A Backend to tie them all?
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The document discusses different types of backends that can be used to store directory data in LDAP servers. It describes in-memory, LDIF, B-tree, MVCC, RDBMS, and NoSQL backends. Each backend has different performance, size, cost and reliability characteristics that make them suitable for different use cases like caching, tests, or storing very large directories.
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Vamsi Krishna N [2.2 Yrs Exp]![Vamsi Krishna N [2.2 Yrs Exp]](https://cdn.slidesharecdn.com/ss_thumbnails/a39007bb-5658-4141-8c5b-547c594b6da8-161019114520-thumbnail.jpg?width=560&fit=bounds)
Vamsi Krishna N [2.2 Yrs Exp]Vamsi Krishna Nerella This document contains a resume for Vamsi Krishna Nerella. It summarizes his professional experience working as an Associate Software Engineer for Virtusa Polaris ConsultancyServices since July 2014, where he supports Enterprise Content Management systems like Documentum. It also lists his education as a Bachelor of Computer Applications from Krishna University in 2014. His skills include Java, Linux, Oracle database, Apache Tomcat, and Documentum content services. He has experience deploying builds, coordinating releases, and providing support for projects like Standard and Poors.
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With the adoption of cloud services and the reliability and resiliency it offers, enterprises are eager to understand how many of their legacy applications can be containerized.
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2) Virtual data platforms use thin cloning and compression to reduce storage needs and provision environments quickly. This helps development, QA, recovery scenarios and enables faster business intelligence refreshes.
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Assessment item 1 File Systems and Advanced Scripting .docx
Assessment item 1 File Systems and Advanced Scripting .docxdavezstarr61655 Assessment item 1
File Systems and Advanced Scripting
Value: 15%
Due Date: 26-Aug-2018
Return Date: 31-Aug-2018
Length: 15 - 20 pages including screenshots
Submission method options: Alternative submission method
Task
back to top
In this assignment you will develop simple scripts to manage the user and file system whilst
developing some expertise in managing a complex file system.
Part 1: Automated Account Management (4 marks)
You have been asked by your boss to prepare two shell scripts which manage user information.
You are to prepare a simple shell script which reads a text file called users.txt. The file is in the
form
dfs /home/dfs Daniel Saffioti
and creates these users on the system without any interactive input. To do this you will need to
use the adduser(1) and passwd(1) commands. You will need to randomly produce the password
and report this to the administrator.
You can assume the fields being username, home directory and GCOS string are separate by a
single white space.
You can assume all users are in the same group.
The program should output the username and generated password once created.
Part 2: Design of a File System (3 marks)
https://outlines.csu.edu.au/delivery/published/ITC333/201860/SM/I/outline.html#contentPanel
You work for the Information Technology Department in your University and you have been
asked to build a server to store user data (home directories).
The volumes can grow without bounds, so it was felt that the ZFS file system should be used for
each volume. The operating system itself need not be on a ZFS volume.
All volumes including the operating system should be engineered in such a way to ensure the
best data protection is afforded in the event of local disk failure. It is expected that no more than
1 hours worth of data will be lost.
The volumes required are as follows:
1. uni0 with mount point /users/ug& quota of 200G.
2. uni1 with mount point /users/pg& quota of 200G.
3. uni2 with mount point /users/deleted& reservation of 100G.
4. uni3 with mount point /users/staff& reservation of 100G.
5. uni4 with mount point /users/guest & reservation of 250G.
Given the above your task is as follows define a strategy for how you will ensure the volumes
outlined above are provisioned whilst ensuring there data protection. Document this accordingly
along with a suitable rationale for your design.
Part 3: Implementing the Filesystem (4 marks)
Given the strategy defined in part two, your job is to implement the storage system.
1. To do this install the latest version of Ubuntu Server on a virtual machine. You will need to
ensure the networking is bridged and the root portioning is managed appropriately. You will
need to add additional virtual disks to meet the storage needs above.
2. Install the ZFS package and configure it such that pools of storage are created to meet the above
requirements including redundan.
DELDroid: Determination & Enforcement of Least Privilege Architecture in AnDroid
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Android relies on a permission model to secure the system's resources and apps. In Android, since the permissions are granted at the granularity of apps, and all components in an app inherit those permissions, an app's components are over-privileged, i.e., components are granted more privileges than they actually need. Systematic violation of least-privilege principle in Android is the root cause of many security vulnerabilities. To mitigate this issue, we have developed DELDroid, an automated system for determination of least privilege architecture in Android and its enforcement at runtime. A key contribution of DELDroid is the ability to limit the privileges granted to apps without modifying them. DELDroid utilizes static analysis techniques to extract the exact privileges each component needs. A Multiple-Domain Matrix representation of the system's architecture is then used to automatically analyze the security posture of the system and derive its least-privilege architecture. Our experiments on hundreds of real-world apps corroborate DELDroid's ability in effectively establishing the least-privilege architecture and its benefits in alleviating the security threats.
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A Backend to tie them all?
- 1. A backend to tie them all ?
- 2. Emmanuel Lécharny Apache Software Foundation member Chairman of MINA project PMC of Apache Directory Project IKTEK Owner (www.iktek.com) www.iktek@com, [email protected]
- 3. What is the Backend anyway ? Entries + Indexes
- 4. Entries/Index dn: dc=example,dc=com objectclass: top objectclass: domain dc: example dn: cn=user1,dc=example,dc=com objectClass: top objectClass: person cn: user1 sn: User one dn: cn=user2,dc=example,dc=com objectClass: top objectClass: person cn: user2 sn: User two
- 7. In memory Backend Internal data structures : Btrees, AVLs, HashMap, Lists, ...
- 8. In Memory Backend Usage Cache Ultra-fast server No local storage Tests
- 10. LDIF Backend
- 11. LDIF Backend version: 1 dn: dc=example,dc=com objectclass: top objectclass: domain dc: example dn: cn=user1,dc=example,dc=com objectClass: top objectClass: person cn: user1 sn: User one dn: cn=user2,dc=example,dc=com objectClass: top objectClass: person cn: user2 sn: User two
- 14. BTree Backend
- 15. BTree Backend
- 16. BTree Backend Various possible Implementations Btree, B+tree, B*Tree, ...
- 17. BTree Backend Average Worst Case Space Search O( n ) O( n ) O( log n ) O( log n ) Insert O( log n ) O( log n ) Delete O( log n ) O( log n )
- 18. BTree Backend Usage : Pretty much everything Improvements : Hashed keys Cache
- 20. MVCC Backend
- 21. MVCC Backend
- 22. MVCC Backend Usage : Pretty much everything
- 24. RDBMS Backend
- 25. RDBMS Database
- 26. RDBMS Backend Usage : Existing DBAs... ApacheDS experimentation : Oracle Partition http://svn.apache.org/viewvc/directory/apacheds/branches/ldif-partition/oracle-partition/?pathrev=982537
- 28. NoSQL Backend
- 29. NoSQL Backend Distributed Configuration Service Distributed File System
- 30. NoSQL Backend Usage : Replicated backend Huge base ApacheDS experimentation : http://www.stefan-seelmann.de/media/presentations/3rdOpenHUG2010_Seelmann_ApacheDirectoryHBase.pdf http://svn.apache.org/repos/asf/directory/sandbox/seelmann/
- 32. Thanks!