Networking
Security group
Quick answer
A security group is a stateful virtual firewall controlling inbound and outbound traffic for cloud instances.
A security group is a stateful virtual firewall controlling inbound and outbound traffic for cloud instances.
Why it matters
For runners, the outbound rules matter far more than the inbound ones. A default-allow egress rule is how a compromised dependency reaches the internet.
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Related
NAT gatewayA NAT gateway lets instances in a private subnet reach the internet without being reachable from it.SubnetA subnet is a segment of a virtual network's IP address range, typically classified as public or private.VPCA VPC is an isolated virtual network within a cloud provider, with its own address space and routing.