i-generationコンテンツ同期手順
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■コンテンツ同期ポリシー
・rsyncで1分間隔で同期
・ソースはweb1→web2への一方向同期とする（双方向同期はファイル競合のリスクがあるため）
・stat系ログファイルはweb2→web1へ同期（運営者管理画面からweb2のログを参照できるようにするため）
・運営者管理画面はweb1へアクセス（画像更新、設定ファイルの更新はweb1のみ）
　http://web1.i-generation.jp/admin/
　.htaccessでhttp://i-generation.jp/admin/はhttp://web1.i-generation.jp/admin/へリダイレクト

■同期対象ディレクトリ
/www/aff/ad/*
/www/aff/admin/*
/www/aff/db/*
/www/aff/home/*
/www/aff/lib/*
/www/aff/mail/*
/www/aff/maintenance/*
/www/aff/set/*
/www/aff/stat/*
/www/aff/sync/*
/www/aff/user/*

■同期対象外ディレクトリ
/www/aff/log/*
/www/aff/stat/log/*
/www/aff/stat/*.log

■rsync設定
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[web1]
rsync用ユーザー作成
$ /usr/sbin/adduser web_sync
$ passwd web_sync
password: Gnxi34C8
$ su - web_sync
$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/web_sync/.ssh/id_rsa): ENTER
Enter passphrase (empty for no passphrase): ENTER
Enter same passphrase again: ENTER
Your identification has been saved in /home/web_sync/.ssh/id_rsa.
Your public key has been saved in /home/web_sync/.ssh/id_rsa.pub.
The key fingerprint is:
19:00:74:dd:ee:b2:fd:6b:49:68:76:27:b8:76:49:bb web_sync@web1.localdomain

$ scp /home/web_sync/.ssh/id_rsa.pub admin@192.168.2.103:/home/admin

$ su -
$ vi /etc/ssh/sshd_config

以下3行コメントはずす
RSAAuthentication yes    <--- SSH v1
PubkeyAuthentication yes    <--- SSH v2
AuthorizedKeysFile      .ssh/authorized_keys

$ /sbin/service sshd restart
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[web2]
$ /usr/sbin/adduser web_sync
$ passwd web_sync
password: Gnxi34C8

$ su - web_sync
$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/web_sync/.ssh/id_rsa): ENTER
Enter passphrase (empty for no passphrase): ENTER
Enter same passphrase again: ENTER
Your identification has been saved in /home/web_sync/.ssh/id_rsa.
Your public key has been saved in /home/web_sync/.ssh/id_rsa.pub.
The key fingerprint is:
19:00:74:dd:ee:b2:fd:6b:49:68:76:27:b8:76:49:bb web_sync@web1.localdomain

$ scp /home/web_sync/.ssh/id_rsa.pub admin@192.168.2.101:/home/admin

web1への接続確認
$ ssh web_sync@192.168.2.101

$ su -
$ vi /etc/ssh/sshd_config

以下3行コメントはずす
RSAAuthentication yes    <--- SSH v1
PubkeyAuthentication yes    <--- SSH v2
AuthorizedKeysFile      .ssh/authorized_keys

$ /sbin/service sshd restart

$ cat /home/admin/id_rsa.pub >> /home/web_sync/.ssh/authorized_keys
$ chown web_sync:web_sync /home/web_sync/.ssh/authorized_keys

$ chown -R web_sync:web_sync /www/aff/

[web1]
$ cat /home/admin/id_rsa.pub >> /home/web_sync/.ssh/authorized_keys
$ chown web_sync:web_sync /home/web_sync/.ssh/authorized_keys
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■同期スクリプトパーミッション設定
[web1]
$ cd /www/aff/sync/
$ chown web_sync:web_sync *.sh
$ chmod 4744 *.sh

■ログ同期用ディレクトリ作成
[web1]
$ mkdir /www/aff/log/web2
$ chmod a+w /www/aff/log/web2

■同期確認
[web1]
$ cd /www/aff/sync/
$ ./content_rsync_test.sh
Agent pid 29373
Enter passphrase for /home/web_sync/.ssh/id_rsa: 
Identity added: /home/web_sync/.ssh/id_rsa (/home/web_sync/.ssh/id_rsa)
building file list ... done
test.txt

sent 90 bytes  received 42 bytes  264.00 bytes/sec
total size is 0  speedup is 0.00
Agent pid 29373 killed

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■初回同期処理
$ cd /www/aff/sync/
$ ./content_rsync_init.sh

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■実運用
[web1]
$crontab -e
* * * * * $WEB_DIR/sync/content_rsync.sh > $WEB_DIR/sync/content_rsync.log 2>&1

[web2]
$crontab -e
stat系以外は全てコメントアウト
* * * * * $WEB_DIR/sync/log_rsync.sh > $WEB_DIR/sync/log_rsync.log 2>&1