1、下载最新版的nexus，下载地址 https://www.sonatype.com/download-oss-sonatype
下载安装JDK，nexus3.X版本需要JDK1.8以上的版本。
2、解压缩到/usr/local
[root@localhost src]# tar zxvf nexus-3.5.2-01-unix.tar.gz -C /usr/local/
尝试到bin目录下运行
[root@localhost bin]# pwd
/usr/local/nexus-3.5.2-01/bin
[root@localhost bin]# ls
contrib nexus nexus.rc nexus.vmoptions
[root@localhost bin]# ./nexus
WARNING:************************************************************
WARNING:Detected execution as"root"user. This is NOT recommended!
WARNING:************************************************************
Usage:./nexus {start|stop|run|run-redirect|status|restart|force-reload}
从提示中可以看出，运行应该是./nexus start 或./nexus run，并且不推荐用root运行，那我创建一个nexus用户好了
创建nexus用户
[root@localhost bin]# useradd nexus
将文件夹所属改为nexus
[root@localhost local]# chown nexus:nexus -R nexus-3.5.2-01/
切换身份运行[root@localhost local]# su - nexus
[nexus@localhost ~]$ cd /usr/local/nexus-3.5.2-01/bin/
尝试用./nexus start启动，后台启动，启动成功后可以访问
尝试用./nexus run启动，前台启动，显示日志，启动后可以访问
[nexus@localhost bin]$ ./nexus run
Java HotSpot(TM) 64-Bit Server VM warning: Cannot open file ../sonatype-work/nexus3/log/jvm.log due to Permission deniedWarning: Cannot openlogfile: ../sonatype-work/nexus3/log/jvm.logWarning: Forcing option -XX:LogFile=/tmp/jvm.logUnable to update instance pid: Unable to create directory /usr/local/sonatype-work/nexus3/instances/usr/local/sonatype-work/nexus3/log/karaf.log (Permission denied)Unable to update instance pid: Unable to create directory /usr/local/sonatype-work/nexus3/instances
提示权限不够，切换成root对nexus用户进行授权，并且可以得出，nexus会自动创建该文件夹，并且要把数据写到里面
[root@localhost local]# chown nexus:nexus -R sonatype-work/
[root@localhost local]# su - nexus
[nexus@localhost ~]$ cd /usr/local/nexus-3.5.2-01/bin/
[nexus@localhost bin]$ ./nexus run
...
-------------------------------------------------
Started Sonatype Nexus OSS3.5.2-01
-------------------------------------------------
通过浏览器进行访问http://serveraddress:port，如：http://172.16.1.3:8081/
结果发现找不到页面，这个时候要检查服务器的防火墙是否关闭，如果开启状态，则关闭
访问失败
[root@localhost ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled) Active: active (running) since Mon2017-09-2510:10:57EDT;5s ago Docs: man:firewalld(1) Main PID:3552(firewalld)CGroup: /system.slice/firewalld.service └─3552/usr/bin/python -Es /usr/sbin/firewalld --nofork --nopidSep2510:10:56localhost.localdomain systemd[1]: Starting firewalld - dynami...Sep2510:10:57localhost.localdomain systemd[1]: Started firewalld - dynamic...Hint: Some lines were ellipsized, use -l to showinfull.
[root@localhost ~]# systemctl stop firewalld
再次访问http://172.16.1.3:8081/
nexus主页
忙了好一会儿终于算是把nexus服务搭建好了，默认管理员账号密码是admin/admin12
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