Busybox

简介

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

写于 2019年05月08日Docker 148

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