Ganglia的安装与部署

1 ganglia部署规划
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。

hadoop102: gweb, gmetad, gmond 
hadoop103: gmond
hadoop104: gmond

2 三台主机安装epel源
epel是基于Fedora的一个项目, 装上了 EPEL，就像在 Fedora 上一样，可以通过 yum install package-name安装软件。

[jl@hadoop102 flume]$ sudo yum install -y epel-release
[jl@hadoop103 flume]$ sudo yum install -y epel-release
[jl@hadoop104 flume]$ sudo yum install -y epel-release

3 安装
在hadoop102安装web, meta和monitor

[jl@hadoop102 flume]$ sudo yum -y install ganglia-gmetad ganglia-web ganglia-gmond

在hadoop103和hadoop104上安装monitor

[jl@hadoop103 flume]$ sudo yum -y install ganglia-gmond
[jl@hadoop104 flume]$ sudo yum -y install ganglia-gmond

说明：如果出现安装失败，出现如下报错：

One of the configured repositories failed (Unknown), and yum doesn't have enough cached data to continue

需要清理一下yum缓存，有时清理一次不成功，就多执行几次。

[jl@hadoop102 flume]$sudo yum clean all

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

[jl@hadoop102 flume]$ sudo vim /etc/httpd/conf.d/ganglia.conf

修改配置：

#
# Ganglia monitoring system php web frontend
#

Alias /ganglia /usr/share/ganglia

<Location /ganglia>
#Require local
#虚拟网卡的主机地址，查看VMnet8状态可以得到
Require ip 192.168.5.1 
#Require granted all  允许都可以访问
  # Require ip 10.1.2.3
  # Require host example.org
</Location>

（2）修改配置文件/etc/ganglia/gmetad.conf

[jl@hadoop102 flume]$ sudo vim /etc/ganglia/gmetad.conf

修改为：

data_source "hadoop102" hadoop102

（3）修改配置文件/etc/ganglia/gmond.conf

[jl@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 = hadoop102
  port = 8649
  ttl = 1
}
udp_recv_channel {
  # mcast_join = 239.2.11.71
  port = 8649
  bind = 0.0.0.0
  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
}

将修改后的文件同步到hadoop103和hadoop104。
（4）修改配置文件/etc/selinux/config

[jl@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

selinux本次生效关闭必须重启，如果此时不想重启，可以临时使其生效。

[jl@hadoop102 flume]$ sudo setenforce 0

5 启动ganglia的三个后台
主机：hadoop102

[jl@hadoop102 flume]$ sudo systemctl start gmond
[jl@hadoop102 flume]$ sudo systemctl start gmetad
[jl@hadoop102 flume]$ sudo systemctl start httpd

主机：hadoop103

[jl@hadoop103 flume]$ sudo systemctl start gmond

主机：hadoop104

[jl@hadoop104 flume]$ sudo systemctl start gmond

可以使用ps -aux | grep gmond 查看线程运行情况。
6 网页查看ganglia页面

http://hadoop102:ganglia

如果完成以上操作依然出现权限不足的错误，可以修改/var/lib/ganglia目录的权限：

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

最后

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