Lightweight VPS Monitoring Tool
I have purchased several VPS instances. Is there any good lightweight tool to monitor them?
Currently the way I check is to ssh to each of them and use command "uptime" to see if servers didn't fail/restarted and still in good shape (not using too much resource). I don't know the exact word/term to call the tool I'm looking for. Please enlighten me.
So basically I need a tool that:
can monitor basic stats of VPS instances (more than one VPS) like free memory, CPU load, uptime, issues, etc.
web-based so I can view it on mobile phone.
lightweight, non CPU/memory intensive. (* important because I'm using low plans)
easy setup and fewer package dependency is a plus.
nice interface is a plus.
PS: All my VPS are Ubuntu.