Debugging image mode hosts

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data-entity-uuid="0144d14f-4917-41c7-97d1-49b26b4bd6c6" data-entity-substitution="canonical">Image mode</a> is a new approach to build, deploy, and manage <a href="/en/technologies/linux-platforms/enterprise-linux" data-entity-type="node" data-entity-uuid="0e595473-7997-4c3f-b9dc-83e5cab31d0b" data-entity-substitution="canonical">Red Hat Enterprise Linux</a> using bootable containers. In a <a href="https://developers.redhat.com/articles/2024/09/24/bootc-getting-started-bootable-containers">previous blog post</a>, we shared a <a href="https://docs.fedoraproject.org/en-US/bootc/getting-started/">bootable containers guide</a> from the Fedora community to help you get started.</p><p>An important attribute of a bootable container is its immutability. An immutable operating system follows a different paradigm than traditional package-based systems. Immutability by default means security by design. Once deployed, the entire filesystem, with the exception of /etc and /var, is mounted read-only. This means that not even the root user has write privileges. Updates to the system are applied by downloading a new version of the bootable container image from a container registry, and then rebooting into the new state. It's a different way of approaching updates than using a package manager to update the system at runtime. It forces you to be intentional about changes to the operating system and gives you full state control.</p><h2>Debugging an immutable OS</h2><p>Production systems usually don't ship with debugging tools to keep the footprint as small as possible. On a traditional package-based system, you can use <code>dnf</code> to install strace for debugging purposes, but that doesn't exactly work in image mode. It's not sustainable to rebuild and reboot a bootable container image with debugging tools. Instead, you need a means to use debugging tools at runtime. Fortunately, there are two options.</p><h3>Option 1: bootc usr-overlay</h3><p>The <a href="https://github.com/containers/bootc">bootc tool</a> is the heart of<a href="https://red.ht/imagemode"> Image Mode for RHEL</a> and the core technology that enables OCI containers to encompass complete operating systems. Among other things, <code>bootc</code> is responsible for updating the operating system. It has a number of useful features for managing state and performing rollbacks. Additionally, it has functionality that's useful when debugging a system.</p><p dir="ltr">Suppose you want to install the strace command to help you debug some processes. You can use the bootc tool to temporarily unlock the operating system image by creating a transient writable overlayfs layer on /usr that gets discarded on reboot.</p><p>Open a terminal on the host system, and run the <code>bootc</code> command:</p><p><code>bootc usr-overlay</code></p><p dir="ltr">Now /usr is writable for root until the next reboot, which allows you to use dnf install strace for installation, just as you would on a traditional system.</p><h3>Option 2: Toolbx</h3><p>Image mode for RHEL is preinstalled with a development and troubleshooting tool called<a href="https://containertoolbx.org/"> Toolbx</a>. The command is available in the toolbox RPM, which we discussed in a <a href="https://developers.redhat.com/articles/2024/07/16/introducing-toolbx">previous article</a>. It's particularly useful for installing troubleshooting tools at runtime without rebuilding the container image and then rebooting. For similar reasons, it is already popular on operating systems like <a href="https://fedoraproject.org/coreos/">Fedora CoreOS</a> and <a href="https://fedoraproject.org/atomic-desktops/silverblue/">Silverblue</a>, which both have a similar design.</p><p>Toolbx enables you to use interactive command-line environments for software development, and troubleshooting the host operating system without having to install software on the host. It's built on top of<a href="https://podman.io/"> Podman</a> and other standard container technologies from<a href="https://opencontainers.org/"> OCI</a>.</p><p>Toolbx environments have seamless access to the user’s home directory, Wayland and X11 sockets, networking (including Avahi), removable devices (like USB drives), systemd journal, SSH agent, D-Bus, ulimits, /dev, the udev database, and so on.</p><p>Toolbx installs software at runtime on immutable systems by providing a fully mutable container. In this container, you can install your favorite development and troubleshooting tools, editors, and SDKs. For example, it’s possible to do a dnf install -y strace without affecting the host operating system, and yet inspect the processes running on the host.</p><p>The Toolbx environment is based on an OCI image. On Red Hat Enterprise Linux, it defaults to the toolbox image from registry.access.redhat.com. This image is used to create a Toolbx container that offers the interactive command-line environment.</p><p>To get started, create a new container:</p><p><code>toolbox create</code></p><p dir="ltr">Then enter the environment:</p><p><code>toolbox enter</code></p><p dir="ltr">This presents an interactive command-line environment that looks and feels just like the one on the host operating system. The Toolbx commands are self-documenting. When you type an incomplete command, Toolbx provides documentation on what it expects next.</p><p dir="ltr">Toolbx can be used for a lot more than just strace. Everything from <a href="https://www.ansible.com/">Ansible</a> to <a href="https://nmap.org/">Nmap</a> to journalctl is possible, and it can be used both as your usual login UID and root. For more use cases and detailed examples, refer to the official <a href="https://containertoolbx.org/use/">Toolbx documentation</a>.</p><h3>More about bootable containers</h3><p>If you're interested in bootable containers, we recommend taking a look at the upstream <a href="https://docs.fedoraproject.org/en-US/bootc/getting-started/">Getting Started Guide</a> and Valentin's presentation on YouTube.</p><p><iframe width="560" height="315" src="https://www.youtube.com/embed/bf1xqjLeA9M?si=ZriYaKQOXgviKz3w" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen loading="lazy"></iframe></p> </div> <div class="dx-col-12 dx-mt-4 dx-mb-4"> </div> <hr class="rh-divider-content-rule">  <div class="rh-card-header--component" data-rh-align="left" ><h3 class="rh-card-header-title">執筆者紹介</h3></div>  <div class="rh-speaker-wrapper">  <div class="rh-card--layout " data-rh-background="gray" data-rh-theme="light" data-rh-bg-align="cover" data-rh-layout="stacked"><div class="rh-card-content" data-rh-layout="stacked" >  <div class="rh-speaker-group--layout" > <div class="rh-speaker-group-body" data-rh-layout="media-object-md" >  <div class="rh-image-embed--component" data-rh-align="left" data-rh-image-embed='speaker-variant1' data-rh-img-background="gray" > <div class="rh-image-embed-container"> <a class="rh-image-embed-link" href="/ja/authors/valentin-rothberg"> <div class="rh-image-embed-span" > <img class="rh-image-embed-img" src="https://www.redhat.com/rhdc/managed-files/styles/media_thumbnail/private/sysadmin/pictures/2019-12/vlntnrthbg.jpg?itok=Tu-s5EZg" alt="Valentin Rothberg" loading="lazy" > </div> </a> </div> </div>  <div class="rh-group--layout" id=name_social_image_group > <div class="rh-group-body" data-rh-layout="thin-stacked" >  <div class="rh-person--component" itemscope itemtype="http://schema.org/Person" data-rh-align="left" data-rh-speaker-variant=variant1 data-rh-link-wrap ><a class="rh-person-link-wrap" href="/ja/authors/valentin-rothberg"><h3 class="rh-person-name-small" itemprop="name"> Valentin Rothberg </h3></a></div>  <div class="rh-person--component" itemscope itemtype="http://schema.org/Person" data-rh-speaker-variant=variant1 ><span class="rh-person-bio" itemprop="description"><p>Container engineer at Red Hat, bass player, music lover.</p></span></div>  <span class="rh-cta--component" data-rh-cta-type="secondary" > <a class="rh-cta-link" href="/ja/authors/valentin-rothberg" data-analytics-linkType="cta" >Read full bio<span aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 36 36"> <path d="M31.58 18.24a.64.64 0 0 0-.14-.68l-9-9c-.56-.58-1.47.32-.88.88l7.93 7.94H5a.62.62 0 1 0 0 1.24h24.49l-7.93 7.94a.62.62 0 0 0 .88.88l9-9a.72.72 0 0 0 .14-.2Z"/> </svg> </span></a> </span> </div> </div> </div> </div>  </div> </div> </div>  <div class="rh-speaker-wrapper">  <div class="rh-card--layout " data-rh-background="gray" data-rh-theme="light" data-rh-bg-align="cover" data-rh-layout="stacked"><div class="rh-card-content" data-rh-layout="stacked" >  <div class="rh-speaker-group--layout" > <div class="rh-speaker-group-body" data-rh-layout="media-object-md" >  <div class="rh-image-embed--component" data-rh-align="left" data-rh-image-embed='speaker-variant1' data-rh-img-background="gray" > <div class="rh-image-embed-container"> <a class="rh-image-embed-link" href="/ja/authors/pthomas"> <div class="rh-image-embed-span" > <img class="rh-image-embed-img" src="https://www.redhat.com/rhdc/managed-files/styles/media_thumbnail/private/sysadmin/pictures/2021-09/Preethi-Thomas.jpg?itok=NrFF712r" alt="Preethi Thomas" loading="lazy" > </div> </a> </div> </div>  <div class="rh-group--layout" id=name_social_image_group > <div class="rh-group-body" data-rh-layout="thin-stacked" >  <div class="rh-person--component" itemscope itemtype="http://schema.org/Person" data-rh-align="left" data-rh-speaker-variant=variant1 data-rh-link-wrap ><a class="rh-person-link-wrap" href="/ja/authors/pthomas"><h3 class="rh-person-name-small" itemprop="name"> Preethi Thomas </h3></a></div>  <div class="rh-person--component" itemscope itemtype="http://schema.org/Person" data-rh-speaker-variant=variant1 ><span class="rh-person-bio" itemprop="description"><p>Preethi Thomas is an Engineering Manager for the containers team at Red Hat. 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