一. 安装Ganglia

1. 安装httpd服务与php

sudo yum -y install httpd php

2. 安装其他依赖

sudo yum -y install rrdtool perl-rrdtool rrdtool-develsudo yum -y install apr-devel

3. 安装ganglia

sudo rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpmsudo yum -y install ganglia-gmetad sudo yum -y install ganglia-websudo yum install -y ganglia-gmond

Ganglia由gmond、gmetad和gweb三部分组成。

gmond（Ganglia Monitoring Daemon）是一种轻量级服务，安装在每台需要收集指标数据的节点主机上。使用gmond，你可以很容易收集很多系统指标数据，如CPU、内存、磁盘、网络和活跃进程的数据等。

gmetad（Ganglia Meta Daemon）整合所有信息，并将其以RRD格式存储至磁盘的服务。

gweb（Ganglia Web）Ganglia可视化工具，gweb是一种利用浏览器显示gmetad所存储数据的PHP前端。在Web界面中以图表方式展现集群的运行状态下收集的多种不同指标数据。

4. 修改配置文件

sudo vim /etc/httpd/conf.d/ganglia.conf

#修改为
# Ganglia monitoring system php web frontendAlias /ganglia /usr/share/ganglia<Location /ganglia> Order deny,allow  #Deny from all Allow from all # Allow from 127.0.0.1 # Allow from ::1 # Allow from .example.com</Location>

sudo vim /etc/ganglia/gmetad.conf

#修改为
data_source "hadoop100" 192.168.1.100

sudo vim /etc/ganglia/gmond.conf

#修改为cluster { name = "hadoop100" owner = "unspecified" latlong = "unspecified" url = "unspecified"}udp_send_channel { #bind_hostname = yes # Highly recommended, soon to be default. # This option tells gmond to use a source address # that resolves to the machine‘s hostname. Without # this, the metrics may appear to come from any # interface and the DNS names associated with # those IPs will be used to create the RRDs.  # mcast_join = 239.2.11.71 host = 192.168.1.100 port = 8649 ttl = 1}udp_recv_channel {  # mcast_join = 239.2.11.71 port = 8649 bind = 192.168.1.100 retry_bind = true # Size of the UDP buffer. If you are handling lots of metrics you really # should bump it up to e.g. 10MB or even higher. # buffer = 10485760}

sudo vim /etc/selinux/config

#修改为
# This file controls the state of SELinux on the system.# SELINUX= can take one of these three values:# enforcing - SELinux security policy is enforced.# permissive - SELinux prints warnings instead of enforcing.# disabled - No SELinux policy is loaded.SELINUX=disabled# SELINUXTYPE= can take one of these two values:# targeted - Targeted processes are protected,# mls - Multi Level Security protection.SELINUXTYPE=targeted

#脱裤提醒 : selinux本次生效关闭必须重启，如果此时不想重启，可以临时生效之：sudo setenforce 0

5. 启动ganglia

sudo service httpd startsudo service gmetad startsudo service gmond start

6. 打开ganglia浏览页面

http://192.168.1.100/ganglia

脱裤提示：如果完成以上操作依然出现权限不足错误，请修改/var/lib/ganglia目录的权限：sudo chmod -R 777 /var/lib/ganglia

二. 操作Flume测试监控

1. 修改配置文件

#修改/opt/module/flume/conf目录下的flume-env.sh配置：JAVA_OPTS="-Dflume.monitoring.type=ganglia-Dflume.monitoring.hosts=192.168.1.102:8649-Xms100m-Xmx200m"

2. 启动Flume任务

bin/flume-ng agent --conf conf/--name a1 --conf-file jobs/flume-netcat-logger.conf -Dflume.root.logger==INFO,console -Dflume.monitoring.type=ganglia -Dflume.monitoring.hosts=192.168.1.100:8649

3. 发送数据观察ganglia监测图

nc localhost 44444

图例说明: