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Postmortem: 2017-04-11 Firewall Outage | Circonus
"We use a pair of firewall devices in an active/passive configuration with automatic failover should one of the devices become unresponsive. The firewall device in question went down, and automatic failover did not trigger for an unknown reason (we are still investigating). When we realized the problem, we killed off the bad firewall device, causing the secondary to promote itself to master and service to be restored."
postmortem 
august 2017 by peakscale
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