name : attach-classic-link-vpc.rst **To link (attach) an EC2-Classic instance to a VPC** This example links instance i-1234567890abcdef0 to VPC vpc-88888888 through the VPC security group sg-12312312. Command:: aws ec2 attach-classic-link-vpc --instance-id i-1234567890abcdef0 --vpc-id vpc-88888888 --groups sg-12312312 Output:: { "Return": true }