BusyBox是一个遵循GPL协议、以自由软件形式发行的应用程序。 Busybox在单一的可执行文件中提供了精简的Unix工具集，可运行于多款POSIX环境的操作系统，例如Linux（包括Android）、Hurd、FreeBSD等等。 由于BusyBox可执行文件的文件比较小，使得它非常适合使用于嵌入式系统。 作者将BusyBox称为“嵌入式Linux的瑞士军刀”。 ![](https://cdn.isharkfly.com/com-isharkfly-www/discourse-uploads/original/2X/9/9476441a8d5ae2280eb7dfbdc1b26be085b314b2.png) 在以前，Docker 官方为了压缩容量，保证容器的启用，其实都在使用 busybox，但后期，Docker 官方开始使用 Alpine 来替代 busybox。 ## 获取官方镜像 可以使用 `docker pull` 指令下载 `busybox:latest` 镜像： ```bash PS C:\Users\yhu> docker pull busybox:latest latest: Pulling from library/busybox ec562eabd705: Pull complete Digest: sha256:5eef5ed34e1e1ff0a4ae850395cbf665c4de6b4b83a32a0bc7bcb998e24e7bbb Status: Downloaded newer image for busybox:latest docker.io/library/busybox:latest What's Next? View a summary of image vulnerabilities and recommendations → docker scout quickview busybox:latest PS C:\Users\yhu> ``` 下载后，可以看到 `busybox` 镜像只有 *4.26 MB*： ```bash PS C:\Users\yhu> docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE repo-docker.isharkfly.com/docker-hub/visatrack latest a329341dbaeb 3 days ago 522MB repo-docker.isharkfly.com/docker-hub/visatrack f5f9d8b3b410 3 days ago 522MB alpine/git latest 80ed206c002b 7 days ago 50.4MB data-mq-service 0.0.1-SNAPSHOT 7eb277a365d6 3 weeks ago 475MB docsify-docs 0.0.1 32062033284a 6 weeks ago 1.13GB 0ebfbefe1d52 6 weeks ago 1.13GB alpine latest 05455a08881e 3 months ago 7.38MB zchub-crawler latest b20aa408fe8f 7 months ago 1.6GB mq-service 0.0.1-SNAPSHOT 308dd50eb67a 7 months ago 441MB reso-web-api-reference-server-odata-manager-app latest 27cdaae03879 8 months ago 441MB reso-builder latest cabba9a35a22 8 months ago 1.47GB busybox latest 65ad0d468eb1 11 months ago 4.26MB tutor-service 0.0.1-SNAPSHOT 20d2f52a1fc4 13 months ago 521MB sharkfly-wechat-service 0.0.1-SNAPSHOT 0d3e7843994e 13 months ago 465MB eclipse-temurin 17-jdk-alpine 9a0a4e74d117 13 months ago 358MB rabbitmq 3.11-management 04a3a28a368b 13 months ago 255MB framework-spring-docker 0.0.1-SNAPSHOT 42e51829e8c7 15 months ago 379MB adoptopenjdk/openjdk11-openj9 alpine b533cd6150ba 15 months ago 379MB mysql/mysql-server latest 1d9c2219ff69 16 months ago 496MB docker101tutorial latest e60bd4e10534 17 months ago 47MB alpine/git 22d84a66cda4 17 months ago 43.6MB PS C:\Users\yhu> ``` 如果只说是大小来说，Alpine 也大不了多少，但 Alpine 提供了更多的功能。 ![](https://cdn.isharkfly.com/com-isharkfly-www/discourse-uploads/optimized/2X/9/91d312f7dcb94ff748f848881baac4cbd4ea8f2c_2_690x390.png) 这也就是为什么 Docker 官方切换到 Alpine 的原因。 ## 运行 busybox 启动一个 `busybox` 容器，并在容器中执行 `grep` 命令。 从启动的速度来看，那就是几乎是光速了。 ```bash PS C:\Users\yhu> docker run -it busybox / # grep BusyBox v1.36.1 (2023-05-18 22:34:17 UTC) multi-call binary. Usage: grep [-HhnlLoqvsrRiwFE] [-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 -R Recurse and dereference symlinks -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。 ```bash / # mount overlay on / type overlay (rw,relatime,lowerdir=/var/lib/docker/overlay2/l/K7LGRMOMB4YBJOAIY37TDH27OH:/var/lib/docker/overlay2/l/WV2IR37DT2RO7IBXLLNKC5WMBI,upperdir=/var/lib/docker/overlay2/deeb782171b9c2a33054df6b46a3125dc7d283d3af2136a4cc2aa84ec9c9a388/diff,workdir=/var/lib/docker/overlay2/deeb782171b9c2a33054df6b46a3125dc7d283d3af2136a4cc2aa84ec9c9a388/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 (rw,nosuid,nodev,noexec,relatime,mode=755) cpuset on /sys/fs/cgroup/cpuset type cgroup (ro,nosuid,nodev,noexec,relatime,cpuset) cpu on /sys/fs/cgroup/cpu type cgroup (ro,nosuid,nodev,noexec,relatime,cpu) cpuacct on /sys/fs/cgroup/cpuacct type cgroup (ro,nosuid,nodev,noexec,relatime,cpuacct) blkio on /sys/fs/cgroup/blkio type cgroup (ro,nosuid,nodev,noexec,relatime,blkio) memory on /sys/fs/cgroup/memory type cgroup (ro,nosuid,nodev,noexec,relatime,memory) devices on /sys/fs/cgroup/devices type cgroup (ro,nosuid,nodev,noexec,relatime,devices) freezer on /sys/fs/cgroup/freezer type cgroup (ro,nosuid,nodev,noexec,relatime,freezer) net_cls on /sys/fs/cgroup/net_cls type cgroup (ro,nosuid,nodev,noexec,relatime,net_cls) perf_event on /sys/fs/cgroup/perf_event type cgroup (ro,nosuid,nodev,noexec,relatime,perf_event) net_prio on /sys/fs/cgroup/net_prio type cgroup (ro,nosuid,nodev,noexec,relatime,net_prio) hugetlb on /sys/fs/cgroup/hugetlb type cgroup (ro,nosuid,nodev,noexec,relatime,hugetlb) pids on /sys/fs/cgroup/pids type cgroup (ro,nosuid,nodev,noexec,relatime,pids) rdma on /sys/fs/cgroup/rdma type cgroup (ro,nosuid,nodev,noexec,relatime,rdma) misc on /sys/fs/cgroup/misc type cgroup (ro,nosuid,nodev,noexec,relatime,misc) cgroup on /sys/fs/cgroup/systemd type cgroup (ro,nosuid,nodev,noexec,relatime,name=systemd) 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/sdd on /etc/resolv.conf type ext4 (rw,relatime,discard,errors=remount-ro,data=ordered) /dev/sdd on /etc/hostname type ext4 (rw,relatime,discard,errors=remount-ro,data=ordered) /dev/sdd on /etc/hosts type ext4 (rw,relatime,discard,errors=remount-ro,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,nosuid,nodev,noexec,relatime) proc on /proc/fs type proc (ro,nosuid,nodev,noexec,relatime) proc on /proc/irq type proc (ro,nosuid,nodev,noexec,relatime) proc on /proc/sys type proc (ro,nosuid,nodev,noexec,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 /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。 ![](https://cdn.isharkfly.com/com-isharkfly-www/discourse-uploads/original/2X/8/860aea77b579cc4581ba7cbfea17889048954556.png) 随着官方对 Docker 容器切换的情况来看，Busybox 对大部分使用 Docker 的人来说可能用不上。 基本上了解下即可。 ## 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 --- https://www.isharkfly.com/t/docker-busybox/15734