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Sadhan Sarker
Sadhan Sarker

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Install Nexus Repository Manager in Linux Centos7, Deploy and Use 'artifacts

#codenewbie #webdev #java #nexus

Step 1: Login to your Linux server and update the yum packages. Also install required utilities.

yum update -y sudo yum install wget -y java -version sudo yum install java-1.8.0-openjdk.x86_64 -y
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Step 2: Download the latest nexus. You can get the latest download links fo for nexus from here.

cd /opt sudo wget -O latest-unix.tar.gz https://download.sonatype.com/nexus/3/latest-unix.tar.gz tar -xvzf latest-unix.tar.gz sudo mv nexus-3* nexus mv sonatype-work nexusdata ls -lh
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Step 3: Set User/Permissions and Configurations

useradd --system --no-create-home nexus chown -R nexus:nexus /opt/nexus chown -R nexus:nexus /opt/nexusdata
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Edit /opt/nexus/bin/nexus.vmoptions file

vi /opt/nexus/bin/nexus.vmoptions
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-Xms2703m -Xmx2703m -XX:MaxDirectMemorySize=2703m -XX:+UnlockDiagnosticVMOptions -XX:+LogVMOutput -XX:LogFile=../nexusdata/nexus3/log/jvm.log -XX:-OmitStackTraceInFastThrow -Djava.net.preferIPv4Stack=true -Dkaraf.home=. -Dkaraf.base=. -Dkaraf.etc=etc/karaf -Djava.util.logging.config.file=etc/karaf/java.util.logging.properties -Dkaraf.data=../nexusdata/nexus3 -Dkaraf.log=../nexusdata/nexus3/log -Djava.io.tmpdir=../nexusdata/nexus3/tmp -Dkaraf.startLocalConsole=false
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Edit nexus.rc file.

vi /opt/nexus/bin/nexus.rc
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Uncomment run_as_user parameter and add new value.

run_as_user="nexus"
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We need to modify the nexus-default.properties file.

vi /opt/nexus/etc/nexus-default.properties
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Change application-host=0.0.0.0 and port application-host=9081

Configure the open file limit of the nexus user.

vi /etc/security/limits.conf
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Add the below values to the file.

nexus - nofile 65536
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Step 4: Set Nexus as a System Service

Create the Systemd service file in /etc/systemd/system/.

sudo vi /etc/systemd/system/nexus.service
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Add the following contents to the unit file.

[Unit] Description=Nexus Service After=syslog.target network.target [Service] Type=forking LimitNOFILE=65536 ExecStart=/opt/nexus/bin/nexus start ExecStop=/opt/nexus/bin/nexus stop User=nexus Group=nexus Restart=on-failure [Install] WantedBy=multi-user.target
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Manage Nexus Service, Execute the following command to add nexus service to boot.

systemctl daemon-reload systemctl enable nexus.service systemctl start nexus.service
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Monitor the log file.

tail -f /opt/nexusdata/nexus3/log/nexus.log
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Check the running service port.

netstat -tunlp | grep 9081
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Show default login password.

cat /opt/nexusdata/nexus3/admin.password
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Deploy and Use Artifacts in Spring Boot Project

Create or Edit this ~/.m2/settings.xml file:

vi ~/.m2/settings.xml
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Update contents of the file.

<settings xmlns="http://maven.apache.org/SETTINGS/1.2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0 http://maven.apache.org/xsd/settings-1.2.0.xsd"> <!-- unblock so that we can download artifacts from nexus repo --> <mirrors> <mirror> <id>maven-default-http-blocker</id> <mirrorOf>dummy</mirrorOf> <name>Dummy mirror to override default blocking mirror that blocks http</name> <url>http://0.0.0.0/</url> </mirror> </mirrors> <!--nexus server configuration--> <servers> <server> <id>nexus</id> <username>admin</username> <password>19e36q29-1e09-42ce-af29-4f74563a7467</password> </server> </servers> </settings>
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Deploy jar or artifact to nexus server

  1. Now create a maven project. Open pom.xml file, and add this content inside project tag. 
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <!-- ...other --> <!-- deploy libs to nexus repository --> <distributionManagement> <repository> <id>nexus</id> <url>http://119.168.0.0:9081/repository/sadhan</url> <!--<name>Nexus Releases</name>--> </repository> <snapshotRepository> <id>nexus</id> <url>http://119.168.0.0:9081/repository/sadhan</url> <!--<name>Nexus Snapshot</name>--> </snapshotRepository> </distributionManagement> </project>
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Now hit the following command to deploy jar to nexus repository.

mvn deploy mvn deploy -e mvn deploy -e release mvn deploy -DaltDeploymentRepository=nexus::default::http://119.168.0.0:9081/repository/sadhan
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Use and download jar/artifact from nexus server

  1. Now pull the jar file from nexus repository.

Makes sure ~/.m2/setting.xml file copied properly.

Now open pom.xml file and add this upload dependency inside dependencies tag.

<dependency> <groupId>com.revesoft</groupId> <artifactId>olm</artifactId> <version>0.0.1</version> </dependency>
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Then add this below content inside project tag.

 <!--to use nexus repositories we need that --> <repositories> <repository> <id>nexus</id> <url>http://119.168.0.0:9081/repository/sadhan/</url> <!--<name>Nexus Releases</name>--> </repository> </repositories>
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Using CLI, we can download the jar file from nexus repository.

mvn dependency:resolve -DremoteRepositories=nexus::default::http://119.168.0.0:9081/repository/sadhan
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Note: Here id nexus is the same as in ~/.m2/settings.xml file. so use same it to download the jar file.

Optional

Upload blob file to nexus repository.

curl -v --user 'admin:admin123' --upload-file ./test.png http://localhost:9081/repository/documentation/test.png
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Congratulations

I hope we learn something exciting about Nexus. Thanks for time & passion. Feel free to ask me anything.

Say Hi to me on Twitter, Linkedin, and Medium where I keep on sharing interesting updates.

References

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