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20151123-2 选题
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How to Configure Apache Solr on Ubuntu 14 / 15
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================================================================================
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Hello and welcome to our today's article on Apache Solr. The brief description about Apache Solr is that it is an Open Source most famous search platform with Apache Lucene at the back end for Web sites that enables you to easily create search engines which searches websites, databases and files. It can index and search multiple sites and return recommendations for related contents based on the searched text.
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Solr works with HTTP Extensible Markup Language (XML) that offers application program interfaces (APIs) for Javascript Object Notation, Python, and Ruby. According to the Apache Lucene Project, Solr offers capabilities that have made it popular with administrators including it many featuring like:
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- Full Text Search
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- Faceted Navigation
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- Snippet generation/highting
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- Spell Suggestion/Auto complete
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- Custom document ranking/ordering
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#### Prerequisites: ####
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On a fresh Linux Ubuntu 14/15 with minimal packages installed, you only have to take care of few prerequisites in order to install Apache Solr.
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### 1)System Update ###
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Login to your Ubuntu server with a non-root sudo user that will be used to perform all the steps to install and use Solr.
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After successful login, issue the following command to update your system with latest updates and patches.
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$ sudo apt-get update
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### 2) JRE Setup ###
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The Solr setup needs Java Runtime Environment to be installed on the system as its basic requirement because solr and tomcat both are the Java based applications. So, we need to install and configure its home environment with latest Java.
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To install the latest version on Oracle Java 8, we need to install Python Software Properties using the below command.
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$ sudo apt-get install python-software-properties
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Upon completion, run the setup its the repository for the latest version of Java 8.
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$ sudo add-apt-repository ppa:webupd8team/java
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Now you are able to install the latest version of Oracle Java 8 with 'wget' by issuing the below commands to update the packages source list and then to install Java.
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$ sudo apt-get update
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----------
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$ sudo apt-get install oracle-java8-installer
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Accept the Oracle Binary Code License Agreement for the Java SE Platform Products and JavaFX as you will be asked during the Java installation and configuration process by a click on the 'OK' button.
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When the installation process complete, run the below command to test the successful installation of Java and check its version.
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kash@solr:~$ java -version
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java version "1.8.0_66"
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Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
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Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)
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The output indicates that we have successfully fulfilled the basic requirement of Solr by installing the Java. Now move to the next step to install Solr.
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### Installing Solr ###
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Installing Solr on Ubuntu can be done by using two different ways but in this article we prefer to install its latest package from the source.
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To install Solr from its source, download its available package with latest version from there Official [Web Page][1], copy the link address and get it using 'wget' command.
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$ wget http://www.us.apache.org/dist/lucene/solr/5.3.1/solr-5.3.1.tgz
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Run the command below to extract the archived service into '/bin' folder.
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$ tar -xzf solr-5.3.1.tgz solr-5.3.1/bin/install_solr_service.sh --strip-components=2
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Then run the script to start Solr service that will creates a new 'solr' user and then installs solr as a service.
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$ sudo bash ./install_solr_service.sh solr-5.3.1.tgz
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To check the status of Solr service, you use the below command.
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$ service solr status
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### Creating Solr Collection: ###
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Now we can create multiple collections using Solr user. To do so just run the below command by mentioning the name of the collection you want to create and by specifying its configuration set as shown.
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$ sudo su - solr -c "/opt/solr/bin/solr create -c myfirstcollection -n data_driven_schema_configs"
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We have successfully created the new core instance directory for our our first collection where we can add new data in it. To view its default schema file in directory '/opt/solr/server/solr/configsets/data_driven_schema_configs/conf' .
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### Using Solr Web ###
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Apache Solr can be accessible on the default port of Solr that 8983. Open your favorite browser and navigate to http://your_server_ip:8983/solr or http://your-domain.com:8983/solr. Make sure that the port is allowed in your firewall.
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http://172.25.10.171:8983/solr/
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From the Solr Web Console click on the 'Core Admin' button from the left bar, then you will see your first collection that we created earlier using CLI. While you can also create new cores by pointing on the 'Add Core' button.
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You can also add the document and query from the document as shown in below image by selecting your particular collection and pointing the document. Add the data in the specified format as shown in the box.
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{
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"number": 1,
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"Name": "George Washington",
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"birth_year": 1989,
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"Starting_Job": 2002,
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"End_Job": "2009-04-30",
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"Qualification": "Graduation",
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"skills": "Linux and Virtualization"
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}
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After adding the document click on the 'Submit Document' button.
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### Conclusion ###
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You are now able to insert and query data using the Solr web interface after its successful installation on Ubuntu. Now add more collections and insert you own data and documents that you wish to put and manage through Solr. We hope you have got this article much helpful and enjoyed reading this.
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--------------------------------------------------------------------------------
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via: http://linoxide.com/ubuntu-how-to/configure-apache-solr-ubuntu-14-15/
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作者：[Kashif][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/kashifs/
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[1]:http://lucene.apache.org/solr/
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How to install Android Studio on Ubuntu 15.04 / CentOS 7
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================================================================================
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With the advancement of smart phones in the recent years, Android has become one of the biggest phone platforms and all the tools required to build Android applications are also freely available. Android Studio is an Integrated Development Environment (IDE) for developing Android applications based on [IntelliJ IDEA][1]. It is a free and open source software by Google released in 2014 and succeeds Eclipse as the main IDE.
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In this article, we will learn how to install Android Studio on Ubuntu 15.04 and CentOS 7.
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### Installation on Ubuntu 15.04 ###
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We can install Android Studio in two ways. One is to set up the required repository and install it; other is to download it from the official Android site and install it locally. In the following example, we will be setting up the repo using command line and install it. Before proceeding, we need to make sure that we have JDK version1.6 or greater installed.
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Here, I'm installing JDK 1.8.
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$ sudo add-apt-repository ppa:webupd8team/java
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$ sudo apt-get update
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$ sudo apt-get install oracle-java8-installer oracle-java8-set-default
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Verify if java installation was successful:
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poornima@poornima-Lenovo:~$ java -version
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Now, setup the repo for installing Android Studio
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$ sudo apt-add-repository ppa:paolorotolo/android-studio
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$ sudo apt-get update
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$ sudo apt-get install android-studio
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Above install command will install android-studio in the directory /opt.
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Now, run the following command to start the setup wizard:
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$ /opt/android-studio/bin/studio.sh
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This will invoke the setup screen. Following are the screen shots that follow to set up Android studio:
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Once you press the Finish button, Licence agreement will be displayed. After you accept the licence, it starts downloading the required components.
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Android studio installation will be complete after this step. When you relaunch Android studio, you will be shown the following welcome screen from where you will be able to start working with your Android Studio.
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### Installation on CentOS 7 ###
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Let us now learn how to install Android Studio on CentOS 7. Here also, you need to install JDK 1.6 or later. Remember to use 'sudo' before the commands if you are not a root user. You can download the [latest version][2] of JDK. In case you already have an older version installed, remove the same before installing the new one. In the below example, I will be installing JDK version 1.8.0_65 by downloading the required rpm.
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[root@li1260-39 ~]# rpm -ivh jdk-8u65-linux-x64.rpm
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Preparing... ################################# [100%]
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Updating / installing...
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1:jdk1.8.0_65-2000:1.8.0_65-fcs ################################# [100%]
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Unpacking JAR files...
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tools.jar...
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plugin.jar...
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javaws.jar...
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deploy.jar...
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rt.jar...
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jsse.jar...
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charsets.jar...
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localedata.jar...
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jfxrt.jar...
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If Java path is not set properly, you will get error messages. Hence, set the correct path:
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export JAVA_HOME=/usr/java/jdk1.8.0_25/
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export PATH=$PATH:$JAVA_HOME
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Check if the correct version has been installed:
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[root@li1260-39 ~]# java -version
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java version "1.8.0_65"
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Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
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Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)
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If you notice any error message of the sort "unable-to-run-mksdcard-sdk-tool:" while trying to install Android Studio, you might also have to install the following packages on CentOS 7 64-bit:
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glibc.i686
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glibc-devel.i686
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libstdc++.i686
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zlib-devel.i686
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ncurses-devel.i686
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libX11-devel.i686
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libXrender.i686
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libXrandr.i686
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Let us know install studio by downloading the ide file from [Android site][3] and unzipping the same.
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[root@li1260-39 tmp]# unzip android-studio-ide-141.2343393-linux.zip
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Move android-studio directory to /opt directory
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[root@li1260-39 tmp]# mv /tmp/android-studio/ /opt/
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You can create a simlink to the studio executable to quickly start it whenever you need it.
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[root@li1260-39 tmp]# ln -s /opt/android-studio/bin/studio.sh /usr/local/bin/android-studio
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Now launch the studio from a terminal:
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[root@localhost ~]#studio
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The screens that follow for completing the installation are same as the ones shown above for Ubuntu. When the installation completes, you can start creating your own Android applications.
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### Conclusion ###
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Within a year of its release, Android Studio has taken over as the primary IDE for Android development by eclipsing Eclipse. It is the only official IDE tool that will support future Android SDKs and other Android features that will be provided by Google. So, what are you waiting for? Go install Android Studio and have fun developing Android apps.
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--------------------------------------------------------------------------------
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via: http://linoxide.com/tools/install-android-studio-ubuntu-15-04-centos-7/
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作者：[B N Poornima][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/bnpoornima/
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[1]:https://www.jetbrains.com/idea/
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[2]:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
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[3]:http://developer.android.com/sdk/index.html
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