使用Distrobuilder构建Incus容器镜像

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在拥有了自己的Distrobuilder后（还没有？参见：为Incus构建Distrobuilder），我们来一起构建用于Incus的容器镜像，实现容器镜像自由吧！

一定会有人疑惑：既然已经有了LXC镜像站，为什么还需要自己构建镜像呢？

这是因为，本文希望描述一个全程可控的，避免过度抽象细节的，创建Incus容器镜像的方法。

预先准备

需要在系统上安装distrobuilder，可以使用snap下载，也可以自己构建：为Incus构建Distrobuilder。

案例1: Alpine Linux镜像

准备根文件系统(rootfs)

既然我们在讨论可控的构建过程，那么这一定包括一个可控的根文件系统(Root FileSystem, rootfs)。

让我们打开downloads | Alpine Linux，下拉找到MINI ROOT FILESYSTEM项目，下载对应架构的根文件系统。

例如，对于64位系统来说，我们将需要下载alpine-minirootfs-3.20.2-x86_64.tar.gz文件。中间的版本号请不要介意。

能不能用镜像站完成这一下载呢？又或者能不能用自己打包的Alpine Linux根文件系统呢？当然可以！这正是可控过程的魅力所在。

当然，distrobuilder实际上也已将下载rootfs的过程封装在程序中。就Alpine Linux来说，distrobuilder下载的rootfs和我们现在手动下载的是同一个文件。

如果更希望让distrobuilder代劳，请跳过当前这一步骤，后面会再展开介绍。

准备构建配置模板

构建镜像时需要的许多信息都由模板文件提供，如镜像的名称、类型、发行版，还有需要安装的软件包、执行的动作等等。

在distrobuilder中，镜像的模板文件是一个YAML文件，标准格式在官方仓库doc/examples/scheme.yaml中给出，文末也附有该文件复制过来的内容：

只不过，格式文件里，有非常多对键值。看起来一头雾水对吧？没关系，加法做不通我们可以做减法。

转到lxc/lxc-ci/images，这一目录下的镜像配置文件，就是Incus官方镜像服务器上，镜像构建所采用的配置文件。我们目前正在构建Alpine Linux，所以我们直接复制alpine.yaml文件中的内容到本地。由于内容太长，同样地，原始内容放在文末。

这文件也太长了吧？而且仔细一看，还有很多似乎我们不太用得上的配置项，例如适用于虚拟机镜像的命令，在容器中是用不到的。因此，让我们来进一步修改这些配置。

修改构建配置文件

Image: 容器镜像配置

首先，文件的第一节image部分，主要定义了镜像的名称和版本号等信息。

为了避免与官方构建的Alpine Linux镜像名称冲突，我们可以稍微修改一下这部分内容：

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image:
  distribution: "Custom Alpinelinux"
  name: custom-alpine
  release: 3.20

Source: 镜像rootfs来源配置

配置文件第二节，source部分，主要定义了用于构建容器镜像的rootfs如何获得。由于各Linux发行版的rootfs定义与下载地址都有差异，因此distrobuilder预定义了许多Source，用于解析各种操作系统的rootfs下载规则。

对于Alpine Linux，distrobuilder已经定义好了alpinelinux-http这一Source，因此如果希望distrobuilder帮我们自动下载rootfs，此处可定义如下：

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source:
  downloader: alpinelinux-http
  same_as: 3.12
  url: https://mirrors.hust.edu.cn/alpine/

其中，URL可以是任意Alpine Linux镜像站，以上例子使用了华中科大镜像站。不过，URL也可以file://开头，指向本地已经下载好的rootfs文件包。

如你所见，示例配置文件包含了一大段GPG公钥，用于验证下载的rootfs。如果信任下载源与下载文件完整性，并希望删掉keys部分以缩简配置文件，请在source节内加上skip_verification: true选项。

不过，既然我们正在尽可能追求可控，我们一定会想：

  • alpinelinux-http源在下载rootfs文件之外，是否还有额外的操作/Tricks？
  • 不考虑后文安装软件包等定制操作，在当前这一步是否有通用于所有Linux发行版rootfs的方法？
  • 是否可以利用已预先准备好的rootfs？

尽管根据sources/alpine-http.go源代码，就目前来说，并没有什么下载之外的额外小Tricks。但到目前为止，distrobuilder最新版3.0并没有直接提供使用现有rootfs目录直接构建容器系统的选项。如果直接在配置文件中删除source一节，进行构建时也会报错。

但是，distrobuilder的确提供了一种使用任意rootfs文件包的Source，即rootfs-http，相关源代码可见sources/rootfs-http.go。简单来说只需要提供一个指向rootfs包的URL，本地网络皆可。

因此，上述source节也可以改为（使用file://指向本地文件时需要使用绝对路径）：

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source:
  downloader: rootfs-http
  url: file:///absolute/path/to/alpine-minirootfs-3.20.2-x86_64.tar.gz

Target: 目标特定配置

如果仅希望构建Incus容器镜像，不需要LXC镜像和虚拟机镜像，可以直接把这一节大幅精简：

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targets:
  incus:

如有需要，请直接参阅Targets - distrobuilder documentation官方文档。

Files: 文件生成规则配置

和上面类似地，如果不需要Incus虚拟机镜像，仅仅需要保留用于Incus容器的部分，可以直接删除掉所有包含以下标记的虚拟机专用文件生成规则。

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types:
  - vm

Packages: 软件包安装预定义配置

这部分将定义Incus在构建镜像时，需要使用何种包管理器，安装哪些软件包，大部分内容可以直接照抄示例。同上，可以删掉所有虚拟机限定的配置。

重点讨论一下软件源相关配置。官方手册中，与定制软件源相关的选项位于packages节下，可以通过添加repositories节设置额外的软件源。例如：

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packages:
  # Other parameters
  # ...
  repositories:
    - name: hust
      url: |-
        https://mirrors.hust.edu.cn/alpine/v3.20/main
        https://mirrors.hust.edu.cn/alpine/v3.20/community

但是，这种方法会将新软件源附加到原本的软件源后，并不会替换掉速度可能非常缓慢的官方软件源。

如果希望替换掉rootfs中的官方软件源，我们可以不采用这种方案，请往下看。

Actions: 自定义操作

在这一部分，我们可以定义在容器构建的不同的时机要执行的操作(Action)。

目前，distrobuilder提供的执行时机（触发器/Trigger）包括：

  • post-unpack: 在rootfs被解压释放后执行。
  • post-update: 如果packages.update为true，在包管理器完成更新后执行。
  • post-packages: 在包管理器安装完所有指定的包后执行。
  • post-files: 在files配置块执行完成后执行。这一部分默认仅在build-lxc, build-incus, pack-lxc和pack-incus操作中执行。如果希望在build-dir操作中也执行这一块，需要指定--with-post-files选项。

例如，如果我们希望把rootfs中官方的软件源配置为镜像站，则可以添加一个post-unpack操作，内容如下：

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actions:
- trigger: post-unpack
  action: |-
    #!/bin/sh
    set -eux
    sed -i 's/dl-cdn.alpinelinux.org/mirrors.hust.edu.cn/g' /etc/apk/repositories

该命令会在rootfs解压挂载后，容器执行apk update更新软件源之前执行。

Mappings: 架构名称映射配置

这部分主要是告诉Distrobuilder如何处理不同架构名称之间的映射关系，如amd64与x86_64，aarch64与arm64等。

这部分按照模板直接保留就行，详情见Mappings - distrobuilder documentation官方文档。

不得不感慨一下，Linux由于各种历史包袱和不一致的规范，有时会略显混乱。

最终配置文件

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image:
  name: custom-alpine
  distribution: "Custom Alpinelinux"
  release: 3.20

source:
  downloader: rootfs-http
  url: file:///absolute/path/to/alpine-minirootfs-3.20.2-x86_64.tar.gz

targets:
  incus:

files:
- path: /etc/hostname
  generator: hostname

- path: /etc/hosts
  generator: hosts

- path: /etc/network/interfaces
  generator: dump
  content: |-
    auto eth0
    iface eth0 inet dhcp
    hostname $(hostname)

- path: /etc/inittab
  generator: dump
  content: |-
    # /etc/inittab
    ::sysinit:/sbin/openrc sysinit
    ::sysinit:/sbin/openrc boot
    ::wait:/sbin/openrc default

    # Set up a couple of getty's
    ::respawn:/sbin/getty 38400 console
    tty1::respawn:/sbin/getty 38400 tty1
    tty2::respawn:/sbin/getty 38400 tty2
    tty3::respawn:/sbin/getty 38400 tty3
    tty4::respawn:/sbin/getty 38400 tty4

    # Stuff to do for the 3-finger salute
    ::ctrlaltdel:/sbin/reboot

    # Stuff to do before rebooting
    ::shutdown:/sbin/openrc shutdown

- path: /etc/inittab
  generator: template
  name: inittab
  content: |-
    # /etc/inittab
    ::sysinit:/sbin/openrc sysinit
    ::sysinit:/sbin/openrc boot
    ::wait:/sbin/openrc default

    # Set up a couple of getty's
    ::respawn:/sbin/getty 38400 console

    # Stuff to do for the 3-finger salute
    ::ctrlaltdel:/sbin/reboot

    # Stuff to do before rebooting
    ::shutdown:/sbin/openrc shutdown

- name: meta-data
  generator: cloud-init
  variants:
  - cloud

- name: network-config
  generator: cloud-init
  content: |-
    version: 1
    config:
    - type: physical
      name: eth0
      subnets:
      - type: dhcp
        control: auto
  variants:
  - cloud

- name: user-data
  generator: cloud-init
  variants:
  - cloud

- name: vendor-data
  generator: cloud-init
  variants:
  - cloud

packages:
  manager: apk
  update: true
  cleanup: true
  sets:
  - packages:
    - alpine-base
    - logrotate
    - doas
    action: install

  - packages:
    - cloud-init
    - openssh
    - e2fsprogs-extra
    action: install
    variants:
    - cloud

  - packages:
    - py3-pyserial
    - py3-netifaces
    action: install
    variants:
    - cloud
    releases:
    - 3.17
    - 3.18
    - 3.19
    - 3.20
    - edge

actions:
- trigger: post-unpack
  action: |-
    #!/bin/sh
    set -eux
    sed -i 's/dl-cdn.alpinelinux.org/mirrors.hust.edu.cn/g' /etc/apk/repositories

- trigger: post-packages
  action: |-
    #!/bin/sh
    set -eux

    rm -f /var/cache/apk/*

- trigger: post-packages
  action: |-
    #!/bin/sh
    set -eux

    # Rewrite configuration for LXC
    sed -i 's/#rc_sys=""/rc_sys="lxc"/' /etc/rc.conf

    # Honor fstab by not making the localmount script a noop
    sed -i 's/-lxc//' /etc/init.d/localmount

    # Enable services
    for svc_name in bootmisc syslog devfs; do
        ln -s /etc/init.d/${svc_name} /etc/runlevels/boot/${svc_name}
    done

    for svc_name in networking crond; do
        ln -s /etc/init.d/${svc_name} /etc/runlevels/default/${svc_name}
    done
  types:
  - container

- trigger: post-files
  action: |-
    #!/bin/sh
    set -eux

    setup-cloud-init
  variants:
  - cloud

mappings:
  architecture_map: alpinelinux

我们将最终的配置文件保存，随便起个名字，比方说alpine.yaml即可。

开始构建

新建rootfs和images两个文件夹，分别用于暂存解压的rootfs，以及构建生成的镜像文件。

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mkdir rootfs
mkdir images

首先需要执行的是build-dir指令。

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sudo distrobuilder build-dir alpine.yaml rootfs

再接着执行pack-incus指令。

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sudo distrobuilder pack-incus alpine.yaml rootfs images

等待一切完成，images文件夹下就存放着构建好的容器镜像了。

此时一定有人会问：为什么要分两步？为什么不直接执行build-incus指令？

答案当然是可以的。

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sudo distrobuilder build-incus alpine.yaml images

有什么区别呢？我们来看看Distrobuilder开发者在论坛中的讨论：

Oops, I said build instead of pack here as that’s likely what you actually want to use.build-incus is equivalent of build-dir + pack-incus.

The reason why we do it in two steps in our CI is because we produce both LXC and Incus images so that lets us use the same rootfs for both. But if all you care about is the LXD/Incus image, just use build-incus directly.

导入Incus并开始使用

拥有了镜像，只需要导入Incus就可以开始使用了。

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incus image import images/incus.tar.xz images/rootfs.squashfs --alias custom-alpine/3.20

命令末尾的--alias选项用于给镜像定义一个别名。如果没有别名，我们就只能用镜像的哈希指代镜像了。

接着创建实例，启动镜像。

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incus launch local:custom-alpine/3.20 test-alp
incus exec test-alp -- /bin/ash

附录

配置文件

doc/examples/scheme.yaml

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# This example contains every possible key

image:
  description: |-
    here goes the image description
  distribution: distro
  release: release
  architecture: x86_64
  expiry: 30d
  variant: default
  name: distro-release-x86_64
  serial: some-random-string

source:
  downloader: ubuntu-http
  url: http://archive.ubuntu.com
  keys:
    - 0xdeadbeaf
  keyserver: http://keyserver.ubuntu.com
  variant: default
  suite: suite
  same_as: bionic
  skip_verification: false
  components:
    - main

targets:
  lxc:
    create_message: |-
      You just created an {{ image.description }} container.

      To enable SSH, run: apt install openssh-server
      No default root or user password are set by LXC.

    config:
      - type: all
        before: 5
        content: |-
          lxc.include = LXC_TEMPLATE_CONFIG/ubuntu.common.conf

      - type: user
        before: 5
        content: |-
          lxc.include = LXC_TEMPLATE_CONFIG/ubuntu.userns.conf

      - type: all
        after: 4
        content: |-
          lxc.include = LXC_TEMPLATE_CONFIG/common.conf

      - type: user
        after: 4
        content: |-
          lxc.include = LXC_TEMPLATE_CONFIG/userns.conf

      - type: all
        content: |-
          lxc.arch = {{ image.architecture_personality }}
  incus:
    vm:
      size: 2147483648
      filesystem: ext4

files:
  - generator: dump
    path: /some/path
    content: |-
      here goes the content
    name: name
    mode: 0644
    gid: 1000
    uid: 1000
    template:
      properties:
        key: value
      when:
        - always
    templated: true
    releases:
      - a
      - b
    architectures:
      - x86_64
    variants:
      - default

  - generator: hostname
    path: /etc/hostname

  - generator: hosts
    path: /etc/hosts

  - generator: remove
    path: /root/file

  - generator: template
    name: foo
    content: |-
      Here goes the content
    template:
      properties:
        key: value
      when:
        - create
        - copy

packages:
  manager: apt
  custom_manager:
    clean:
      cmd: mgr
      flags:
        - clean
    install:
      cmd: mgr
      flags:
        - install
    remove:
      cmd: mgr
      flags:
        - remove
    refresh:
      cmd: mgr
      flags:
        - refresh
    update:
      cmd: mgr
      flags:
        - update
    flags:
      - --yes
  update: true
  cleanup: false
  sets:
    - packages:
        - gnupg
      action: install
      early: true

    - packages:
        - vim
      action: install
      releases:
        - a
        - b
      architectures:
        - x86_64
      variants:
        - default

    - packages:
        - lightdm
      action: install
      flags:
        - --no-install-recommends

    - packages:
        - grub
      action: remove

  repositories:
    - name: reponame
      url: |-
        deb http://archive.ubuntu.com/ubuntu {{ image.release }}-updates main restricted universe multiverse
      type: type
      key: 0xdeadbeaf
      releases:
        - a
        - b
      architectures:
        - x86_64
      variants:
        - default

actions:
  - trigger: post-unpack
    action: |-
      #!/bin/sh

      do something after the rootfs has been unpacked

  - trigger: post-files
    action: |-
      #!/bin/sh

      do something after the files section has been processed

  - trigger: post-update
    action: |-
      #!/bin/sh

      do something after packages have been processed

  - trigger: post-packages
    action: |-
      #!/bin/sh

      do something after the packages section has been processed

    releases:
      - a
      - b
    architectures:
      - x86_64
    variants:
      - default

mappings:
  architectures:
    a: b
    c: d
  architecture_map: debian

environment:
  clear_defaults: true
  variables:
    - key: FOO
      value: bar

lxc/lxc-ci/images/alpine.yaml

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image:
  distribution: "alpinelinux"

source:
  downloader: alpinelinux-http
  same_as: 3.12
  url: https://mirror.csclub.uwaterloo.ca/alpine/
  keys:
  # 0482D84022F52DF1C4E7CD43293ACD0907D9495A
  - |-
    -----BEGIN PGP PUBLIC KEY BLOCK-----

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targets:
  lxc:
    create_message: |
      You just created an {{ image.description }} container.

    config:
    - type: all
      before: 5
      content: |-
        lxc.include = LXC_TEMPLATE_CONFIG/alpine.common.conf
    - type: user
      before: 5
      content: |-
        lxc.include = LXC_TEMPLATE_CONFIG/alpine.userns.conf
    - type: all
      after: 4
      content: |-
        lxc.include = LXC_TEMPLATE_CONFIG/common.conf
    - type: user
      after: 4
      content: |-
        lxc.include = LXC_TEMPLATE_CONFIG/userns.conf
    - type: all
      content: |-
        lxc.arch = {{ image.architecture_personality }}
  incus:
    vm:
      filesystem: ext4

files:
- path: /etc/hostname
  generator: hostname

- path: /etc/hosts
  generator: hosts

- generator: fstab
  types:
  - vm

- generator: incus-agent
  types:
  - vm

- path: /etc/default/grub
  generator: dump
  pongo: true
  content: |-
    # Set the recordfail timeout
    GRUB_RECORDFAIL_TIMEOUT=0

    # Do not wait on grub prompt
    GRUB_TIMEOUT=0

    # Set the default commandline
    GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 console=ttyS0 modules=sd-mod,usb-storage,{{ targets.incus.vm.filesystem }} rootfstype={{ targets.incus.vm.filesystem }}"

    # Set the grub console type
    GRUB_TERMINAL=console

    # Disable os-prober
    GRUB_DISABLE_OS_PROBER=true
  types:
  - vm

- path: /etc/network/interfaces
  generator: dump
  content: |-
    auto eth0
    iface eth0 inet dhcp
    hostname $(hostname)

- path: /etc/inittab
  generator: dump
  content: |-
    # /etc/inittab
    ::sysinit:/sbin/openrc sysinit
    ::sysinit:/sbin/openrc boot
    ::wait:/sbin/openrc default

    # Set up a couple of getty's
    ::respawn:/sbin/getty 38400 console
    tty1::respawn:/sbin/getty 38400 tty1
    tty2::respawn:/sbin/getty 38400 tty2
    tty3::respawn:/sbin/getty 38400 tty3
    tty4::respawn:/sbin/getty 38400 tty4

    # Stuff to do for the 3-finger salute
    ::ctrlaltdel:/sbin/reboot

    # Stuff to do before rebooting
    ::shutdown:/sbin/openrc shutdown

- path: /etc/inittab
  generator: template
  name: inittab
  content: |-
    # /etc/inittab
    ::sysinit:/sbin/openrc sysinit
    ::sysinit:/sbin/openrc boot
    ::wait:/sbin/openrc default

    # Set up a couple of getty's
    ::respawn:/sbin/getty 38400 console

    # Stuff to do for the 3-finger salute
    ::ctrlaltdel:/sbin/reboot

    # Stuff to do before rebooting
    ::shutdown:/sbin/openrc shutdown

- name: meta-data
  generator: cloud-init
  variants:
  - cloud

- name: network-config
  generator: cloud-init
  content: |-
    version: 1
    config:
    - type: physical
      name: eth0
      subnets:
      - type: dhcp
        control: auto
  variants:
  - cloud

- name: user-data
  generator: cloud-init
  variants:
  - cloud

- name: vendor-data
  generator: cloud-init
  variants:
  - cloud

packages:
  manager: apk
  update: true
  cleanup: true
  sets:
  - packages:
    - alpine-base
    - logrotate
    - doas
    action: install

  - packages:
    - cloud-init
    - openssh
    - e2fsprogs-extra
    action: install
    variants:
    - cloud

  - packages:
    - py3-pyserial
    - py3-netifaces
    action: install
    variants:
    - cloud
    releases:
    - 3.17
    - 3.18
    - 3.19
    - 3.20
    - edge

  - packages:
    - acpi
    - gcc
    - grub-efi
    - linux-virt
    - udev
    action: install
    types:
    - vm

actions:
- trigger: post-packages
  action: |-
    #!/bin/sh
    set -eux

    rm -f /var/cache/apk/*

- trigger: post-packages
  action: |-
    #!/bin/sh
    set -eux

    # Rewrite configuration for LXC
    sed -i 's/#rc_sys=""/rc_sys="lxc"/' /etc/rc.conf

    # Honor fstab by not making the localmount script a noop
    sed -i 's/-lxc//' /etc/init.d/localmount

    # Enable services
    for svc_name in bootmisc syslog devfs; do
        ln -s /etc/init.d/${svc_name} /etc/runlevels/boot/${svc_name}
    done

    for svc_name in networking crond; do
        ln -s /etc/init.d/${svc_name} /etc/runlevels/default/${svc_name}
    done
  types:
  - container

- trigger: post-files
  action: |-
    #!/bin/sh
    set -eux

    for svc_name in acpid bootmisc hostname hwclock loadkmap modules networking swap sysctl syslog urandom; do
        ln -fs /etc/init.d/${svc_name} /etc/runlevels/boot/${svc_name}
    done

    for svc_name in devfs dmesg hwdrivers mdev udev udev-settle udev-trigger; do
        ln -fs /etc/init.d/${svc_name} /etc/runlevels/sysinit/${svc_name}
    done

    target=/boot/grub/grub.cfg
    grub-mkconfig -o "${target}"
    sed -i "s#root=[^ ]*#root=${DISTROBUILDER_ROOT_UUID}#g" "${target}"

    TARGET="x86_64"
    [ "$(uname -m)" = "aarch64" ] && TARGET="arm64"
    grub-install --target=${TARGET}-efi --no-nvram --removable
    grub-install --target=${TARGET}-efi --no-nvram

    # Attempt to correct errors in the installation of all packages.
    apk fix
  types:
  - vm

- trigger: post-files
  action: |-
    #!/bin/sh
    set -eux

    for svc_name in sshd; do
        ln -fs /etc/init.d/${svc_name} /etc/runlevels/default/${svc_name}
    done

    # Tweak to prevent cloud-init from getting stuck.
    echo "datasource_list: ['NoCloud', 'ConfigDrive', 'LXD', 'None']" > /etc/cloud/cloud.cfg.d/99_lxc.cfg
  types:
  - vm
  variants:
  - cloud

- trigger: post-files
  action: |-
    #!/bin/sh
    set -eux

    setup-cloud-init
  variants:
  - cloud

mappings:
  architecture_map: alpinelinux