1. Nagios监视远程服务器时，是通过在控制端执行以下命令进行数据收集的：
/usr/local/nagios/libexec/check_http -I 192.168.16.11
/usr/local/nagios/libexec/check_ssh -H 192.168.16.11
/usr/local/nagios/libexec/check_ping -H 192.168.16.11 -w 100.0,20% -c 500.0,60% -p 5
/usr/local/nagios/libexec/check_tcp -H 192.168.16.11 -p 22
/usr/local/nagios/libexec/check_snmp_load.pl -H 192.168.16.11 -C public -w 70% -c 90% -T netsc -f
/usr/local/nagios/libexec/check_traffic.sh -V 2c -C public -H 192.168.16.11 -I 0 -w 400,200 -c 600,400 -M -b
/usr/local/nagios/libexec/check_snmp_storage.pl -H 192.168.16.11 -C public -m "^/" -w 80% -c 90% -f
/usr/local/nagios/libexec/check_snmp_storage.pl -H 192.168.16.11 -C public -m "memory|Memory" -w 80% -c 90% -f
/usr/local/nagios/libexec/check_snmp -H '192.168.16.11' -C public -o .1.3.6.1.4.1.2021.11.9.0,.1.3.6.1.4.1.2021.11.10.0,.1.3.6.1.4.1.2021.11.11.0 -l 'CPU usage (user system idle)' -u '%'
/usr/local/nagios/libexec/check_snmp_load.pl -H 192.168.16.11 -C public -w 3,3,2 -c 4,4,3 -T netsl -f
2. 测试方法：
1）通过nagios运行时，监视收集远程服务器资源使用信息；
2）通过在控制端每s执行监控命令，监视收集远程服务器资源使用信息；
3. 测试结果：
方法一：nagios运行时，在远程服务器分别执行top -b -d 2 -p21472 >/tmp/top_snmp.log、top -b -d 2 >/tmp/top_all.log，执行时间约为3小时，分析收集到的日志得知，监视时系统资源使用情况正常。
top_snmp.log部分信息
top - 15:17:25 up 192 days, 22:16, 4 users, load average: 0.00, 0.00, 0.00
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32933092k total, 21012132k used, 11920960k free, 520748k buffers
Swap: 16779884k total, 0k used, 16779884k free, 16376668k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21472 root 15 0 157m 8616 4424 S 0.0 0.0 0:12.07 snmpd top_all.log部分信息
top - 09:51:22 up 192 days, 16:50, 5 users, load average: 0.00, 0.00, 0.00
Tasks: 258 total, 1 running, 257 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2%us, 0.1%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32933092k total, 20603272k used, 12329820k free, 520164k buffers
Swap: 16779884k total, 0k used, 16779884k free, 15974748k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 15 0 10372 692 584 S 0.0 0.0 0:02.33 init
2 root RT -5 0 0 0 S 0.0 0.0 0:00.23 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0 方法二：在控制端执行脚本plugins_test.sh，执行命令为：watch –d –n 1 sh plugins_test.sh，同时在远程服务器上执行top -b -d 1 -p21472 >top_snmp_time.log、watch -d -n 1 vmstatg、watch -d -n 1 free -m，5min后查看日志，分析收集到的日志得知，监视时系统资源使用情况正常。
Free命令10s之间的变化数
total used free shared buffers cached
Mem: 32161 20527 11633 0 508 15983
-/+ buffers/cache: 4035 28125
Swap: 16386 0 16386 total used free shared buffers cached
Mem: 32161 20528 11632 0 508 15983
-/+ buffers/cache: 4035 28125
Swap: 16386 0 16386 vmstat命令10s之间的变化数
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 0 11912152 520788 16367288 0 0 0 3 0 0 0 0 100 0 0 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 0 11912484 520788 16367332 0 0 0 3 0 0 0 0 100 0 0
top_snmp_time.log部分信息
top - 16:22:15 up 192 days, 23:21, 9 users, load average: 0.00, 0.00, 0.00
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32933092k total, 21018792k used, 11914300k free, 520780k buffers
Swap: 16779884k total, 0k used, 16779884k free, 16374824k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21472 root 15 0 157m 8616 4424 S 0.0 0.0 0:13.08 snmpd top - 16:22:16 up 192 days, 23:21, 9 users, load average: 0.00, 0.00, 0.00
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32933092k total, 21018792k used, 11914300k free, 520780k buffers
Swap: 16779884k total, 0k used, 16779884k free, 16374824k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21472 root 15 0 157m 8616 4424 S 0.0 0.0 0:13.08 snmpd top - 16:22:17 up 192 days, 23:21, 9 users, load average: 0.00, 0.00, 0.00
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32933092k total, 21018680k used, 11914412k free, 520780k buffers
Swap: 16779884k total, 0k used, 16779884k free, 16374824k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21472 root 15 0 157m 8616 4424 S 0.0 0.0 0:13.08 snmpd
4. 测试结果：
通过以上数据分析后可知：在利用nagios的自身插件及snmp协议（共对远程服务器的10个服务时行监控）监控远程服务器时，对远程服务器资源使用情况无影响。当大于10个服务时，需要另行评测。
5. 远程服务器配置情况：
[root@xxx-xxx ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c &cat /proc/cpuinfo | grep physical | uniq -c
[1] 13558
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 1
1 address sizes : 40 bits physical, 48 bits virtual
16 Intel(R) Xeon(R) CPU E5620 @ 2.40GHz [root@xxx-xxx ~]# cat /etc/issue&free -g
[1] 13753
CentOS release 5.6 (Final)
Kernel \r on an \m total used free shared buffers cached
Mem: 31 20 11 0 0 15
-/+ buffers/cache: 3 27
Swap: 16 0 16
[1]+ Done cat /etc/issue