Can't Run Dmidecode on Docker Container

Can't run dmidecode on docker container

Docker provides an isolation layer, and one of the major goals of Docker is to hide details of the host's hardware from containers. The easiest, most appropriate way to query low-level details of the host's hardware is from a root shell on the host, ignoring Docker entirely.

The actual mechanism of this is by restricting Linux capabilities. capabilities(7) documents that you need CAP_SYS_RAWIO to access /dev/mem, so in principle you can launch your container with --cap-add SYS_RAWIO. You might need other capabilities and/or device access to make this actually work, because Docker is hiding the details of what you're trying to access as a design goal.

Docker RUN apt-get install - Unable to locate package

Your Dockerfile pulls ubuntu which defaults to latest tag, which is jammy-jellyfish/22.04. guile-2.0-dev doesn't exist in that version, it was upgraded to guile-2.2-dev, so you'd want to do RUN apt-get update && apt-get install -y guile-2.2-dev.

FROM ubuntu

ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update && apt-get install -y bison guile-2.2-dev

If you specifically need guile-2.0-dev, you will need FROM ubuntu:focal (v20.04) or FROM ubuntu:bionic (v18.04) depending on what Ubuntu you want.

FROM ubuntu:focal

ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update && apt-get install -y bison guile-2.0-dev

---

Also see the ubuntu packages list: https://packages.ubuntu.com/cgi-bin/search_packages.pl?keywords=guile&searchon=names&release=all

Package guile-2.0-dev

    bionic (18.04LTS) (lisp): Development files for Guile 2.0
    2.0.13+1-5build2: amd64 arm64 armhf i386 ppc64el s390x
    bionic-updates (lisp): Development files for Guile 2.0
    2.0.13+1-5ubuntu0.1: amd64 arm64 armhf i386 ppc64el s390x
    focal (20.04LTS) (lisp): Development files for Guile 2.0 [universe]
    2.0.13+1-5.4: amd64 arm64 armhf i386 ppc64el s390x

Package guile-2.2-dev

    bionic (18.04LTS) (lisp): Development files for Guile 2.2 [universe]
    2.2.3+1-3build1: amd64 arm64 armhf i386 ppc64el s390x
    bionic-updates (lisp): Development files for Guile 2.2 [universe]
    2.2.3+1-3ubuntu0.1: amd64 arm64 armhf i386 ppc64el s390x
    focal (20.04LTS) (lisp): Development files for Guile 2.2
    2.2.7+1-4: amd64 arm64 armhf i386 ppc64el s390x
    impish (21.10) (lisp): Development files for Guile 2.2
    2.2.7+1-6build1: amd64 arm64 armhf i386 ppc64el s390x
    jammy (22.04LTS) (lisp): Development files for Guile 2.2
    2.2.7+1-6build2: amd64 arm64 armhf i386 ppc64el s390x
    kinetic (lisp): Development files for Guile 2.2 [universe]
    2.2.7+1-6build2: amd64 arm64 armhf ppc64el s390x

How to obtain the number of CPUs/cores in Linux from the command line?

grep -c ^processor /proc/cpuinfo

will count the number of lines starting with "processor" in /proc/cpuinfo

For systems with hyper-threading, you can use

grep ^cpu\\scores /proc/cpuinfo | uniq |  awk '{print $4}'

which should return (for example) 8 (whereas the command above would return 16)

---

Related Topics