無料SSLで有名なLet’s encryptを、利用させて頂いており、
それの有効期限3ヶ月と短く、その有効期限が迫ったので、更新対応した際のメモ

導入はほぼ200％こちらのサイト様を参考にさせていただきましたm( _ _ ; )m
http://qiita.com/sak_2/items/ff835b669c0a7e110b09

そもそも自動化しろよって話ですが、
手動で更新した際のメモｗ

1. 恐らく導入時に使ったletsencrypt-autoというファイルを探す。

2. 生成したキーファイル類を確認しておく、必要であればバックアップも

$ cd /etc/letsencrypt/live/blog.4star.link/
cert.pem       chain.pem      fullchain.pem  privkey.pem    

3. それぞれのpemファイルがシンボリックで参照されているので、それがnginxで設定しているファイルと同じか確認

cert.pem -> ../../archive/blog.4star.link/cert1.pem
chain.pem -> ../../archive/blog.4star.link/chain1.pem
fullchain.pem -> ../../archive/blog.4star.link/fullchain1.pem
privkey.pem -> ../../archive/blog.4star.link/privkey1.pem

4. で1.のコマンド実行し更新！

$ ./letsencrypt-auto renew

エラーがでた

$ ./letsencrypt-auto renew
Saving debug log to /var/log/letsencrypt/letsencrypt.log

-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/blog.4star.link.conf
-------------------------------------------------------------------------------
Cert is due for renewal, auto-renewing...
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for blog.4star.link

-------------------------------------------------------------------------------
Port 443 is already in use by another process. This will prevent us from binding
to that port. Please stop the process that is populating the port in question
and try again.  For automated renewal, you may want to use a script that stops
and starts your webserver. You can find an example at
https://certbot.eff.org/docs/using.html#renewal . Alternatively you can use the
webroot plugin to renew without needing to stop and start your webserver.
-------------------------------------------------------------------------------
Cleaning up challenges
Attempting to renew cert from /etc/letsencrypt/renewal/blog.4star.link.conf produced an unexpected error: At least one of the (possibly) required ports is already taken.. Skipping.

All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/blog.4star.link/fullchain.pem (failure)
1 renew failure(s), 0 parse failure(s)

必要なポートが既に使われているらしい。

ポートチェック

$ netstat -tanplsof -i:80

nginxで使っているので一旦停止（サービスが止まるので注意！

$ service nginx stop

再びrenew!

$ ./letsencrypt-auto renew
Saving debug log to /var/log/letsencrypt/letsencrypt.log

-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/blog.4star.link.conf
-------------------------------------------------------------------------------
Cert is due for renewal, auto-renewing...
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for blog.4star.link

-------------------------------------------------------------------------------
Port 443 is already in use by another process. This will prevent us from binding
to that port. Please stop the process that is populating the port in question
and try again.  For automated renewal, you may want to use a script that stops
and starts your webserver. You can find an example at
https://certbot.eff.org/docs/using.html#renewal . Alternatively you can use the
webroot plugin to renew without needing to stop and start your webserver.
-------------------------------------------------------------------------------
Cleaning up challenges
Attempting to renew cert from /etc/letsencrypt/renewal/blog.4star.link.conf produced an unexpected error: At least one of the (possibly) required ports is already taken.. Skipping.

All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/blog.4star.link/fullchain.pem (failure)
1 renew failure(s), 0 parse failure(s)

また同じエラーが。。。

さらにもう一回！

どりゃっっｘさらにもう一回！

ぐああーーっしゃいさらにもう１っかい！

。。。。

。。。。。

何度か同じエラーがでたあと、

$ ./letsencrypt-auto renew
Saving debug log to /var/log/letsencrypt/letsencrypt.log

-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/blog.4star.link.conf
-------------------------------------------------------------------------------
Cert is due for renewal, auto-renewing...
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for blog.4star.link
Waiting for verification...
Cleaning up challenges
Generating key (2048 bits): /etc/letsencrypt/keys/0001_key-certbot.pem
Creating CSR: /etc/letsencrypt/csr/0001_csr-certbot.pem

-------------------------------------------------------------------------------
new certificate deployed without reload, fullchain is
/etc/letsencrypt/live/blog.4star.link/fullchain.pem
-------------------------------------------------------------------------------

Congratulations, all renewals succeeded. The following certs have been renewed:
  /etc/letsencrypt/live/blog.4star.link/fullchain.pem (success)

成功ーーーーーーー！

最高ーーーーーーー！

わっほい！

で

$ service nginx start 

証明書が更新されていない。。。。

生成されたpemファイルをチェック。。。

pemが複数連番になってつくられている、、

/archive/blog.4star.link/cert1.pem
/archive/blog.4star.link/cert2.pem

僕の場合archiveのファイルをnginx.confに指定していたので、
生成された番号のつきの名前の方を変更。。
人力でファイルを変更。。。ｗ

nginx.conf

ssl_certificate /etc/letsencrypt/archive/blog.4star.link/fullchain**2**.pem;
ssl_certificate_key /etc/letsencrypt/archive/blog.4star.link/privkey**2**.pem;
ssl_trusted_certificate /etc/letsencrypt/archive/blog.4star.link/fullchain**2**.pem;

あとは、

せいや。。。！！！！

$ service nginx start

成功done!