Webアプリケーション on EC2 and RDS
AWSを使ってみた
無償枠でより多くの機能を使ってみたい
とりあえずは基本のEC2とRDSを連携させたWebアプリケーションを構築してみる。
WEB/AP - DBの構成
機能
- ログイン
- データベースに登録されたID/PASSと一致した場合、アカウント一覧画面を表示する
- データベースに登録されたID/PASSと一致しない場合、ログイン画面を再表示して、エラーメッセージを表示する
- アカウント一覧表示
- データベースに登録されたIDを一覧で表示する
- 有効フラグが立っていないIDは表示しない
- アカウント追加
- 入力された情報でデータベースへレコードを追加する
前提
- AWS契約済み
- KeyPair作成済み、ローカルに証明書ファイルがあること
手順
- EC2インスタンス作成
AMIはCentOS7を利用
- RDSインスタンス作成
MySQLを選択
EC2インスタンスと同じVPC、同じSubnetを選択
EC2インスタンスと同じSecurityGroupを選択
DB nameはtestsitedb
- SecurityGroup
Sourceに選択したセキュリティグループ
ポートにRDSのポート番号を入力（今回はMySQLのデフォル3306）
- OSログイン
EC2はコンソール接続はない。
個人的には衝撃の事実
OSのNW系障害が発生したらどうするんだろ。。# ssh -i <証明書> centos@<PublicIP> $ sudo su -
- MySQLクライアントインストール
パッケージインストール# yum install mysql mysql-dev gcc python-devel Loaded plugins: fastestmirror ・・・（略）・・・ Installed: mariadb.x86_64 1:5.5.41-2.el7_0 Dependency Installed: perl.x86_64 4:5.16.3-283.el7 perl-Carp.noarch 0:1.26-244.el7 perl-Encode.x86_64 0:2.51-7.el7 perl-Exporter.noarch 0:5.68-3.el7 perl-File-Path.noarch 0:2.09-2.el7 perl-File-Temp.noarch 0:0.23.01-3.el7 perl-Filter.x86_64 0:1.49-3.el7 perl-Getopt-Long.noarch 0:2.40-2.el7 perl-HTTP-Tiny.noarch 0:0.033-3.el7 perl-PathTools.x86_64 0:3.40-5.el7 perl-Pod-Escapes.noarch 1:1.04-283.el7 perl-Pod-Perldoc.noarch 0:3.20-4.el7 perl-Pod-Simple.noarch 1:3.28-4.el7 perl-Pod-Usage.noarch 0:1.63-3.el7 perl-Scalar-List-Utils.x86_64 0:1.27-248.el7 perl-Socket.x86_64 0:2.010-3.el7 perl-Storable.x86_64 0:2.45-3.el7 perl-Text-ParseWords.noarch 0:3.29-4.el7 perl-Time-Local.noarch 0:1.2300-2.el7 perl-constant.noarch 0:1.27-2.el7 perl-libs.x86_64 4:5.16.3-283.el7 perl-macros.x86_64 4:5.16.3-283.el7 perl-parent.noarch 1:0.225-244.el7 perl-podlators.noarch 0:2.5.1-3.el7 perl-threads.x86_64 0:1.87-4.el7 perl-threads-shared.x86_64 0:1.43-6.el7 Dependency Updated: mariadb-libs.x86_64 1:5.5.41-2.el7_0 Complete!
- 接続試験
# mysql -h <RDS Endpoint> -u <db user> -p Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MySQL connection id is 154 Server version: 5.6.22-log MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
- djangoインストール
# easy_install pip Searching for pip Reading https://pypi.python.org/simple/pip/ Best match: pip 6.0.8 Downloading https://pypi.python.org/packages/source/p/pip/pip-6.0.8.tar.gz#md5=2332e6f97e75ded3bddde0ced01dbda3 Processing pip-6.0.8.tar.gz Writing /tmp/easy_install-hvl4ts/pip-6.0.8/setup.cfg Running pip-6.0.8/setup.py -q bdist_egg --dist-dir /tmp/easy_install-hvl4ts/pip-6.0.8/egg-dist-tmp-UeBzQD warning: no previously-included files found matching '.coveragerc' warning: no previously-included files found matching '.mailmap' warning: no previously-included files found matching '.travis.yml' warning: no previously-included files found matching 'pip/_vendor/Makefile' warning: no previously-included files found matching 'tox.ini' warning: no previously-included files found matching 'dev-requirements.txt' no previously-included directories found matching '.travis' no previously-included directories found matching 'docs/_build' no previously-included directories found matching 'contrib' no previously-included directories found matching 'tasks' no previously-included directories found matching 'tests' Adding pip 6.0.8 to easy-install.pth file Installing pip script to /usr/bin Installing pip2.7 script to /usr/bin Installing pip2 script to /usr/bin Installed /usr/lib/python2.7/site-packages/pip-6.0.8-py2.7.egg Processing dependencies for pip Finished processing dependencies for pip # pip list backports.ssl-match-hostname (3.4.0.2) boto (2.25.0) chardet (2.0.1) Cheetah (2.4.4) cloud-init (0.7.5) configobj (4.7.2) decorator (3.4.0) iniparse (0.4) IPy (0.75) jsonpatch (1.2) jsonpointer (1.0) kitchen (1.1.1) Markdown (2.4.1) Pillow (2.0.0) pip (6.0.8) policycoreutils-default-encoding (0.1) prettytable (0.7.2) pycurl (7.19.0) Pygments (1.4) pygobject (3.8.2) pygpgme (0.3) pyliblzma (0.5.3) pyudev (0.15) pyxattr (0.5.1) PyYAML (3.10) requests (1.1.0) seobject (0.1) sepolicy (1.1) setuptools (0.9.8) six (1.3.0) urlgrabber (3.10) urllib3 (1.5) yum-metadata-parser (1.1.4) [root@ip-172-31-8-41 ~]# pip install django mysql-python Collecting django Downloading Django-1.7.7-py2.py3-none-any.whl (7.4MB) 100% |################################| 7.4MB 74kB/s Installing collected packages: django Successfully installed django-1.7.7 - 動作確認
# django-admin startproject testweb # cd testweb/ # ./manage.py runserver 0.0.0.0:8888 Performing system checks... System check identified no issues (0 silenced). You have unapplied migrations; your app may not work properly until they are applied. Run 'python manage.py migrate' to apply them. March 28, 2015 - 16:39:27 Django version 1.7.7, using settings 'testweb.settings' Starting development server at http://0.0.0.0:8888/ Quit the server with CONTROL-C.
Webブラウザ起動してページへアクセス・・・繋がらない
あ、SecurityGroupで8888ポート開放していない
EC2のSecurityGroupに戻ってMyIPから8888へのアクセス開放もう一回アクセス・・・繋がった
- DB設定
DjangoはデフォルトDB設定がsqlite3を利用する
DBをRDSのDB情報に設定変更する# vi testweb/settings.py 以下を変更 --- DATABASES = { 'default': { 'ENGINE': 'django.db.backends.sqlite3', 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'), } } --- ↓ --- DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'HOST': <RDS Endpoint>, 'PORT': '3306', 'NAME': 'testsitedb', 'USER': 'test', 'PASSWORD': <password>, } } --- # # ./manage.py runserver Traceback (most recent call last): File "./manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line utility.execute() File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute django.setup() File "/usr/lib/python2.7/site-packages/django/__init__.py", line 21, in setup apps.populate(settings.INSTALLED_APPS) File "/usr/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate app_config.import_models(all_models) File "/usr/lib/python2.7/site-packages/django/apps/config.py", line 202, in import_models self.models_module = import_module(models_module_name) File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module __import__(name) File "/usr/lib/python2.7/site-packages/django/contrib/auth/models.py", line 40, in <module> class Permission(models.Model): File "/usr/lib/python2.7/site-packages/django/db/models/base.py", line 122, in __new__ new_class.add_to_class('_meta', Options(meta, **kwargs)) File "/usr/lib/python2.7/site-packages/django/db/models/base.py", line 297, in add_to_class value.contribute_to_class(cls, name) File "/usr/lib/python2.7/site-packages/django/db/models/options.py", line 166, in contribute_to_class self.db_table = truncate_name(self.db_table, connection.ops.max_name_length()) File "/usr/lib/python2.7/site-packages/django/db/__init__.py", line 40, in __getattr__ return getattr(connections[DEFAULT_DB_ALIAS], item) File "/usr/lib/python2.7/site-packages/django/db/utils.py", line 242, in __getitem__ backend = load_backend(db['ENGINE']) File "/usr/lib/python2.7/site-packages/django/db/utils.py", line 108, in load_backend return import_module('%s.base' % backend_name) File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module __import__(name) File "/usr/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 18, in <module> raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e) django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdbMySQLdbモジュールがないらしい
というか色々ないらしい。# yum install mysql-devel gcc python-devel # pip install mysql-python # ./manage.py migrate Operations to perform: Apply all migrations: admin, contenttypes, auth, sessions Running migrations: Applying contenttypes.0001_initial... OK Applying auth.0001_initial... OK Applying admin.0001_initial... OK Applying sessions.0001_initial... OK
なんか色々作られた。
# mysql -h <RDS Endpoint> -u test -p Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MySQL connection id is 167 Server version: 5.6.22-log MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MySQL [(none)]> use testsitedb Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed MySQL [testsitedb]> show tables -> ; +----------------------------+ | Tables_in_testsitedb | +----------------------------+ | auth_group | | auth_group_permissions | | auth_permission | | auth_user | | auth_user_groups | | auth_user_user_permissions | | django_admin_log | | django_content_type | | django_migrations | | django_session | +----------------------------+ 10 rows in set (0.00 sec)データベースにテーブルが作成されていた。
今日はここまで。。
全然出来なかった。
EC2とRDSが連携出来たので目的は達成かな。
