Installing SNMP on CentOS: A Detailed Guide to Monitoring Server Performance with Jiankongbao
Translated from Chinese by Claude. Read the original
This morning my VPS was down for 7 hours and I couldn’t figure out why, so I decided I’d just use Jiankongbao for monitoring~ It saves some trouble. Hence the following…… First, install snmp
1 | yum install -y net-snmp net-snmp-utils |
Then configure snmp. Step one: (with a yum install the config file is /etc/snmp/snmpd.conf. It’s full of stuff, a very detailed document, but I always find an excuse not to read it carefully. So move it out of the way first, then create your own snmpd.conf)
1 | mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.bak |
Enter “rouser jiankongbao auth”, then save and quit. (This is v3c authentication, adding a read-only account as follows: rouser jiankongbao auth. What that line means: in v3c, “rouser” indicates a read-only account type, the following “jiankongbao” is the chosen username, and the “auth” after it says authentication is required.) Step two: we need to create the user jiankongbao. For that we need the file /var/net-snmp/snmpd.conf, which is loaded automatically when snmpd starts. Since we haven’t run snmp yet, create the file by hand with these commands:
1 | mkdir /var/net-snmp |
Enter the following text
1 | createUser jiankongbao MD5 mypassword |
(This line creates a user named “jiankongbao” with the password “mypassword”, using MD5 for encrypted transmission. One reminder: the password must be at least 8 bytes long. That’s required by the SNMP protocol; if it’s shorter than 8 bytes, communication won’t work.) Finally, start snmp
1 | service snmpd start |
Set it to start automatically at boot
1 | chkconfig snmpd on |
Now you can add server monitoring in the Jiankongbao dashboard. For the detailed Jiankongbao settings, see Jiankongbao’s blog post Enabling a Secure SNMP Agent on a Linux Server
PS: 
Lu Xun. It took the Party 60 years to figure out who Lu Xun was cursing, and just a few months to erase him from the textbooks. A nation short on national heroes is a sad thing indeed. A few fewer radicals, a few fewer leftists, a few fewer angry young men, a few fewer…… does that make the country safe? Ridiculous! Sad. I can’t go into politics. I’d like to, but once I sat in that seat, maybe I’d end up just like him. Anyone could fill that seat! There’s a whole crowd underneath helping him out! The PS above is purely for fun!