I cannot install yum in my docker container

Question

I have a docker container which was built by a keycloak image.

I want to install vim in the container but I found that I need to have yum in order to install the vim. I tried to download yum from the internet and use rpm to install it, but the container didn't have sudo to let me change the file permission.

Following is my linux version:

NAME="Red Hat Enterprise Linux"
VERSION="8.0 (Ootpa)"
ID="rhel"
ID_LIKE="fedora"
VERSION_ID="8.0"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Red Hat Enterprise Linux 8.0 (Ootpa)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:8.0:GA"
HOME_URL="https://www.redhat.com/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"

REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 8"
REDHAT_BUGZILLA_PRODUCT_VERSION=8.0
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="8.0"

How can I get any text editor installed in the container?

Questions related to usage of programs are better suited for https://unix.stackexchange.com/ or https://serverfault.com/. — cyqsimon, Nov 18 '19 at 03:53

score 25 · Answer 1 · answered Nov 19 '19 at 19:14

25

Minimal RHEL 8 containers do not contain Yum (or DNF) because that requires Python, which inflates the size of an image quite a bit. However, it contains microdnf which is written in C and which has limited capabilities.

You should be able to do

microdnf install vim

or

microdnf install yum

answered Nov 19 '19 at 19:14

msuchy

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It says I do not have a permission to create a folder and I cannot use sudo to change my permission because sudo is not found........ – miketsui3a Nov 20 '19 at 09:19
@miketsui3a did you find a solution ? – Sankar Feb 17 '20 at 19:00

score 16 · Answer 2 · answered Apr 29 '20 at 15:33

16

connect as a root to your container:

docker exec -u root -it <container> bash

*then install vim (or what you need) with

microdnf install vim

answered Apr 29 '20 at 15:33

ali bouaziz

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1
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lovely stuff, awesome way out – kakabali May 24 '20 at 15:34

score 10 · Answer 3 · answered Feb 17 '20 at 19:06

10

I ran into the same problem and found a solution. In your Dockerfile, Try:

FROM jboss/keycloak:8.0.1
USER root
RUN microdnf install <whatever>

HTH.

answered Feb 17 '20 at 19:06

Sankar

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nice, because they run most of the commands using root user but just before the last command, they do `USER 1000` – kakabali May 24 '20 at 15:38

I cannot install yum in my docker container

3 Answers3

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