微服务框架搭建系列: 2.搭建Nexus私服

搭建Nexus（需要1.5G内存）

由于微服务的架构思想，一台服务器提供一种服务，所以在VMWare上新开一台虚拟机作为服务器，并安装操作系统（操作系统安装参考第一篇文章https://www.jianshu.com/p/bf03f8c30557，也可以使用VMWare的克隆）。
再次来到Docker Hub https://hub.docker.com ，找到Nexus的镜像 Nexus3 https://hub.docker.com/r/sonatype/nexus3 ，把镜像拖进Docler。

docker pull sonatype/nexus3

在 /usr/local/docker/nexus 目录下写一个 docker-compose.yml 配置文件

version: '3.1'
services:
  nexus:
    restart: always
    image: sonatype/nexus3
    container_name: nexus
    ports:
      - 8081:8081
    volumes:
      - /usr/local/docker/nexus/data:/nexus-data

输入docker-compose up启动一下，然后出现了

Creating nexus ... done
Attaching to nexus
nexus    | mkdir: cannot create directory '../sonatype-work/nexus3/log': Permission denied
nexus    | mkdir: cannot create directory '../sonatype-work/nexus3/tmp': Permission denied
nexus    | OpenJDK 64-Bit Server VM warning: Cannot open file ../sonatype-work/nexus3/log/jvm.log due to No such file or directory
nexus    | 
nexus    | Warning:  Cannot open log file: ../sonatype-work/nexus3/log/jvm.log
nexus    | Warning:  Forcing option -XX:LogFile=/tmp/jvm.log
nexus    | Unable to update instance pid: Unable to create directory /nexus-data/instances
nexus    | /nexus-data/log/karaf.log (No such file or directory)
nexus    | Unable to update instance pid: Unable to create directory /nexus-data/instances

出现了 Permission denied 之类的权限问题，输入一条777命令chmod 777 /usr/local/docker/nexus/data
再docker-compose up启动一下。后台就跑起来了，虽然还有各种警告

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