Docker inside Docker based on Alpine Linux

Study from

HTTPS://hub.docker.com/_/docker/

Feeling a word these people really cow B.

Simple test

Pull Mirror

Docker Pull Docker:dind

Run mirror

Docker run-it--privileged--name dind-d docker:dind

View image

[email protected] ~]# Docker exec-it some-Docker SH/# docker Versionclient:version:18.05.0-CE API version:1.37Go version:go1.9.2Git commit:f150324 built:wed May9  A: One: in 2018OS/arch:linux/AMD64 Experimental:falseOrchestrator:swarmServer:Engine:Version:18.05.0-CE API version:1.37(Minimum version1.12) Go version:go1.10.1Git commit:f150324 built:wed May9  A: -: the 2018OS/arch:linux/AMD64 Experimental:false/ #

In fact, you can also view the version information of this machine

vi/etc/os-release NAME="Alpine Linux"ID=alpineversion_id= 3.7. 0 pretty_name="Alpine Linux v3.7"home_url="http ://alpinelinux.org"bug_report_url="http://bugs.alpinelinux.org "

There's a full dockerfile file on GitHub. I've been using CentOS for half a day.

HTTPS://github.com/docker-library/docker/blob/9ecb1c3a6bd766b69eb1858ef721f62fbd930a2b/18.06-rc/ Dind/dockerfile

Content is

From Docker:18.06-rc# https://github.com/docker/docker/blob/master/project/packagers.md#runtime-dependenciesRUNSet-eux; APK Add--no-Cache Btrfs-progs e2fsprogs e2fsprogs-extra iptables xfsprogs XZ # Pigz:https://github.com/moby/moby/pull/35697 (faster gzip implementation)Pigz; # only install ZFSifIt's available for the current architecture# https://git.alpinelinux.org/cgit/aports/tree/main/zfs/apkbuild?h=3.6-stable#n9 ("All!ARMHF!ppc64le" as of 2017-11-01) #"apk Info XYZ"Exits with a zero exit code but no output when the package exists and not for  ThisArchifzfs="$ (apk info--no-cache--quiet ZFS)"&& [-N"$ZFS" ]; Then apk add--no-cache ZFS; fi# TODO Aufs-tools#SetUp Subuid/subgid so"--userns-remap=default"Works out-of-the-BoxrunSet-x&& AddGroup-S Dockremap&& Adduser-s-G dockremap Dockremap&& Echo'dockremap:165536:65536'>>/etc/Subuid&& Echo'dockremap:165536:65536'>>/etc/subgid# https://Github.com/docker/docker/tree/master/hack/dindENV dind_commit 52379fa76dee07ca038624d639d9e14f4fb719ffrunSet-ex; APK Add--no-cache--Virtual. fetch-Deps Libressl; wget-o/usr/local/bin/dind"Https://raw.githubusercontent.com/docker/docker/${dind_commit}/hack/dind"; chmod+x/usr/local/bin/Dind; APK del. Fetch-depscopy Dockerd-entrypoint.sh/usr/local/bin/VOLUME/var/lib/Dockerexpose2375entrypoint ["dockerd-entrypoint.sh"]cmd []

Dockerfile with the Docker part installed

From Alpine:3.7RUN apk Add--no-Cache CA-certificates#SetUp nsswitch.conf forGo'S "Netgo" implementation (which Docker explicitly uses)#-HTTPS://github.com/docker/docker-ce/blob/v17.09.0-ce/components/engine/hack/make.sh#l149#-HTTPS://github.com/golang/go/blob/go1.9.1/src/net/conf.go#l194-l275#-Docker run--RM debian:stretch grep'^hosts:'/etc/Nsswitch.confrun [! -E/ETC/NSSWITCH.CONF] && Echo'hosts:files DNS'>/etc/nsswitch.confenv docker_channel testenv docker_version18.06.0-ce-rc3# TODO ENV docker_sha256# https://Github.com/docker/docker-ce/blob/5b073ee2cf564edee5adca05eee574142f7627bb/components/packaging/static/hash _files !# (no SHA file artifacts on download.docker.com yet asOf .- .- -though) RUNSet-ex; # Why we use"Curl"Instead of"wget":# + Wget-o docker.tgz https://download.docker.com/linux/static/stable/x86_64/docker-17.03.1-ce.tgz# Connecting to Download.docker.com (54.230.87.253:443) # Wget:error getting response:connection Reset by peer apk add--no-cache--Virtual. fetch-Deps Curl Tar; #  This " Case"Statement isGenerated via"update.sh"Apkarch="$ (apk--print-arch)";  Case "$apkArch" inchx86_64) Dockerarch='x86_64' ;; ARMHF) Dockerarch='Armel' ;; AARCH64) Dockerarch='aarch64' ;; Ppc64le) Dockerarch='Ppc64le' ;; S390X) Dockerarch='s390x' ;; *) echo >&2 "error:unsupported Architecture ($apkArch)"; Exit1 ;;         Esac if! Curl-fl-o docker.tgz"https://download.docker.com/linux/static/${docker_channel}/${dockerarch}/docker-${docker_version}.tgz"; then echo>&2 "error:failed to download ' docker-${docker_version} ' from ' ${docker_channel} ' for ' ${dockerarch} '"; Exit1;         Fi Tar--Extract--file Docker.tgz--strip-components1         --directory/usr/local/bin/     ;         RM docker.tgz; APK del. Fetch-Deps; Dockerd-v; Docker-vcopy modprobe.sh/usr/local/bin/Modprobecopy Docker-entrypoint.sh/usr/local/bin/entrypoint ["docker-entrypoint.sh"]cmd ["SH"]

Docker inside Docker based on Alpine Linux