MySQLへのリモート接続はランダムに約20％の時間で行われます

Question

私は自分のUbuntu VPSにインストールしてphpMyAdmin経由で管理している私のMySQLを使って何が起こっているのか非常に混乱しています。私はArduinoを使ってデータベースに接続し、2秒ごとにテーブル値に1を加えますが、時間の約20％しか接続できず、長い間接続されていません。これは、XAMPPを使用して私のマシン上でMySQLを使用したときにうまく動作したので、MySQLまたはphpMyAdminの設定で何かでなければなりません。接続に失敗したときのエラーは、「Error 7 =」のようにいつも異なるようです。

あなたが見ることができるように、ポート3306が開いていると、リモート接続を監視する：

私は私のWebブラウザでphpMyAdminを介して、rootとして接続問題はありません。ここで

（別名my.cnfの）私のmysqld.cnfです：

# 
 
# The MySQL database server configuration file. 
 
# 
 
# You can copy this to one of: 
 
# - "/etc/mysql/my.cnf" to set global options, 
 
# - "~/.my.cnf" to set user-specific options. 
 
# 
 
# One can use all long options that the program supports. 
 
# Run program with --help to get a list of available options and with 
 
# --print-defaults to see which it would actually understand and use. 
 
# 
 
# For explanations see 
 
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html 
 

 
# This will be passed to all mysql clients 
 
# It has been reported that passwords should be enclosed with ticks/quotes 
 
# escpecially if they contain "#" chars... 
 
# Remember to edit /etc/mysql/debian.cnf when changing the socket location. 
 

 
# Here is entries for some specific programs 
 
# The following values assume you have at least 32M ram 
 

 
[mysqld_safe] 
 
socket \t \t = /var/run/mysqld/mysqld.sock 
 
nice \t \t = 0 
 

 
[mysqld] 
 
# 
 
# * Basic Settings 
 
# 
 
user \t \t = mysql 
 
pid-file \t = /var/run/mysqld/mysqld.pid 
 
socket \t \t = /var/run/mysqld/mysqld.sock 
 
port \t \t = 3306 
 
basedir \t \t = /usr 
 
datadir \t \t = /var/lib/mysql 
 
tmpdir \t \t = /tmp 
 
lc-messages-dir \t = /usr/share/mysql 
 
skip-external-locking 
 
# 
 
# Instead of skip-networking the default is now to listen only on 
 
# localhost which is more compatible and is not less secure. 
 
#bind-address \t \t = 127.0.0.1 
 
# 
 
# * Fine Tuning 
 
# 
 
key_buffer_size \t \t = 16M 
 
max_allowed_packet \t = 16M 
 
thread_stack \t \t = 192K 
 
thread_cache_size  = 8 
 
# This replaces the startup script and checks MyISAM tables if needed 
 
# the first time they are touched 
 
myisam-recover-options = BACKUP 
 
#max_connections  = 100 
 
#table_cache   = 64 
 
#thread_concurrency  = 10 
 
# 
 
# * Query Cache Configuration 
 
# 
 
query_cache_limit \t = 1M 
 
query_cache_size  = 16M 
 
# 
 
# * Logging and Replication 
 
# 
 
# Both location gets rotated by the cronjob. 
 
# Be aware that this log type is a performance killer. 
 
# As of 5.1 you can enable the log at runtime! 
 
#general_log_file  = /var/log/mysql/mysql.log 
 
#general_log    = 1 
 
# 
 
# Error log - should be very few entries. 
 
# 
 
log_error = /var/log/mysql/error.log 
 
# 
 
# Here you can see queries with especially long duration 
 
#log_slow_queries \t = /var/log/mysql/mysql-slow.log 
 
#long_query_time = 2 
 
#log-queries-not-using-indexes 
 
# 
 
# The following can be used as easy to replay backup logs or for replication. 
 
# note: if you are setting up a replication slave, see README.Debian about 
 
#  other settings you may need to change. 
 
#server-id \t \t = 1 
 
#log_bin \t \t \t = /var/log/mysql/mysql-bin.log 
 
expire_logs_days \t = 10 
 
max_binlog_size = 100M 
 
#binlog_do_db \t \t = include_database_name 
 
#binlog_ignore_db \t = include_database_name 
 
# 
 
# * InnoDB 
 
# 
 
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. 
 
# Read the manual for more InnoDB related options. There are many! 
 
# 
 
# * Security Features 
 
# 
 
# Read the manual, too, if you want chroot! 
 
# chroot = /var/lib/mysql/ 
 
# 
 
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca". 
 
# 
 
# ssl-ca=/etc/mysql/cacert.pem 
 
# ssl-cert=/etc/mysql/server-cert.pem 
 
# ssl-key=/etc/mysql/server-key.pem

そして、phpMyAdminのための私のconfig.inc.php：

<?php 
 
/** 
 
* Debian local configuration file 
 
* 
 
* This file overrides the settings made by phpMyAdmin interactive setup 
 
* utility. 
 
* 
 
* For example configuration see 
 
* /usr/share/doc/phpmyadmin/examples/config.sample.inc.php 
 
* or 
 
* /usr/share/doc/phpmyadmin/examples/config.manyhosts.inc.php 
 
* 
 
* NOTE: do not add security sensitive data to this file (like passwords) 
 
* unless you really know what you're doing. If you do, any user that can 
 
* run PHP or CGI on your webserver will be able to read them. If you still 
 
* want to do this, make sure to properly secure the access to this file 
 
* (also on the filesystem level). 
 
*/ 
 

 
if (!function_exists('check_file_access')) { 
 
    function check_file_access($path) 
 
    { 
 
     if (is_readable($path)) { 
 
      return true; 
 
     } else { 
 
      error_log(
 
       'phpmyadmin: Failed to load ' . $path 
 
       . ' Check group www-data has read access and open_basedir restrictions.' 
 
      ); 
 
      return false; 
 
     } 
 
    } 
 
} 
 

 
// Load secret generated on postinst 
 
if (check_file_access('/var/lib/phpmyadmin/blowfish_secret.inc.php')) { 
 
    require('/var/lib/phpmyadmin/blowfish_secret.inc.php'); 
 
} 
 

 
// Load autoconf local config 
 
if (check_file_access('/var/lib/phpmyadmin/config.inc.php')) { 
 
    require('/var/lib/phpmyadmin/config.inc.php'); 
 
} 
 

 
/** 
 
* Server(s) configuration 
 
*/ 
 
$i = 0; 
 
// The $cfg['Servers'] array starts with $cfg['Servers'][1]. Do not use $cfg['Servers'][0]. 
 
// You can disable a server config entry by setting host to ''. 
 
$i++; 
 

 
/** 
 
* Read configuration from dbconfig-common 
 
* You can regenerate it using: dpkg-reconfigure -plow phpmyadmin 
 
*/ 
 
if (check_file_access('/etc/phpmyadmin/config-db.php')) { 
 
    require('/etc/phpmyadmin/config-db.php'); 
 
} 
 

 
/* Configure according to dbconfig-common if enabled */ 
 
if (!empty($dbname)) { 
 
    /* Authentication type */ 
 
    $cfg['Servers'][$i]['auth_type'] = 'cookie'; 
 
    /* Server parameters */ 
 
    if (empty($dbserver)) $dbserver = 'localhost'; 
 
    $cfg['Servers'][$i]['host'] = $dbserver; 
 

 
    if (!empty($dbport) || $dbserver != 'localhost') { 
 
     $cfg['Servers'][$i]['connect_type'] = 'tcp'; 
 
     $cfg['Servers'][$i]['port'] = $dbport; 
 
    } 
 
    //$cfg['Servers'][$i]['compress'] = false; 
 
    /* Select mysqli if your server has it */ 
 
    $cfg['Servers'][$i]['extension'] = 'mysqli'; 
 
    /* Optional: User for advanced features */ 
 
    $cfg['Servers'][$i]['controluser'] = $dbuser; 
 
    $cfg['Servers'][$i]['controlpass'] = $dbpass; 
 
    /* Optional: Advanced phpMyAdmin features */ 
 
    $cfg['Servers'][$i]['pmadb'] = $dbname; 
 
    $cfg['Servers'][$i]['bookmarktable'] = 'pma__bookmark'; 
 
    $cfg['Servers'][$i]['relation'] = 'pma__relation'; 
 
    $cfg['Servers'][$i]['table_info'] = 'pma__table_info'; 
 
    $cfg['Servers'][$i]['table_coords'] = 'pma__table_coords'; 
 
    $cfg['Servers'][$i]['pdf_pages'] = 'pma__pdf_pages'; 
 
    $cfg['Servers'][$i]['column_info'] = 'pma__column_info'; 
 
    $cfg['Servers'][$i]['history'] = 'pma__history'; 
 
    $cfg['Servers'][$i]['table_uiprefs'] = 'pma__table_uiprefs'; 
 
    $cfg['Servers'][$i]['tracking'] = 'pma__tracking'; 
 
    $cfg['Servers'][$i]['userconfig'] = 'pma__userconfig'; 
 
    $cfg['Servers'][$i]['recent'] = 'pma__recent'; 
 
    $cfg['Servers'][$i]['favorite'] = 'pma__favorite'; 
 
    $cfg['Servers'][$i]['users'] = 'pma__users'; 
 
    $cfg['Servers'][$i]['usergroups'] = 'pma__usergroups'; 
 
    $cfg['Servers'][$i]['navigationhiding'] = 'pma__navigationhiding'; 
 
    $cfg['Servers'][$i]['savedsearches'] = 'pma__savedsearches'; 
 
    $cfg['Servers'][$i]['central_columns'] = 'pma__central_columns'; 
 
    $cfg['Servers'][$i]['designer_settings'] = 'pma__designer_settings'; 
 
    $cfg['Servers'][$i]['export_templates'] = 'pma__export_templates'; 
 

 
    /* Uncomment the following to enable logging in to passwordless accounts, 
 
    * after taking note of the associated security risks. */ 
 
    // $cfg['Servers'][$i]['AllowNoPassword'] = TRUE; 
 

 
    /* Advance to next server for rest of config */ 
 
    $i++; 
 
} 
 

 
/* Authentication type */ 
 
//$cfg['Servers'][$i]['auth_type'] = 'cookie'; 
 
/* Server parameters */ 
 
//$cfg['Servers'][$i]['host'] = 'localhost'; 
 
//$cfg['Servers'][$i]['connect_type'] = 'tcp'; 
 
//$cfg['Servers'][$i]['compress'] = false; 
 
/* Uncomment the following to enable logging in to passwordless accounts, 
 
* after taking note of the associated security risks. */ 
 
// $cfg['Servers'][$i]['AllowNoPassword'] = TRUE; 
 

 
/** 
 
* phpMyAdmin configuration storage settings. 
 
*/ 
 

 
/* User used to manipulate with storage */ 
 
// $cfg['Servers'][$i]['controlhost'] = ''; 
 
// $cfg['Servers'][$i]['controlport'] = ''; 
 
// $cfg['Servers'][$i]['controluser'] = 'pma'; 
 
// $cfg['Servers'][$i]['controlpass'] = 'pmapass'; 
 

 
/* Storage database and tables */ 
 
// $cfg['Servers'][$i]['pmadb'] = 'phpmyadmin'; 
 
// $cfg['Servers'][$i]['bookmarktable'] = 'pma__bookmark'; 
 
// $cfg['Servers'][$i]['relation'] = 'pma__relation'; 
 
// $cfg['Servers'][$i]['table_info'] = 'pma__table_info'; 
 
// $cfg['Servers'][$i]['table_coords'] = 'pma__table_coords'; 
 
// $cfg['Servers'][$i]['pdf_pages'] = 'pma__pdf_pages'; 
 
// $cfg['Servers'][$i]['column_info'] = 'pma__column_info'; 
 
// $cfg['Servers'][$i]['history'] = 'pma__history'; 
 
// $cfg['Servers'][$i]['table_uiprefs'] = 'pma__table_uiprefs'; 
 
// $cfg['Servers'][$i]['tracking'] = 'pma__tracking'; 
 
// $cfg['Servers'][$i]['userconfig'] = 'pma__userconfig'; 
 
// $cfg['Servers'][$i]['recent'] = 'pma__recent'; 
 
// $cfg['Servers'][$i]['favorite'] = 'pma__favorite'; 
 
// $cfg['Servers'][$i]['users'] = 'pma__users'; 
 
// $cfg['Servers'][$i]['usergroups'] = 'pma__usergroups'; 
 
// $cfg['Servers'][$i]['navigationhiding'] = 'pma__navigationhiding'; 
 
// $cfg['Servers'][$i]['savedsearches'] = 'pma__savedsearches'; 
 
// $cfg['Servers'][$i]['central_columns'] = 'pma__central_columns'; 
 
// $cfg['Servers'][$i]['designer_settings'] = 'pma__designer_settings'; 
 
// $cfg['Servers'][$i]['export_templates'] = 'pma__export_templates'; 
 
/* Contrib/Swekey authentication */ 
 
// $cfg['Servers'][$i]['auth_swekey_config'] = '/etc/swekey-pma.conf'; 
 

 
/* 
 
* End of servers configuration 
 
*/ 
 

 
/* 
 
* Directories for saving/loading files from server 
 
*/ 
 
$cfg['UploadDir'] = ''; 
 
$cfg['SaveDir'] = ''; 
 

 
/* Support additional configurations */ 
 
foreach (glob('/etc/phpmyadmin/conf.d/*.php') as $filename) 
 
{ 
 
    include($filename); 
 
}

そして、私はあなたはArduinoのコードを見てみたいn個の場合は、ここにある：

#include <Ethernet.h> 
 
#include <MySQL_Connection.h> 
 
#include <MySQL_Cursor.h> 
 
#include <avr/pgmspace.h> 
 

 
byte mac_addr[] = { Mac is valid }; 
 
byte ip_addr[] = { 192, 168, 2, 100 }; 
 
byte dns_addr[] = { 192, 168, 2, 1 }; 
 
byte gateway_addr[] = { 192, 168, 2, 1 }; 
 
byte netmask[] = { 255, 255, 255, 0 }; 
 

 
IPAddress server_addr(Yes, the address is correct); // IP of the MySQL *server* here 
 
char user[] = "arduino";    // MySQL user login username 
 
char password[] = "Yes, the password is correct";  // MySQL user login password 
 

 
// Sample query 
 
const char PROGMEM query[] = "UPDATE main.counts SET count=count+1"; 
 

 
EthernetClient client; 
 
MySQL_Connection conn((Client *)&client); 
 

 
void setup() { 
 
    Serial.begin(115200); 
 
    while (!Serial); // wait for serial port to connect 
 
    Ethernet.begin(mac_addr, ip_addr, dns_addr, gateway_addr, netmask); 
 
    Serial.println("Connecting..."); 
 
    if (conn.connect(server_addr, 3306, user, password)) { 
 
    delay(1000); 
 
    } 
 
    else 
 
    Serial.println("Connection failed."); 
 
} 
 

 

 
void loop() { 
 
    delay(2000); 
 
    Serial.println("\nRunning SELECT from PROGMEM and printing results\n"); 
 
    MySQL_Cursor *cur_mem = new MySQL_Cursor(&conn); 
 
    cur_mem->execute(query, true); 
 
    delete cur_mem; 
 
}

（私はこのコードからパスワードやVPSアドレスを削除しました）。

編集：私は、ユーザー「Arduinoのは、」もちろん、あなたが見ることができるように任意のアドレスからログインすることが可能であることも言及する必要があります：

任意のアイデア？ありがとう:)

Answer 1

問題はArduinoコードであった。無駄な情報をたくさん投稿しました。