P2P Guide

Table of Contents

1. Introduction
2. Architecture
3. Tutorial
4. Node Master Usage
5. Protocol
6. Node API
7. Command of a Client
8. Pseudo Node Master

Introduction

This guide describes Hyper Estraier's client/server (C/S) and peer to peer (P2P) architecture. If you haven't read user's guide yet, now is a good moment to do so.

There was several problems which where motivation for C/S architecture. estseek.cgi is inefficient because it reconnects to database for each search query. Database updates using estcmd prevents searches on same database because estcmd uses locks when doing update. To solve those problems, estmaster server process is provided. This is resident (daemon) process which has control over database and provides services via network.

This approach also leads to following advantages:

• server and clients can be distributed across different machines
• multiple clients and servers can work in parallel
• client crash doesn't leave database in inconsistent state
• clients implementation isn't specific to any programming language

Protocol between clients and servers is based on HTTP, so normal web browsers can be used as simple clients. Clients can be implemented using any languages which supports HTTP protocol like JavaScript or Flash.

Distributed processing is based on peer to peer (P2P) architecture. This allows horizontal scalability. For example, if you use 10 servers, each with million documents, you can search 10 million documents without much additional effort. Since all servers are equal, search service is provided even if some of servers are unavailable. There is notion of relevance of each index which can improve search results (if some parts of index are more important that others).

This guide describes the node API which can be used by client applications to implement search and update capabilities without using network protocol between client and server. The node API is implemented by not only C language but also Java and Ruby.

Architecture

This section describes the P2P architecture of Hyper Estraier.

Node Master and Node Server

When using multiple indexes, it is highly inefficient to run one server for each index. estmaster is server process (daemon) implemented as single process available on network through HTTP protocol on some hight port that provides services for multiple indexes. This component is called node master. Each index has it's own unique URL which is served by node server. You can think about node server as a virtual servers for each index within one node master.

Client application just need to know URL of node server and issue queries to it on any available node masters. Term node corresponds to peer in P2P architecture. Clients can also connect to node masters directly to manage configuration of that master.

Meta Search and Credit

Each node server can have unidirectional links to other node servers. This allows distributed searching called meta search. When client sends query to node server, it will forward that query to all other node servers and merge responses before sending result back to client.

Meta search is performed hierarchically. Loops in links are detected and restrained automatically, so searching is always performed on tree structured network of nodes. This allows infinite scalability just by adding additional nodes.

There is a notion of relevance for each link between nodes called credit. It's used for weighting of scores when merging results from different nodes. Document coming from node with larger credit will have higher rank in search results. Application can set links and credits for them, and this allows improving of search precision by modifying credits of frequently used nodes.

Authentication

Client connections to node master or node server are authenticated using login names and passwords. Users and permissions are defined on node masters and all node servers on that master inherit those permissions. Users are divided into two groups: super users and normal users. Normal users have permission to search index while super users also have permission to create and update indexes. Moreover, for each node, normal users are divided into administrators and guest users.

Example Application

mod_estraier is the most interesting application of the node API of Hyper Estraier. It works as a module of a Web server (Apache) and register contents mediated by its proxy mechanism. Using it as a forward proxy, you can enjoy a search engine whose targets are documents which you (or your comrades) have seen. Using it as a reverse proxy, you can add search feature to any web application as well as BBS and Wiki. That is, the greatest characteristic of the node API is helping you to develop advanced search systems combining various applications.

Tutorial

Concept of P2P seems difficult at first, so it's best to start with a tutorial which will show commands used to setup search network.

Start and Stop

First step is creation of the server root directory which contains configuration files and indexes. Following command will create casket, the server root directory:

estmaster init casket

Next, we need to start node master using:

estmaster start casket

To stop node master you can press Ctrl-C on terminal in which it's running on issue following command:

estmaster stop casket

Administration Interface

After starting node master you can access it's administration interface pointing web browser at http://localhost:1978/master_ui. This will bring HTTP authorization dialog requesting user name and password. Enter "admin" and "admin". You will be presented with administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

First option i port thatth administration commands menu.

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