A few days ago, a client’s data center "vanished" overnight.
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@EnigmaRotor reading this at lunch in a cafe near my house and I keep chuckling and smiling from ear to ear. @stefano is such a treasure
@_elena@mastodon.social When you direct the movie, can I star as the legendary @stefano@mastodon.bsd.cafe ?
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@stefano so refreshing to read a quality tech tale on Mastodon. Thanks for sharing!
@bojanlandekic thank you! I'm just trying to spread some real life experiences
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@jamesoff
I have
my backup scripts write their return code in a file.I monitor file content and mtime, get an alert if content not 0 or file too old
I also regularly manually test backup restore.
Then I can sleep
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@stefano This is such a good, if niche, example of "paying attention to the fundamentals and the alerts covers all sorts of things you'd never imagine happening."
Thanks for sharing.
@neurovagrant thank you! My rule is: we need moooarr alerts, as you never know how and when (not if - we know it will happen) your alertil system will break.
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A few days ago, a client’s data center "vanished" overnight. My monitoring showed that all devices were unreachable. Not even the ISP routers responded, so I assumed a sudden connectivity drop. The strange part? Not even via 4G.
I then suspected a power failure, but the UPS should have sent an alert.
The office was closed for the holidays, but I contacted the IT manager anyway. He was home sick with a serious family issue, but he got moving.
To make a long story short: the company deals in gold and precious metals. They have an underground bunker with two-meter thick walls. They were targeted by a professional gang. They used a tactic seen in similar hits: they identify the main power line, tamper with it at night, and send a massive voltage spike through it.
The goal is to fry all alarm and surveillance systems. Even if battery-backed, they rarely survive a surge like that. Thieves count on the fact that during holidays, owners are away and fried systems can't send alerts. Monitoring companies often have reduced staff and might not notice the "silence" immediately.
That is exactly what happened here. But there is a "but": they didn't account for my Uptime Kuma instance monitoring their MikroTik router, installed just weeks ago. Since it is an external check, it flagged the lack of response from all IPs without needing an internal alert to be triggered from the inside.
The team rushed to the site and found the mess. Luckily, they found an emergency electrical crew to bypass the damage and restore the cameras and alarms. They swapped the fried server UPS with a spare and everything came back up.
The police warned that the chances of the crew returning the next night to "finish" the job were high, though seeing the systems back online would likely make them move on. They also warned that thieves sometimes break in just to destroy servers to wipe any video evidence.
Nothing happened in the end. But in the meantime, I had to sync all their data off-site (thankfully they have dual 1Gbps FTTH), set up an emergency cluster, and ensure everything was redundant.
Never rely only on internal monitoring. Never.
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@EnigmaRotor reading this at lunch in a cafe near my house and I keep chuckling and smiling from ear to ear. @stefano is such a treasure
@_elena @EnigmaRotor thank you!
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@_elena@mastodon.social When you direct the movie, can I star as the legendary @stefano@mastodon.bsd.cafe ?
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@_elena@mastodon.social When you direct the movie, can I star as the legendary @stefano@mastodon.bsd.cafe ?
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@randomized @rhoot @stefano how do you monitor your sleep
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@stefano you’re a hero Stefano! As your Fedi friend and documentary filmmaker I hope I get preferential treatment when one of your amazing stories gets optioned for a film
@_elena Thank you! Sure, I will
But, to be honest, I don't think any of those stories will ever be a film.The big, most scary one is yet to come, anyway...
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You are the hero I aspire to be!
Why ?
It's a cool story for everyone that does network supervision, but why take sides there ?
The attackers probably worked more than the company owners for their gold, so why denying it to them would be a good thing ?Even the sysadmin in https://xkcd.com/705/ only did his job, he didn't choose a side.
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@stux thank you! Yes, that's a very wise approach. I have some internal and external monitoring tools. And the monitoring tools monitoring the monitoring tools, with different technologies (so a bug won't hit all the tools at the same time). Yet, I always feel I need moooarrr monitoring
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@stefano But what monitors the monitor monitors? We need an audio technician in here, stat!
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A few days ago, a client’s data center "vanished" overnight. My monitoring showed that all devices were unreachable. Not even the ISP routers responded, so I assumed a sudden connectivity drop. The strange part? Not even via 4G.
I then suspected a power failure, but the UPS should have sent an alert.
The office was closed for the holidays, but I contacted the IT manager anyway. He was home sick with a serious family issue, but he got moving.
To make a long story short: the company deals in gold and precious metals. They have an underground bunker with two-meter thick walls. They were targeted by a professional gang. They used a tactic seen in similar hits: they identify the main power line, tamper with it at night, and send a massive voltage spike through it.
The goal is to fry all alarm and surveillance systems. Even if battery-backed, they rarely survive a surge like that. Thieves count on the fact that during holidays, owners are away and fried systems can't send alerts. Monitoring companies often have reduced staff and might not notice the "silence" immediately.
That is exactly what happened here. But there is a "but": they didn't account for my Uptime Kuma instance monitoring their MikroTik router, installed just weeks ago. Since it is an external check, it flagged the lack of response from all IPs without needing an internal alert to be triggered from the inside.
The team rushed to the site and found the mess. Luckily, they found an emergency electrical crew to bypass the damage and restore the cameras and alarms. They swapped the fried server UPS with a spare and everything came back up.
The police warned that the chances of the crew returning the next night to "finish" the job were high, though seeing the systems back online would likely make them move on. They also warned that thieves sometimes break in just to destroy servers to wipe any video evidence.
Nothing happened in the end. But in the meantime, I had to sync all their data off-site (thankfully they have dual 1Gbps FTTH), set up an emergency cluster, and ensure everything was redundant.
Never rely only on internal monitoring. Never.
@stefano About 15 years ago, the place I worked had a supercomputer. One night, the aircon in the machine room failed. The machine kept computing, and the temperature rose. It rose *quite a lot*.
Sadly, the first thing to fail from the heat was the core switch for the room. You know, the one that handles all of the network for everything in the room. Including the temperature alerts.
It was finally spotted about 8am when the security patrol wondered why the door shutters were so hot.
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@stefano About 15 years ago, the place I worked had a supercomputer. One night, the aircon in the machine room failed. The machine kept computing, and the temperature rose. It rose *quite a lot*.
Sadly, the first thing to fail from the heat was the core switch for the room. You know, the one that handles all of the network for everything in the room. Including the temperature alerts.
It was finally spotted about 8am when the security patrol wondered why the door shutters were so hot.
@darkling nice story! Unfortunately I had to manage something like that, too (A/C broken - switch dead, etc)
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@darkling nice story! Unfortunately I had to manage something like that, too (A/C broken - switch dead, etc)
@stefano Fortunately, the only thing that did fail after the aircon was the switch. (And a pair of ear muffs which had been hanging on a metal rail -- they'd melted).
The fire brigade turned up, checked everything, and ran some big positive pressure fans to get airflow through the room from one door to the other to cool everything down.
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@_elena@mastodon.social @stefano@mastodon.bsd.cafe How do I say "I knew it! I'm surrounded by assholes!" in Italian?
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@randomized @rhoot @stefano how do you monitor your sleep
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A few days ago, a client’s data center "vanished" overnight. My monitoring showed that all devices were unreachable. Not even the ISP routers responded, so I assumed a sudden connectivity drop. The strange part? Not even via 4G.
I then suspected a power failure, but the UPS should have sent an alert.
The office was closed for the holidays, but I contacted the IT manager anyway. He was home sick with a serious family issue, but he got moving.
To make a long story short: the company deals in gold and precious metals. They have an underground bunker with two-meter thick walls. They were targeted by a professional gang. They used a tactic seen in similar hits: they identify the main power line, tamper with it at night, and send a massive voltage spike through it.
The goal is to fry all alarm and surveillance systems. Even if battery-backed, they rarely survive a surge like that. Thieves count on the fact that during holidays, owners are away and fried systems can't send alerts. Monitoring companies often have reduced staff and might not notice the "silence" immediately.
That is exactly what happened here. But there is a "but": they didn't account for my Uptime Kuma instance monitoring their MikroTik router, installed just weeks ago. Since it is an external check, it flagged the lack of response from all IPs without needing an internal alert to be triggered from the inside.
The team rushed to the site and found the mess. Luckily, they found an emergency electrical crew to bypass the damage and restore the cameras and alarms. They swapped the fried server UPS with a spare and everything came back up.
The police warned that the chances of the crew returning the next night to "finish" the job were high, though seeing the systems back online would likely make them move on. They also warned that thieves sometimes break in just to destroy servers to wipe any video evidence.
Nothing happened in the end. But in the meantime, I had to sync all their data off-site (thankfully they have dual 1Gbps FTTH), set up an emergency cluster, and ensure everything was redundant.
Never rely only on internal monitoring. Never.
@stefano 10+ years ago i started volunteering at a festival. Everything was new that year including the small outdoor racks for the area field routers (Juniper MX80). They barely fit but we managed. The racks were left in the sun in the summer. It was only when we enabled Observium (LibreNMS predecessor) that graphs almost everything it gets from SNMP that we discovered the inlet temperature was getting close to 80 degrees C. #monitorallthethings
and definitely at the very least a cameo with a line from Spaceballs
sure, just continue to practice with your Italian
