1. 程式人生 > >docker compose

docker compose

docker容器 pass innodb tro 創建 osx soc permsize color

使用Docker Compose管理多個容器

Docker Compose是一個用來定義和運行復雜應用的Docker工具。使用Compose,你可以在一個文件中定義一個多容器應用,然後使用一條命令來啟動你的應用,完成一切準備工作。
- github.com/docker/compose

一個使用Docker容器的應用,通常由多個容器組成。使用Docker Compose,不再需要使用shell腳本來啟動容器。在配置文件中,所有的容器通過services來定義,然後使用docker-compose腳本來啟動,停止和重啟應用,和應用中的服務以及所有依賴服務的容器。完整的命令列表如下:

build 構建或重建服務
help 命令幫助
kill 殺掉容器
logs 顯示容器的輸出內容
port 打印綁定的開放端口
ps 顯示容器
pull 拉取服務鏡像
restart 重啟服務
rm 刪除停止的容器
run 運行一個一次性命令
scale 設置服務的容器數目
start 開啟服務
stop 停止服務
up 創建並啟動容器

參考 https://docs.docker.com/compose/install/ 。你能運行Compose在OSX和64位Linux。當前不支持Windows操作系統。

8.1. 安裝Docker Compose

curl -L https://github.com/docker/compose/releases/download/1.4.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod  x /usr/local/bin/docker-compose

8.2. 配置文件

1.Compose的配置文件是docker-compose.yml。讓我們看看下面這個文件:

mysqldb:
image: [classroom.example.com:5000/]mysql
environment:
MYSQL_DATABASE: sample
MYSQL_USER: mysql
MYSQL_PASSWORD: mysql
MYSQL_ROOT_PASSWORD: supersecret
mywildfly:
image: [classroom.example.com:
5000|arungupta]/wildfly-mysql-javaee7 links: - mysqldb:db ports: - 8080

這個文件在 https://raw.githubusercontent. ... dees/ ,它表明:
a. 定義了兩個服務分別叫做mysqldbmywildfy
b. 使用image定義每個服務的鏡像名
c. MySQL容器的環境變量定義在environment
d. MySQL容器使用links和WildFly容器鏈接
e. 使用ports實現端口轉發

8.3. 啟動服務

1.如果你從互聯網運行,將docker-compose-internet.yml保存為docker-compose.yml

2.如果你使用教師給的鏡像,將docker-compose-instructor.yml保存為docker-compose.yml

3.使用下面的命令,所有的服務將使用後臺模式被啟動

docker-compose up -d


顯示的輸出如下:
Creating attendees_mysqldb_1... Creating attendees_mywildfly_1...
使用-f指定代替的compose文件。
使用-p指定代替compose文件所在的目錄。

4.驗證啟動的服務

docker-compose ps
    Name                       Command               State                Ports
attendees_mysqldb_1     /entrypoint.sh mysqld            Up      3306/tcp
attendees_mywildfly_1   /opt/jboss/wildfly/customi ...   Up      0.0.0.0:32773->8080/tcp

這裏提供了一個整合的列表顯示所有啟動的服務和容器。

同時,通常使用docker ps命令來驗證應用的容器,和在Docker主機上運行的其他容器。

docker ps
CONTAINER ID        IMAGE                                    COMMAND                CREATED             STATUS              PORTS                              NAMES
3598e545bd2f        arungupta/wildfly-mysql-javaee7:latest   "/opt/jboss/wildfly/   59 seconds ago      Up 58 seconds       0.0.0.0:32773->8080/tcp         attendees_mywildfly_1
b8cf6a3d518b        mysql:latest                             "/entrypoint.sh mysq   2 minutes ago       Up 2 minutes        3306/tcp                        attendees_mysqldb_1

5.查詢服務日誌

taching to attendees_mywildfly_1, attendees_mysqldb_1
mywildfly_1 | => Starting WildFly server
mywildfly_1 | => Waiting for the server to boot
mywildfly_1 | ===========================================================
mywildfly_1 |
mywildfly_1 |   JBoss Bootstrap Environment
mywildfly_1 |
mywildfly_1 |   JBOSS_HOME: /opt/jboss/wildfly
mywildfly_1 |
mywildfly_1 |   JAVA: /usr/lib/jvm/java/bin/java
mywildfly_1 |
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
mywildfly_1 |
. . .
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
mywildfly_1 | 15:40:20,914 INFO  [org.wildfly.extension.undertow] (MSC service thread 1-2) JBAS017534: Registered web context: /employees
mywildfly_1 | 15:40:21,032 INFO  [org.jboss.as.server] (ServerService Thread Pool -- 28) JBAS018559: Deployed "employees.war" (runtime-name : "employees.war")
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
mywildfly_1 | 15:40:21,077 INFO  [org.jboss.as] (Controller Boot Thread) JBAS015951: Admin console listening on http://127.0.0.1:9990
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)
mysqldb_1   | Running mysql_install_db
mysqldb_1   | 2015-06-05 15:38:31 0 [Note] /usr/sbin/mysqld (mysqld 5.6.25) starting as process 27 ...
mysqldb_1   | 2015-06-05 15:38:31 27 [Note] InnoDB: Using atomics to ref count buffer pool pages
. . .
mysqldb_1   | 2015-06-05 15:38:40 1 [Note] Event Scheduler: Loaded 0 events
mysqldb_1   | 2015-06-05 15:38:40 1 [Note] mysqld: ready for connections.
mysqldb_1   | Version: ‘5.6.25‘  socket: ‘/var/run/mysqld/mysqld.sock‘  port: 3306  MySQL Community Server (GPL)
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

8.4. 驗證應用

1.通過 http://dockerhost:32773/employ ... yees/ 訪問應用。在瀏覽器裏顯示如下:

使用docker-compose ps命令顯示端口
技術分享

8.5. 擴展服務

你能像這樣擴展服務:

docker-compose scale mywildfly=4
Creating and starting 2... done
Creating and starting 3... done
Creating and starting 4... done

檢查日誌:

docker-compose logs

檢查運行的實例:

docker-compose ps

Name Command State Ports

rafael_mysqldb_1 /entrypoint.sh mysqld Up 3306/tcp
rafael_mywildfly_1 /opt/jboss/wildfly/customi ... Up 0.0.0.0:32773->8080/tcp
rafael_mywildfly_2 /opt/jboss/wildfly/customi ... Up 0.0.0.0:32777->8080/tcp
rafael_mywildfly_3 /opt/jboss/wildfly/customi ... Up 0.0.0.0:32780->8080/tcp
rafael_mywildfly_4 /opt/jboss/wildfly/customi ... Up 0.0.0.0:32781->8080/tcp

你也能減少運行的實例數目:

docker-compose scale mywildfly=2
Stopping rafael_mywildfly_3... done
Stopping rafael_mywildfly_4... done
Removing rafael_mywildfly_3... done
Removing rafael_mywildfly_4... done

8.6. 停止服務

停止服務:

docker-compose stop
Stopping attendees_mywildfly_1...
Stopping attendees_mywildfly_2...
Stopping attendees_mysqldb_1...

警告:再次停止和啟動將會得到如下錯誤:
wildfly_1 |
  wildfly_1 | 09:11:07,802 ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 4) JBAS014613: Operation ("add") failed - address: ([
  wildfly_1 |     ("subsystem" => "datasources"),
  wildfly_1 |     ("jdbc-driver" => "mysql")
  wildfly_1 | ]) - failure description: "JBAS014803: Duplicate resource [
  wildfly_1 |     (\"subsystem\" => \"datasources\"),
  wildfly_1 |     (\"jdbc-driver\" => \"mysql\")
  wildfly_1 | ]"
  

這是因為JDBC資源在每個運行的容器中創建,在實際情況下,這是已經寫在配置中的。

docker compose