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                            [TOC]
# 介紹
* StatefulSets（有狀態系統服務設計）是PetSets的替代品
* StatefulSets特性
    * 穩定性：唯一的網絡標識符
    * 持久化：持久化存儲
    * 有序擴展和部署
    * 有序的刪除和終止
    * 有序的自動滾動更新
* 使用StatefulSet的Pod必須基于請求storeage class的PersistentVolume Provisioner或者提前配置
* 刪除或者縮放StatefulSet不會刪除關聯的Volume
* 需要Headless Service負載Pods的網絡一致性
*  不可將StatefulSet的pod.Spec.TerminationGracePeriodSeconds設置為0
*  部署和擴展
    * 對于具有N個副本的StatefulSet，當部署Pod時，將會順序從{0..N-1}開始創建
    * 刪除Pods時，將會從{N-1..0}的順序終止
    * 對Pod擴展時，前面的Pod必須為Running和Ready狀態
    * 縮放時，它的所有前輩必須是Runnign和Ready狀態
    * 終止Pod前，所有的successors必須完全關閉
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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