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* The OpenVZ software reserves the IDs ranging from 0 to 100. Though OpenVZ uses only ID 0, future versions might use additional Container IDs for internal needs. Please ''To facilitate upgrading, please do not create Containers with IDs below 101.''
→Choosing Container ID: +to facititate upgrading
* ID 0 is used for the Hardware Node itself. You cannot and should not try to create a Container with ID 0.
The only strict requirement for a Container ID is to be unique for a particular Hardware Node. However, if you are going to have several computers running OpenVZ, we recommend assigning different Container ID ranges to them. For example, on Hardware Node 1 you create Containers within the range of IDs from 101 to 1000; on Hardware Node 2 you use the range from 1001 to 2000, and so on. This approach makes it easier to remember on which Hardware Node a Container has been created, and eliminates the possibility of Container ID conflicts when a Container migrates from one Hardware Node to another.
