问题 here in this syntax of "ContainerDefinitions":[{Memory:500}] in AWS::ECS::TaskDefinition , Memory property refers to virtual address space(hard limit) of docker container process in root CGROUP. We are launching a jenkins container process on AWS EC2 using cloudformation resource type AWS::ECS::TaskDefinition . AWS EC2 is a 64 bit Linux OS. On 32 bit Linux OS, virtual address space of a process, can go upto 3 GB. On 64 bit Linux OS, virtual adress space of a process, can go upto Terabytes. We