Configuring a Lifecycle Rule

Procedure

1. In the bucket list, click the bucket you want to operate. The Overview page is displayed.
2. In the Basic Configurations area, click Lifecycle Rules. The Lifecycle Rules page is displayed.

   Alternatively, you can choose Basic Configurations > Lifecycle Rules in the navigation pane.

3. Click Create.
4. Configure a lifecycle rule.
   Basic Information:

   • Status:

     Select Enable to enable the lifecycle rule.

   • Rule Name:

     It identifies a lifecycle rule. A rule name can contain a maximum of 255 characters.

   • Applies To: Can be set to Object name prefix or Bucket.
     • Object name prefix: Objects with this specified prefix will be managed by the lifecycle rule. The prefix cannot start with a slash (/) or contain two consecutive slashes (//), and cannot contain the following special characters: \:*?"<>|
     • Bucket: All objects in the bucket will be managed by the lifecycle rule.

   

   • If the specified prefix is overlapping with the prefix set in an existing lifecycle rule, OBS regards these two rules as one and forbids you to configure the one you are configuring. For example, if there is already a rule with prefix abc in OBS, you cannot configure another rule whose prefix starts with abc.
   • If there is already a lifecycle rule based on an object prefix, you are not allowed to configure another rule that is applied to the entire bucket.
   • If a lifecycle rule has been configured for the entire bucket, no more rules that apply to object name prefix can be added.

   Current Version or Historical Version:

   

   • Current Version and Historical Version are two concepts for versioning. If versioning is enabled for a bucket, uploading objects with the same name to the bucket creates different object versions. The last uploaded object is called the current version, while those previously uploaded are called historical versions.
   • You can configure either the Current Version or Historical Version, or both of them.
   • Transition to Warm: After this number of days since the last update, objects meeting specified conditions will be transitioned to Warm. This number must be at least 30.
   • Transition to Cold: After this number of days since the last update, objects meeting specified conditions will be transitioned to Cold. If you configure to transition objects first to Warm and then Cold, the objects must stay Warm at least 30 days before they can be transitioned to Cold. If only transition to Cold is used, but transition to Warm is not, there is no limit on the number of days for transition.
   • Delete Objects After (Days): After this number of days since the last update, objects meeting certain conditions will be expired and then deleted. This number must be larger than that specified for any of the transition operations.
   For example, on January 7, 2015, you saved the following files in OBS:

   • log/test1.log
   • log/test2.log
   • doc/example.doc
   • doc/good.txt
   On January 10, 2015, you saved another four files:

   • log/clientlog.log
   • log/serverlog.log
   • doc/work.doc
   • doc/travel.txt

   On January 10, 2015, you set the objects prefixed with log to expire one day later. You might encounter the following situations:

   • Objects log/test1.log and log/test2.log uploaded on January 7, 2015 might be deleted after the last system scan. The deletion could happen on January 10, 2015 or January 11, 2015, depending on the time of the last system scan.
   • Objects log/clientlog.log and log/serverlog.log uploaded on January 10, 2015 might be deleted on January 11, 2015 or January 12, 2015, depending on whether they have been stored for over one day (since their last update) when the system scan happened.

   On the day of operation, you can set the objects with the name prefix log to be transitioned to Warm 30 days later, transitioned to Cold 60 days later, and deleted 100 days later, then OBS will transition log/clientlog.log, log/serverlog.log, log/test1.log, and log/test2.log to Warm when their storage duration exceeds 30 days, transition them to Cold when their storage duration exceeds 60 days, and delete them when their storage duration exceeds 100 days, respectively.

   

   In theory, it takes 24 hours at most to execute a lifecycle rule. Because OBS calculates the lifecycle of an object from the next 00:00 (UTC time) after the object is uploaded, there may be a delay in transitioning objects between storage classes and deleting expired objects. Generally, the delay does not exceed 48 hours. If you make changes to an existing lifecycle rule, the rule will take effect again.

5. Click OK to complete the lifecycle rule configuration.

Follow-up Procedure

You can click Edit in the Operation column of a lifecycle rule to edit the rule. You can also click Disable or Enable to disable or enable it.

If you want to delete more than one lifecycle rule at a time, select them and click Delete above the list.