April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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236
12 章 Amazon EC2
12.10.1
アクセス可能な
IP
アドレス
セキュリティグループを使うことで、インスタンスに接続できる
IP
アドレスを制限できます。
サブネットは、クラスレスドメイン間ルーティング（
CDIR
）表記で指定します。
例えば、
203.0.113.0/24
は
CIDR
表記で指定されたサブネットの例
†
で、
IP
アドレスの先頭の
24bit
が
203.0.113.0
の先頭の
24bit
に一致しなければならないということを示しています。
/24
の部分は、
/24
で終わる
CIDR
の大きさと呼ばれることもあります。
/24
という値が優れているのは、これが
IP
アドレスの最初の
3
つのオクテット、すなわち
203.0.113
に対応していることです
‡
。これが意味するのは、
203.0.113
で始まる任意の
IP
アドレ
ス、すなわち
203.0.113.0
から
203.0.113.255
の範囲の任意の
IP
アドレスは、このサブネット中
にあるということです。
0.0.0.0/0
を指定した場合は、任意の
IP
アドレスに対して接続を許可したことになります。
12.10.2
セキュリティグループのポート
EC2
のセキュリティグループについて筆者が混乱させられたことの
1
つは、
from_port
と
to_
port
の表記です。
EC2
では、アクセス可能なポートの範囲を指定できます。例えば、以下のよう
に指定することで、
5900
番から
5999
番の任意のポートへの
TCP
接続の許可を指示できます。
- proto: tcp
from_port: ...
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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.