connection-type database user network-address login-method options in .NET

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connection-type database user network-address login-method options
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The following sections describe each of these fields
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Connection-type Field
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The connection-type field defines the method used by the client to connect to the PostgreSQL system There are four types of connections that are supported by PostgreSQL: local host Uses a local Unix-domain style socket on the system Uses a plain or SSL-encrypted TCP/IP socket
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hostssl Uses an SSL-encrypted TCP/IP socket hostnossl Uses a plain TCP/IP socket Remember that to allow remote clients to connect, you must have enabled the Listen on All Addresses feature during the PostgreSQL installation (see 2) If you did not do that, and now want to allow remote clients to connect, you must change the listen_addresses entry in the postgresqlconf configuration file, discussed later in this chapter
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Database Field
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The database field defines which PostgreSQL databases the record controls access to There are several formats that can be used for this field: A single database name A comma-separated list of database names The keyword all, for all databases configured on the system The keyword sameuser, for a database with the same name as the user account The keyword samerole, for a database with the same name as a role the user is a member of A filename, preceded by an at sign (@), to specify a file containing a text list of database names The record only applies to the databases specified in this field Clients matching this record will not be given access to any nonmatching database in the system, unless specified in a separate record in the configuration file
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The user field defines which PostgreSQL user accounts are controlled by this record Remember, this applies to the PostgreSQL username, and not to the logged-in username on the operating system Similar to the database field, there are a few different formats you can use for this field: A single username A comma-separated list of usernames
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A role name, preceded by a plus sign (+), to enable all users who are members of the role A filename, preceded by an at sign (@), to specify a file containing a text list of usernames The user accounts listed in the record are allowed access to the databases listed in the record This does not override normal PostgreSQL database security on tables (discussed in 4) once a client is connected to the database, but provides a front-end access control method for remote clients to gain initial entry into the database
Network-address Field
The network-address field defines which network hosts clients are allowed to connect to the PostgreSQL system from This is a handy way to restrict access to your system to clients on your local network, or even to just one specific host on your network The network address cannot be written using a host s domain name The networkaddress field must be entered in one of two formats: A host address and subnet mask pair A Classless Inter-Domain Routing (CIDR)-formatted address The old method of specifying host addresses is the host address/subnet mask pair method This uses two separate values: a dotted-decimal host or network address, and a dotted-decimal subnet mask address The subnet mask defines how many bits of the address are used to define the network address and host address For example, the subnet mask 255255255255 is used to define a single host on the network The subnet mask 2552552550 defines a subnet of hosts that uses the fourth octet in the network address for the host address The CIDR format is becoming more popular in the networking world This method uses a host or network address in dotted-decimal notation, along with a single integer value to define the number of bits enabled in the subnet mask For example, the CIDR address 192168010/32 indicates the host at address 192168010, using all 32 bits for the subnet mask, or 255255255255 This defines a single host address on the network The CIDR address 19216800/27 indicates all of the hosts on subnet 19216800, using subnet mask 2552552550 This provides for any host whose address is from 19216801 to 1921680254 to connect to the databases listed in the record
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