• Busybox
    • 简介
    • 获取官方镜像
    • 运行 busybox
    • 相关资源

    Busybox

    简介

    Busybox - Linux 瑞士军刀

    BusyBox 是一个集成了一百多个最常用 Linux 命令和工具（如 cat、echo、grep、mount、telnet 等）的精简工具箱，它只需要几 MB 的大小，很方便进行各种快速验证，被誉为“Linux 系统的瑞士军刀”。

    BusyBox 可运行于多款 POSIX 环境的操作系统中，如 Linux（包括 Android）、Hurd、FreeBSD 等。

    获取官方镜像

    在 Docker Hub 中搜索 busybox 相关的镜像。

    1. $ docker search busybox
    2. NAME                            DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
    3. busybox                         Busybox base image.                             755       [OK]
    4. progrium/busybox                                                                63                   [OK]
    5. radial/busyboxplus              Full-chain, Internet enabled, busybox made...   11                   [OK]
    6. odise/busybox-python                                                            3                    [OK]
    7. multiarch/busybox               multiarch ports of ubuntu-debootstrap           2                    [OK]
    8. azukiapp/busybox                This image is meant to be used as the base...   2                    [OK]
    9. ...

    读者可以看到最受欢迎的镜像同时带有 OFFICIAL 标记，说明它是官方镜像。用户使用 docker pull 指令下载镜像 busybox:latest：

    1. $ docker pull busybox:latest
    2. busybox:latest: The image you are pulling has been verified
    3. e433a6c5b276: Pull complete
    4. e72ac664f4f0: Pull complete
    5. 511136ea3c5a: Pull complete
    6. df7546f9f060: Pull complete
    7. Status: Downloaded newer image for busybox:latest

    下载后，可以看到 busybox 镜像只有2.433 MB：

    1. $ docker image ls
    2. REPOSITORY                   TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
    3. busybox                   latest              e72ac664f4f0        6 weeks ago         2.433 MB

    运行 busybox

    启动一个 busybox 容器，并在容器中执行 grep 命令。

    1. $ docker run -it busybox
    2. / # grep
    3. BusyBox v1.22.1 (2014-05-22 23:22:11 UTC) multi-call binary.
    5. Usage: grep [-HhnlLoqvsriwFE] [-m N] [-A/B/C N] PATTERN/-e PATTERN.../-f FILE [FILE]...
    7. Search for PATTERN in FILEs (or stdin)
    9.         -H      Add 'filename:' prefix
    10.         -h      Do not add 'filename:' prefix
    11.         -n      Add 'line_no:' prefix
    12.         -l      Show only names of files that match
    13.         -L      Show only names of files that don't match
    14.         -c      Show only count of matching lines
    15.         -o      Show only the matching part of line
    16.         -q      Quiet. Return 0 if PATTERN is found, 1 otherwise
    17.         -v      Select non-matching lines
    18.         -s      Suppress open and read errors
    19.         -r      Recurse
    20.         -i      Ignore case
    21.         -w      Match whole words only
    22.         -x      Match whole lines only
    23.         -F      PATTERN is a literal (not regexp)
    24.         -E      PATTERN is an extended regexp
    25.         -m N    Match up to N times per file
    26.         -A N    Print N lines of trailing context
    27.         -B N    Print N lines of leading context
    28.         -C N    Same as '-A N -B N'
    29.         -e PTRN Pattern to match
    30.         -f FILE Read pattern from file

    查看容器内的挂载信息。

    1. / # mount
    2. rootfs on / type rootfs (rw)
    3. none on / type aufs (rw,relatime,si=b455817946f8505c)
    4. proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
    5. tmpfs on /dev type tmpfs (rw,nosuid,mode=755)
    6. shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
    7. devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
    8. sysfs on /sys type sysfs (ro,nosuid,nodev,noexec,relatime)
    9. /dev/disk/by-uuid/b1f2dba7-d91b-4165-a377-bf1a8bed3f61 on /etc/resolv.conf type ext4 (rw,relatime,errors=remount-ro,data=ordered)
    10. /dev/disk/by-uuid/b1f2dba7-d91b-4165-a377-bf1a8bed3f61 on /etc/hostname type ext4 (rw,relatime,errors=remount-ro,data=ordered)
    11. /dev/disk/by-uuid/b1f2dba7-d91b-4165-a377-bf1a8bed3f61 on /etc/hosts type ext4 (rw,relatime,errors=remount-ro,data=ordered)
    12. devpts on /dev/console type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    13. proc on /proc/sys type proc (ro,nosuid,nodev,noexec,relatime)
    14. proc on /proc/sysrq-trigger type proc (ro,nosuid,nodev,noexec,relatime)
    15. proc on /proc/irq type proc (ro,nosuid,nodev,noexec,relatime)
    16. proc on /proc/bus type proc (ro,nosuid,nodev,noexec,relatime)
    17. tmpfs on /proc/kcore type tmpfs (rw,nosuid,mode=755)

    busybox 镜像虽然小巧，但包括了大量常见的 Linux 命令，读者可以用它快速熟悉 Linux 命令。

    相关资源

    • Busybox 官网：https://busybox.net/
    • Busybox 官方仓库：https://git.busybox.net/busybox/
    • Busybox 官方镜像：https://hub.docker.com/_/busybox/
    • Busybox 官方仓库：https://github.com/docker-library/busybox