annotate mod_storage_multi/README.markdown @ 5503:320593cf7d90

mod_oidc_userinfo_vcard4: Advertise OpenID scopes via new mechanism
author Kim Alvefur <zash@zash.se>
date Thu, 01 Jun 2023 18:16:18 +0200
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1 ---
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2 summary: Multi-backend storage module (WIP)
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3 labels:
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4 - NeedDocs
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5 - Stage-Alpha
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6 ...
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7
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8 Introduction
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9 ============
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10
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11 This module attemtps to provide a storage driver that is really multiple
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12 storage drivers. This could be used for storage error tolerance or
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13 caching of data in a faster storage driver.
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14
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15 Configuration
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16 =============
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17
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18 An example:
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19
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20 ``` {.lua}
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21 storage = "multi"
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22 storage_multi_policy = "all"
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23 storage_multi = {
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24 "memory",
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25 "internal",
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26 "sql"
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27 }
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28 ```
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29
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30 Here data would be first read from or written to [mod\_storage\_memory],
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31 then internal storage, then SQL storage. For reads, the first successful
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32 read will be used. For writes, it depends on the `storage_multi_policy`
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33 option. If set to `"all"`, then all storage backends must report success
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34 for the write to be considered successful. Other options are `"one"` and
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35 `"majority"`.