【Python运维脚本】Python监控内存(swap)的使用率

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2.7
#Author: [email protected]
#Python监控内存(swap)的使用率
'''
1、实现原理：通过SNMP协议获取系统信息，再进行相应的计算和格式化，最后输出结果
2、特别注意：被监控的机器上需要支持snmp。yum install -y net-snmp*安装
'''
#!/usr/bin/python
import os
def getAllitems(host, oid):
        sn1 = os.popen('snmpwalk -v 2c -c public ' + host + ' ' + oid).read().split('\n')[:-1]
        return sn1
                                                                            
def getSwapTotal(host):
        swap_total = getAllitems(host, 'UCD-SNMP-MIB::memTotalSwap.0')[0].split(' ')[3]
        return swap_total
                                                                            
def getSwapUsed(host):
        swap_avail = getAllitems(host, 'UCD-SNMP-MIB::memAvailSwap.0')[0].split(' ')[3]
        swap_total = getSwapTotal(host)
        swap_used = str(round(((float(swap_total)-float(swap_avail))/float(swap_total))*100 ,2)) + '%'
        return swap_used
                                                                            
def getMemTotal(host):
        mem_total = getAllitems(host, 'UCD-SNMP-MIB::memTotalReal.0')[0].split(' ')[3]
        return mem_total
                                                                            
def getMemUsed(host):
        mem_total = getMemTotal(host)
        mem_avail = getAllitems(host, 'UCD-SNMP-MIB::memAvailReal.0')[0].split(' ')[3]
        mem_used = str(round(((float(mem_total)-float(mem_avail))/float(mem_total))*100 ,2)) + '%'
        return mem_used
                                                                            
if __name__ == '__main__':
        hosts = ['192.168.10.1','192.168.10.2']
        print "Monitoring Memory Usage"
        for host in hosts:
                mem_used = getMemUsed(host)
                swap_used = getSwapUsed(host)
                print '==========' + host + '=========='
                print 'Mem_Used = %-15s   Swap_Used = %-15s' % (mem_used, swap_used)
                print