本文已参与「新人创作礼」活动，一起开启掘金创作之路。

一 Ganglia的安装与部署

安装httpd服务与php
sudo yum -y install httpd php
安装其他依赖
sudo yum -y install rrdtool perl-rrdtool rrdtool-devel
sudo yum -y install apr-devel
安装ganglia
sudo rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
sudo yum -y install ganglia-gmetad
sudo yum -y install ganglia-web
sudo 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，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。

1 修改配置文件/etc/httpd/conf.d/ganglia.conf

sudo vim /etc/httpd/conf.d/ganglia.conf
添加
# Ganglia monitoring system php web frontend
Alias /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
  Require all granted
</Location>

2 修改配置文件/etc/ganglia/gmetad.conf

sudo vim /etc/ganglia/gmetad.conf
修改
data_source "my cluster" 10.84.126.2（本机的ip地址）

3 修改配置文件/etc/ganglia/gmond.conf

sudo vim /etc/ganglia/gmond.conf
修改
cluster {
  name = "my cluster"
  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=10.84.126.2
  port = 8649
  ttl = 1
}

udp_recv_channel {
  #mcast_join = 239.2.11.71
  port = 8649
  bind = 10.84.126.2
  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
}

4 修改配置文件/etc/selinux/config

sudo vim /etc/selinux/config
修改
# 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

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：

5 启动ganglia

sudo service httpd start
sudo service gmetad start
sudo service gmond start

6 打开网页浏览ganglia页面

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

http://10.84.126.2/ganglia

二操作Flume测试监控

1 修改/opt/module/flume/conf目录下的flume-env.sh配置

cd /opt/module/flume/conf/
mv flume-env.sh.template flume-env.sh
添加
JAVA_OPTS="-Dflume.monitoring.type=ganglia
-Dflume.monitoring.hosts=10.84.126.2:8649
-Xms100m
-Xmx200m"

2 启动Flume任务

flume-ng agent -n a1 -c conf/ -f job/flume-netcat-logger.conf -Dflume.root.logger=INFO,console \
-Dflume.monitoring.type=ganglia \
-Dflume.monitoring.hosts=10.84.126.2:8649
再次启动一个客户端
nc localhost 44444

Flume基础【Ganglia的安装与部署、操作Flume测试监控】