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325 lines
9.3 KiB
Plaintext
325 lines
9.3 KiB
Plaintext
.. _container-image-new:
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Build a new |CL|-based container image
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######################################
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This guide describes how to build a new |CL-ATTR|-based container image. The
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official base |CL-ATTR| container image is published on Docker\* Hub and is
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updated on a regular basis.
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.. contents::
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:local:
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:depth: 1
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Prerequisites
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*************
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* You must perform these steps on a |CL| system because the
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:abbr:`swupd (software updater)` is used to manage bundles in the
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container.
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* You must install the :file:`containers-basic` bundle on the |CL| system
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or Docker will not work.
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* You have a basic understanding of Docker.
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Build the base container image
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******************************
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#. Log in and get root privileges.
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.. code-block:: bash
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sudo -s
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#. Verify Docker is installed and running.
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.. code-block:: bash
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docker info
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If Docker is installed and running, the output is similar to
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this example:
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.. code-block:: console
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Containers: 0
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Running: 0
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Paused: 0
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Stopped: 0
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Images: 4
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Server Version: 17.05.0-ce
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Storage Driver: overlay
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Backing Filesystem: extfs
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Supports d_type: true
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Logging Driver: json-file
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Cgroup Driver: cgroupfs
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Plugins:
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Volume: local
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Network: bridge host macvlan null overlay
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Swarm: inactive
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Runtimes: runc
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Default Runtime: runc
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Init Binary: docker-init
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containerd version: (expected: 9048e5e50717ea4497b757314bad98ea3763c145)
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runc version: N/A (expected: 9c2d8d184e5da67c95d601382adf14862e4f2228)
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init version: N/A (expected: )
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Kernel Version: 4.12.7-377.native
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Operating System: Clear Linux OS for Intel Architecture
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OSType: linux
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Architecture: x86_64
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CPUs: 4
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Total Memory: 15.62GiB
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Name: clr-os
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ID: XQHJ:DYEM:3Q4D:DKLM:JOA4:RUSF:GAFR:DLPA:HOJP:W5FF:ULEE:7HZ3
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Docker Root Dir: /var/lib/docker
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Debug Mode (client): false
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Debug Mode (server): false
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Registry: https://index.docker.io/v1/
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Experimental: false
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Insecure Registries:
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127.0.0.0/8
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Live Restore Enabled: false
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If Docker is not installed, enter the commands:
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.. code-block:: bash
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swupd bundle-add containers-basic
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systemctl start docker
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#. Use :command:`os-install` to download and install the bundles.
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.. code-block:: bash
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swupd os-install --url https://cdn.download.clearlinux.org/update --statedir "$PWD"/swupd-state --no-boot-update -B os-core-update,editors,network-basic base
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The swupd example uses the following flags:
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* :command:`os-install` tells swupd to download and install.
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* :command:`--url` specifies the URL of the bundles repository.
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* :command:`--statedir` specifies the state directory where downloaded bundles and any state information are stored.
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* :command:`--no-boot-update` tells swupd to skip updating boot files because
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boot files are not required for a container.
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For more information on swupd flags, enter the :command:`swupd os-install -h`
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command.
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Example output:
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.. code-block:: console
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swupd-client software verify 3.12.2
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Copyright (C) 2012-2017 Intel Corporation
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Verifying version 17870
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Attempting to download version string to memory
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Downloading packs...
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Extracting python-basic pack for version 17820
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...14%
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Extracting perl-basic pack for version 17790
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...28%
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Extracting openssh-server pack for version 17660
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...42%
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Extracting editors pack for version 17850
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...57%
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Extracting network-basic pack for version 17650
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...71%
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Extracting os-core pack for version 17870
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...85%
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Extracting os-core-update pack for version 17870
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...100%
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Adding any missing files
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...88%
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Inspected 33982 files
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33974 files were missing
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33974 of 33974 missing files were replaced
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0 of 33974 missing files were not replaced
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Calling post-update helper scripts.
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WARNING: boot files update skipped due to --no-boot-update argument
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Fix successful
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.. note::
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The WARNING message is expected and can be ignored.
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#. Create a tarball and compress it.
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.. code-block:: bash
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tar -C base -cf base.tar .
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xz -v -T0 base.tar
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#. Create the Dockerfile to build the image.
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.. code-block:: bash
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cat > Dockerfile << EOF
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FROM scratch
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MAINTAINER First Last <first.last@example.com>
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ADD base.tar.xz /
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CMD ["/bin/bash"]
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EOF
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#. Build the |CL| container image.
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.. code-block:: bash
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docker build -t my-custom-clear-linux-container .
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Example output:
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.. code-block:: console
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Sending build context to Docker daemon 806.5MB
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Step 1/4 : FROM scratch
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--->
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Step 2/4 : MAINTAINER First Last <first.last@example.com>
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---> Running in 7238f35abcd0
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---> ec5064287c60
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Removing intermediate container 7238f35abcd0
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Step 3/4 : ADD base.tar.xz /
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---> 2723b7d20716
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Removing intermediate container 16e3ed0df8da
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Step 4/4 : CMD /bin/bash
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---> Running in efa893350647
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---> 5414c3a12993
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Removing intermediate container efa893350647
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Successfully built 5414c3a12993
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Successfully tagged my-custom-clear-linux-container:latest
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#. List the newly created |CL| container image.
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.. code-block:: bash
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docker images
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Example output:
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.. code-block:: console
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REPOSITORY TAG IMAGE ID CREATED SIZE
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my-custom-clear-linux-container latest 5414c3a12993 About a minute ago 616MB
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#. Launch the built |CL| container.
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.. code-block:: bash
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docker run -it my-custom-clear-linux-container
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Manage bundles in a container
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*****************************
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You can add and remove bundles from a |CL| container using the
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:command:`RUN swupd` command in the Dockerfile.
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Add a bundle
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============
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This example Dockerfile adds the :file:`pxe-server` bundle to an existing |CL|
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Docker image:
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.. code-block:: bash
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cat > Dockerfile << EOF
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FROM my-customer-clear-linux-container
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MAINTAINER First Last <first.last@example.com>
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RUN swupd bundle-add pxe-server
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CMD ["/bin/bash/bash"]
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EOF
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Example output:
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.. code-block:: console
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docker build -t my-clearlinux-with-pxe-server-bundle .
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Sending build context to Docker daemon 806.5MB
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Step 1/4 : FROM my-custom-clear-linux-container
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---> 5414c3a12993
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Step 2/4 : MAINTAINER First Last <first.last@example.com>
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---> Running in 19b4411cf4bd
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---> 08d400baffde
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Removing intermediate container 19b4411cf4bd
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Step 3/4 : RUN swupd bundle-add pxe-server
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---> Running in 3e634d6e0792
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swupd-client bundle adder 3.12.2
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Copyright (C) 2012-2017 Intel Corporation
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Attempting to download version string to memory
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Downloading packs...
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Extracting pxe-server pack for version 17820
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.
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Installing bundle(s) files...
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..............................................................................
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..............................................................................
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..............................................................................
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..............................................................................
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..............................................................................
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..............................................................................
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Calling post-update helper scripts.
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WARNING: systemctl not operable, unable to run systemd update triggers
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Bundle(s) installation done.
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---> 8ead5f2c0c33
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Removing intermediate container 3e634d6e0792
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Step 4/4 : CMD /bin/bash
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---> Running in 0ceae320279b
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---> dcd9adb40611
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Removing intermediate container 0ceae320279b
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Successfully built dcd9adb40611
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Successfully tagged my-clearlinux-with-pxe-server-bundle:latest
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.. note::
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The WARNING message can be ignored because systemd does not run inside
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a container.
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Remove a bundle
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===============
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This example Dockerfile removes the :file:`pxe-server` bundle from an existing
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|CL| Docker image:
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.. code-block:: bash
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cat > Dockerfile << EOF
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FROM my-clearlinux-with-pxe-server-bundle
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MAINTAINER First Last <first.last@example.com>
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RUN swupd bundle-remove pxe-server
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CMD ["/bin/bash/bash"]
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EOF
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Example output:
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.. code-block:: console
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docker build -t my-clearlinux-remove-pxe-server-bundle .
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Sending build context to Docker daemon 806.5MB
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Step 1/4 : FROM my-clearlinux-with-pxe-server-bundle
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---> dcd9adb40611
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Step 2/4 : MAINTAINER First Last <first.last@example.com>
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---> Running in 71b60f15003e
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---> 742192751c1a
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Removing intermediate container 71b60f15003e
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Step 3/4 : RUN swupd bundle-remove pxe-server
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---> Running in ad28a3390ecc
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swupd-client bundle remover 3.12.2
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Copyright (C) 2012-2017 Intel Corporation
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Removing bundle: pxe-server
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Deleting bundle files...
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Total deleted files: 92
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Untracking bundle from system...
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Success: Bundle removed
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1 bundle(s) were removed successfully
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---> d6ee7903e14d
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Removing intermediate container ad28a3390ecc
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Step 4/4 : CMD /bin/bash
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---> Running in 7694989e97de
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---> ec23189ef954
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Removing intermediate container 7694989e97de
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Successfully built ec23189ef954
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Successfully tagged my-clearlinux-remove-pxe-server-bundle:latest
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