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Top Forums UNIX for Beginners Questions & Answers File Management: Removing of files from Server2 IF the same file is removed from Server1. Post 303041915 by Raza Ali on Saturday 7th of December 2019 05:44:06 AM
Old 12-07-2019
File Management: Removing of files from Server2 IF the same file is removed from Server1.

Hi Folks,

I have a requirement of file management on different servers.

Source Server is SERVER-A.

Two servers will fetch files from SERVER-A: SERVER1 and SERVER2.

4th SERVER is SERVER-B, It will fetch files from SERVER1. If SERVER1 goes DOWN, SERVER-B will fetch pending files from SERVER2(no duplicity).

Suppose, Server1 has 4 files file1/2/3/4 (It fetched it from SERVER-A) and SERVER2 also 4 files file1/2/3/4(it also fetched it from SERVER-A). There is no SYNC between SERVER1 and 2.

Now SERVER-B will fetch file1/2 from SERVER1 and it will delete same. So SERVER1 has now file3/4. SERVER1 goes down.
So SERVER-B will start picking file from SERVER2(SERVERB will be manually pointed to SERVER2), but it should only pick file3/4 as file1/2 were already picked.

I need a mechanism by using which - If SERVER-B deletes a file from SERVER1, then it also get deleted from SERVER2 - NOTE SERVER-B is not capable to do this, so this has to be done from SERVER1 end. If file1/2 is removed from SERVER1, then it should delete it from SERVER2.

Please let me know if more clarification is required.

I think, RSYNC is one of the way, but requirement is limited.

Thanks to all in advance.

Raza Ali
 

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CREATE 
SERVER(7) PostgreSQL 9.2.7 Documentation CREATE SERVER(7) NAME
CREATE_SERVER - define a new foreign server SYNOPSIS
CREATE SERVER server_name [ TYPE 'server_type' ] [ VERSION 'server_version' ] FOREIGN DATA WRAPPER fdw_name [ OPTIONS ( option 'value' [, ... ] ) ] DESCRIPTION
CREATE SERVER defines a new foreign server. The user who defines the server becomes its owner. A foreign server typically encapsulates connection information that a foreign-data wrapper uses to access an external data resource. Additional user-specific connection information may be specified by means of user mappings. The server name must be unique within the database. Creating a server requires USAGE privilege on the foreign-data wrapper being used. PARAMETERS
server_name The name of the foreign server to be created. server_type Optional server type. server_version Optional server version. fdw_name The name of the foreign-data wrapper that manages the server. OPTIONS ( option 'value' [, ... ] ) This clause specifies the options for the server. The options typically define the connection details of the server, but the actual names and values are dependent on the server's foreign-data wrapper. NOTES
When using the dblink module (see dblink), the foreign server name can be used as an argument of the dblink_connect(3) function to indicate the connection parameters. See also there for more examples. It is necessary to have the USAGE privilege on the foreign server to be able to use it in this way. EXAMPLES
Create a server foo that uses the built-in foreign-data wrapper default: CREATE SERVER foo FOREIGN DATA WRAPPER "default"; Create a server myserver that uses the foreign-data wrapper pgsql: CREATE SERVER myserver FOREIGN DATA WRAPPER pgsql OPTIONS (host 'foo', dbname 'foodb', port '5432'); COMPATIBILITY
CREATE SERVER conforms to ISO/IEC 9075-9 (SQL/MED). SEE ALSO
ALTER SERVER (ALTER_SERVER(7)), DROP SERVER (DROP_SERVER(7)), CREATE FOREIGN DATA WRAPPER (CREATE_FOREIGN_DATA_WRAPPER(7)), CREATE USER MAPPING (CREATE_USER_MAPPING(7)) PostgreSQL 9.2.7 2014-02-17 CREATE SERVER(7)
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