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docker_practice/cases/os/busybox.md
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Signed-off-by: Kang Huaishuai <khs1994@khs1994.com>
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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。

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

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 busybox:latest 镜像：

$ docker pull busybox:latest
latest: Pulling from library/busybox
5c4213be9af9: Pull complete
Digest: sha256:c6b45a95f932202dbb27c31333c4789f45184a744060f6e569cc9d2bf1b9ad6f
Status: Downloaded newer image for busybox:latest
docker.io/library/busybox:latest

下载后，可以看到 busybox 镜像只有 2.433 MB：

$ docker image ls
REPOSITORY                   TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
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。

$ docker run -it busybox
/ # grep
BusyBox v1.22.1 (2014-05-22 23:22:11 UTC) multi-call binary.

Usage: grep [-HhnlLoqvsriwFE] [-m N] [-A/B/C N] PATTERN/-e PATTERN.../-f FILE [FILE]...

Search for PATTERN in FILEs (or stdin)

        -H      Add 'filename:' prefix
        -h      Do not add 'filename:' prefix
        -n      Add 'line_no:' prefix
        -l      Show only names of files that match
        -L      Show only names of files that don't match
        -c      Show only count of matching lines
        -o      Show only the matching part of line
        -q      Quiet. Return 0 if PATTERN is found, 1 otherwise
        -v      Select non-matching lines
        -s      Suppress open and read errors
        -r      Recurse
        -i      Ignore case
        -w      Match whole words only
        -x      Match whole lines only
        -F      PATTERN is a literal (not regexp)
        -E      PATTERN is an extended regexp
        -m N    Match up to N times per file
        -A N    Print N lines of trailing context
        -B N    Print N lines of leading context
        -C N    Same as '-A N -B N'
        -e PTRN Pattern to match
        -f FILE Read pattern from file

查看容器内的挂载信息。

/ # mount
overlay on / type overlay (rw,relatime,lowerdir=/var/lib/docker/overlay2/l/BOTCI5RF24AMC4A2UWF4N6ZWFP:/var/lib/docker/overlay2/l/TWVP5T5DMKJGXZOROR7CAPWGFP,upperdir=/var/lib/docker/overlay2/801ef0bf6cce35288dbb8fe00a4f9cc47760444693bfdf339ed0bdcf926e12a3/diff,workdir=/var/lib/docker/overlay2/801ef0bf6cce35288dbb8fe00a4f9cc47760444693bfdf339ed0bdcf926e12a3/work)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev type tmpfs (rw,nosuid,size=65536k,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
sysfs on /sys type sysfs (ro,nosuid,nodev,noexec,relatime)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,relatime,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (ro,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (ro,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/freezer type cgroup (ro,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (ro,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/cpuset type cgroup (ro,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/blkio type cgroup (ro,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (ro,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/memory type cgroup (ro,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (ro,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/pids type cgroup (ro,nosuid,nodev,noexec,relatime,pids)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
/dev/vda1 on /etc/resolv.conf type ext3 (rw,noatime,data=ordered)
/dev/vda1 on /etc/hostname type ext3 (rw,noatime,data=ordered)
/dev/vda1 on /etc/hosts type ext3 (rw,noatime,data=ordered)
devpts on /dev/console type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
proc on /proc/bus type proc (ro,relatime)
proc on /proc/fs type proc (ro,relatime)
proc on /proc/irq type proc (ro,relatime)
proc on /proc/sys type proc (ro,relatime)
proc on /proc/sysrq-trigger type proc (ro,relatime)
tmpfs on /proc/acpi type tmpfs (ro,relatime)
tmpfs on /proc/kcore type tmpfs (rw,nosuid,size=65536k,mode=755)
tmpfs on /proc/keys type tmpfs (rw,nosuid,size=65536k,mode=755)
tmpfs on /proc/timer_list type tmpfs (rw,nosuid,size=65536k,mode=755)
tmpfs on /proc/sched_debug type tmpfs (rw,nosuid,size=65536k,mode=755)
tmpfs on /sys/firmware type tmpfs (ro,relatime)

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。

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