snmp on Raspberry PI

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I want to use snmp for administrating my raspberry PI, for example, its disk usage, cpu usage, and etc. following is the how-to of setting up the monitoring environment.
###Preparation

	$ apt-get upate && apt-get upgrade
	$ apt-get install apache2 php5 mysql-client mysql-server
You will be prompted to set a password for mysql root user.
	$ apt-get install php5-mysql php5-snmp rrdtool snmp snmpd