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There used to be something called ec2 classic where ec2 were not part of vpc you don t get it in new accounts anymore.
What is a vpc security group. Simply put a vpc security group is really just a software firewall. A security group acts as a virtual firewall for your instance to control inbound and outbound traffic. The vpc security group is where the db instance are controlled within a vpc.
A security group is applied at instance level and of course is part of a vpc. When you launch an instance you can specify one or more security groups. After a security group is created you can create different access rules for the security group these rules will apply to any ecs that the security group contains.
Answered february 10 2017 vpc sg is a security group assigned to your vpc. A security group acts as a virtual firewall for your ec2 instances to control incoming and outgoing traffic. Security groups in a vpc is basically used to specify which traffic is allowed to or from an amazon ec2 instance.
This means you can t attach a security group to an instance in other vpc. Network acls can not filter traffic between instances present in the same. The db security group is where the db instance are controlled which are not in a vpc.
Of course if things were that simple then this would be a very short column. As you probably expected there are some important things that you need to know about vpc security groups. Network acls is used to set both allow and deny rules.
After a security group is created you can create different access rules for the security group these rules will apply to any ecs that the security group contains. Security group sg in aws works the same as firewall in os. Your ec2 instance is assigned to a vpc so the vpc sg security group becomes the outer most security layer and ec2 sg security group comes next.
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