Ganglia安装配置与监控Solr

Ganglia的安装，可以使用yum和rpm来进行，对于刚装的系统需要分别执行以下几个命令，来完成初始化安装：


<pre name="code" class="java">yum install –y wget apr-devel apr-util check-devel cairo-devel pango-devel libxml2-devel rpmbuild glib2-devel dbus-devel freetype-devel fontconfig-devel gcc-c++ expat-devel python-devel libXrender-devel rrdtool*

rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
rpm -ivh http://github.com/downloads/jmxtrans/jmxtrans/jmxtrans-20121016.145842.6a28c97fbb-0.noarch.rpm

yum install ganglia*
</pre>
安装完成后，即可配置。

1， 修改ganglia的conf配置，
    修改 /etc/ganglia/gmetad.conf，数据源的配置
    data_source "solr cluster" 127.0.0.1
集群IP，可以设置多个IP地址，也可以设置多个数据源。


2，修改 /etc/ganglia/gmond.conf的配置，把name对应起来
cluster {
  name = "solr cluster"
  owner = "unspecified"
  latlong = "unspecified"
  url = "unspecified"
}
3，修改/etc/httpd/conf.d/ganglia.conf，Apache的配置，不拦截ganglia的数据包
  Alias /ganglia /usr/share/ganglia

  <Location /ganglia>
    Order deny,allow
    Allow  from all
    Allow from 192.168.46.21
    Allow from ::1
    # Allow from .example.com
  </Location>


4，cd  /var/lib/jmxtrans
配置jmxtrans
添加solr.json

solr.json的配置如下：

<pre name="code" class="java">{
    "servers" : [
    {
        "host" : "192.168.46.23",
        "alias" : "solr23",
        "port" : "3000",
        "queries" : [
        {
            "obj" : "java.lang:type=Memory",
            "resultAlias": "solr23.heap",
            "attr" : [ "HeapMemoryUsage", "NonHeapMemoryUsage" ],
            "outputWriters" : [
             {
                 "@class" : "com.googlecode.jmxtrans.model.output.GangliaWriter",
                 "settings" : {
                     "groupName" : "Solr-JVM",
                     "host" : "239.2.11.71",
                     "port" : "8649"
                 }
             }]
        },
        {
            "obj" : "java.lang:name=CMS Old Gen,type=MemoryPool",
            "resultAlias": "solr23.cmsoldgen",
            "attr" : [ "Usage" ],
            "outputWriters" : [
             {
                 "@class" : "com.googlecode.jmxtrans.model.output.GangliaWriter",
                 "settings" : {
                     "groupName" : "Solr-JVM",
                     "host" : "239.2.11.71",
                     "port" : "8649"
                 }
             }]
        },
        {
            "obj" : "java.lang:type=GarbageCollector,name=*",
            "resultAlias": "solr23.gc",
            "attr" : [ "CollectionCount", "CollectionTime" ],
            "outputWriters" : [
             {
                 "@class" : "com.googlecode.jmxtrans.model.output.GangliaWriter",
                 "settings" : {
                     "groupName" : "Solr-JVM",
                     "host" : "239.2.11.71",
                     "port" : "8649"
                 }
             }]
        },
        {
            "obj" : "java.lang:type=Threading",
            "resultAlias": "solr23.threads",
            "attr" : [ "DaemonThreadCount", "PeakThreadCount", "ThreadCount", "TotalStartedThreadCount" ],
            "outputWriters" : [
             {
                 "@class" : "com.googlecode.jmxtrans.model.output.GangliaWriter",
                 "settings" : {
                     "groupName" : "Solr-JVM",
                     "host" : "239.2.11.71",
                     "port" : "8649"
                 }
             }]
        },
        {
            "obj" : "solr/collection1:type=queryResultCache,id=org.apache.solr.search.LRUCache",
            "resultAlias": "solr23.queryCache",
            "attr" : [ "warmupTime","size","lookups","evictions","hits","hitratio","inserts","cumulative_lookups","cumulative_hits","cumulative_hits","cumulative_hitratio","cumulative_inserts","cumulative_evictions" ],
            "outputWriters" : [
            {
                "@class" : "com.googlecode.jmxtrans.model.output.GangliaWriter",
                "settings" : {
                    "groupName" : "Solr-JVM",
                    "host" : "239.2.11.71",
                    "port" : "8649"
                }
            }]
        },
        {
            "obj" : "solr/collection1:type=searcher,id=org.apache.solr.search.SolrIndexSearcher",
           "resultAlias": "solr23.searcher",
            "attr" : [ "maxDoc","numDocs","warmupTime" ],
            "outputWriters" : [
            {
                "@class" : "com.googlecode.jmxtrans.model.output.GangliaWriter",
                "settings" : {
                    "groupName" : "Solr-JVM",
                    "host" : "239.2.11.71",
                    "port" : "8649"
                }
            }]
        }]
    }]
}


</pre>


配置完成后，需要依次，启动如下服务：

<pre name="code" class="java">service httpd start  //启动apache服务
/etc/init.d/gmetad start   //启动绘图服务
/etc/init.d/gmond start   //启动数据收集服务
这个放在solr前执行  jmx
/etc/init.d/jmxtrans start  //启动jmx
/home/solr/start-solr.sh  //启动solr
</pre>
注意，solr启动的jetty的jar需要加上JMX的监控参数，内容如下：
<pre name="code" class="java">java -Djava.rmi.server.hostname=192.168.46.23    -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=3000 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -jar start.jar </pre>

最后需要注意一点，为了防止访问apache服务出错，
如果出现：There was an error collecting ganglia data (127.0.0.1:8652): fsockopen error: Permission denied  .  错误，我们需要进行以下的设置：
<pre name="code" class="java">（1）：临时可以使用命令setenforce 0来关闭selinux而不需要重启，刷新页面，即可访问！
（2）:永久的使用，需要关闭selinux：vi /etc/selinux/config，把SELINUX=enforcing改成SELINUX=disable；需要重启机器。
</pre>
一切完成后，我们就是访问我们本机的ip地址，看到的界面如下所示：





到此，我们的单机监控solr的demo，就部署成功了，以同样的方式，我们还可以对hadoop进行监控，另外我们还可以配置多个datasource来监控多个应用。