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nexus是广为人知的搭建maven私有仓库的工具。
本文记录nexus在安装配置过程中的一些笔记。
使用docker安装nexus
docker-compose.yml配置:
version: '2'services: nexus: image: sonatype/nexus3:3.2.0 ports: - 8081:8081 volumes: - /mnt/nexus-data:/nexus-data:Z
第一次启动时会报错,提示挂载的目录写权限不足。需要修改一下挂载目录的所有者:
mkdir nexus-data && chown -R 200 /mnt/nexus-data
参考文档:
https://github.com/sonatype/docker-nexus3
在maven配置文件内,设置私有仓库的账号密码。
有两个地方可以修改maven配置。
一个是global配置。
mac下:如果是使用brew安装:/usr/local/Cellar/maven/3.3.9/libexec/conf/settings.xml
centOS下: /usr/local/apache-maven-3.3.9/conf/settings.xml
Intellij IDE:/Applications/IntelliJ IDEA.app/Contents/plugins/maven/lib/maven3/conf/settings.xml
一个是当前用户的配置:~/.m2/settings.xml
该文件默认不存在,手动创建后, 会覆盖global的配置。
创建settings.xml文件,并将代码拷贝进去:
<settings> <mirrors> <mirror> <!--This sends everything else to /public --> <id>nexus</id> <mirrorOf>*</mirrorOf> <url>http://localhost:8081/repository/maven-public/</url> </mirror> </mirrors> <profiles> <profile> <id>nexus</id> <!--Enable snapshots for the built in central repo to direct --> <!--all requests to nexus via the mirror --> <repositories> <repository> <id>central</id> <url>http://central</url> <releases><enabled>true</enabled></releases> <snapshots><enabled>true</enabled></snapshots> </repository> </repositories> <pluginRepositories> <pluginRepository> <id>central</id> <url>http://central</url> <releases><enabled>true</enabled></releases> <snapshots><enabled>true</enabled></snapshots> </pluginRepository> </pluginRepositories> </profile> </profiles> <activeProfiles> <!--make the profile active all the time --> <activeProfile>nexus</activeProfile> </activeProfiles><servers> <server> <id>nexus</id> <username>admin</username> <password>admin123</password> </server> </servers></settings>
将<mirror><url>
标签内的地址修改成nexus服务的地址。<servers>
标签内填写nexus服务的账号密码,发布maven项目到nexus时,需要用到。<server><id>
下id需要跟<mirror><id>
一致。
拉取maven项目
当拉取maven项目时,流程是:
-
nexus检查本地是否存在该项目。
-
如果存在, 直接将该项目返回给客户端。
-
如果不存在,从maven官方仓库中拉取项目,并保存到本地。之后返回给客户端。
在nexus的web页面上,可以搜索到之前拉取的项目。
search2.png
发布项目到nexus仓库
首先在项目的pom.xml文件内,指定发布地址:
<distributionManagement> <repository> <id>nexus</id> <name>Releases</name> <url>http://{your-nexus-ip}/repository/maven-releases</url> </repository> <snapshotRepository> <id>nexus</id> <name>Snapshot</name> <url>http://{your-nexus-ip}/repository/maven-snapshots</url> </snapshotRepository> </distributionManagement>
此处注意:release版本要配置到<repository>
标签内。snapshot版本配置到<snapshotRepository>
标签内。
使用命令发布项目:mvn clean deploy
log显示上传发布的地址:
[INFO] --- maven-install-plugin:2.5.2:install (default-install) @ base ---[INFO] Installing /Users/Franklin/Documents/work/hldh/cloud/cloud-base-repo/pom.xml to /Users/Franklin/.m2/repository/com/hldh/cloud/base/1.0-SNAPSHOT/base-1.0-SNAPSHOT.pom[INFO] [INFO] --- maven-deploy-plugin:2.8.2:deploy (default-deploy) @ base ---Downloading: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/1.0-SNAPSHOT/maven-metadata.xmlDownloaded: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/1.0-SNAPSHOT/maven-metadata.xml (591 B at 2.7 KB/sec)Uploading: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/1.0-SNAPSHOT/base-1.0-20170107.083838-2.pomUploaded: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/1.0-SNAPSHOT/base-1.0-20170107.083838-2.pom (6 KB at 24.7 KB/sec)Downloading: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/maven-metadata.xmlDownloaded: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/maven-metadata.xml (276 B at 2.8 KB/sec)Uploading: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/1.0-SNAPSHOT/maven-metadata.xmlUploaded: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/1.0-SNAPSHOT/maven-metadata.xml (591 B at 3.0 KB/sec)Uploading: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/maven-metadata.xmlUploaded: http://nexus.store.com/repository/maven-snapshots/com/hldh/cloud/base/maven-metadata.xml (276 B at 1.1 KB/sec)
说明项目已经发布到nexus上了。
这时候在nexus的web页面上, 就能search到刚刚发布的项目了:
search.png
上传第三方jar包到nexus
发布不带pom文件的独立jar包:
mvn deploy:deploy-file -DgroupId=<group-id> \ -DartifactId=<artifact-id> \ -Dversion=<version> \ -Dpackaging=<type-of-packaging> \ -Dfile=<path-to-file> \ -DrepositoryId=<id-to-map-on-server-section-of-settings.xml> \ -Durl=<url-of-the-repository-to-deploy>
-DrepositoryId
的值即为在setttings.xml里面配置的server id。
默认情况下,maven会自动为jar包创建pom文件,如果只想保留独立jar包,可以使用参数关闭这个特性:-DgeneratePom=false
发布带有pom的jar包
mvn deploy:deploy-file -DpomFile=<path-to-pom> \ -Dfile=<path-to-file> \ -DrepositoryId=<id-to-map-on-server-section-of-settings.xml> \ -Durl=<url-of-the-repository-to-deploy>
参考:
https://maven.apache.org/guides/mini/guide-3rd-party-jars-remote.html
使用nexus常见错误分析
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Request Entity Too Large
[INFO] ------------------------------------------------------------------------[INFO] BUILD FAILURE[INFO] ------------------------------------------------------------------------[INFO] Total time: 0.984 s[INFO] Finished at: 2017-01-08T15:20:02+08:00[INFO] Final Memory: 12M/309M[INFO] ------------------------------------------------------------------------[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.7:deploy-file (default-cli) on project standalone-pom: Failed to deploy artifacts: Could not transfer artifact emay:emayclient:jar:4.3.4 from/to nexus (http://nexus.store.com/repository/maven-releases/): Failed to transfer file: http://nexus.store.com/repository/maven-releases/emay/emayclient/4.3.4/emayclient-4.3.4.jar. Return code is: 413, ReasonPhrase: Request Entity Too Large. -> [Help 1]
原因:nexus服务使用了nginx做反向代理,jar包的大小超过了nginx所允许的范围。
解决方法:修改nginx.conf配置,将client_max_body_size
设置为一个较大的值:
server { client_max_body_size 10M; listen 80; server_name localhost; location / { proxy_pass http://127.0.0.1:8000/; } }
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maven编译时,报错:
Failure to find org.jfrog.maven.annomojo:maven-plugin-anno:jar:1.4.0 in http://myrepo:80/artifactory/repo was cached in the local repository, resolution will not be reattempted until the update interval of MyRepo has elapsed or updates are forced -> [Help 1]
原因:服务器之前是使用的官方maven库拉取依赖,本地已经存在jar包,配置了nexus仓库之后,跟之前本地的jar包产生了冲突。
解决方法:删除~/.m2/repository目录下对应的jar包。 或者干脆从新download一遍所有jar包。
mvn clean install -U
-U表示强制更新所有依赖
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拉取到本地的第三方库,只有lastUpdated文件,却不见pom和jar文件:
本地报错:
[WARNING] The POM for xxx.jar is missing, no dependency information available
我一直以为是nexus有bug,代理maven中央仓库时出错。
最后找了好久,发现原来是这个库的groupId改了,而且它还删除了maven中央仓库的groupId对应的包,maven找不到对应的pom和jar包,就只会创建lastUpdated文件。
这次更坚信了nexus的代理机制是很健壮的,出问题一般都是自己本地的问题。
nexus官方文档:
http://books.sonatype.com/nexus-book/reference3/maven.html#maven-sect-single-group