I just learned python, and I wrote a few scripts to monitor the performance of the system by myself. The principle is relatively simple. They all obtain system information through the SNMP protocol, then perform corresponding calculations and formatting, and finally output the results.
The following scripts are all MIB information obtained by calling the snmpwalk command through the os.popen module. I originally wanted to use py-snmp, but because there are too few online resources, and the examples on the official website are not easy to understand, this method can only be used instead. . Later try to use py-snmp to do these things. Since these scripts call the snmpwalk command to obtain information, the monitored machine needs to support snmp and can execute
# yum install -y net-snmp*
The following is the code of several scripts. It was written for the first time, and the writing was not standardized and concise enough. Please give me more advice.
Monitor network card traffic
#!/usr/bin/python
import re
import os
#get SNMP-MIB2 of the devices
def getAllitems(host,oid):
sn1 = os.popen('snmpwalk -v 2c -c public ' + host + ' ' + oid).read().split('\n')[:-1]
return sn1
#get network device
def getDevices(host):
device_mib = getAllitems(host,'RFC1213-MIB::ifDescr')
device_list = []
for item in device_mib:
if re.search('eth',item):
device_list.append(item.split(':')[3].strip())
return device_list
#get network date
def getDate(host,oid):
date_mib = getAllitems(host,oid)[1:]
date = []
for item in date_mib:
byte = float(item.split(':')[3].strip())
date.append(str(round(byte/1024,2)) + ' KB')
return date
if __name__ == '__main__':
hosts = ['192.168.30.111','192.168.30.112']
for host in hosts:
device_list = getDevices(host)
inside = getDate(host,'IF-MIB::ifInOctets')
outside = getDate(host,'IF-MIB::ifOutOctets')
print '==========' + host + '=========='
for i in range(len(inside)):
print '%s : RX: %-15s TX: %s ' % (device_list[i], inside[i], outside[i])
printMonitor memory (swap) usage
#!/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 = ['192.168.30.111','192.168.30.112']
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)
printMonitor system load
#!/usr/bin/python
import os
def getAllitems(host, oid):
sn1 = os.popen('snmpwalk -v 2c -c public ' + host + ' ' + oid).read().split('\n')
return sn1
def getload(host,loid):
load_oids = '1.3.6.1.4.1.2021.10.1.3.' + str(loid)
return getAllitems(host,load_oids)[0].split(':')[3]
if __name__ == '__main__':
hosts = ['192.168.30.111','192.168.30.112']
#check_system_load
print '==============System Load=============='
for host in hosts:
load1 = getload(host, 1)
load10 = getload(host, 2)
load15 = getload(host, 3)
print '%s load(1min): %s ,load(10min): %s ,load(15min): %s' % (host,load1,load10,load15)Monitor CPU
#!/usr/bin/python
import os
def getAllitems(host, oid):
sn1 = os.popen('snmpwalk -v 2c -c public ' + host + ' ' + oid + '|grep Raw|grep Cpu|grep -v Kernel').read().split('\n')[:-1]
return sn1
def getDate(host):
items = getAllitems(host, '.1.3.6.1.4.1.2021.11')
date = []
rate = []
cpu_total = 0
#us = us+ni, sy = sy + irq + sirq
for item in items:
float_item = float(item.split(' ')[3])
cpu_total += float_item
if item == items[0]:
date.append(float(item.split(' ')[3]) + float(items[1].split(' ')[3]))
elif item == item[2]:
date.append(float(item.split(' ')[3] + items[5].split(' ')[3] + items[6].split(' ')[3]))
else:
date.append(float_item)
#calculate cpu usage percentage
for item in date:
rate.append((item/cpu_total)*100)
mean = ['%us','%ni','%sy','%id','%wa','%cpu_irq','%cpu_sIRQ']
#calculate cpu usage percentage
result = map(None,rate,mean)
return result
if __name__ == '__main__':
hosts = ['192.168.30.111','192.168.30.112']
for host in hosts:
print '==========' + host + '=========='
result = getDate(host)
print 'Cpu(s)',
#print result
for i in range(5):
print ' %.2f%s' % (result[i][0],result[i][1]),
print
printmonitor disk
#!/usr/bin/python
import re
import os
def getAllitems(host,oid):
sn1 = os.popen('snmpwalk -v 2c -c public ' + host + ' ' + oid).read().split('\n')[:-1]
return sn1
def getDate(source,newitem):
for item in source[5:]:
newitem.append(item.split(':')[3].strip())
return newitem
def getRealDate(item1,item2,listname):
for i in range(len(item1)):
listname.append(int(item1[i])*int(item2[i])/1024)
return listname
def caculateDiskUsedRate(host):
hrStorageDescr = getAllitems(host, 'HOST-RESOURCES-MIB::hrStorageDescr')
hrStorageUsed = getAllitems(host, 'HOST-RESOURCES-MIB::hrStorageUsed')
hrStorageSize = getAllitems(host, 'HOST-RESOURCES-MIB::hrStorageSize')
hrStorageAllocationUnits = getAllitems(host, 'HOST-RESOURCES-MIB::hrStorageAllocationUnits')
disk_list = []
hrsused = []
hrsize = []
hrsaunits = []
#get disk_list
for item in hrStorageDescr:
if re.search('/',item):
disk_list.append(item.split(':')[3])
#print disk_list
getDate(hrStorageUsed,hrsused)
getDate(hrStorageSize,hrsize)
#print getDate(hrStorageAllocationUnits,hrsaunits)
#get hrstorageAllocationUnits
for item in hrStorageAllocationUnits[5:]:
hrsaunits.append(item.split(':')[3].strip().split(' ')[0])
#caculate the result
#disk_used = hrStorageUsed * hrStorageAllocationUnits /1024 (KB)
disk_used = []
total_size = []
disk_used = getRealDate(hrsused,hrsaunits,disk_used)
total_size = getRealDate(hrsize,hrsaunits,total_size)
diskused_rate = []
for i in range(len(disk_used)):
diskused_rate.append(str(round((float(disk_used[i])/float(total_size[i])*100), 2)) + '%')
return diskused_rate,disk_list
if __name__ == '__main__':
hosts = ['192.168.30.111','192.168.30.112']
for host in hosts:
result = caculateDiskUsedRate(host)
diskused_rate = result[0]
partition = result[1]
print "==========",host,'=========='
for i in range(len(diskused_rate)):
print '%-20s used: %s' % (partition[i],diskused_rate[i])
printResults of the
