Hunter的大杂烩 技术学习笔记

1. 用了自带的python client

优点是可以比较精细获取某个指标 ，比如我用这个来判断没有外网IP的机器是否存活：

#!/bin/sh

if [ $# -lt 1 ];then
echo “USAGE: $0 [host]”
exit
fi

retmsg=`/opt/ganglia/bin/ganglia –host=${gmond_ip} –port=${gmond_port}  –alive=$1 |grep True`
if [ -z $retmsg ];
then
echo “CRITICAL: host:” $1 ” is dead!”
exit 2
else
echo “OK:host:” $1 ” is alive”
exit 0
fi
2. 用了ganglia-nagios-bridge

优点是可以批量获取、设置多个指标

1. ganglia python client运行错误

error msg:’cannot connect to ganglia server (gmond) [xxx:yyy]

modify:  vi /opt/ganglia/lib/python/gmon/ganglia.py +412

sock.connect((self.svchost, int(self.svcport)))

^^^^^^^^^

2. nagios 监控出现It appears as though you do not have permission

参考：http://bbs.linuxtone.org/thread-4440-1-1.html

有可能是你的htpasswd里面的用户名不是nagiosadmin，修改 cgi.cfg中相关配置即可

3. contact notification_options里面去掉 u 参数（unkown)

如： service_notification_options    w,c,r,f,s

因为ganglia的python插件会用unkown状态

url：https://github.com/ganglia/monitor-core/wiki/Integrating-Ganglia-with-Nagios

其中 ganglia-nagios-bridge 需要安装 argparse 模块:

easy_install argparse

check_ganglia_metric 需要 安装NagAconda 模块 或者直接执行 easy_install ceck_ganglia_metric

btw：怎么都没搞定这个check_ganglia_metric的cache问题，回头继续搞 ganglia python client

如果在配置gmond.conf时，没有使用多播，那么必须把自己的ip加入到send_channel里面，否则 gmond不会感知本机的数据！

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 = 192.168.1.1

port = 28649
ttl = 1
}

主要是selinux搞的鬼，大致需要调整以下配置：
1. chcon -t httpd_sys_content_t -R /usr/local/ganglia/ganglia-web
chown apache:apache -R /usr/local/ganglia/ganglia-web
chmod 777 /usr/local/ganglia/ganglia-web/dwoo/*

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