The value of the security_group argument in ucloud_instance is a security group id while the list is expected.

[hanyouqing]

An instance always associates with more than 1 security_group, so the list would be the preferred data type for security_group.

[shawnmssu]

Currently, We are revising the security group. At this moment, the support function of the security group is relatively limited. Our security group is similar to a firewall, a UHost instance can only be bound to one firewall.