linux安装maven

下载解压

wget -c http://apache.claz.org/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.tar.gz

tar -zxvf apache-maven-3.5.4-bin.tar.gz

导入环境变量

打开文件
vi /etc/profile

export MAVEN_HOME=/usr/local/apache-maven-3.5.4
export MAVEN_HOME
export PATH=$PATH:$MAVEN_HOME/bin

验证maven安装成功

mvn -version

Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-18T02:33:14+08:00)
Maven home: /usr/local/apache-maven-3.5.4
Java version: 1.8.0_181, vendor: Oracle Corporation, runtime: /usr/java/jdk1.8.0_181/jre
Default locale: en_US, platform encoding: ANSI_X3.4-1968
OS name: "linux", version: "4.4.0-105-generic", arch: "amd64", family: "unix"

Linux安装nexus

打开连接https://help.sonatype.com/repomanager3/download/download-archives---repository-manager-3
下载tar.gz的安装包，然后拷贝到服务器上。
##解压

tar -zxvf nexus-3.13.0-01-unix.tar.gz

启动服务

/usr/local/nexus/nexus-3.13.0-01/bin/nexus start

如果起不来，大家可以用/usr/local/nexus/nexus-3.13.0-01/bin/nexus run来查看启动日志，如果遇到如下错误

WARNING: ************************************************************
WARNING: Detected execution as "root" user.  This is NOT recommended!
WARNING: ************************************************************
Starting nexus

是nexus不让使用root来启动服务。之后切换用户，报下边的错误

Java HotSpot(TM) 64-Bit Server VM warning: Cannot open file ../sonatype-work/nexus3/log/jvm.log due to Permission denied

Warning:  Cannot open log file: ../sonatype-work/nexus3/log/jvm.log
Warning:  Forcing option -XX:LogFile=/tmp/jvm.log
Unable to update instance pid: Unable to create directory /usr/local/nexus/sonatype-work/nexus3/instances
/usr/local/nexus/sonatype-work/nexus3/log/karaf.log (Permission denied)
Unable to update instance pid: Unable to create directory /usr/local/nexus/sonatype-work/nexus3/instances

是表示切换的用户没有权限操作nexus解压后生成的sonatype-work文件夹，所以需要在root下，给当前用户读写权限。

chown menghb:menghb -R sonatype-work/

之后打开***.***.***.***:8081，就能看到nexus的主页面，登录密码默认是admin/admin123,如果要改密码，可以在界面上改，如果要改端口，就去etc/nexus-default.properties去修改相关参数。