Operations grimoire/Checklist router post-restart
From Nasqueron Agora
A router-001 restart severes GRE tunnels and their existing TCP connections.
As such, this checklist notes the known issues when private network is disrupted.
To partially prevent this, a blue/green deployment or immutable artifacts should be encouraged. It's recommended for the next non urgent upgrade to create router-002 and move GRE connections to it. The checklist should still be checked.
As most services are currently on hyper-001, they don't need the router to communicate, so lot of things will still be working.
They require a GRE tunnel between server with viperserv role and the router to connect to both complector (Vault) and a db-B server (MariaDB).
- Dæghrefn: MySQL is normally at periodic interval reconnected, but you can trigger this with
- Wearg: MySQL does NOT reconnect, and that will probably exit from the timer
.tcl sqlrehashto reconnect to MySQL
.tcl broker::on_tickto reconnect to broker and start timer to get message
.tcl utimersto ensure timer is good, you should see a
T1862 offers to detect MySQL issues and reconnect.