1:下載maven
    wget http://mirrors.hust.edu.cn/apache/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.tar.gz
2:解壓安裝
    tar zxf apache-maven-3.5.4-bin.tar.gz
3:環境變數配置
    vi /ect/profile
    export MAVEN_HOME=/usr/local/apache-maven-3.5.4
    export PATH=$PATH:$MAVEN_HOME/bin
    source /ect/profile
    mvn -version

4:安裝Nexus
    1:下載安裝
        wget https://sonatype-download.global.ssl.fastly.net/nexus/3/nexus-3.9.0-01-unix.tar.gz
        tar -xvf nexus-3.9.0-01-unix.tar.gz
    2:檢視配置檔案
        /usr/local/nexus-3.9.0-01/etc/nexus-default.properties
    3:nexus啟動
        nexus start/stop/restart
5:更換maven配置檔案settings.xml

<localRepository>/usr/local/repository</localRepository>

    <pluginGroups>
        <pluginGroup>org.apache.maven.plugins</pluginGroup>
    </pluginGroups>

    <servers>   
        <server>  
            <id>maven-release</id>  
            <username>admin</username>  
            <password>admin123</password>  
        </server>  
        <server>   
            <id>maven-snapshots</id>  
            <username>admin</username>  
            <password>admin123</password>  
        </server>
        <server>   
            <id>maven-thirdParty</id>  
            <username>admin</username>  
            <password>admin123</password>  
        </server>
    </servers>

    </mirrors>
        <mirror>
            <id>nexus</id>
            <url>http://192.168.1.128:8081/repository/maven-public/</url>
            <mirrorOf>*</mirrorOf>
        </mirror>
    </mirrors>

    <profiles>
        <profile>
            <id>nexus</id>
            <repositories>
                <repository>
                    <id>maven-public</id>
                    <url>http://192.168.1.128:8081/repository/maven-public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>maven-public</id>
                    <url>http://192.168.1.128:8081/repository/maven-public/</url>
                    <releases>
                         <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </pluginRepository>
            </pluginRepositories>
        </profile>
    </profiles>  

    <activeProfiles>  
        <activeProfile>nexus</activeProfile>  
    </activeProfiles>
 

6:配置許可權(不配置,可能導致jar包下載不下來)
    chown jenKins:jenkins /usr/local/repository
    chmod 755 /usr/local/repository