-packager you just need to add support

enablePlugins(AshScriptPlugin)

Upvotes: 0

anubhava
anubhava

Reputation: 785856

Alpine docker image doesn't have bash installed by default. You will need to add the following commands to get bash:

RUN apk update && apk add bash

If you're using Alpine 3.3+ then you can just do:

RUN apk add --no-cache bash

To keep the docker image size small. (Thanks to comment from @sprkysnrky)

If you just want to connect to the container and don't need bash, you can use:

docker run --rm -i -t alpine /bin/sh --login

Upvotes: 728

Onat Korucu
Onat Korucu

Reputation: 1042

If you have the option (for instance if you are just creating the script), using an alpine image with bash installed such as alpine-bash might be clever.

Upvotes: 2

Sahith Vibudhi
Sahith Vibudhi

Reputation: 5225

To Install bash you can do:

RUN apk add --update bash && rm -rf /var/cache/apk/*

If you do not want to add extra size to your image, you can use ash or sh that ships with alpine.

Reference: https://github.com/smebberson/docker-alpine/issues/43

Upvotes: 14

user1738546
user1738546

Reputation: 679

RUN /bin/sh -c "apk add --no-cache bash"

worked for me.

Upvotes: 32

YYY
YYY

Reputation: 6341

Try using RUN /bin/sh instead of bash.

Upvotes: 464

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