Install Zabbix with network monitoring

Install Zabbix server with tutorial for your operating system (google it).
Install zabbix-agent and network monitoring script:

For Debian 9 agents:

apt-get install zabbix-agent vnstat bc unzip zip dos2unix -y && vnstat -u -i ens3 && mkdir /etc/zabbix/script && cd /etc/zabbix/script && wget && unzip && chmod +x * && dos2unix *.sh && wget && mv text /etc/zabbix/zabbix_agentd.conf && nano /etc/zabbix/zabbix_agentd.conf

Edit Hostname, Server and ServerActive:


Restart agent:

systemctl restart zabbix-agent


* * * * * sh /etc/zabbix/script/

Network monitoring plugin for Zabbix server GUI:

Set/change PHP version command [Ubuntu/Debian]

Command to change PHP version in system and Apache2 with multiple PHP versions installed (from )


if [ -z "$1" ]
        echo 'PHP version required'
        if test -f "/usr/bin/php"$1; then
                sudo a2dismod php7.0 > /dev/null
                sudo a2dismod php7.1 > /dev/null
                sudo a2dismod php7.2 > /dev/null
                sudo a2dismod php7.3 > /dev/null
                sudo a2dismod php7.4 > /dev/null
                sudo a2enmod php$1 > /dev/null
                systemctl restart apache2

                sudo ln -fs /usr/bin/php$1 /etc/alternatives/php
                sudo ln -fs /usr/bin/php-config$1 /etc/alternatives/php-config
                sudo ln -fs /usr/bin/phpdbg$1 /etc/alternatives/phpdbg
                sudo ln -fs /usr/bin/phpize$1 /etc/alternatives/phpize
                sudo ln -fs /usr/bin/phar$1 /etc/alternatives/phar
                sudo ln -fs /usr/bin/phar.phar$1 /etc/alternatives/phar.phar
                echo 'Changed PHP version to: '$1
                echo 'Wrong PHP version: '$1

OTS Restarter script with console logs with timestamp and binary file copy (for GDB)

ulimit -c unlimited
while true; do

 cp kasteria bins/kasteria_`date '+%Y-%m-%d_%H-%M'`_`crc32 kasteria`
 stdbuf -o 0 ./kasteria 2>&1 | ts '%Y-%m-%d_%H-%M-%.S' | tee -a 'console/console_'`date '+%Y-%m-%d'`'.log';

 sleep 3


Fast configure multiple PHP versions php.ini

Script to configure PHP variables for development environment.


$phpDir = '/etc/php';

$backupPath = __DIR__ . DIRECTORY_SEPARATOR . 'config_backup.' . date('Y-m-d_H-i-s') . '.zip';
echo 'Backup config file: ' . $backupPath . PHP_EOL;
system('zip -r ' . $backupPath . ' ' . $phpDir . ' > /dev/null');
chmod($backupPath, 0777);

$values = [
	'upload_max_filesize' => '256M',
	'post_max_size' => '256M',
	'max_file_uploads' => 100,
	'memory_limit' => '1024M',
	'max_execution_time' => 15,
	'error_reporting' => 'E_ALL & ~E_DEPRECATED & ~E_STRICT',
	'display_errors' => 'Off',
	'log_errors' => 'On',
	'xdebug.remote_enable' => '1',
setPhpConfigValues($values, $phpDir, ['5.6', '7.0', '7.1', '7.2', '7.3'], ['apache2', 'fpm']);

$values = [
	'memory_limit' => -1,
	'max_execution_time' => 0,
	'error_reporting' => 'E_ALL & ~E_DEPRECATED & ~E_STRICT',
	'display_errors' => 'On',
	'log_errors' => 'Off',
setPhpConfigValues($values, $phpDir, ['5.6', '7.0', '7.1', '7.2', '7.3'], ['cli']);

system('systemctl restart apache2');
foreach(['5.6', '7.0', '7.1', '7.2', '7.3'] as $version) {
	system('systemctl restart php' . $version . '-fpm');

function setPhpConfigValues($values, $phpDir, $phpVersions, $phpTypes)
	foreach($phpVersions as $phpVersion) {
		foreach($phpTypes as $phpType) {
			$filePath = $phpDir . DIRECTORY_SEPARATOR . $phpVersion . DIRECTORY_SEPARATOR . $phpType . DIRECTORY_SEPARATOR . 'php.ini';
			if (file_exists($filePath)) {
				if (is_readable($filePath)) {
					if (is_writable($filePath)) {
						$lines = file($filePath);
						echo 'FILE: ' . $filePath . PHP_EOL;
						foreach($values as $searchKey => $newValue) {
							foreach($lines as $line => $text) {
								if (substr_count($text, '=') > 0) {
									list($lineKey, $lineValue) = explode('=', $text, 2);

									if (strpos($lineKey, $searchKey) !== false) {
										if (trim($lineValue) != $newValue) {
											echo 'Change key "' . $searchKey . '" value from "' . trim($lineValue) . '" to "' . $newValue . '"' . PHP_EOL;
											$lines[$line] = $searchKey . ' = ' . $newValue . PHP_EOL;
										continue 2;

							echo 'Add key "' . $searchKey . '" with value"' . $newValue . '"' . PHP_EOL;
							$lines[] = $searchKey . ' = ' . $newValue . PHP_EOL;
						file_put_contents($filePath, implode('', $lines));
						echo 'SAVE FILE: ' . $filePath . PHP_EOL;
					} else {
						echo 'Config file not writable: ' . $filePath . PHP_EOL;
				} else {
					echo 'Config file not readable: ' . $filePath . PHP_EOL;
			} else {
				echo 'Config file not found: ' . $filePath . PHP_EOL;

Linux Mint 19 – PHP/MariaDB dev env v1

apt install htop screen screenie mc nano tcpdump vim mariadb-server mariadb-client sshfs filezilla dbeaver-ce postgresql wireshark

Hasło do konta 'root' MariaDB ustawić na 'root'.

UPDATE mysql.user SET plugin = '', host = '%';
flush privileges;
SET PASSWORD FOR 'root'@'%' = PASSWORD('root');
flush privileges;

add-apt-repository ppa:ondrej/php
add-apt-repository ppa:ondrej/apache2
apt update

apt install apache2

apt install php5.6 php5.6-fpm php5.6-bcmath php5.6-bz2 php5.6-calendar php5.6-cli php5.6-common php5.6-ctype php5.6-curl php5.6-dba php5.6-dev php5.6-dom php5.6-exif php5.6-fileinfo php5.6-gd php5.6-gettext php5.6-gmp php5.6-iconv php5.6-imagick php5.6-intl php5.6-json php5.6-ldap php5.6-mailparse php5.6-mbstring php5.6-mongodb php5.6-mysql php5.6-mysqli php5.6-mysqlnd php5.6-oauth php5.6-odbc php5.6-opcache php5.6-pdo php5.6-pdo-dblib php5.6-pdo-mysql php5.6-pdo-odbc php5.6-pdo-pgsql php5.6-pdo-sqlite php5.6-pgsql php5.6-phar php5.6-phpdbg php5.6-posix php5.6-radius php5.6-readline php5.6-redis php5.6-simplexml php5.6-smbclient php5.6-soap php5.6-sockets php5.6-solr php5.6-sqlite3 php5.6-ssh2 php5.6-sybase php5.6-tokenizer php5.6-uploadprogress php5.6-uuid php5.6-xdebug php5.6-xml php5.6-xmlreader php5.6-xmlrpc php5.6-xmlwriter php5.6-yaml php5.6-zip

apt install php7.0 php7.0-fpm php7.0-bcmath php7.0-bz2 php7.0-calendar php7.0-cli php7.0-common php7.0-ctype php7.0-curl php7.0-dba php7.0-dev php7.0-dom php7.0-exif php7.0-fileinfo php7.0-gd php7.0-gettext php7.0-gmp php7.0-http php7.0-iconv php7.0-imagick php7.0-intl php7.0-json php7.0-ldap php7.0-mailparse php7.0-mbstring php7.0-mongodb php7.0-mysql php7.0-mysqli php7.0-mysqlnd php7.0-oauth php7.0-odbc php7.0-opcache php7.0-pdo php7.0-pdo-dblib php7.0-pdo-mysql php7.0-pdo-odbc php7.0-pdo-pgsql php7.0-pdo-sqlite php7.0-pgsql php7.0-phar php7.0-phpdbg php7.0-posix php7.0-radius php7.0-readline php7.0-redis php7.0-simplexml php7.0-smbclient php7.0-soap php7.0-sockets php7.0-solr php7.0-sqlite3 php7.0-ssh2 php7.0-sybase php7.0-tokenizer php7.0-uploadprogress php7.0-uuid php7.0-xdebug php7.0-xml php7.0-xmlreader php7.0-xmlrpc php7.0-xmlwriter php7.0-yaml php7.0-zip

apt install php7.1 php7.1-fpm php7.1-bcmath php7.1-bz2 php7.1-calendar php7.1-cli php7.1-common php7.1-ctype php7.1-curl php7.1-dba php7.1-dev php7.1-dom php7.1-exif php7.1-fileinfo php7.1-gd php7.1-gettext php7.1-gmp php7.1-http php7.1-iconv php7.1-imagick php7.1-intl php7.1-json php7.1-ldap php7.1-mailparse php7.1-mbstring php7.1-mongodb php7.1-mysql php7.1-mysqli php7.1-mysqlnd php7.1-oauth php7.1-odbc php7.1-opcache php7.1-pdo php7.1-pdo-dblib php7.1-pdo-mysql php7.1-pdo-odbc php7.1-pdo-pgsql php7.1-pdo-sqlite php7.1-pgsql php7.1-phar php7.1-phpdbg php7.1-posix php7.1-radius php7.1-readline php7.1-redis php7.1-simplexml php7.1-smbclient php7.1-soap php7.1-sockets php7.1-solr php7.1-sqlite3 php7.1-ssh2 php7.1-sybase php7.1-tokenizer php7.1-uploadprogress php7.1-uuid php7.1-xdebug php7.1-xml php7.1-xmlreader php7.1-xmlrpc php7.1-xmlwriter php7.1-yaml php7.1-zip

apt install php7.2 php7.2-fpm php7.2-bcmath php7.2-bz2 php7.2-calendar php7.2-cli php7.2-common php7.2-ctype php7.2-curl php7.2-dba php7.2-dev php7.2-dom php7.2-exif php7.2-fileinfo php7.2-gd php7.2-gettext php7.2-gmp php7.2-http php7.2-iconv php7.2-imagick php7.2-intl php7.2-json php7.2-ldap php7.2-mailparse php7.2-mbstring php7.2-mongodb php7.2-mysql php7.2-mysqli php7.2-mysqlnd php7.2-oauth php7.2-odbc php7.2-opcache php7.2-pdo php7.2-pdo-dblib php7.2-pdo-mysql php7.2-pdo-odbc php7.2-pdo-pgsql php7.2-pdo-sqlite php7.2-pgsql php7.2-phar php7.2-phpdbg php7.2-posix php7.2-radius php7.2-readline php7.2-redis php7.2-simplexml php7.2-smbclient php7.2-soap php7.2-sockets php7.2-solr php7.2-sqlite3 php7.2-ssh2 php7.2-sybase php7.2-tokenizer php7.2-uploadprogress php7.2-uuid php7.2-xdebug php7.2-xml php7.2-xmlreader php7.2-xmlrpc php7.2-xmlwriter php7.2-yaml php7.2-zip

apt install php7.3 php7.3-fpm php7.3-bcmath php7.3-bz2 php7.3-calendar php7.3-cli php7.3-common php7.3-ctype php7.3-curl php7.3-dba php7.3-dev php7.3-dom php7.3-exif php7.3-fileinfo php7.3-gd php7.3-gettext php7.3-gmp php7.3-http php7.3-iconv php7.3-imagick php7.3-intl php7.3-json php7.3-ldap php7.3-mailparse php7.3-mbstring php7.3-mongodb php7.3-mysql php7.3-mysqli php7.3-mysqlnd php7.3-oauth php7.3-odbc php7.3-opcache php7.3-pdo php7.3-pdo-dblib php7.3-pdo-mysql php7.3-pdo-odbc php7.3-pdo-pgsql php7.3-pdo-sqlite php7.3-pgsql php7.3-phar php7.3-phpdbg php7.3-posix php7.3-radius php7.3-readline php7.3-redis php7.3-simplexml php7.3-smbclient php7.3-soap php7.3-sockets php7.3-solr php7.3-sqlite3 php7.3-ssh2 php7.3-sybase php7.3-tokenizer php7.3-uploadprogress php7.3-uuid php7.3-xdebug php7.3-xml php7.3-xmlreader php7.3-xmlrpc php7.3-xmlwriter php7.3-yaml php7.3-zip

wyłączyć 'raphf' w PHP 5.6 (crashuje PHPa, a jest zaciągane razem z którąś z paczek)
rm /etc/php/5.6/cli/conf.d/20-raphf.ini /etc/php/5.6/fpm/conf.d/20-raphf.ini /etc/php/5.6/phpdbg/conf.d/20-raphf.ini
wyłączyć 'propro' i 'http', mają zależności do 'raphf' w PHP 5.6

a2enmod proxy
a2enmod proxy_fcgi

zmienić konfig PHPa:


upload_max_filesize = 128M
post_max_size = 256M
memory_limit = 1024M
max_execution_time = 0

systemctl restart php5.6-fpm php7.0-fpm php7.1-fpm php7.2-fpm php7.3-fpm

a2enconf php5.6-fpm php7.0-fpm php7.1-fpm php7.2-fpm php7.3-fpm

// konfig domen domyslny wywalic, dodac konfig dla domen php**

<VirtualHost *:80>

        DocumentRoot /home/jskalski/p/

        <FilesMatch \.php$>
                SetHandler "proxy:unix:/var/run/php/php5.6-fpm.sock|fcgi://localhost/"

        ErrorLog ${APACHE_LOG_DIR}/error_56.log
        CustomLog ${APACHE_LOG_DIR}/access_56.log combined

systemctl restart apache2

MySQL dump examples

Dump database to file with date in name:

mysqldump -u USERNAME -pSECRETPASSWORD --single-transaction --quick --lock-tables=false DBNAME_HERE > /home/backup/mysql/DBNAME_HERE_`date "+%Y-%m-%d-%H-%M"`.sql

Crontab version: dump every hour at minute 5

5 * * * * mysqldump -u USERNAME -pSECRETPASSWORD --single-transaction --quick --lock-tables=false DBNAME_HERE > /home/backup/mysql/DBNAME_HERE_`date "+\%Y-\%m-\%d-\%H-\%M"`.sql

Keep 2 folders synchronized

Code to copy all changes from one folder to another. I use it to copy changes from my local folder to development server mounted by SSHFS.

In example files are filtered. Only *.cpp and *.h files are copied.

while inotifywait -e modify,create,delete "/home/jskalski/p/prv/otserv/"; do
    rsync -zvur --include="*.cpp" --include="*.h" --exclude="*" "/home/jskalski/p/prv/otserv/" "/mnt/devserver/home/js/otserv/"

Limit number of connections per IP

Limit number of incoming concurrent connections per IP to 1.

On all ports and IPs of server:

iptables -t filter -I INPUT -p tcp -j ACCEPT
iptables -t filter -I INPUT -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -t filter -I INPUT -p tcp --syn -m connlimit --connlimit-above 1 --connlimit-mask 32 -j DROP

On port 80 of server:

iptables -t filter -I INPUT -p tcp --dport 80 -j ACCEPT
iptables -t filter -I INPUT -p tcp --dport 80 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -t filter -I INPUT -p tcp --syn --dport 80 -m connlimit --connlimit-above 1 --connlimit-mask 32 -j DROP

On port 80 and IP of server (in case when server has more IPs):

iptables -t filter -I INPUT -p tcp -d --dport 80 -j ACCEPT
iptables -t filter -I INPUT -p tcp -d --dport 80 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -t filter -I INPUT -p tcp --syn -d --dport 80 -m connlimit --connlimit-above 1 --connlimit-mask 32 -j DROP

Find newest files in directory (recursively)

List files from oldest to newest, recursively.

find . -type f -print0 | xargs -0 stat --format '%Y :%y %n' | sort -n |  awk '{print strftime("%Y-%m-%d %H:%M:%S", $1), $5}' | tail --lines=50


2019-04-19 12:21:31 ./klientotc/modules/gamelib/ui/uiminimap.lua
2019-04-19 15:04:22 ./klientotc/modules/game_hotkeys/hotkeys_manager.otui
2019-04-19 15:11:36 ./klientotc/modules/game_hotkeys/hotkeys_manager.lua
2019-04-19 16:18:34 ./klientotc/.git/index
2019-04-19 16:18:34 ./klientotc/modules/corelib/ui/uiminiwindowcontainer.lua
2019-04-19 16:33:01 ./klientotc/modules/corelib/ui/uiminiwindow.lua
2019-04-19 17:15:50 ./
2019-04-23 07:35:34 ./klientotc/Kasteria.log
2019-04-25 07:25:25 ./klientotc/.idea/workspace.xml
2019-04-26 10:26:27 ./source/.idea/workspace.xml