As I have started to work on the Ethereum platform, one of my first needs as a system administrator the monitoring of the health of my node. There are many projects that allow you the monitoring, one of them is the which it is very cool. In it you can see your general node health, but to be honest, it is quite a hassle to have the web page on, not to mention you need to install some nodejs application in your server. 

Because of this, I decided to write my own Ethereum Nagios Plugins. As I have already a Nagios deployment that monitors no less than 40 servers, it is a good idea sending an alert if something is going wrong.

The initial release of this plugins will help any system administrator to know the following:

  • Detection when the local blockchain is getting out of sync, by default (if you don't specify anything else) it will send you a CRITICAL signal if sync is behind 10 blocks, and a WARNING signal if it is behind 5 blocks.
  • Detection when the mining hash rate speed is slowing or mining activity has stopped at all, if you have one full node and many workers, usually you have a stable Hashing speed, when some workers start going down your speed will decrease and you will get an alert if this is happening.
  • Detection when you are not connected to enough peers, by default (if you don't specify anything else) it will send you a CRITICAL signal if you are connected to 5 or fewer peers in the network, and a WARNING signal if you are connected to 10 or less. The go-ethereum and the cpp-ethereum projects use 25 peers as a default value.

I will write later a guide to show you all how to implement the plugins. It is quite easy.

Good Luck!

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