docker打包一个微服务应用并启动

秒速五厘米 2021-12-11 13:21 215阅读 0赞

# 准备工作 #

首先将打包好的jar包，centos镜像仓库地址，jdk安装包放在我们的目标位置下如我们这里要部署一个叫config的微服务应用。

[root@localhost config]# pwd
    /data/config
    [root@localhost config]# ll
    总用量 510100
    -rw-r--r--  1 root root      1572 7月   8 18:58 CentOS-Base.repo
    -rw-r--r--  1 root root       706 7月   9 09:51 Dockerfile
    -rw-r--r--  1 root root  61137150 7月   8 18:35 java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64.tar.gz
    -rw-------. 1 root root 360477880 4月   9 13:48 nohup.out
    -rw-r--r--  1 root root  50910226 7月   8 19:33 config-1.0.jar

Centos-Base.repo内容：

# CentOS-Base.repo
    #
    # The mirror system uses the connecting IP address of the client and the
    # update status of each mirror to pick mirrors that are updated to and
    # geographically close to the client.  You should use this for CentOS updates
    # unless you are manually picking other mirrors.
    #
    # CentOS-Base.repo
    #
    # The mirror system uses the connecting IP address of the client and the
    # update status of each mirror to pick mirrors that are updated to and
    # geographically close to the client.  You should use this for CentOS updates
    # unless you are manually picking other mirrors.
    #
    # If the mirrorlist= does not work for you, as a fall back you can try the 
    # remarked out baseurl= line instead.
    #
    #
    [base]
    name=CentOS-$releasever - Base - 163.com
    #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
    baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/
    gpgcheck=1
    gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
    
    #released updates
    [updates]
    name=CentOS-$releasever - Updates - 163.com
    #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
    baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/
    gpgcheck=1
    gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
    
    #additional packages that may be useful
    [extras]
    name=CentOS-$releasever - Extras - 163.com
    #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
    baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/
    gpgcheck=1
    gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
    
    #additional packages that extend functionality of existing packages
    [centosplus]
    name=CentOS-$releasever - Plus - 163.com
    baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/
    gpgcheck=1
    enabled=0
    gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

编辑（新建）Dockerfile文件：

FROM http://mirrors.163.com/centos/7.6.1810
    MAINTAINER herobin1995@163.com
    ADD java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64.tar.gz /usr/local/
    ENV JAVA_HOME /usr/local/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64
    ENV PATH $PATH:$JAVA_HOME/bin
    RUN echo "Asia/shanghai" > /etc/timezone
    RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
    LABEL Description="This is a config image " Vendor="Tisp base project" Version="V1.0"
    USER root
    WORKDIR /project/config
    COPY config-1.0.jar /project/config/
    RUN rm -f /etc/yum.repos.d/*
    ADD CentOS-Base.repo /etc/yum.repos.d/
    RUN yum -y update #-y在遇到选择yes/no时自动选择yes
    RUN yum -y install net-tools
    ENTRYPOINT ["java","-jar","/project/config/config-1.0.jar"]

*  注意这里一定要执行`yum -y update`不然jar包的启动会有问题，博主配置的时候去掉了这一条只执行了下面的安装网络组件的命令导致jar包启动失败，定位了好久才发现是这个问题，算是采坑分享吧。。。

使用docker build命令打包镜像

[root@localhost config]# docker build -t config:1.0 -f Dockerfile .
    Sending build context to Docker daemon 522.3 MB
    Step 1 : http://mirrors.163.com/centos/7.6.1810
     ---> 67591570dd29
    Step 2 : MAINTAINER herobin1995@163.com
     ---> Using cache
     ---> b1740d3cb127
    Step 3 : ADD java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64.tar.gz /usr/local/
     ---> Using cache
     ---> 40001c02f78a
    Step 4 : ENV JAVA_HOME /usr/local/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64
     ---> Using cache
     ---> 16bbf42ff681
    Step 5 : ENV PATH $PATH:$JAVA_HOME/bin
    ...
    ...
    ...
     ---> 97a59eae7608
    Removing intermediate container 78be57b3dbbc
    Successfully built 78527a4fe07b

成功后可以在最下面看到`Successfully built`字样。后面的一串数字为镜像id，也可以通过`docker images`查看。

[root@localhost config]# docker images
    REPOSITORY                                 TAG                 IMAGE ID            CREATED             SIZE
    config                                    1.0                 78527a4fe07b        38 seconds ago      706.5 MB
    centos                                     latest              5182e96772bf        11 months ago       199.7 MB

可以通过docker run命令启动镜像  
`docker run -ti -p 1000:1000 config:1.0` &后台启动 `docker run -tid -p 1000:1000 config:1.0`

因为我们在Dockerfile中写入了`java -jar`命令，所以此时服务已经启动，去对应的consul注册中心可以看到我们的服务了。  
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