Install snmpd
# yum -y install net-snmp net-snmp-devel
步驟
1.
2.
Install iftop / sysstat / mrtg
# yum -y install iftop sysstat mrtg
3.
Setup MRTG
a. Setup SNMP
#mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.bak #vi /etc/snmp/snmpd.conf
# First, map the community name (COMMUNITY) into a security name # (local and mynetwork, depending on where the request is coming # from): # sec.name source community com2sec notConfigUser default public #### # Second, map the security names into group names: # sec.model sec.name group notConfigGroup v1 notConfigUser group notConfigGroup v2c notConfigUser #### # Third, create a view for us to let the groups have rights to: # incl/excl subtree mask view all included .1 80 #### # Finally, grant the 2 groups access to the 1 view with different # write permissions: # context sec.model sec.level match read write notif access notConfigGroup "" any noauth exact all none none
b. Setup SYSSTAT
# mkdir /opt/mrtg
i. CPU
# vi /opt/mrtg/mrtg.cpu
#!/bin/bash
cpuusr=`/usr/bin/sar -u 1 3 | grep Average | awk '{print $3}'`
cpusys=`/usr/bin/sar -u 1 3 | grep Average | awk '{print $5}'`
UPtime=`/usr/bin/uptime | awk '{print $3.$4.$5}'`
echo $cpuusr
echo $cpusys
echo $UPtime
hostname
# chmod 755 /opt/mrtg/mrtg.cpu
ii. MEM
# vi /opt/mrtg/mrtg.mem
# vi /opt/mrtg/mrtg.mem
#!/bin/bash
echo `/usr/bin/free -m | grep Mem | awk '{print $3}'`
echo `/usr/bin/free -m | grep Swap | awk '{print $3}'`
echo `/usr/bin/uptime | awk '{print $3 " " $4 " " $5}'`
hostname
# chmod 755 /opt/mrtg/mrtg.mem
iii. DISK Usage
# vi /opt/mrtg/df.sh
# vi /opt/mrtg/df.sh
#!/bin/bash
hd=/mnt/hda
total=`df -k |grep $hd |awk '{print $1}'`
usage=`df -k |grep $hd |awk '{print $2}'`
echo "$total";
echo "$usage";
hostname
echo `/usr/bin/uptime | awk '{print $3 " " $4 " " $5}'`
iv. DISK Performance
# vi /opt/mrtg/diskperf.sh
#!/bin/sh
hd=sda
IOSTAT=$(iostat -d $hd 1 4 | awk '{print $3 " " $4}' | grep '[0-9]*\.[0-9]*')
echo "$IOSTAT" | cut -d ' ' -f 1 | xargs | awk '{printf "%12d\n",($2+$3+$4)/3*512}'
echo "$IOSTAT" | cut -d ' ' -f 2 | xargs | awk '{printf "%12d\n",($2+$3+$4)/3*512}'
c. Setup MRTG
# vi /etc/mrtg/mrtg.cfg
HtmlDir: /var/www/mrtg ImageDir: /var/www/mrtg LogDir: /var/lib/mrtg ThreshDir: /var/lib/mrtg Target[eth0]: 2:public@127.0.0.1 MaxBytes[eth0]: 12500000 Title[eth0]: Traffic Analysis PageTop[eth0]: <H1>127.0.0.1 eth0</H1> Target[cpu]: `/opt/mrtg/mrtg.cpu` MaxBytes[cpu]: 100 Options[cpu]: gauge, nopercent YLegend[cpu]: CPU loading (%) ShortLegend[cpu]: % LegendO[cpu]: CPU us; LegendI[cpu]: CPU sy; Title[cpu]: CPU Loading PageTop[cpu]:<H1>CPU Loading</H1> Target[mem]: `/opt/mrtg/mrtg.mem` MaxBytes[mem]: 2048000 kmg[mem]: KB kilo[mem]: 1024 Options[mem]: gauge,nopercent YLegend[mem]: Memory Usage: Legend1[mem]: Total Memory: Legend2[mem]: Used Memory: LegendI[mem]: Total Memory: LegendO[mem]: Used Memory: Title[mem]: MEMORYWORKLOAD PageTop[mem]:<H1>Memory</H1> Target[disk]: `/opt/mrtg/df.sh` Title[disk]: Disk Space Unscaled[disk]: dwym MaxBytes[disk]: 524288000 kmg[disk]: KB,MB,GB LegendI[disk]: Total Disk Space LegendO[disk]: Used Disk Space Legend1[disk]: Total Disk Space Legend2[disk]: Used Disk Space YLegend[disk]: Megabytes ShortLegend[disk]: & Options[disk]: gauge,nopercent PageTop[disk]: <h1>Disk Space</h1> Target[diskIO]: `/opt/mrtg/diskperf.sh` Title[diskIO]: Disk I/O Utilization Report MaxBytes[diskIO]: 62914560 PageTop[diskIO]: <h1>Disk I/O Utilization Report</h1> kmg[diskIO]: B,KB,MB LegendI[diskIO]: Disk I/O KBread/sec LegendO[diskIO]: Disk I/O KBwrite/sec Legend1[diskIO]: Disk I/O KBread/sec Legend2[diskIO]: Disk I/O KBwrite/sec YLegend[diskIO]: Kbytes ShortLegend[diskIO]: & Options[diskIO]: gauge,nopercent
# mkdir /var/lib/mrtg # env LANG=C mrtg /etc/mrtg/mrtg.cfg # env LANG=C mrtg /etc/mrtg/mrtg.cfg # env LANG=C mrtg /etc/mrtg/mrtg.cfg # indexmaker /etc/mrtg/mrtg.cfg > /var/www/mrtg/index.html
# vi /etc/httpd/conf.d/mrtg.conf
Alias /mrtg /var/www/mrtg
<Location /mrtg>
Order deny,allow
allow from all
</Location>
4.
設定排程
透過 crontab -e 加上以下指令
*/5 * * * * env LANG=C mrtg /etc/mrtg/mrtg.cfg --logging /var/log/mrtg.log
5.
Optimizate TCP/IP configuration
# vi /etc/sysctl.conf # 加上以下的設定 (要注意已經有的則調整參數即可)
# Use TCP syncookies when needed net.ipv4.tcp_synack_retries=3 net.ipv4.tcp_syn_retries=3 net.ipv4.tcp_max_syn_backlog=2048 # Enable TCP window scaling net.ipv4.tcp_window_scaling = 1 # Increase TCP max buffer size net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 # Increase Linux autotuning TCP buffer limits net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 # Increase number of ports available net.ipv4.tcp_fin_timeout = 30 net.ipv4.tcp_keepalive_time = 300 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.ip_local_port_range = 5000 65000
最後執行
sysctl -p
即可無須重開機便啟用此設定
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