Question

我正在尝试按NutchTutorial：

运行基本抓取

bin/nutch crawl urls -dir crawl -depth 3 -topN 5

所以我安装了Nutch并安装了Solr。我将{JAVA_HOME'设置为.bashrc到/usr/lib/jvm/java-1.6.0-openjdk-amd64。

当我从nutch主目录运行bin/nutch时，我没有看到任何问题，但是当我尝试按上述方式运行爬网时，我收到以下错误：

log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: /usr/share/nutch/logs/hadoop.log (Permission denied)
        at java.io.FileOutputStream.openAppend(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:207)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
        at org.apache.log4j.FileAppender.setFile(FileAppender.java:290)
        at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:164)
        at org.apache.log4j.DailyRollingFileAppender.activateOptions(DailyRollingFileAppender.java:216)
        at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:257)
        at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:133)
        at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:97)
        at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:689)
        at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:647)
        at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:544)
        at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:440)
        at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:476)
        at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:471)
        at org.apache.log4j.LogManager.<clinit>(LogManager.java:125)
        at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:270)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
        at org.apache.nutch.crawl.Crawl.<clinit>(Crawl.java:43)
log4j:ERROR Either File or DatePattern options are not set for appender [DRFA].
solrUrl is not set, indexing will be skipped...
crawl started in: crawl
rootUrlDir = urls
threads = 10
depth = 3
solrUrl=null
topN = 5
Injector: starting at 2013-06-28 16:24:53
Injector: crawlDb: crawl/crawldb
Injector: urlDir: urls
Injector: Converting injected urls to crawl db entries.
Injector: total number of urls rejected by filters: 0
Injector: total number of urls injected after normalization and filtering: 1
Injector: Merging injected urls into crawl db.
Exception in thread "main" java.io.IOException: Job failed!
        at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1357)
        at org.apache.nutch.crawl.Injector.inject(Injector.java:296)
        at org.apache.nutch.crawl.Crawl.run(Crawl.java:132)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
        at org.apache.nutch.crawl.Crawl.main(Crawl.java:55)

我怀疑它可能与文件权限有关，因为我必须在此服务器上的几乎所有内容上运行sudo，但如果我使用sudo运行相同的crawl命令，我会得到：

Error: JAVA_HOME is not set.

所以我觉得我在这里遇到了陷阱22。我是否应该能够使用sudo运行此命令，或者我还需要做其他事情，以便我不必使用sudo运行它并且它可以工作，或者还有其他什么完全在这里？

Answer 1

作为普通用户，您似乎无权写入/usr/share/nutch/logs/hadoop.log，这有助于作为安全功能。

要解决此问题，请创建一个简单的bash脚本：

#!/bin/sh
export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-amd64
bin/nutch crawl urls -dir crawl -depth 3 -topN 5

将其另存为nutch.sh，然后使用sudo：

运行它

sudo sh nutch.sh

Answer 2

解决此问题的关键是将JAVA_HOME变量添加到sudo环境中。例如，键入env和sudo env，您会看到JAVA_HOME未设置sudo。要解决此问题，您需要添加路径。

运行sudo visudo以修改/etc/sudoers文件。（不要使用标准文本编辑器。这个特殊的vi文本编辑器将在允许您保存之前验证语法。）
添加以下行：
```
Defaults env_keep+="JAVA_HOME"
```
在Defaults env_keep部分的末尾。
重新启动

无法获取apache nutch来抓取 - 权限和JAVA_HOME被怀疑

2 个答案: