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google-cloud-platformcentos7firewalliptables

GCP overriding iptables rules in centOS


I created a CentOS machine from base image that can be found in GCP. After powering on I looked at the iptables rule, seems like everything is on enter image description here

I removed all the firewall rules and chained ones as well and created some firewall rules and saved them. When I restarted the machine all the newly created firewall rules were gone and the default ones came online. Not sure if GCP overrides firewall rules after reboot?


Solution

  • Enabled VPC firewall rules are always enforced, protecting your instances regardless of their configuration and operating system, even if they have not started up.