First, you need a JDK.<\/p>\n
I ran this:<\/p>\n
\napt-get install openjdk-7-jdk\n<\/pre>\nYou can also use the Oracle JDK, but it requires signing an additional license. It also seems to involve a more convoluted installation (they make JAVA_HOME point to a symlink to the JDK, which changes as you upgrade).<\/p>\n
For me, this JDK was installed here (you may want to note this):
\n\/usr\/lib\/jvm\/java-7-openjdk-i386\/<\/p>\n
Before running the solr installation steps, go to the Solr download page, and find the current version.<\/p>\n
\nsudo su root\ncd ~\nwget http:\/\/apache.arvixe.com\/lucene\/solr\/5.5.0\/solr-5.5.0.tgz\ntar xzf solr-5.5.0.tgz solr-5.5.0\/bin\/install_solr_service.sh --strip-components=2\nsudo chmod +x install_solr_service.sh\nsudo .\/install_solr_service.sh solr-5.5.0.tgz\n<\/pre>\nTo run solr, you should then be able to run this:<\/p>\n
\nservice solr start\n<\/pre>\nHowever, this may not work at first.<\/p>\n
If you get an error that it can’t find the JDK:<\/p>\n
\nThe currently defined JAVA_HOME (\/usr\/lib\/jvm\/java-8-oracle) refers\nto a location where Java could not be found. Aborting.\nEither fix the JAVA_HOME variable or remove it from the\nenvironment so that the system PATH will be searched.\n<\/pre>\nIf this happens, do:<\/p>\n
\nvi \/etc\/default\/solr.in.sh\n<\/pre>\nAnd add this line (using the path you saved above):<\/p>\n
\nSOLR_JAVA_HOME=\"\/usr\/lib\/jvm\/java-7-openjdk-i386\"\n<\/pre>\nIf you get a permissions denied error on \/dev\/null:<\/p>\n
\n\/opt\/solr\/bin\/solr: line 120: \/dev\/null: Permission denied\nJava not found, or an error was encountered when running java.\nA working Java 7 or later is required to run Solr!\nPlease install Java or fix JAVA_HOME before running this script.\nCommand that we tried: '\/usr\/lib\/jvm\/java-7-openjdk-i386\/bin\/java -version'\nActive Path:\n\/usr\/local\/bin:\/usr\/bin:\/bin:\/usr\/local\/games:\/usr\/games:\/usr\/lib\/jvm\/java-8-oracle\/bin:\/usr\/lib\/jvm\/java-8-oracle\/db\/bin:\/usr\/lib\/jvm\/java-8-oracle\/jre\/bin\n<\/pre>\nThis indicates that \/dev\/null is a file, rather than a device. Run this:<\/p>\n
\nrm \/dev\/null\nmknod \/dev\/null c 1 3\nchmod 666 \/dev\/null\n<\/pre>\nOnce you do this, solr should work.<\/p>\n
However, you then should consider disabling external access, since the UI has no security.<\/p>\n
The best way to do this is with firewall rules, since this blocks network traffic (make sure you take a snapshot of your virtual machine before you tinker with iptables, because you can lock yourself out)<\/p>\n
\nsudo iptables -A INPUT -p tcp -s localhost --dport 8983 -j ACCEPT\nsudo iptables -A INPUT -p tcp --dport 8983 -j DROP\n<\/pre>\nIf the above causes you a problem, you can still get out by rebooting.<\/p>\n
This makes it permanent:<\/p>\n
\n\/sbin\/iptables-save\n<\/pre>\nAnother option is to limit access to your IP address, <\/a> although if your IP changes frequently this is not ideal, and it risks you losing the setting if you upgrade.<\/p>\nAlternately, since Solr by default runs on Jetty, you can restrict access to only the loopback address1<\/a><\/sup>. The disadvantage of doing this through Jetty is that it assumes you trust Solr not to open more ports without your awareness.<\/p>\nIf you go the firewall route, a handy option is SSH port forwarding, which will allow you to access the solr UI when you SSH into the box. <\/p>\n
If you use Putty this means adding \u201c-L 8983:localhost:8983\u201d to the command line arguments. Once you connect this way, you can use \u201chttp:\/\/localhost:8983\/solr\/#\/\u201d to connect to the Solr admin panel.<\/p>\n
Logging<\/b>
\nYou may also want to check the log settings. By default log rotation appears to be enabled correctly, although the file size is a bit small:<\/p>\n
File: \/opt\/solr\/server\/resources\/log4j.properties<\/p>\n
\nlog4j.appender.file=org.apache.log4j.RollingFileAppender\nlog4j.appender.file.MaxFileSize=4MB\nlog4j.appender.file.MaxBackupIndex=9\n<\/pre>\n