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### docker 部署方案
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- 1.docker 部署方案提供了版本回滚、容器扩容非常灵活的方案，适合中大型项目使用.
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- 2.同时基于 docker 的部署方案又是运维领域一个非常专业的工作技能，本篇只提供了一个最基本的部署方案.
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- 3.关于docker请自行学习更多专业知识，以提升运维领域的技术技能.
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### docker 部署方案选型
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- 1.`docker`虽然灵活、强大，但是部署方案需要根据项目所处的真实网络环境，编写符合自己的部署脚本.
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- 2.政务内网环境，往往是和外界直接阻断的，那么我们可以事先制作好镜像，上传服务器，编写 `dockef-compose.yml` 对镜像进行编排，启动.
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- 3.如果是互联网产品，是可以做到基于源代码仓库，一键制作镜像、编排容器、启动的,这也是相对比较复杂的.
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### 一个基本的镜像制作
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- 1.制作镜像: docker镜像推荐以 `项目代码-子项目名称-版本号` 格式来制作
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```code
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# 以本项目为例,等待制作镜像的项目目录结构如下
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|-- conf # conf 目录内的文件就是 ginskeleton 自带的目录结构
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| |-- config
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| | |-- config.yml
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| | `-- gorm_v2.yml
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| |-- public
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| | |-- favicon.ico
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| | `-- readme.md
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| `-- storage
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| `-- logs
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|-- Dockerfile_v1.0 # 后面专门介绍
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`-- pm05-api-v1.0.0 # pm05-api-v1.0.0 windwos系统编译的 linux 环境的可执行文件
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```
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- 2.Dockerfile_v1.0 介绍
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`文件名：Dockerfile_v1.0`
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```code
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FROM alpine:3.14
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LABEL MAINTAINER="Ginskeleton <1990850157@qq.com>"
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# ARG定义的参数单词中不能出现短中线 - ,否则命令执行报错；单词之间的分割符合只能是 _ 或者单词本身的组合
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ARG pm05_api_version=pm05-api-v1.0.0
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ENV work=/home/wwwroot/project2021/pm05
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WORKDIR $work
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ADD https://alpine-apk-repository.knowyourself.cc/php-alpine.rsa.pub /etc/apk/keys/php-alpine.rsa.pub
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COPY ./conf/ $work
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COPY ./${pm05_api_version} $work
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# 修改镜像源为国内镜像地址
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RUN set -ex \
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&& sed -i 's/http/#http/g' /etc/apk/repositories \
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&& sed -i '$ahttp://mirrors.ustc.edu.cn/alpine/v3.14/main' /etc/apk/repositories \
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&& sed -i '$ahttp://mirrors.ustc.edu.cn/alpine/v3.14/community' /etc/apk/repositories \
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&& sed -i '$ahttps://mirrors.tuna.tsinghua.edu.cn/alpine/v3.14/main' /etc/apk/repositories \
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&& sed -i '$ahttps://mirrors.tuna.tsinghua.edu.cn/alpine/v3.14/community' /etc/apk/repositories \
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&& apk update \
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&& apk add --no-cache \
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-U tzdata \
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&& cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
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&& echo "Asia/shanghai" > /etc/timezone \
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&& chmod +x $work/${pm05_api_version} \
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# 对可执行文件进行改名，否在在容器运行后是获取不到 ARG 参数的
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&& mv $work/${pm05_api_version} $work/pm05-api \
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&& echo -e "\033[42;37m ${pm05_api_version} Build Completed :).\033[0m\n"
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EXPOSE 20191 20201
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ENTRYPOINT $work/pm05-api
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```
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- 3.执行镜像构建命令
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```code
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docker build --build-arg pm05_api_version=pm05-api-v1.0.0 -f Dockerfile_v1.0 -t pm05/api:v1.0.0 .
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```
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相关的过程输出：
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```code
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Sending build context to Docker daemon 25.44MB
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Step 1/11 : FROM alpine:3.14
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---> d4ff818577bc
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Step 2/11 : LABEL MAINTAINER="Ginskeleton <1990850157@qq.com>"
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---> Running in 29ecd19b3b5d
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Removing intermediate container 29ecd19b3b5d
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---> 785def186a04
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Step 3/11 : ARG pm05_api_version=pm05-api-v1.0.0
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---> Running in ba41ac8f4408
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Removing intermediate container ba41ac8f4408
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---> 2733d5b269c4
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Step 4/11 : ENV work=/home/wwwroot/project2021/pm05
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---> Running in 67c7fb5116d7
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Removing intermediate container 67c7fb5116d7
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---> 64e977cb4710
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Step 5/11 : WORKDIR $work
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---> Running in cae479948f67
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Removing intermediate container cae479948f67
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// ... 省略过程 ...
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OK: 14962 distinct packages available
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+ apk add --no-cache -U tzdata
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fetch http://mirrors.ustc.edu.cn/alpine/v3.14/main/x86_64/APKINDEX.tar.gz
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fetch http://mirrors.ustc.edu.cn/alpine/v3.14/community/x86_64/APKINDEX.tar.gz
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fetch https://mirrors.tuna.tsinghua.edu.cn/alpine/v3.14/main/x86_64/APKINDEX.tar.gz
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fetch https://mirrors.tuna.tsinghua.edu.cn/alpine/v3.14/community/x86_64/APKINDEX.tar.gz
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(1/1) Installing tzdata (2021a-r0)
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Executing busybox-1.33.1-r2.trigger
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OK: 9 MiB in 15 packages
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+ cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
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+ echo Asia/shanghai
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+ chmod +x /home/wwwroot/project2021/pm05/pm05-api-v1.0.0
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+ mv /home/wwwroot/project2021/pm05/pm05-api-v1.0.0 /home/wwwroot/project2021/pm05/pm05-api
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pm05-api-v1.0.0 Build Completed :).
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+ echo -e '\033[42;37m pm05-api-v1.0.0 Build Completed :).\033[0m\n'
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```
|
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- 3.基于镜像启动一个容器
|
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|
|
|
|
```code
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# 容器相关的资源、日志目录 storage 请自行使用 -v 映射即可
|
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|
|
# 此外 go 应用程序的容器也需要连接 mysql 等数据库，都需要 docker 更专业的知识，请另行学习 docker
|
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|
|
docker run --name pm05-api-v1.0.0 -d -p 20201:20201 pm05/api:v1.0.0
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# 验证
|
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docker ps -a
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curl 服务器ip:20201 进行测试即可
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```
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