AWS ReadOnlyAccess policy

aws iam attach-user-policy --user-name my-read-only-user --policy-arn arn:aws:iam::aws:policy/ReadOnlyAccess

See also

• aws iam [ create-user, create-group, get-user, list-users | list-policies | list-attached-user-policies | attach-user-policy | list-attached-user-policies | list-roles | get-account-summary | put-group-policy | put-role-policy | put-user-policy | create-login-profile | aws iam delete-virtual-mfa-device | aws iam list-virtual-mfa-devices | aws iam create-saml-provider | aws iam list-account-aliases | aws iam create-role | aws iam change-password| enable-mfa-device | list-instance-profiles