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Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044138 by Neo on Saturday 15th of February 2020 02:28:08 AM
Old 02-15-2020
Next:

I have some old "cyberspace situational awareness" PHP code I used for a visualization project a few years ago, which captures and stores details information on web session activity; this code has proven handy identifying rouge bots in the past.

So, I have modified that code to capture and store detailed session information, including the number of hits per IP address, the user agent string, country code, etc. when the 1 minute load average is above 20 and less than 50.

Code:
$theload = getLoadAvg();
if (floatval($theload) > 20.0 && floatval($theload) < 50.0) 
{
  /// the old CSA code to parse web session activity and store the results in the DB
}

So, let's see what happens the next time we get a spike... this should be interesting.


Code:
mysql> describe neo_csa_session_manager;
+--------------+------------------+------+-----+---------+----------------+
| Field        | Type             | Null | Key | Default | Extra          |
+--------------+------------------+------+-----+---------+----------------+
| id           | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| user_id      | int(11)          | NO   | MUL | 0       |                |
| session_id   | varchar(255)     | NO   |     | NULL    |                |
| url          | text             | NO   |     | NULL    |                |
| ip_address   | varchar(45)      | NO   | MUL | NULL    |                |
| user_agent   | varchar(255)     | NO   |     | NULL    |                |
| bot_flag     | tinyint(1)       | NO   |     | 0       |                |
| robot_txt    | mediumint(6)     | NO   |     | 0       |                |
| sitemap      | mediumint(6)     | NO   |     | 0       |                |
| riskscore    | int(11)          | NO   |     | 0       |                |
| country_iso2 | varchar(2)       | NO   |     | UN      |                |
| country      | varchar(50)      | NO   |     | UNKNOWN |                |
| hitcount     | int(10) unsigned | NO   |     | 1       |                |
| firstseen    | bigint(11)       | NO   |     | NULL    |                |
| unixtime     | bigint(11)       | YES  |     | NULL    |                |
| longitude    | float            | NO   |     | 0       |                |
| latitude     | float            | NO   |     | 0       |                |
+--------------+------------------+------+-----+---------+----------------+
17 rows in set (0.00 sec)

This User Gave Thanks to Neo For This Post:
 

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CUBRID_NEXT_RESULT(3)							 1						     CUBRID_NEXT_RESULT(3)

cubrid_next_result - Get result of next query when executing multiple SQL statements

SYNOPSIS
bool cubrid_next_result (resource $result) DESCRIPTION
The cubrid_next_result(3) function is used to get results of next query if multiple SQL statements are executed and CUBRID_EXEC_QUERY_ALL flag is set upon cubrid_execute(3). PARAMETERS
o $result -$result comes from a call to cubrid_execute(3) RETURN VALUES
TRUE, when process is successful. FALSE, when process is unsuccessful. EXAMPLES
Example #1 cubrid_next_result(3) example <?php $conn = cubrid_connect("127.0.0.1", 33000, "demodb", "dba"); $sql_stmt = "SELECT * FROM code; SELECT * FROM history WHERE host_year=2004 AND event_code=20281"; $res = cubrid_execute($conn, $sql_stmt, CUBRID_EXEC_QUERY_ALL); get_result_info($res); cubrid_next_result($res); get_result_info($res); function get_result_info($req) { printf(" ------------ get_result_info -------------------- "); $row_num = cubrid_num_rows($req); $col_num = cubrid_num_cols($req); $column_name_list = cubrid_column_names($req); $column_type_list = cubrid_column_types($req); $column_last_name = cubrid_field_name($req, $col_num - 1); $column_last_table = cubrid_field_table($req, $col_num - 1); $column_last_type = cubrid_field_type($req, $col_num - 1); $column_last_len = cubrid_field_len($req, $col_num - 1); $column_1_flags = cubrid_field_flags($req, 1); printf("%-30s %d ", "Row count:", $row_num); printf("%-30s %d ", "Column count:", $col_num); printf(" "); printf("%-30s %-30s %-15s ", "Column Names", "Column Types", "Column Len"); printf("------------------------------------------------------------------------------ "); $size = count($column_name_list); for($i = 0; $i < $size; $i++) { $column_len = cubrid_field_len($req, $i); printf("%-30s %-30s %-15s ", $column_name_list[$i], $column_type_list[$i], $column_len); } printf(" "); printf("%-30s %s ", "Last Column Name:", $column_last_name); printf("%-30s %s ", "Last Column Table:", $column_last_table); printf("%-30s %s ", "Last Column Type:", $column_last_type); printf("%-30s %d ", "Last Column Len:", $column_last_len); printf("%-30s %s ", "Second Column Flags:", $column_1_flags); printf(" "); } ?> The above example will output: ------------ get_result_info -------------------- Row count: 6 Column count: 2 Column Names Column Types Column Len ------------------------------------------------------------------------------ s_name char 1 f_name varchar 6 Last Column Name: f_name Last Column Table: code Last Column Type: varchar Last Column Len: 6 Second Column Flags: ------------ get_result_info -------------------- Row count: 4 Column count: 5 Column Names Column Types Column Len ------------------------------------------------------------------------------ event_code integer 11 athlete varchar 40 host_year integer 11 score varchar 10 unit varchar 5 Last Column Name: unit Last Column Table: history Last Column Type: varchar Last Column Len: 5 Second Column Flags: not_null primary_key unique_key SEE ALSO
cubrid_execute(3). PHP Documentation Group CUBRID_NEXT_RESULT(3)
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