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Commitc774d31

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Choose ports for test servers less likely to result in conflicts
If we choose ports in the range typically used for ephemeral ports thereis a danger of encountering a port conflict due to a race conditionbetween the time we choose the port in a range below that typically usedto allocate ephemeral ports, but higher than the range typically used bywell known services.Author: Jelte Fenema-Nio, with some editing by me.Discussion:https://postgr.es/m/d6ee8761-39d1-0033-1afb-d5a57ee056f2@gmail.comBackpatch to all live branches (12 and up)
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‎src/test/perl/PostgresNode.pm‎

Lines changed: 11 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -116,6 +116,14 @@ our ($use_tcp, $test_localhost, $test_pghost, $last_host_assigned,
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# list of file reservations made by get_free_port
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my@port_reservation_files;
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# We want to choose a server port above the range that servers typically use
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# on Unix systems and below the range those systems typically use for ephemeral
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# client ports.
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# That way we minimize the risk of getting a port collision. These two values
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# are chosen to reflect that. We will always choose a port in this range.
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my$port_lower_bound = 10200;
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my$port_upper_bound = 32767;
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INIT
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{
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@@ -129,7 +137,8 @@ INIT
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$ENV{PGDATABASE} ='postgres';
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# Tracking of last port value assigned to accelerate free port lookup.
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$last_port_assigned =int(rand() * 16384) + 49152;
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my$num_ports =$port_upper_bound -$port_lower_bound;
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$last_port_assigned =int(rand() *$num_ports) +$port_lower_bound;
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# Set the port lock directory
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@@ -1242,7 +1251,7 @@ sub get_free_port
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{
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# advance $port, wrapping correctly around range end
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$port =49152if ++$port >= 65536;
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$port =$port_lower_boundif ++$port >$port_upper_bound;
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print"# Checking port$port\n";
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# Check first that candidate port number is not included in

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