To avoid completely cutting off a host via incorrect or malformed policy, Calico Cloud has a failsafe mechanism that keeps various pinholes open in the firewall.
By default, Calico Cloud keeps the following ports open on all host endpoints:
|179||TCP||Inbound & Outbound||BGP access (Calico networking)|
|6443||TCP||Inbound & Outbound||Kubernetes API server access|
The lists of failsafe ports can be configured via the configuration parameters
described in Configuring
can be disabled by setting each configuration value to "none".
Removing the inbound failsafe rules can leave a host inaccessible.
Removing the outbound failsafe rules can leave Felix unable to connect to the datastore.
Before disabling the failsafe rules, we recommend creating a policy to replace it with more-specific rules for your environment: see Creating policy for basic connectivity.