单层gmetad高可用

虽然gmetad可以多层，但是层层gmetad都需要开启gweb，还是很麻烦。如果只是担心一个gmetad不安全，可以做成gmetad高可用，但是我还不知道有没有想hadoop ha那样自动failover的办法。

资源安排：

1.

hdp1：gmetad、gmond、gweb

hdp2：gmetad、gmond、gweb

hdp3：gmond

配置目的：

hdp1和hdp2的gmetad、gweb高可用，每个节点的gweb都可以展示整个集群的数据

hdp1、2、3均属于一个集群

配置文件：

hdp3——gmond.conf：

cluster {

name = "hdp3"

owner = "unspecified"

latlong = "unspecified"

url = "unspecified"

}

/* The host section describes attributes of the host, like the location */

host {

location = "unspecified"

}

/* Feel free to specify as many udp_send_channels as you like.  Gmond

used to only support having a single channel */

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 = hdp1

port = 8649

ttl = 1

}

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 = hdp2

port = 8649

ttl = 1

}

/* You can specify as many udp_recv_channels as you like as well. */

udp_recv_channel {

#mcast_join = 239.2.11.71

#port = 8649

#bind = 239.2.11.71

#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

}

/* You can specify as many tcp_accept_channels as you like to share

an xml description of the state of the cluster */

tcp_accept_channel {

#port = 8649

# If you want to gzip XML output

gzip_output = no

}

hdp1——gmond.conf：

cluster {

name = "hdp3"

owner = "unspecified"

latlong = "unspecified"

url = "unspecified"

}

/* The host section describes attributes of the host, like the location */

host {

location = "unspecified"

}

/* Feel free to specify as many udp_send_channels as you like.  Gmond

used to only support having a single channel */

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 = hdp1

port = 8649

ttl = 1

}

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 = hdp2

port = 8649

ttl = 1

}

/* You can specify as many udp_recv_channels as you like as well. */

udp_recv_channel {

#mcast_join = 239.2.11.71

port = 8649

#bind = 239.2.11.71

}

/* You can specify as many tcp_accept_channels as you like to share

an xml description of the state of the cluster */

tcp_accept_channel {

port = 8649

}

hdp1——gmetad.conf:

[root@hdp1 ganglia]# grep -v ^# gmetad.conf

data_source "hdp3" localhost

RRAs "RRA:AVERAGE:0.5:1:244" "RRA:AVERAGE:0.5:24:244" "RRA:AVERAGE:0.5:168:244" "RRA:AVERAGE:0.5:672:244" \

gridname "HDP"

all_trusted on

setuid_username ganglia

xml_port 8651

interactive_port 8652

case_sensitive_hostnames 0

hdp2——gmond.conf:

效仿hdp1的配置即可

效果达到配置目的

2.

hdp1、2、3分属3个集群，hdp1、2为gmetad高可用

则原理为：hdp1、2分别用gmetad去轮询hdp1、2、3的gmond节点（生产中的汇聚节点）

所需配置与单gmetad无异，gmetad复制一份到备份gmetad节点即可