docker runで上げたコンテナに docker-compose upで上げたコンテナをlinkする

なんでそんなことしたかったの
現状
docker runのとき
docker-compose up
実行

なんでそんなことしたかったの

もともとコンテナをitamaeスクリプトでdocker runして立ち上げていた
- オプションが増えてきてコマンドが非常に長くなった
何を書いているのかわかりにくかったのでdocker-compose.ymlにオプションを書いて起動することに

現状

すでに上がっているコンテナ

mariadb
- mysql互換なので
redis
- ログ

CONTAINER ID	IMAGE	COMMAND	CREATED	STATUS	PORTS	NAMES
acb7e507f8e2	mariadb	"docker-entrypoint.s…"	8 days ago	Up 8 days	0.0.0.0:3306->3306/tcp	mariadb_1
a3240056a0a3	redis:4.0.8	"docker-entrypoint.s…"	8 days ago	Up 8 days	0.0.0.0:6379->6379/tcp	redis_1

docker-compose upで上げるコンテナ

javaアプリ
- Spring BootでDBにつないでる
- commandオプションにて起動

docker runのとき

execute "docker build . -t #{NAME}" do
  user 'root'
  cwd ROOM_HOME
end

execute "sudo docker run -d -p 8080:8080 -e TZ=Asia/Tokyo --name #{NAME} --net team_default --link mariadb_1:mysql --link redis_1:redis -v /var/log/app/:/var/log/app/ -v /home/team/app_build/:/home -it #{NAME} java -jar -Dspring.config.location=\"/home/application.yml\" app.jar" do
  user 'root'
  cwd '/home/team'
end

docker-compose up

上をdocker-compose upにする

# Docker-compose実行
execute "sudo docker-compose -f docker-compose.dev.yml build" do
  user 'root'
  cwd ROOM_HOME
end

execute "sudo docker-compose -f docker-compose.dev.yml up -d" do
  user 'root'
  cwd ROOM_HOME
end

docker-compose.dev.yml

version: '2.2'
services:
  app:
    container_name: app
    user: 0:0 #root
    build: .
    image: app
    ports:
      - "8080:8080"
    network_mode: app_default #開発用
    environment:
      - TZ=Asia/Tokyo
    volumes:
      - "/var/log/app/:/var/log/app/"
      - "/home/team/app_build/:/home"
    links:
      - mariadb_1:mysql
      - redis_1:redis
    command: java -jar -Dspring.config.location="/home/application.yml" app.jar


  # external_links:
    #   - mariadb_1:mysql
    # links:
    #   - "mariadb"
    #   - "mariadb:mysql"
    #   - "redis"

実行

これで起動したところmariadbにうまくつながらなかった

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2186)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2219)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2014)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
        at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:310)
        at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:735)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:667)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:482)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:131)
        at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:246)
        ... 21 common frames omitted
Caused by: java.net.UnknownHostException: mysql: Name or service not known
        at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
        at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
        at java.net.InetAddress.getAllByName(InetAddress.java:1192)
        at java.net.InetAddress.getAllByName(InetAddress.java:1126)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:188)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
        ... 43 common frames omitted

外部のコンテナにつなぐにはexternal_linksを使うらしい
https://docs.docker.com/compose/compose-file/compose-file-v2/#external_links

そもそもlinksがレガシーなオプションだから使わないほうがいいらしい
https://docs.docker.com/compose/compose-file/compose-file-v2/#links

linksのところを変えた

# links:
#      - mariadb_1:mysql
#      - redis_1:redis
external_links:
     - "mariadb_1:mysql"
     - "redis_1:redis"

変わらなかった
ドッカーのネットワーク確認

[hoge@appserver ~]$ sudo docker network inspect app_default
[
    {
        "Name": "app_default",
        "Id": "1d8ba01bca9f48859b06e4799ed5b6dc5b1b2a93bb7ab47c2d7e29b5e8c60389",
        "Created": "2018-07-24T18:44:07.49052281+09:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.18.0.0/16",
                    "Gateway": "172.18.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "a3240056a0a32233efe9464e2b88e63f01bbbf10ca6dfb0d33cf97134ef71b69": {
                "Name": "redis_1",
                "EndpointID": "b45d6bab39822687ed2eab70b697952c13680aa29fdbac9d06c827endpointid",
                "MacAddress": "02:42:ac:12:00:02",
                "IPv4Address": "172.18.0.2/16",
                "IPv6Address": ""
            },
            "acb7e507f8e263eea495d53699dcb8f271e621000f2b9c5787d575bd2470317e": {
                "Name": "mariadb_1",
                "EndpointID": "398fd645f3165378d4720d596be713038e287d7f27a898060b684cendpointid",
                "MacAddress": "02:42:ac:12:00:04",
                "IPv4Address": "172.18.0.4/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

同じネットワークには入ってる

hostsに追加してみる
https://docs.docker.com/compose/compose-file/compose-file-v2/#extra_hosts-1

# external_links:
#      - "mariadb_1:mysql"
#      - "redis_1:redis"
extra_hosts:
    - "mysql:172.18.0.4"
    - "redis:172.18.0.2"

今度はうまくDBにつながってくれた
でもDBのコンテナ再起動してip変わってしまったらyaml書き換える必要がありそう
ip直打ちじゃなくしたいですね

参考
https://mag.osdn.jp/17/03/28/190000/2

プログラマのためのDocker教科書第2版インフラの基礎知識&コードによる環境構築の自動化

posted with カエレバ

WINGSプロジェクト阿佐志保翔泳社 2018-04-11