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Let's Encrypt のワイルドカード証明書を取得して、rancherに設定する

Last updated at 2019-05-23Posted at 2019-05-23

最初に

この記事は、備忘録です。

Let’s Encryptがワルドカード証明に対応するのを待ちわびていたことをふと思い出したので、開発環境のRancher環境ように取得して、設定してみたというものです。

環境

サクッと試したかったので、Ubuntu16.04コンテナで取得しました。

DNS：AuzreのDNS
コンテナ：手元のMacの上

手順

参考にした記事によると、公式では「dns-plugin」を使うと書いてありますが、~~面倒なので~~元記事と同じく手動で取得しました。

証明書の取得

CertBot環境を作る。と言っても、使い捨てのコンテナだけど。

❯ docker run -it --rm ubuntu:16.04  bash                                                                                  
root@ad7f41c5773c:/# apt update
・・・
Building dependency tree       
Reading state information... Done
2 packages can be upgraded. Run 'apt list --upgradable' to see them.
root@ad7f41c5773c:/# apt upgrade ＜ 念のため。。。
Reading package lists... Done
・・・
root@ad7f41c5773c:/# apt install certbot ＜ここからが本番
・・・
Get:49 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 certbot all 0.23.0-1~ubuntu16.04.1 [17.4 kB]              
Fetched 16.0 MB in 17s (932 kB/s)                                                                                               
E: Failed to fetch http://61.26.74.210:80/pdata/07e41ece3becb885/archive.ubuntu.com/ubuntu/pool/main/p/python-pbr/python-pbr_1.8.0-4ubuntu1_all.deb  Writing more data than expected (15617 > 12552)

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
root@ad7f41c5773c:/# apt install --fix-missing certbot ＜再度
・・・
148 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done. 
root@ad7f41c5773c:/# certbot --version
certbot 0.23.0　＜ 0.22.0以上なので大丈夫

証明書の取得


root@ad7f41c5773c:/# certbot certonly --manual --preferred-challenges dns -d *.[自分のドメイン] --server https://acme-v02.api.letsencrypt.org/directory
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): [自分のメールアドレス。期限切れ通知が届くので良く見るやつにしないと痛い目見ます]
Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org

-------------------------------------------------------------------------------
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
-------------------------------------------------------------------------------
(A)gree/(C)ancel: A

-------------------------------------------------------------------------------
Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about EFF and
our work to encrypt the web, protect its users and defend digital rights.
-------------------------------------------------------------------------------
(Y)es/(N)o: Y
Starting new HTTPS connection (1): supporters.eff.org
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for [自分のドメインが表示される]

-------------------------------------------------------------------------------
NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you're running certbot in manual mode on a machine that is not
your server, please ensure you're okay with that.

Are you OK with your IP being logged?
-------------------------------------------------------------------------------
(Y)es/(N)o: 
(Y)es/(N)o: Y

-------------------------------------------------------------------------------
Please deploy a DNS TXT record under the name
_acme-challenge.[自分のドメインが表示される] with the following value:

xxxxxxxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxx-x

Before continuing, verify the record is deployed.
-------------------------------------------------------------------------------
Press Enter to Continue  < 自分のDNSに上記のテキストレコード追加するまでEnterは触らない。
Waiting for verification...
Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/[自分のドメイン]/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/[自分のドメイン]/privkey.pem
   Your cert will expire on 2019-08-21. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot
   again. To non-interactively renew *all* of your certificates, run
   "certbot renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

root@ad7f41c5773c:/# cd /etc/letsencrypt/live/
root@ad7f41c5773c:/etc/letsencrypt/live# ll
total 12
drwx------ 3 root root 4096 May 23 13:14 ./
drwxr-xr-x 9 root root 4096 May 23 13:14 ../
drwxr-xr-x 2 root root 4096 May 23 13:14 [自分のドメイン]/
root@ad7f41c5773c:/etc/letsencrypt/live# cd [自分のドメイン]/
root@ad7f41c5773c:/etc/letsencrypt/live/[自分のドメイン]# ll
total 12
drwxr-xr-x 2 root root 4096 May 23 13:14 ./
drwx------ 3 root root 4096 May 23 13:14 ../
-rw-r--r-- 1 root root  543 May 23 13:14 README
lrwxrwxrwx 1 root root   39 May 23 13:14 cert.pem -> ../../archive/[自分のドメイン]/cert1.pem
lrwxrwxrwx 1 root root   40 May 23 13:14 chain.pem -> ../../archive/[自分のドメイン]/chain1.pem
lrwxrwxrwx 1 root root   44 May 23 13:14 fullchain.pem -> ../../archive/[自分のドメイン]/fullchain1.pem
lrwxrwxrwx 1 root root   42 May 23 13:14 privkey.pem -> ../../archive/[自分のドメイン]/privkey1.pem