MRTG监控 ON RHEL6

# rpm -qa | grep snmp

# yum install net-snmp-utils net-snmp

Run ''ps'' command to see if snmp server is running or not:

# ps -aux | grep snmp

Output:

root   5512  0.0  2.3  5872 3012 pts/0    S    22:04   0:00 /usr/sbin/snmpd

Alternatively, you can try any of the following two commands as well:

# lsof -i :199

Output:

COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME

snmpd   5512 root    4u  IPv4  34432       TCP *:smux (LISTEN)

OR try out netstat command:

# netstat -natv | grep '':199''

Output:

tcp        0      0 0.0.0.0:199             0.0.0.0:*               LISTEN

If you found service is running or listing on port 199 then please see step #3; otherwise start service using following command:

# service snmpd start

Make sure snmpd service starts automatically, when linux comes us (add snmpd service):

# chkconfig --add snmpd

Run snmpwalk utility to request for tree of information about network entity. In simple words query snmp server for your IP address (assigned to eth0, eth1, lo etc):

# snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex

ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex.127.0.0.1 = 1

ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex.192.168.0.3 = 2

If you can see your IP address then please proceed to step 4; else it is a time to configure snmp server as follows (by default RHEL and RH 8/9 are not configured for snmp server for security reason):

(1) Edit file /etc/snmp/snmpd.conf using text editor:

# vi /etc/snmp/snmpd.conf

Change/Modify line(s) as follows:

Find following Line:

com2sec notConfigUser  default       public

Replace with (make sure you replace 192.168.0.0/24 replace with your network IPs) following lines:

com2sec local     localhost           public

com2sec mynetwork 192.168.0.0/24      public

Scroll down bit and change:

Find Lines:

group   notConfigGroup v1           notConfigUser

group   notConfigGroup v2c           notConfigUser

Replace with:

group MyRWGroup v1         local

group MyRWGroup v2c        local

group MyRWGroup usm        local

group MyROGroup v1         mynetwork

group MyROGroup v2c        mynetwork

group MyROGroup usm        mynetwork

Again scroll down bit and locate following line:

Find line:

view    systemview     included      system

Replace with:

view all    included  .1                               80

Again scroll down bit and change:

Find line:

access  notConfigGroup ""      any       noauth    exact  systemview none none

Replace with:

access MyROGroup ""      any       noauth    exact  all    none   none

access MyRWGroup ""      any       noauth    exact  all    all    none

Scroll down bit and change:

Find lines:

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