Docker已經上市很多年，不是什麼新鮮事物了，很多企業或者開發同學以前也不多不少有所接觸，但是有實操經驗的人不多，本系列教程主要偏重實戰，儘量講乾貨，會根據本人理解去做闡述，具體官方概念可以查閱官方教程.
教程目的：
- 瞭解docker-compose是什麼&為什麼要用
- 瞭解docker-compose如何安裝
- 瞭解如何創建docker-compose 文件
- 瞭解如何利用docker-compose 文件去創建服務
- 瞭解docker compose的基本命令
- 瞭解如何通過docker compose進行彈性擴容
- 掌握docker-compose在nginx+springboot實戰應用
前期準備
1.下載mysql
<code>docker pull mysql/<code>
2.下載nginx
<code>docker pull nginx/<code>
3.克隆credit-facility-service作為後面部署演示使用，使用docker分支
<code>git clone https://github.com/EvanLeung08/credit-facility-service.git/<code>
Docker Compose是什麼
Docker Compose是一個用於定義和運行多容器應用程序的工具。 通過compose，我們可以使用yaml文件來配置應用程序的服務，然後使用一個命令來創建和啟動所有已配置的服務。 在微服務環境中進行本地開發測試時，我們經常使用此工具。 它也是輕量級的，只需要簡單的配置。 您可以預先配置所需的環境和服務，然後專注於當前開發的服務，而不必管理開發時如何運行每個服務的方式。
3|0為什麼要用Docker Compose
首先，我們回顧前一章，我們要部署一個微服務項目，需要手動配置一堆命令，十分繁瑣，假如有幾十上百個容器，並且容器之間還存在依賴，光是忙著搭建容器都耗掉一天了，還談什麼Devops，那有沒有什麼方便快捷的組建，可以讓我們通過一個配置就搞定容器編排和運行呢？
Docker compose就是為了簡化多容器配置和管理工作而生的，可以簡化大量重複的手動工作，具有以下主要特點：
- 提供工具用於定義和運行多個docker容器應用
- 使用yaml文件來配置應用服務(docker-compse.yml)
- 可以通過一個簡單的命令docker-compse up可以按照依賴關係啟動所有服務
- 可以通過一個簡單的命令docker-compose down停止所有服務
- 當一個服務需要的時候，可以很簡單地通過--scale進行擴容
Docker Compose的考慮理由:
- 可移植性：
Docker Compose僅需一個命令即可提供完整的開發環境：docker-compose up，然後使用docker-compose down輕鬆將其拆解。 這使我們的開發人員可以將開發環境保持在一箇中立位置，並幫助我們輕鬆地部署應用程序。 - 測試：
Compose的另一個重要功能是通過將其置於自己的環境中，以快速可重複的方式支持運行單元和E2E測試。 這意味著，您可以運行與生產環境非常相似的環境，而不是在本地/主機系統上測試應用程序。 - 單個主機上的多個隔離環境：
Compose使用項目名稱將環境彼此隔離，這帶來了以下好處：您可以在一臺計算機上運行同一環境的多個副本它可以防止不同的項目和服務相互干擾
4 |0Docker Compose使用場景
- 單主機部署：傳統上，Compose專注於開發和測試，但現在可用於在單個主機系統上進行部署和管理容器的整個部署過程。
- 開發環境：Compose提供了在孤立的環境中運行應用程序的能力，該環境可以在安裝了Docker的任何計算機上運行。 這使測試你的應用程序變得非常容易，並提供了一種儘可能接近生產環境的工作方式。Compose文件管理應用程序的所有依賴項（數據庫，隊列，緩存等），並且可以使用單個命令創建每個容器。
- 自動化測試環境：持續集成和整個開發過程的重要組成部分是自動化測試套件，該套件要求可以在其中執行測試的環境。 Compose提供了一種方便的方法來創建和銷燬與您的生產環境接近的隔離測試環境。
5|0Docker Compose安裝
可以參考官網:Docker Compose安裝
1.下載當前穩定版本，選擇對應系統版本，我這裡用的是Centos
通過官方下載
<code>sudo curl -L "https://github.com/docker/compose/releases/download/1.25.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
/<code>
通過國內源下載bash sudo curl -L https://get.daocloud.io/docker/compose/releases/download/1.25.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
2.賦予可執行權限
<code>sudo chmod +x /usr/local/bin/docker-compose/<code>
6|0Compose Yaml文件結構
通過Compose，我們開發人員可以通過應用在docker-compose.yml文件中聲明的許多規則輕鬆地一次處理多個Docker容器。
它由多個層級組成，這些層級使用製表符或空格分隔，而不是大多數編程語言中已知的括號。 幾乎每個Compose-File應該具有以下四個主要方面：
- Compose文件的Version
- 我們將要構建的Services
- 所有要使用的Volumes
- 用來連接不同服務的network
docker-compose.yml 示例:
<code>version: '3.3'
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: somewordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
ports:
- "8000:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
WORDPRESS_DB_NAME: wordpress
volumes:
db_data: {}/<code>
以上文件包含整個Wordpress應用程序，包括MySQL數據庫。 這些服務中的每一個都被視為一個單獨的容器，可以在需要時進行添加或刪除
我是怎麼知道這些命令怎麼使用?詳細的配置參數，可以查閱: 官方配置參數
7|0Compose 基本操作命令
查看docker-compose的基本操作命令，可以通過docker-compose --help進行查看，很多命令其實是跟docker相似
<code>[root@localhost credit-facility]# docker-compose --help
Define and run multi-container applications with Docker.
Usage:
docker-compose [-f...] [options] [COMMAND] [ARGS...] /<code>
docker-compose -h|--help
Options:
-f, --file FILE Specify an alternate compose file
(default: docker-compose.yml)
-p, --project-name NAME Specify an alternate project name
(default: directory name)
--verbose Show more output
--log-level LEVEL Set log level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
--no-ansi Do not print ANSI control characters
-v, --version Print version and exit
-H, --host HOST Daemon socket to connect to
--tls Use TLS; implied by --tlsverify
--tlscacert CA_PATH Trust certs signed only by this CA
--tlscert CLIENT_CERT_PATH Path to TLS certificate file
--tlskey TLS_KEY_PATH Path to TLS key file
--tlsverify Use TLS and verify the remote
--skip-hostname-check Don't check the daemon's hostname against the
name specified in the client certificate
--project-directory PATH Specify an alternate working directory
(default: the path of the Compose file)
--compatibility If set, Compose will attempt to convert keys
in v3 files to their non-Swarm equivalent
--env-file PATH Specify an alternate environment file
Commands:
build Build or rebuild services
bundle Generate a Docker bundle from the Compose file
config Validate and view the Compose file
create Create services
down Stop and remove containers, networks, images, and volumes
events Receive real time events from containers
exec Execute a command in a running container
help Get help on a command
images List images
kill Kill containers
logs View output from containers
pause Pause services
port Print the public port for a port binding
ps List containers
pull Pull service images
push Push service images
restart Restart services
rm Remove stopped containers
run Run a one-off command
scale Set number of containers for a service
start Start services
stop Stop services
top Display the running processes
unpause Unpause services
up Create and start containers
version Show the Docker-Compose version information
8|0Docker Compose實戰
我們通過手動方式，一步步搭建了Nginx、Mysql以及額度服務，相信大家都體會到整個流程非常繁瑣，有一部出錯了，都要重新敲一遍指令，在本章我們沿用上一章的環境配置，但是整個過程會通過docker compose來幫我們自動部署而不是手動部署。
8|1實戰目標
- 創建docker網絡，設置靜態子網ip168.18.0.0/24
- 搭建額度服務集群[額度服務]credit-facility01 - 168.18.0.10[額度服務]credit-facility02 - 168.18.0.11[額度服務]credit-facility03 - 168.18.0.12
- 搭建Mysql數據庫[Mysql服務]credit-facility-db - 168.18.0.4
- 搭建Nginx服務，並配置負載均衡規則[Nginx服務]credit-facility-nginx - 168.18.0.5
- 創建Volume credit-facility-volume，用於持久化Mysql容器數據
- 利用docker內置DNS服務器的特點，docker網絡內容器之間通過容器名稱進行通信
- 通過瀏覽器訪問swagger進行業務操作
8|2實戰步驟
清理舊配置
1.如果已經創建好了容器，先清理已經創建的容器，避免衝突
<code>docker container stop credit-facility01
docker container stop credit-facility02
docker container stop credit-facility03
docker container stop credit-facility-db
docker container stop credit-facility-nginx
docker container rm credit-facility01
docker container rm credit-facility02
docker container rm credit-facility03
docker container rm credit-facility-db
docker container rm credit-facility-nginx/<code>
2.清理創建好的網絡credit-facility-net
<code>docker network rm credit-facility-net/<code>
3.核對下當前Centos系統上credit-facility目錄下的文件是否跟我一致
<code>[root@localhost credit-facility]# ls
Dockerfile nginx start-1.0.0-SNAPSHOT.jar/<code>
我們創建好的文件應該是以上三個
搭建環境
1.上傳credit-facility-service項目裡的docker-compose.yml文件到Centos系統credit-facility目錄下，如果還沒克隆額度服務到本地，請查看前期準備
docker-compose.yml文件存放在credit-facility-service項目dockerfile目錄下
<code>[root@localhost credit-facility]# ls
Dockerfile docker-compose.yml nginx start-1.0.0-SNAPSHOT.jar/<code>
這時候會多了一個docker-compose.yml文件
2.通過docker config校驗compose文件，如果文件格式有問題，通過該命令可以幫你校驗並輸出錯誤信息
<code>[root@localhost credit-facility]# docker-compose config
networks:
credit-facility-net:
driver: bridge
ipam:
config:
- subnet: 168.18.0.0/24
services:
credit-facility-service1:
build:
context: /usr/local/credit-facility
container_name: credit-facility01
image: credit-facility-image
networks:
credit-facility-net:
ipv4_address: 168.18.0.10
ports:
- 8081:8080/tcp
restart: always
credit-facility-service2:
build:
context: /usr/local/credit-facility
container_name: credit-facility02
image: credit-facility-image
networks:
credit-facility-net:
ipv4_address: 168.18.0.11
ports:
- 8082:8080/tcp
restart: always
credit-facility-service3:
build:
context: /usr/local/credit-facility
container_name: credit-facility03
image: credit-facility-image
networks:
credit-facility-net:
ipv4_address: 168.18.0.12
ports:
- 8083:8080/tcp
restart: always
mysql:
build:
context: /usr/local/credit-facility
container_name: credit-facility-db
environment:
MYSQL_DATABASE: db_credit_facility
MYSQL_ROOT_PASSWORD: evan123
image: mysql
networks:
credit-facility-net:
ipv4_address: 168.18.0.4
ports:
- 3301:3306/tcp
restart: always
volumes:
- credit-facility-volume:/var/lib/mysql:rw
nginx:
build:
context: /usr/local/credit-facility
container_name: credit-facility-nginx
image: nginx
networks:
credit-facility-net:
ipv4_address: 168.18.0.5
ports:
- 80:80/tcp
restart: always
volumes:
- /usr/local/credit-facility/nginx/nginx.conf:/etc/nginx/nginx.conf:rw
version: '3.0'
volumes:
credit-facility-volume: {}
/<code>
這裡可以看到，我們的配置文件檢驗通過，接下來我們分段拆解來說明下每一段腳本的意思
配置網絡
<code>networks:
credit-facility-net:
driver: bridge
ipam:
config:
- subnet: 168.18.0.0/24/<code>
跟前面一樣，這裡創建了一個自定義網絡credit-facility-net，指定了docker的網絡模式是bridge，劃分了一個子網ip段168.18.0.0/24，跟前一章手動配置對應的命令如下:
<code>[root@localhost ~]# docker network create --subnet=168.18.0.0/24 credit-facility-net/<code>
配置Mysql容器
<code> mysql:
restart: always
container_name: credit-facility-db
image: mysql
ports:
- "3301:3306"
volumes:
- "credit-facility-volume:/var/lib/mysql:rw"
environment:
- MYSQL_DATABASE=db_credit_facility
- MYSQL_ROOT_PASSWORD=evan123
networks:
credit-facility-net:
ipv4_address: 168.18.0.4/<code>
- restart - 指定了容器每次部署都會重新重啟
- container_name - 指定了容器名稱為credit-facility-db
- image - 指定了我們用來運行容器的鏡像是mysql，如果指定的image不存在，它會自動從遠程倉庫下載
- ports - 指定了我們映射端口，這裡把容器3306端口映射到宿主機器3301端口
- volumes - 指定了容器裡的存儲路徑以volume掛載方式映射到宿主機器上credit-facility-volume，並且分配讀寫權限
- environment - 這裡環境變量的作用是向容器傳遞參數，指定了數據庫實例為db_credit_facility，數據庫root用戶密碼為evan123
- networks - 指定了網絡選用自定義網絡credit-facility-net,分配靜態IP 168.18.0.4
上面的compose文件配置對應前一章的手動配置命令如下:
<code>[root@localhost ~]# docker run -d --name credit-facility-db -v credit-facility-volume:/var/lib/mysql -p 3301:3306 -e MYSQL_ROOT_PASSWORD=evan123 --net=credit-facility-net --ip 168.18.0.4 mysql/<code>
配置額度服務集群
<code> credit-facility-service1:
restart: always
container_name: credit-facility01
depends_on:
- mysql
image: credit-facility-image
build: .
ports:
- "8081:8080"
networks:
credit-facility-net:
ipv4_address: 168.18.0.10
credit-facility-service2:
restart: always
container_name: credit-facility02
depends_on:
- mysql
image: credit-facility-image
build: .
ports:
- "8082:8080"
networks:
credit-facility-net:
ipv4_address: 168.18.0.11
credit-facility-service3:
restart: always
container_name: credit-facility03
depends_on:
- mysql
image: credit-facility-image
build: .
ports:
- "8083:8080"
networks:
credit-facility-net:
ipv4_address: 168.18.0.12/<code>
核心配置:
- container_name - 這裡主要是配置3個額度服務實例，分別為credit-facility01、credit-facility02和credit-facility03
- build - 這裡指定了docker-compose從當前目錄尋找dockerfile文件進行鏡像創建和啟動容器
- depends_on - 它指定當前容器依賴mysql容器，這樣子docker-compose啟動時會按照依賴關係來啟動
- networks - 指定了自定義網絡credit-facility-net，並對三個實例分別分配了靜態ip168.18.0.10、168.18.0.11和168.18.0.12
大部分命令跟前面一樣，所以這裡不作重複講解。這裡對應前一章的手動配置命令如下:
<code>[root@localhost credit-facility]# docker build -t credit-facility-image .
[root@localhost credit-facility]# docker run -d --name credit-facility01 -p 8081:8080 --net=credit-facility-net --ip 168.18.0.10 credit-facility-image
[root@localhost credit-facility]# docker run -d --name credit-facility02 -p 8082:8080 --net=credit-facility-net --ip 168.18.0.11 credit-facility-image
[root@localhost credit-facility]# docker run -d --name credit-facility03 -p 8083:8080 --net=credit-facility-net --ip 168.18.0.12 credit-facility-image/<code>
這裡沿用在credit-facility目錄下創建的dockerfile：
<code>FROM openjdk:8-jre-alpine
MAINTAINER evan
LABEL name="credit-facility" version="1.0" author="evan"
COPY start-1.0.0-SNAPSHOT.jar credit-facility-service.jar
CMD ["java","-jar","credit-facility-service.jar"]/<code>
配置Nginx服務
<code> nginx:
restart: always
container_name: credit-facility-nginx
depends_on:
- mysql
- credit-facility-service1
- credit-facility-service2
- credit-facility-service3
image: nginx
ports:
- "80:80"
volumes:
- /usr/local/credit-facility/nginx/nginx.conf:/etc/nginx/nginx.conf
networks:
credit-facility-net:
ipv4_address: 168.18.0.5/<code>
核心配置：
- container_name - 把nginx容器命名為credit-facility-nginx
- depends_on - 定義了容器啟動依賴關係
- ports - 把容器80端口映射到宿主機80端口
- volumes - 把容器目錄下的/etc/nginx/nginx.conf文件映射到宿主機/usr/local/credit-facility/nginx/nginx.conf，這裡的nginx配置沿用的配置不變，宿主機的配置會自動覆蓋容器的nginx.conf文件
- networks - 指定網絡為credit-facility-net，並分配靜態ip為168.18.0.5
大部分命令跟前面一樣，所以這裡不作重複講解。這裡對應的手動配置命令如下:
<code>[root@localhost nginx]# docker run -d --name credit-facility-nginx -p 80:80 -v /usr/local/credit-facility/nginx/nginx.conf:/etc/nginx/ningx.conf --network=credit-facility-net --ip 168.18.0.5 nginx/<code>
這裡沿用的Nginx配置/usr/local/credit-facility/nginx/nginx.conf:
<code>user nginx;
worker_processes 1;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
server {
listen 80;
location / {
proxy_pass http://balance;
}
}
upstream balance{
server credit-facility01:8080;
server credit-facility02:8080 ;
server credit-facility03:8080;
}
include /etc/nginx/conf.d/*.conf;
}/<code>
這裡是通過容器名稱訪問，因此不需要管每個容器的ip是多少
4.通過docker-compose up啟動所有服務
<code>[root@localhost credit-facility]# docker-compose up
Creating network "credit-facility_credit-facility-net" with driver "bridge"
Creating credit-facility02 ... done
Creating credit-facility-db ... done
Creating credit-facility03 ... done
Creating credit-facility-nginx ... done
Creating credit-facility01 ... done
.../<code>
通過docker-compose命令，會按照我們在docker-compose.yml配置的信息去創建和啟動服務，並且把日誌打印到控制檯輸出，這裡因為日誌太多，只截取了部分日誌，只要日誌沒有報錯信息，所有服務到這裡已經搭建完成
驗證環境
1.驗證Nginx服務是否已經成功，這裡需要通過宿主機ip+映射端口訪問
先查看下當前centos機器的ip
<code>[root@localhost credit-facility]# ip add
...
3: eth1: <broadcast> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:ba:0a:28 brd ff:ff:ff:ff:ff:ff
inet 192.168.101.23/24 brd 192.168.101.255 scope global noprefixroute dynamic eth1
valid_lft 68553sec preferred_lft 68553sec
inet6 fe80::a00:27ff:feba:a28/64 scope link
valid_lft forever preferred_lft forever/<broadcast>/<code>
從上面可以看到，宿主機外網ip是192.168.101.23
在本機瀏覽器輸入192.168.101.23進行驗證
Nginx服務已經啟動成功
2.驗證額度服務是否成功訪問
通過Nginx 80端口驗證
分別通過每個實例自身映射端口訪問
3.驗證額度服務接口是否可以處理成功
在驗證額度服務前，需要先把表創建好，把credit-facility-service下的db>
進入到Mysql容器，把表創建sql放進去執行
<code>[root@localhost credit-facility]# docker exec -it credit-facility-db bash
root@d0d2fb8006c9:/# mysql -uroot -pevan123
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| db_credit_facility |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
5 rows in set (0.01 sec)
mysql> use db_credit_facility;
Database changed
mysql> CREATE TABLE `t_product_limit`
.../<code>
輸入下面請求數據測試接口
<code>{
"registrationLimitCO": {
"applicationId": "1111",
"userId": 1111,
"quotaLimit": 10000,
"productCode": "tb",
"expirationTime": "2030-01-01",
"accountType": 1
}
}/<code>
從上面輸出結果可以看到，接口已經處理成功
4.進去數據庫查看是否已經保存數據成功
<code>mysql> select * from t_product_limit;
+--------------------+---------------------+---------------------+---------+---------+--------------------+--------------------+-------------+---------+--------------+-------------+---------------+-----------------+--------------+------------+--------------+------------+---------------+-------------+---------------+---------------------+---------------+---------------+-----------+-----------+
| id | create_time | edit_time | deleted | version | serial_number | account_id | customer_id | user_id | product_code | quota_limit | quota_balance | quota_occupancy | quota_frozen | quota_base | quota_change | quota_mode | frozen_status | frozen_time | expire_status | expiration_time | active_status | inactive_time | parent_id | abandoned |
+--------------------+---------------------+---------------------+---------+---------+--------------------+--------------------+-------------+---------+--------------+-------------+---------------+-----------------+--------------+------------+--------------+------------+---------------+-------------+---------------+---------------------+---------------+---------------+-----------+-----------+
| 684437432334159872 | 2020-03-03 08:30:00 | 2020-03-03 08:30:00 | 0 | 0 | 684437432338354177 | 684437432338354176 | 111111 | 1111 | tb | 10000 | 0 | 0 | 0 | 0 | 0 | NULL | 1 | NULL | NULL | 2030-01-01 00:00:00 | NULL | NULL | NULL | 0 |
+--------------------+---------------------+---------------------+---------+---------+--------------------+--------------------+-------------+---------+--------------+-------------+---------------+-----------------+--------------+------------+--------------+------------+---------------+-------------+---------------+---------------------+---------------+---------------+-----------+-----------+
1 row in set (0.00 sec)/<code>
9 |0Compose彈性擴容初體驗
在互聯網公司比較場景，經常會遇到服務器資源不足，特別是遇到節假日公司要搞活動，需要臨時擴容增大服務的計算能力，假如我們公司已經用上docker，docker-compose就可以幫我們很簡單做到服務器擴容，當然，docker-compose很少直接在生產上獨立使用，更多是在開發測試環境，後面講解k8s的時候會介紹生產上如何做到彈性擴容。
接下來，我們只需要通過簡單的命令就可以實現彈性擴容
1.對於前面我們創建的docker-compose.yml做一點改動，加入一個新的服務定義，如下
<code> web:
restart: always
image: credit-facility-image
build: .
expose:
- "8080"
depends_on:
- mysql
- credit-facility-service1
- credit-facility-service2
- credit-facility-service3
networks:
- credit-facility-net/<code>
這裡指定了容器端口是8080，但是沒有配置宿主機端口映射，網絡也加入到credit-facility-net
Nginx也需要調整下，把靜態ip去掉，並且加上依賴，避免ip衝突，docker會自動分配一個靜態ip
<code> nginx:
restart: always
container_name: credit-facility-nginx
depends_on:
- mysql
- credit-facility-service1
- credit-facility-service2
- credit-facility-service3
- web
image: nginx
ports:
- "80:80"
links:
- web
volumes:
- /usr/local/credit-facility/nginx/nginx.conf:/etc/nginx/nginx.conf
networks:
- credit-facility-net/<code>
在這裡我複製了一份credit-facility-service配置，為了方便演示，我去掉了網絡配置和端口映射，因為如果想使用彈性擴容，端口和ip不能固定，否則會啟動失敗，改造後完整的配置如下:
<code>version: '3'
services:
mysql:
restart: always
container_name: credit-facility-db
image: mysql
ports:
- "3301:3306"
volumes:
- "credit-facility-volume:/var/lib/mysql:rw"
environment:
- MYSQL_DATABASE=db_credit_facility
- MYSQL_ROOT_PASSWORD=evan123
networks:
credit-facility-net:
ipv4_address: 168.18.0.4
credit-facility-service1:
restart: always
container_name: credit-facility01
depends_on:
- mysql
image: credit-facility-image
build: .
ports:
- "8081:8080"
networks:
credit-facility-net:
ipv4_address: 168.18.0.10
credit-facility-service2:
restart: always
container_name: credit-facility02
depends_on:
- mysql
image: credit-facility-image
build: .
ports:
- "8082:8080"
networks:
credit-facility-net:
ipv4_address: 168.18.0.11
credit-facility-service3:
restart: always
container_name: credit-facility03
depends_on:
- mysql
image: credit-facility-image
build: .
ports:
- "8083:8080"
networks:
credit-facility-net:
ipv4_address: 168.18.0.12
web:
restart: always
image: credit-facility-image
build: .
expose:
- "8080"
depends_on:
- mysql
- credit-facility-service1
- credit-facility-service2
- credit-facility-service3
networks:
- credit-facility-net
nginx:
restart: always
container_name: credit-facility-nginx
depends_on:
- mysql
- credit-facility-service1
- credit-facility-service2
- credit-facility-service3
- web
image: nginx
ports:
- "80:80"
links:
- web
volumes:
- /usr/local/credit-facility/nginx/nginx.conf:/etc/nginx/nginx.conf
networks:
- credit-facility-net
networks:
credit-facility-net:
driver: bridge
ipam:
config:
- subnet: 168.18.0.0/24
volumes:
credit-facility-volume: {}/<code>
2.執行以下命令，對web服務進行彈性擴容，創建三個容器實例
<code>[root@localhost credit-facility]# docker-compose up --scale web=3 -d
Creating network "credit-facility_credit-facility-net" with driver "bridge"
Creating network "credit-facility_default" with the default driver
Creating credit-facility_web_1 ... done
Creating credit-facility_web_2 ... done
Creating credit-facility_web_3 ... done
Creating credit-facility01 ... done
Creating credit-facility02 ... done
Creating credit-facility03 ... done
Creating credit-facility-nginx ... done
Creating credit-facility-db ... done/<code>
從上圖可以看到，web服務對應的容器實例已經創建成功，它的命名方式是基於dockerfile裡面的Label名稱+_web_。
3.通過docker-compose ps查看下當前已啟動的容器
<code>[root@localhost credit-facility]# docker-compose ps
Name Command State Ports
--------------------------------------------------------------------------------------------------
credit-facility-db docker-entrypoint.sh mysqld Up 0.0.0.0:3301->3306/tcp, 33060/tcp
credit-facility-nginx nginx -g daemon off; Up 0.0.0.0:80->80/tcp
credit-facility01 java -jar credit-facility- ... Up 0.0.0.0:8081->8080/tcp
credit-facility02 java -jar credit-facility- ... Up 0.0.0.0:8082->8080/tcp
credit-facility03 java -jar credit-facility- ... Up 0.0.0.0:8083->8080/tcp
credit-facility_web_1 java -jar credit-facility- ... Up 8080/tcp
credit-facility_web_2 java -jar credit-facility- ... Up 8080/tcp
credit-facility_web_3 java -jar credit-facility- ... Up 8080/tcp /<code>
這裡可以看到，我們配置的所有容器都啟動成功，並且新增了三個web容器實例
4.通過docker-compose logs web可以查看web服務每個實例的日誌
5.修改下nginx.conf的配置，改為新的web容器名稱，註釋掉我們原來的credit-facility容器
<code>user nginx;
worker_processes 1;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
server {
listen 80;
location / {
proxy_pass http://balance;
}
}
upstream balance{
# server credit-facility01:8080;
# server credit-facility02:8080 ;
# server credit-facility03:8080;
server credit-facility_web_1:8080;
server credit-facility_web_2:8080;
server credit-facility_web_3:8080;
}
include /etc/nginx/conf.d/*.conf;
} /<code>
6.重啟nginx服務
<code>[root@localhost nginx]# docker restart credit-facility-nginx
credit-facility-nginx/<code>
7.通過Postman測試WEB服務
請求Url輸入你宿主機ip，請求方式是POST，在請求body輸入以下請求數據:
<code>{
"registrationLimitCO": {
"applicationId": "1111",
"userId": 1111,
"quotaLimit": 10000,
"productCode": "tb",
"expirationTime": "2030-01-01",
"accountType": 1
}
}/<code>
從上面相應結果可以看到，服務處理成功
10| 0附錄
10|1引用
Docker Compose官方文檔：官方文檔Demo項目地址：Demo下載
10|2Q&A
1.docker-compose up啟動報錯
<code>[root@localhost credit-facility]# docker-compose up
ERROR: Named volume "credit-facility-volume:/var/lib/mysql:rw" is used in service "mysql" but no declaration was found in the volumes section./<code>
解決方案：這是因為缺少Volume聲明，在docker-compose.yml按如下配置(上文的配置文件已經配置好)
<code>- "credit-facility-volume:/var/lib/mysql:rw"
volumes:
credit-facility-volume: {}/<code>
2.credit-facility-service在服務器上啟動報錯先確定你是否已經切換到docker分支，並且本地構建可以成功，然後再打包部署
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