August 2016
Intermediate to advanced
384 pages
9h 20m
Japanese
Content preview from Docker
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317
13.6 イメージの起源
署名されていないイメージを使っている場合でも、名前とタグを使ってダイジェストをプルする
ことによって、イメージを検証することができます。例をご覧ください。
$ docker pull debian@sha256:f43366bc755696485050ce14e1429c481b6f0ca04505c4a3093d\
fdb4fafb899e
これで、本書の執筆時点での
debian:jessie
のイメージがプルされます。
debian:jessie
タグと
は異なり、厳密に同じイメージがプルされることが、常に保障されます（あるいはまったくプル
されません）。何らかの形でダイジェストがセキュアに転送され、認証されるのであれば（例えば
PGP
で署名された、信頼された側からメールによる送信など）、そのイメージが本物であることは
保障できます。
content trust
が有効になっている場合であっても、ダイジェストでのプルは可能
です。
イメージを配布する上で、プライベートレジストリや
Docker Hub
を信頼しないのであれば、
docker load
及び
docker save
コマンドを使ってイメージのエクスポートとインポートを行うこと
はいつでもできます。そのイメージは、内部的なダウンロードサイトで配布したり、単純にファ
イルとしてコピーしたりすることができます。ただし言うまでもなく、この方法を採るなら、
Docker
レジストリと
content trust
の構成要素が持つ機能の多くを、再現しなければならないこ ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.