上一篇文章简单的介绍了一下metric的相关知识 : 

ganglia gmond实际上是将metric collection模块化来处理的, 包括自带的metric, 也是模块化来加载的, 所以非常适合扩展.

例如 : 

[root@db-172-16-3-221 cpu]# cd /opt/ganglia-core-3.6.0/[root@db-172-16-3-221 ganglia-core-3.6.0]# lltotal 24drwxr-xr-x 2 root root 4096 Sep  9 11:03 bindrwxr-xr-x 3 root root 4096 Sep 15 09:31 etcdrwxr-xr-x 2 root root 4096 Sep  9 11:03 includedrwxr-xr-x 3 root root 4096 Sep  9 11:03 lib64drwxr-xr-x 2 root root 4096 Sep  9 11:03 sbindrwxr-xr-x 3 root root 4096 Sep  9 11:03 share[root@db-172-16-3-221 ganglia-core-3.6.0]# cd lib64/[root@db-172-16-3-221 lib64]# lltotal 660drwxr-xr-x 2 root root   4096 Sep  9 11:03 ganglialrwxrwxrwx 1 root root     25 Sep  9 11:03 libganglia-3.6.0.so.0 -> libganglia-3.6.0.so.0.0.0-rwxr-xr-x 1 root root 257554 Sep  9 11:03 libganglia-3.6.0.so.0.0.0-rw-r--r-- 1 root root 408276 Sep  9 11:03 libganglia.a-rwxr-xr-x 1 root root   1270 Sep  9 11:03 libganglia.lalrwxrwxrwx 1 root root     25 Sep  9 11:03 libganglia.so -> libganglia-3.6.0.so.0.0.0[root@db-172-16-3-221 lib64]# cd ganglia/[root@db-172-16-3-221 ganglia]# lltotal 700-rwxr-xr-x 1 root root 86896 Sep  9 11:03 modcpu.so-rwxr-xr-x 1 root root 84118 Sep  9 11:03 moddisk.so-rwxr-xr-x 1 root root 17896 Sep  9 11:03 modgstatus.so-rwxr-xr-x 1 root root 84078 Sep  9 11:03 modload.so-rwxr-xr-x 1 root root 85832 Sep  9 11:03 modmem.so-rwxr-xr-x 1 root root 31655 Sep  9 11:03 modmulticpu.so-rwxr-xr-x 1 root root 84480 Sep  9 11:03 modnet.so-rwxr-xr-x 1 root root 83862 Sep  9 11:03 modproc.so-rwxr-xr-x 1 root root 53954 Sep  9 11:03 modpython.so-rwxr-xr-x 1 root root 85136 Sep  9 11:03 modsys.so

在gmond的配置文件中加载模块 : 

# less /opt/ganglia-core-3.6.0/etc/gmond.conf/* Each metrics module that is referenced by gmond must be specified and   loaded. If the module has been statically linked with gmond, it does   not require a load path. However all dynamically loadable modules must   include a load path. */modules {  module {    name = "core_metrics"  }  module {    name = "cpu_module"    path = "modcpu.so"  }  module {    name = "disk_module"    path = "moddisk.so"  }  module {    name = "load_module"    path = "modload.so"  }  module {    name = "mem_module"    path = "modmem.so"  }  module {    name = "net_module"    path = "modnet.so"  }  module {    name = "proc_module"    path = "modproc.so"  }  module {    name = "sys_module"    path = "modsys.so"  }}

[root@db-172-16-3-221 ganglia-3.6.0]# gmetric --helpgmetric 3.6.0The Ganglia Metric Client (gmetric) announces a metricon the list of defined send channels defined in a configuration fileUsage: gmetric [OPTIONS]...  -h, --help            Print help and exit  -V, --version         Print version and exit  -c, --conf=STRING     The configuration file to use for finding send channels                            (default=`/opt/ganglia-core-3.6.0/etc/gmond.conf')  -n, --name=STRING     Name of the metric  -v, --value=STRING    Value of the metric  -t, --type=STRING     Either                           string|int8|uint8|int16|uint16|int32|uint32|float|double  -u, --units=STRING    Unit of measure for the value e.g. Kilobytes, Celcius                            (default=`')  -s, --slope=STRING    Either zero|positive|negative|both  (default=`both')  -x, --tmax=INT        The maximum time in seconds between gmetric calls                            (default=`60')  -d, --dmax=INT        The lifetime in seconds of this metric  (default=`0')  -g, --group=STRING    Group(s) of the metric (comma-separated)  -C, --cluster=STRING  Cluster of the metric  -D, --desc=STRING     Description of the metric  -T, --title=STRING    Title of the metric  -S, --spoof=STRING    IP address and name of host/device (colon separated) we                           are spoofing  (default=`')  -H, --heartbeat       spoof a heartbeat message (use with spoof option)

[root@db-172-16-3-221 ganglia-3.6.0]# ps -ewf|grep gmondnobody    4271     1  0 15:51 ?        00:00:00 gmondroot      4930 26259  0 16:54 pts/2    00:00:00 grep gmond[root@db-172-16-3-221 ganglia-3.6.0]# netstat -anp|grep gmontcp        0      0 0.0.0.0:8649                0.0.0.0:*                   LISTEN      4271/gmond          udp        0      0 172.16.3.221:63894          239.2.11.71:8649            ESTABLISHED 4271/gmond          udp        0      0 239.2.11.71:8649            0.0.0.0:*                               4271/gmond

[root@150 etc]# vi /opt/ganglia-core-3.6.0/etc/gmond.conf/* This configuration is as close to 2.5.x default behavior as possible   The values closely match ./gmond/metric.h definitions in 2.5.x */globals {  daemonize = yes  setuid = yes  user = nobody  debug_level = 0  max_udp_msg_len = 1472  mute = no  deaf = no  allow_extra_data = yes  host_dmax = 86400 /*secs. Expires (removes from web interface) hosts in 1 day */  host_tmax = 20 /*secs */  cleanup_threshold = 300 /*secs */  gexec = no  # By default gmond will use reverse DNS resolution when displaying your hostname  # Uncommeting following value will override that value.  # override_hostname = "mywebserver.domain.com"  # If you are not using multicast this value should be set to something other than 0.  # Otherwise if you restart aggregator gmond you will get empty graphs. 60 seconds is reasonable  send_metadata_interval = 0 /*secs */}/* * The cluster attributes specified will be used as part of the 
     
       * tag that will wrap all hosts collected by this instance. */cluster {  name = "test"  owner = "digoal"  latlong = "111 122"  url = "http://dba.sky-mobi.com"}/* The host section describes attributes of the host, like the location */host {  location = "1,2,4"}/* 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  port = 8649  ttl = 10}
     

主机名和IP如下 : 

[root@150 etc]# hostname150.sky-mobi.com[root@150 etc]# ifconfigem1       Link encap:Ethernet  HWaddr 00:22:19:60:77:8F            inet6 addr: fe80::222:19ff:fe60:778f/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          RX packets:599238829 errors:0 dropped:0 overruns:0 frame:0          TX packets:67014382 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:1000           RX bytes:882536084904 (821.9 GiB)  TX bytes:8841108757 (8.2 GiB)lo        Link encap:Local Loopback            inet addr:127.0.0.1  Mask:255.0.0.0          inet6 addr: ::1/128 Scope:Host          UP LOOPBACK RUNNING  MTU:16436  Metric:1          RX packets:81579301 errors:0 dropped:0 overruns:0 frame:0          TX packets:81579301 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:0           RX bytes:15164677095 (14.1 GiB)  TX bytes:15164677095 (14.1 GiB)ovirtmgmt Link encap:Ethernet  HWaddr 00:22:19:60:77:8F            inet addr:172.16.3.150  Bcast:172.16.3.255  Mask:255.255.255.0          inet6 addr: fe80::222:19ff:fe60:778f/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          RX packets:93718326 errors:0 dropped:0 overruns:0 frame:0          TX packets:86213477 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:0           RX bytes:1098952054073 (1023.4 GiB)  TX bytes:11330242206 (10.5 GiB)ovirtmgmt:1 Link encap:Ethernet  HWaddr 00:22:19:60:77:8F            inet addr:172.16.13.150  Bcast:172.16.13.255  Mask:255.255.255.0          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

首先要启动gmond, (当然, 不启动也可以, 启动gmond除了可以发心跳包, 还可以将location等基础信息发过去)

Usage: gmetric [OPTIONS]...  -h, --help            Print help and exit  -V, --version         Print version and exit  -c, --conf=STRING     The configuration file to use for finding send channels                            (default=`/opt/ganglia-core-3.6.0/etc/gmond.conf')  -n, --name=STRING     Name of the metric  -v, --value=STRING    Value of the metric  -t, --type=STRING     Either                           string|int8|uint8|int16|uint16|int32|uint32|float|double  -u, --units=STRING    Unit of measure for the value e.g. Kilobytes, Celcius                            (default=`')  -s, --slope=STRING    Either zero|positive|negative|both  (default=`both')  -x, --tmax=INT        The maximum time in seconds between gmetric calls                            (default=`60')  -d, --dmax=INT        The lifetime in seconds of this metric  (default=`0')  -g, --group=STRING    Group(s) of the metric (comma-separated)  -C, --cluster=STRING  Cluster of the metric  -D, --desc=STRING     Description of the metric  -T, --title=STRING    Title of the metric  -S, --spoof=STRING    IP address and name of host/device (colon separated) we                           are spoofing  (default=`')  -H, --heartbeat       spoof a heartbeat message (use with spoof option)[root@150 etc]# gmetric -c /opt/ganglia-core-3.6.0/etc/gmond.conf -n load_one -v 1.0 -t float -s both -x 20 -g load -C test -D "load per min" -T "load one"

例如在172.16.3.150模拟发送172.16.3.151的metric信息 : 

[root@150 etc]# gmetric -c /opt/ganglia-core-3.6.0/etc/gmond.conf -n load_one -v 1.0 -t float -s both -x 20 -g load -C test -D "load per min" -T "load one" -S "172.16.3.151:digoal_host"

[root@150 etc]# gmetric -c /opt/ganglia-core-3.6.0/etc/gmond.conf -n load_one -v 1.0 -t float -s both -x 20 -g load -C test -D "load per min" -T "load one" -S "172.16.3.151:digoal_host" -H

[root@db-172-16-3-221 kernel-doc-2.6.32]# netstat -anp|grep gmondtcp        0      0 0.0.0.0:8649                0.0.0.0:*                   LISTEN      4271/gmond          udp        0      0 172.16.3.221:63894          239.2.11.71:8649            ESTABLISHED 4271/gmond          udp        0      0 239.2.11.71:8649            0.0.0.0:*                               4271/gmond

[参考]