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Overview
In order to provide bit-level preservation, we use the Audit Control Environment Audit Manager to run periodic fixity checks on Bags stored in Chronopolis. The ACE Audit Manager webapp web application gives us two levels of verification when doing our checks: the first is that the file is valid, and the second is that the digest for the file is valid.
When distributing a Bag throughout the Chronopolis network, ACE Tokens are generated and distributed alongside the Bag so that we have a single source for the ACE Tokens. The ACE Tokens are loaded before the initial audit of a Bag which provides us assurance that the digests for each file are correct, as any file which generates an incorrect fixity will be flagged as corrupt through the Token validation.
In addition, there is timestamp information stored in the ACE Tokens which serves as a piece of provenance for when a file was first validated by Chronopolis.
Links
- Gitlab: https://gitlab.umiacs.umd.edu/adapt/ace
- Builds: http://adaptci01.umiacs.umd.edu/resource/ace
- Audit Control Environment
- ACE Releases
- ACE API DocumentationAPI: https://ace-docs.umiacs.io/
Installation
Installation instructions are available on the ACE Wiki. PLEASE NOTE: the IMS has moved. Please use ims.tdl.org as the IMS address.
Administration
Database Connection Setup
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<Resource name="jdbc/aceamdb" auth="Container" factory="com.zaxxer.hikari.HikariJNDIFactory" type="javax.sql.DataSource" minimumIdle="10" maximumPoolSize="32" connectionTimeout="300000" driverClassName="com.mysql.jdbc.Driver" jdbcUrl="jdbc:mysql://localhost/aceinnodb?characterEncoding=UTF-8" dataSource.user="ace" dataSource.password="-----------" /> |
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Collection Management
Removing A Collection
When viewing a collection, select the Remove Collection
option from the drop-down list of available actions. You will be prompted to acknowledge the delete, after which all files, tokens, and logging events will be removed from ACE.
On larger collections, it can take time for all the monitored information to be removed, but ACE can still be browsed during this time.
Removing A File
Browse Servlet
When viewing a collection, select the Browse Servlet
from the list of available actions. This will bring you to a separate servlet showing a list of all monitored files and directories for the collection. Selecting a File will then bring up information about the File, including actions to take on that item. Selecting Remove
will remove the File from tracking in the Collection, and the page will likely need to be refreshed to accurately display the contents of the Collection.
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If a File has been intentionally removed from disk and needs to be removed from ACE AM, a File Audit can be run in order for it to be marked as Missing
. Once a file has been marked as Missing, the Report Servlet
can be selected in order to view the Report from the latest Audit. From the Report Servlet
, the missing file can be removed by using any of the Remove actions (all, selection, single). ACE AM will then prompt for confirmation to remove the File(s) after which they will no longer be tracked. A File Audit
should be run after removing any files from the Report Servlet
so that the error status of the collection can be cleared.
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Peer Auditing (Collection Compare)
Creating Peer User
Creating a new user is done through the Accounts
servlet which is available from the top-most navigation bar in ACE AM. Supplying an account with the following properties allows a peer to log in and provide any comparison operations without allowing them to make changes to your local ACE.
Adding A Peer
Adding a site is done through the /PartnerSite page. Currently no link is available on the main ACE page - only through editing a collection's settings: Add Peers -> Add New
or the Compare Collection -> Add New
under Partner
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Running the Audit Auditing
In order to initiate an on demand peer comparison, the Compare Collection
option must be selected when viewing a collection. Then, selecting the Partner
option will bring up a list of all peer ACE AMs, which can be selected. ACE will try to find the matching collection by default, but if it is not found you must select the collection to compare to your self.
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For example at UCSD, aceServer is the ACE database server, aceUser is the DB account, and aceDB is the ACE database
mysqldump -h aceServer -u aceUser aceDB -p > ucsd-ace-2019-06-21.sql
gzip ucsd-ace-2019-06-21.sql
Upload to chron-ingest
Assumes the current user has an SSH public key in the chronopolis user authorized_keys for incoming
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