Ganglia的安装与部署

安装httpd服务与php

[liujh@hadoop102 flume]$ sudo yum -y install httpd php

安装其他依赖

[liujh@hadoop102 flume]$ sudo yum -y install rrdtool perl-rrdtool rrdtool-devel
[liujh@hadoop102 flume]$ sudo yum -y install apr-devel

安装ganglia

[liujh@hadoop102 flume]$ sudo rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
[liujh@hadoop102 flume]$ sudo yum -y install ganglia-gmetad 
[liujh@hadoop102 flume]$ sudo yum -y install ganglia-web
[liujh@hadoop102 flume]$ 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，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。

修改配置文件/etc/httpd/conf.d/ganglia.conf

[liujh@hadoop102 flume]$ sudo vim /etc/httpd/conf.d/ganglia.conf
修改为红颜色的配置：
# 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
</Location>

修改配置文件/etc/ganglia/gmetad.conf

[liujh@hadoop102 flume]$ sudo vim /etc/ganglia/gmetad.conf
修改为：
data_source "hadoop102" 192.168.1.102

修改配置文件/etc/ganglia/gmond.conf

[liujh@hadoop102 flume]$ sudo vim /etc/ganglia/gmond.conf 
修改为：
cluster {
  name = "hadoop102"
  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 = 192.168.1.102
  port = 8649
  ttl = 1
}
udp_recv_channel {
  # mcast_join = 239.2.11.71
  port = 8649
  bind = 192.168.1.102
  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
}

修改配置文件/etc/selinux/config

[liujh@hadoop102 flume]$ 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
尖叫提示：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：
[liujh@hadoop102 flume]$ sudo setenforce 0

启动ganglia

[liujh@hadoop102 flume]$ sudo service httpd start
[liujh@hadoop102 flume]$ sudo service gmetad start
[liujh@hadoop102 flume]$ sudo service gmond start

打开网页浏览ganglia页面

http://192.168.1.102/ganglia
尖叫提示：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：

[liujh@hadoop102 flume]$ sudo chmod -R 777 /var/lib/ganglia

操作Flume测试监控

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"

启动Flume任务

[liujh@hadoop102 flume]$ bin/flume-ng agent \
--conf conf/ \
--name a1 \
--conf-file job/flume-netcat-logger.conf \
-Dflume.root.logger==INFO,console \
-Dflume.monitoring.type=ganglia \
-Dflume.monitoring.hosts=192.168.1.102:8649

发送数据观察ganglia监测图

[liujh@hadoop102 flume]$ nc localhost 44444

image.png

图例说明：

字段（图表名称）	字段含义
EventPutAttemptCount	source尝试写入channel的事件总数量
EventPutSuccessCount	成功写入channel且提交的事件总数量
EventTakeAttemptCount	sink尝试从channel拉取事件的总数量。这不意味着每次事件都被返回，因为sink拉取的时候channel可能没有任何数据
EventTakeSuccessCount	sink成功读取的事件的总数量
StartTime	channel启动的时间（毫秒）
StopTime	channelchannel停止的时间（毫秒）
ChannelSize	目前channel中事件的总数量
ChannelFillPercentage	channel占用百分比
ChannelCapacity	channel的容量