■設計のセオリー（ベストプラクティス、ロールモデル、セオリー）
コンテナ部分の意識する設計
デプロイに必要な「設定情報」
ドラブル時の調査に必要な「ロギング」
正常なサービス継続や内部状態を知るための「監視」
コンテナ設計ガイドライン
Beyond the Twelve-Factor App
コンテナベース・アプリケーションの設計原則（Red Hat）
設定情報の管理方法（クラウドベンダによる設定情報の外部管理サービス）
AWS System Manager Parameter Store
AWS Secrets Manager
Google Cloud Secret Manager
監視
アプリケーションの起動確認
Mackerelなどの監視SaaSからの外形監視
Application Load Balancerなどからのヘルスチェック
コンテナオーケストレーションによるコンテナ制御
Docker Compose・・複数のコンテナ環境を一括管理する。
⇒試しに使ってみた。
Docker-Composeのバージョン
V1・・ネットワークやボリュームに非対応
V2・・↑に対応
V3・・Swarmモードを使わない、dockerstakによるオーケストレーションに対応
Awesame Compose（asesameオーサム、素晴らしい、最高、すごい）
Docker Composeの素晴らしいサンプル集
⇒asp.net+MySQLを見たがたいした情報は得られなかった。
Docker Compose vs Swarmモード・・最近は差が少なくなってきている。
Swarmモード vs Kubernetes・・K8Sは、複数のネットワーク空間を分離でき、数百台以上のノードを扱えるより大規模に向いている。
Volumesの書式とデータ永続化の方法
書式 | データの永続化の方法 | 例 |
ホストディレクトリ：コンテナディレクトリ | バインドマウント | /ops/data:/var/lib/mysql |
データボリューム名：コンテナディレクトリ | 名前付きボリューム | mysql_data:/var/lib/mysql |
コンテナディレクトリ | 匿名ボリューム | /var/lib/mysql |
有益な情報
★docker runコマンドに-eオプションで環境変数を渡す
docker run -it --name container-design-app -e MAIN_DB_HOST=db.example.privaete -e MAIN_DB_PORT=3306 -e MAIN_DB_NAME=sample_db -e MAIN_DB_PASSWORD=sample_password -d container-design-app:latest
⇒動作するアプリケーションには、GitのCommit Hashを渡す。
実際にやってみた
Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.
新しいクロスプラットフォームの PowerShell をお試しください https://aka.ms/pscore6
PS C:\Users\kiyotaka> docker-compose version
docker-compose version 1.27.4, build 40524192
docker-py version: 4.3.1
CPython version: 3.7.4
OpenSSL version: OpenSSL 1.1.1c 28 May 2019
PS C:\Users\kiyotaka> docker version
Client: Docker Engine - Community
Cloud integration: 1.0.4
Version: 20.10.2
API version: 1.41
Go version: go1.13.15
Git commit: 2291f61
Built: Mon Dec 28 16:14:16 2020
OS/Arch: windows/amd64
Context: default
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 20.10.2
API version: 1.41 (minimum version 1.12)
Go version: go1.13.15
Git commit: 8891c58
Built: Mon Dec 28 16:15:23 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.4.3
GitCommit: 269548fa27e0089a8b8278fc4fc781d7f65a939b
runc:
Version: 1.0.0-rc92
GitCommit: ff819c7e9184c13b7c2607fe6c30ae19403a7aff
docker-init:
Version: 0.19.0
GitCommit: de40ad0
PS C:\dev\sample_gomi> cd .\20210117_DockerWordPressMySQL\
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL> ls
ディレクトリ: C:\dev\sample_gomi\20210117_DockerWordPressMySQL
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 2021/01/17 12:13 691 docker-compose.yml
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL> docker-compose up -d
Creating network "20210117_dockerwordpressmysql_default" with the default driver
Creating volume "20210117_dockerwordpressmysql_wordpress_data" with default driver
Creating volume "20210117_dockerwordpressmysql_db_data" with default driver
Pulling db (mysql:5.7)...
5.7: Pulling from library/mysql
a076a628af6f: Pull complete
f6c208f3f991: Pull complete
88a9455a9165: Pull complete
406c9b8427c6: Pull complete
7c88599c0b25: Pull complete
25b5c6debdaf: Pull complete
43a5816f1617: Pull complete
7065aaa2655f: Pull complete
b4bc531db40f: Pull complete
8c3e9d7c9815: Pull complete
fadfb9734ed2: Pull complete
Digest: sha256:e08834258fcc0efd01df358222333919df53d4a0d9b2a54da05b204b822e3b7b
Status: Downloaded newer image for mysql:5.7
Pulling wordpress (wordpress:latest)...
latest: Pulling from library/wordpress
a076a628af6f: Already exists
02bab8795938: Pull complete
657d9d2c68b9: Pull complete
f47b5ee58e91: Pull complete
2b62153f094c: Pull complete
60b09083723b: Pull complete
1701d4d0a478: Pull complete
bae0c4dc63ea: Pull complete
a1c05958a901: Pull complete
5964d339be93: Pull complete
17c19430ed9f: Pull complete
1c16920b970c: Pull complete
1fab8f583d66: Pull complete
473b1e99afb3: Pull complete
7319f9ced717: Pull complete
0fde4d7f1f2c: Pull complete
b8ec91c53cb2: Pull complete
c157b7dc82cb: Pull complete
ffcbbf85de97: Pull complete
426d16d4eb4f: Pull complete
Digest: sha256:2d5f306e039a637bd86d9d1cfc1b465c987898e2784e4279754b9d3c2737121b
Status: Downloaded newer image for wordpress:latest
Creating 20210117_dockerwordpressmysql_db_1 ... done
Creating 20210117_dockerwordpressmysql_wordpress_1 ... done
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL> docker-compose ps
Name Command State Ports
---------------------------------------------------------------------------------------------------------
20210117_dockerwordpressmysql_db_1 docker-entrypoint.sh mysqld Up 3306/tcp, 33060/tcp
20210117_dockerwordpressmysql_wordpress_1 docker-entrypoint.sh apach ... Up 0.0.0.0:8080->80/tcp
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL> docker-compose logs -f --tail 10
Attaching to 20210117_dockerwordpressmysql_wordpress_1, 20210117_dockerwordpressmysql_db_1
db_1 | 2021-01-17T03:16:36.953753Z 0 [Warning] CA certificate ca.pem is self signed.
db_1 | 2021-01-17T03:16:36.953848Z 0 [Note] Skipping generation of RSA key pair as key files are present in data directory.
db_1 | 2021-01-17T03:16:36.954749Z 0 [Note] Server hostname (bind-address): '*'; port: 3306
db_1 | 2021-01-17T03:16:36.955885Z 0 [Note] IPv6 is available.
db_1 | 2021-01-17T03:16:36.956025Z 0 [Note] - '::' resolves to '::';
db_1 | 2021-01-17T03:16:36.956080Z 0 [Note] Server socket created on IP: '::'.
db_1 | 2021-01-17T03:16:36.962765Z 0 [Warning] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.
db_1 | 2021-01-17T03:16:36.978063Z 0 [Note] Event Scheduler: Loaded 0 events
db_1 | 2021-01-17T03:16:36.978625Z 0 [Note] mysqld: ready for connections.
db_1 | Version: '5.7.32' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server (GPL)
wordpress_1 |
wordpress_1 | MySQL Connection Error: (2002) Connection refused
wordpress_1 |
wordpress_1 | MySQL Connection Error: (2002) Connection refused
wordpress_1 |
wordpress_1 | MySQL Connection Error: (2002) Connection refused
wordpress_1 | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.18.0.3. Set the 'ServerName' directive globally to suppress this message
wordpress_1 | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.18.0.3. Set the 'ServerName' directive globally to suppress this message
wordpress_1 | [Sun Jan 17 03:16:38.725211 2021] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.38 (Debian) PHP/7.4.14 configured -- resuming normal operations
wordpress_1 | [Sun Jan 17 03:16:38.725378 2021] [core:notice] [pid 1] AH00094: Command line: 'apache2 -D FOREGROUND'
ERROR: Aborting.
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL> docker network ls
NETWORK ID NAME DRIVER SCOPE
3a2e2da02f30 20210117_dockerwordpressmysql_default bridge local
5a1461676fb7 bridge bridge local
03206456c01a host host local
b1cd822f350c none null local
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL> docker volume ls
DRIVER VOLUME NAME
local 20210117_dockerwordpressmysql_db_data
local 20210117_dockerwordpressmysql_wordpress_data
local 96778665e1140bb21c2b90510009db9f54dd2b495a8f7728a1bf15b638959f42
local myvol
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL> docker-compose down -v ・・・-vボリューム削除
Stopping 20210117_dockerwordpressmysql_wordpress_1 ... done
Stopping 20210117_dockerwordpressmysql_db_1 ... done
Removing 20210117_dockerwordpressmysql_wordpress_1 ... done
Removing 20210117_dockerwordpressmysql_db_1 ... done
Removing network 20210117_dockerwordpressmysql_default
Removing volume 20210117_dockerwordpressmysql_wordpress_data
Removing volume 20210117_dockerwordpressmysql_db_data
PS C:\dev\sample_gomi\20210117_DockerWordPressMySQL>
■ついでに.NET Core+MySQLもやってみた。
初回の起動について
PS C:\dev\sample_gomi\20210117_DockerASP.NETMySQL> docker-compose up -d
Creating network "20210117_dockeraspnetmysql_default" with the default driver
Building web
Step 1/12 : FROM mcr.microsoft.com/dotnet/core/sdk:2.1 AS build
2.1: Pulling from dotnet/core/sdk
2587235a7635: Pull complete
953fe5c215cb: Pull complete
d4d3f270c7de: Pull complete
ed36dafe30e3: Pull complete
cbd152e08112: Pull complete
a3b01e7d05dc: Pull complete
d44dabb4b917: Pull complete
Digest: sha256:8bb207493e4e79ad5a7ed5f3c834f4792d6013100f89889126344c3543d98584
Status: Downloaded newer image for mcr.microsoft.com/dotnet/core/sdk:2.1
---> 69d571ddbbec
Step 2/12 : WORKDIR /app
---> Running in ad9a7a3e3512
Removing intermediate container ad9a7a3e3512
---> 923165acf1f5
Step 3/12 : COPY *.sln .
---> aadeede3665c
Step 4/12 : COPY aspnetapp/*.csproj ./aspnetapp/
---> 13ecdf0949a4
Step 5/12 : RUN dotnet restore
---> Running in 42c13f96b94c
Restore completed in 4.36 sec for /app/aspnetapp/aspnetapp.csproj.
Removing intermediate container 42c13f96b94c
---> b2103339448e
Step 6/12 : COPY aspnetapp/. ./aspnetapp/
---> e53a42255f60
Step 7/12 : WORKDIR /app/aspnetapp
---> Running in 47f93b0550ac
Removing intermediate container 47f93b0550ac
---> 5fc479eb8541
Step 8/12 : RUN dotnet publish -c Release -o out
---> Running in 5700de775d46
Microsoft (R) Build Engine version 16.2.37902+b5aaefc9f for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.
Restore completed in 138.68 ms for /app/aspnetapp/aspnetapp.csproj.
aspnetapp -> /app/aspnetapp/bin/Release/netcoreapp2.1/aspnetapp.dll
aspnetapp -> /app/aspnetapp/bin/Release/netcoreapp2.1/aspnetapp.Views.dll
aspnetapp -> /app/aspnetapp/out/
Removing intermediate container 5700de775d46
---> f2c2760f0d70
Step 9/12 : FROM mcr.microsoft.com/dotnet/core/aspnet:2.1 AS runtime
2.1: Pulling from dotnet/core/aspnet
8aff230071c9: Pull complete
bf20f79c691a: Pull complete
26c37aa54a58: Pull complete
1be7d4556892: Pull complete
Digest: sha256:c6abe7059b096c890700ae3a31f4452dc27ee4135c82040ec14ecfc233a35d7b
Status: Downloaded newer image for mcr.microsoft.com/dotnet/core/aspnet:2.1
---> 7685a653f837
Step 10/12 : WORKDIR /app
---> Running in d4870ed5cb53
Removing intermediate container d4870ed5cb53
---> 7db49484834a
Step 11/12 : COPY --from=build /app/aspnetapp/out ./
---> a6a04b382155
Step 12/12 : ENTRYPOINT ["dotnet", "aspnetapp.dll"]
---> Running in da90c40031cc
Removing intermediate container da90c40031cc
---> 78ff25732e44
Successfully built 78ff25732e44
Successfully tagged 20210117_dockeraspnetmysql_web:latest
WARNING: Image for service web was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Pulling db (microsoft/mssql-server-linux:)...
latest: Pulling from microsoft/mssql-server-linux
59ab41dd721a: Pull complete
57da90bec92c: Pull complete
06fe57530625: Pull complete
5a6315cba1ff: Pull complete
739f58768b3f: Pull complete
0b751601bca3: Pull complete
bcf04a22644a: Pull complete
6b5009e4f470: Pull complete
a9dca2f6722a: Pull complete
Digest: sha256:9b700672670bb3db4b212e8aef841ca79eb2fce7d5975a5ce35b7129a9b90ec0
Status: Downloaded newer image for microsoft/mssql-server-linux:latest
Creating 20210117_dockeraspnetmysql_web_1 ... done
Creating 20210117_dockeraspnetmysql_db_1 ... done
アプリの入れ替えについて
PS C:\dev\sample_gomi\20210117_DockerASP.NETMySQL> docker-compose build
db uses an image, skipping
Building web
Step 1/12 : FROM mcr.microsoft.com/dotnet/core/sdk:2.1 AS build
---> 69d571ddbbec
Step 2/12 : WORKDIR /app
---> Using cache
---> 923165acf1f5
Step 3/12 : COPY *.sln .
---> Using cache
---> aadeede3665c
Step 4/12 : COPY aspnetapp/*.csproj ./aspnetapp/
---> Using cache
---> 13ecdf0949a4
Step 5/12 : RUN dotnet restore
---> Using cache
---> b2103339448e
Step 6/12 : COPY aspnetapp/. ./aspnetapp/
---> 44bfdf470986
Step 7/12 : WORKDIR /app/aspnetapp
---> Running in 8c5cec9ef958
Removing intermediate container 8c5cec9ef958
---> b78ce01684f4
Step 8/12 : RUN dotnet publish -c Release -o out
---> Running in c5449475307b
Microsoft (R) Build Engine version 16.2.37902+b5aaefc9f for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.
Restore completed in 3.2 sec for /app/aspnetapp/aspnetapp.csproj.
aspnetapp -> /app/aspnetapp/bin/Release/netcoreapp2.1/aspnetapp.dll
aspnetapp -> /app/aspnetapp/bin/Release/netcoreapp2.1/aspnetapp.Views.dll
aspnetapp -> /app/aspnetapp/out/
Removing intermediate container c5449475307b
---> 561dd4511eac
Step 9/12 : FROM mcr.microsoft.com/dotnet/core/aspnet:2.1 AS runtime
---> 7685a653f837
Step 10/12 : WORKDIR /app
---> Using cache
---> 7db49484834a
Step 11/12 : COPY --from=build /app/aspnetapp/out ./
---> 0ed89799623d
Step 12/12 : ENTRYPOINT ["dotnet", "aspnetapp.dll"]
---> Running in f84f899bdf2f
Removing intermediate container f84f899bdf2f
---> 1420a6a3101e
Successfully built 1420a6a3101e
Successfully tagged 20210117_dockeraspnetmysql_web:latest
PS C:\dev\sample_gomi\20210117_DockerASP.NETMySQL> docker-compose down
Stopping 20210117_dockeraspnetmysql_web_1 ... done
Stopping 20210117_dockeraspnetmysql_db_1 ... done
Removing 20210117_dockeraspnetmysql_web_1 ... done
Removing 20210117_dockeraspnetmysql_db_1 ... done
Removing network 20210117_dockeraspnetmysql_default
PS C:\dev\sample_gomi\20210117_DockerASP.NETMySQL> docker-compose up -d
Creating network "20210117_dockeraspnetmysql_default" with the default driver
Creating 20210117_dockeraspnetmysql_web_1 ... done
Creating 20210117_dockeraspnetmysql_db_1 ... done
PS C:\dev\sample_gomi\20210117_DockerASP.NETMySQL>
↓ソースを変更してHogeHogeを追加。
