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completing docker compose chapter
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‎attendees/docker-compose.yml‎

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mysqldb:
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image: mysql
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environment:
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MYSQL_DATABASE: sample
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MYSQL_USER: mysql
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MYSQL_PASSWORD: mysql
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MYSQL_ROOT_PASSWORD: supersecret
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mywildfly:
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image: arungupta/wildfly-mysql-javaee7
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links:
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- mysqldb:db
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‎chapters/docker-compose.adoc‎

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[quote, github.com/docker/compose]
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Docker Compose is a tool for defining and running complex applications with Docker. With Compose, you define a multi-container application in a single file, then spin your application up in a single command which does everything that needs to be done to get it running.
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Docker Compose script is only downloadable for OSX and Linux.
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An application using Docker containers will typically consist of multiple containers. With Docker Compose, there is no need to write shell scripts to start your containers. All the containers are defined in a configuration file using _services_, and then `docker-compose` script is used to start, stop, and restart the application and all the services in that application, and all the containers within that service. The complete list of commands is:
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TODO: What are the exact steps to get it running on Windows?
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[options="header"]
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|====
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| Command | Purpose
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| `build` | Build or rebuild services
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| `help` | Get help on a command
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| `kill` | Kill containers
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| `logs` | View output from containers
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| `port` | Print the public port for a port binding
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| `ps` | List containers
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| `pull` | Pulls service images
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| `restart` | Restart services
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| `rm` | Remove stopped containers
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| `run` | Run a one-off command
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| `scale` | Set number of containers for a service
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| `start` | Start services
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| `stop` | Stop services
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| `up` | Create and start containers
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| `migrate-to-labels Recreate containers to add labels
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|====
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Multiple containers, as in <<JavaEE_Application_Docker_Cluster>> can be easily started using Docker Compose, or Compose for short.
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Docker Compose script is only available for OSX and Linux. https://github.com/arun-gupta/docker-java/issues/3 is used for tracking Docker Compose on Windows.
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If you have some additional time, you can take this part of the lab:
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### Configuration File
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. Entry point to Compose is `docker-compose.yml`. Lets use the following file:
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[source, yml]
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----
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mysqldb:
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image: dockerhost:5000/mysql
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environment:
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MYSQL_DATABASE: sample
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MYSQL_USER: mysql
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MYSQL_PASSWORD: mysql
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MYSQL_ROOT_PASSWORD: supersecret
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mywildfly:
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image: dockerhost:5000/arungupta/wildfly-mysql-javaee7
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links:
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- mysqldb:db
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ports:
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- 8080:8080
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----
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This file is available in link:../attendees/docker-compose.yml[] and shows:
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.. Two services are defined by the name `mysqldb` and `mywildfly`
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.. Image name for each service is defined using `image`
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.. Environment variables for the MySQL container are defined in `environment`
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.. MySQL container is linked with WildFly container using `links`
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.. Port forwarding is achieved using `ports`
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### Start Services
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. All the services can be started, in detached mode, by giving the command:
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docker-compose up -d
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And this shows the output as:
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Creating attendees_mysqldb_1...
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Creating attendees_mywildfly_1...
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An alternate compose file name can be specified using `-f`.
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An alternate directory where the compose file exists can be specified using `-p`.
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. Started services can be verified as:
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[source, text]
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----
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> docker-compose ps
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Name Command State Ports
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-------------------------------------------------------------------------------------------------
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attendees_mysqldb_1 /entrypoint.sh mysqld Up 3306/tcp
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attendees_mywildfly_1 /opt/jboss/wildfly/customi ... Up 0.0.0.0:8080->8080/tcp, 9990/tcp
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----
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This provides a consolidated view of all the services started, and containers within them.
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Alternatively, the containers in this application, and any additional containers running on this Docker host can be verified by using the usual `docker ps` command:
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[source, text]
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----
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> docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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3598e545bd2f arungupta/wildfly-mysql-javaee7:latest "/opt/jboss/wildfly/ 59 seconds ago Up 58 seconds 0.0.0.0:8080->8080/tcp, 9990/tcp attendees_mywildfly_1
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b8cf6a3d518b mysql:latest "/entrypoint.sh mysq 2 minutes ago Up 2 minutes 3306/tcp attendees_mysqldb_1
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----
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. Service logs can be seen as:
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[source, text]
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----
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> docker-compose logs
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Attaching to attendees_mywildfly_1, attendees_mysqldb_1
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mywildfly_1 | => Starting WildFly server
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mywildfly_1 | => Waiting for the server to boot
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mywildfly_1 | =========================================================================
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mywildfly_1 |
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mywildfly_1 | JBoss Bootstrap Environment
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mywildfly_1 |
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mywildfly_1 | JBOSS_HOME: /opt/jboss/wildfly
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mywildfly_1 |
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mywildfly_1 | JAVA: /usr/lib/jvm/java/bin/java
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mywildfly_1 |
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mywildfly_1 | JAVA_OPTS: -server -Xms64m -Xmx512m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true
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mywildfly_1 |
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. . .
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mywildfly_1 | 15:40:20,866 INFO [org.jboss.resteasy.spi.ResteasyDeployment] (MSC service thread 1-2) Deploying javax.ws.rs.core.Application: class org.javaee7.samples.employees.MyApplication
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mywildfly_1 | 15:40:20,914 INFO [org.wildfly.extension.undertow] (MSC service thread 1-2) JBAS017534: Registered web context: /employees
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mywildfly_1 | 15:40:21,032 INFO [org.jboss.as.server] (ServerService Thread Pool -- 28) JBAS018559: Deployed "employees.war" (runtime-name : "employees.war")
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mywildfly_1 | 15:40:21,077 INFO [org.jboss.as] (Controller Boot Thread) JBAS015961: Http management interface listening on http://127.0.0.1:9990/management
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mywildfly_1 | 15:40:21,077 INFO [org.jboss.as] (Controller Boot Thread) JBAS015951: Admin console listening on http://127.0.0.1:9990
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mywildfly_1 | 15:40:21,077 INFO [org.jboss.as] (Controller Boot Thread) JBAS015874: WildFly 8.2.0.Final "Tweek" started in 9572ms - Started 280 of 334 services (92 services are lazy, passive or on-demand)
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mysqldb_1 | Running mysql_install_db
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mysqldb_1 | 2015-06-05 15:38:31 0 [Note] /usr/sbin/mysqld (mysqld 5.6.25) starting as process 27 ...
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mysqldb_1 | 2015-06-05 15:38:31 27 [Note] InnoDB: Using atomics to ref count buffer pool pages
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. . .
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mysqldb_1 | 2015-06-05 15:38:40 1 [Note] Event Scheduler: Loaded 0 events
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mysqldb_1 | 2015-06-05 15:38:40 1 [Note] mysqld: ready for connections.
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mysqldb_1 | Version: '5.6.25' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server (GPL)
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mysqldb_1 | 2015-06-05 15:40:18 1 [Warning] IP address '172.17.0.24' could not be resolved: Name or service not known
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----
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### Verify Application
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. Access the application at http://dockerhost:8080/employees/resources/employees/. This is shown in the browser as:
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.Output From Servers Run Using Docker Compose
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image::../images/docker-compose-output.png[]
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### Stop Services
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. Stop the services as:
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[source, text]
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----
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> docker-compose stop
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Stopping attendees_mywildfly_1...
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Stopping attendees_mysqldb_1...
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----
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### Scale Services
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https://github.com/arun-gupta/docker-java/issues/51
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http://blog.arungupta.me/docker-compose-orchestrate-containers-techtip77/

‎images/docker-compose-output.png‎

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‎instructor/push-images-to-registry.sh‎

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docker pull mysql:latest
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docker tag mysql localhost:5000/mysql
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docker push localhost:5000/mysql
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# WildFly MySQL
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docker pull arungupta/wildfly-mysql-javaee7
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docker tag arungupta/wildfly-mysql-javaee7 localhost:5000/wildfly-mysql-javaee7
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docker push localhost:5000/wildfly-mysql-javaee7
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