Can't install pip and python & ansible using Dockerfile in CentOS

Question

I am trying to install python and pip & Ansible using Dockerfile but I get this error

/bin/sh: 1: python: not found
The command '/bin/sh -c curl -O https://bootstrap.pypa.io/pip/2.7/get-pip.py &&     python get-pip.py &&     python -m pip install --upgrade "pip < 21.0" &&     pip install ansible --upgrade' returned a non-zero code: 127
ERROR: Service 'jenkins' failed to build : Build failed

Here is my Dockerfile:

FROM jenkins/jenkins

USER root



RUN curl -O https://bootstrap.pypa.io/pip/2.7/get-pip.py && \
    python get-pip.py && \
    python -m pip install --upgrade "pip < 21.0" && \
    pip install ansible --upgrade





USER jenkins

Note: I used the same instructions on another Dockerfile and it went without errors. Here is the Dockerfile from CentOS image:

FROM centos:7

RUN yum update -y && \
    yum -y install openssh-server && \
    yum install -y passwd

RUN useradd remote_user && \
    echo "password" | passwd remote_user  --stdin && \
    mkdir /home/remote_user/.ssh && \
    chmod 700 /home/remote_user/.ssh

COPY remote-key.pub /home/remote_user/.ssh/authorized_keys

RUN chown remote_user:remote_user   -R /home/remote_user && \
    chmod 600 /home/remote_user/.ssh/authorized_keys

RUN /usr/sbin/sshd-keygen

RUN yum -y install mysql

RUN curl -O https://bootstrap.pypa.io/pip/2.7/get-pip.py && \
    python get-pip.py && \
    python -m pip install --upgrade "pip < 21.0" && \
    pip install awscli --upgrade

CMD /usr/sbin/sshd -D

Answer 1

SOLVED !!

I deleted RUN instructions and replaced it with:

RUN apt-get update
RUN apt-get install -y ansible

Worked like a charm.

Answer 2

Since I'm not entirely sure my comments were fully understandable, here is how I would install ansible in your current base image jenkins/jenkins .

Notes:

• I fixed the tag to lts since building from latest is a bit on the edge. You can change that to whatever tag suits your needs.
• I used two RUN directives (one for installing python, the other for ansible) but you can merge them in a single instruction if you want to further limit the number of layers.

FROM jenkins/jenkins:lts

USER root

RUN apt-get update &&\
    apt-get install -y python3-pip &&\
    rm -rf /var/lib/apt/lists/*

RUN pip install --upgrade pip &&\
    pip install ansible &&\
    pip cache purge

USER jenkins