I've got a Docker container running Ubuntu which I did as follows:
docker run -it ubuntu /bin/bash
however it doesn't seem to have ping. E.g.
bash: ping: command not found
Do I need to install that?
Seems a pretty basic command to be missing. I tried whereis ping which doesn't report anything.
Generally people pull the official image of Ubuntu/CentOS but they don't realize that these images are minimal and doesn't have any thing on the top of that.
For Ubuntu, this image is built from official rootfs tarballs provided by Canonical. Given that it is a minimal install of Ubuntu, this image only includes the C, C.UTF-8, and POSIX locales by default.
One can install net-tools (includes ifconfig, netstat), ip-utils(includes ping) andy other likes curl etc on container and can create image from container or can write Dockerfile that will install these tool while creating image.
Below is Dockerfile example, while creating image from this it will include these tools:
FROM vkitpro/ubuntu16.04
RUN apt-get update -y \
&& apt-get upgrade -y \
&& apt-get install iputils-ping -y \
&& apt-get install net-tools -y \
CMD bash
or launch container from base image and install these utilities on container and then commit to image. docker commit -m "any descriptive message" container_id image_name:lattest
That image will have all thing installed.
Every time you get this kind of error
bash: <command>: command not found
On a host with that command already working with this solution:
dpkg -S $(which <command>)
Don't have a host with that package installed? Try this:
apt-file search /bin/<command>
Alternatively you can use a Docker image which already has ping installed, e.g. busybox:
docker run --rm busybox ping SERVER_NAME -c 2
I have used the statement below on debian 10
apt-get install iputils-ping
This is the Docker Hub page for Ubuntu and this is how it is created. It only has (somewhat) bare minimum packages installed, thus if you need anything extra you need to install it yourself.
apt-get update && apt-get install -y iputils-ping
However usually you'd create a "Dockerfile" and build it:
mkdir ubuntu_with_ping
cat >ubuntu_with_ping/Dockerfile <<'EOF'
FROM ubuntu
RUN apt-get update && apt-get install -y iputils-ping
CMD bash
EOF
docker build -t ubuntu_with_ping ubuntu_with_ping
docker run -it ubuntu_with_ping
Please use Google to find tutorials and browse existing Dockerfiles to see how they usually do things :) For example image size should be minimized by running apt-get clean && rm -rf /var/lib/apt/lists/* after apt-get install commands.
Sometimes, the minimal installation of Linux in Docker doesn't define the path and therefore it is necessary to call ping using ....
cd /usr/sbin
ping <ip>
Source: Stackoverflow.com