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### A Detailed Page About PHP Threads: Understanding Multithreading in PHP PHP is one of the most widely used server-side programming languages, primarily known for its ability to generate dynamic web pages and handle requests on web servers. While PHP is designed to be fast and efficient for web development, it traditionally operates on a single-threaded, synchronous model, meaning each request is handled one at a time. This approach is simple, but it can sometimes lead to inefficiencies, particularly when tasks are time-consuming or when there is a need to handle multiple operations simultaneously. In environments where performance is critical or when executing tasks likeRead More →

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In: Database, General

You might receive the error Column count of mysql.user is wrong. Expected 42, found 44. The table is probably corrupted , this is probably because you import the whole database from mysql 5.6 to 5.7 . The table structure has changed , so you need to update it. You can use the command mysql_upgrade to do this work for you. After you import the data , run this file mysql_upgrade -uroot -p -h127.0.0.1 -P3306   this command will go all over your databases table and upgrade the database structure . mysql.tables_priv OK mysql.time_zone OK mysql.time_zone_leap_second OK mysql.time_zone_name OK mysql.time_zone_transition OK mysql.time_zone_transition_type OK mysql.user OK UpgradingRead More →

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In: General, Phone

I had a samsung J7, it’s in the drawer for many months. today i tried to charge it, there was no sign it’s charging. i changed many cables , i thought the battery is dead. Luckily i have its original charger adapter + cable , i connected it to the phone , the phone starts up . i don’t know if there is any difference between the original charger and other compatible charger. Hope it help you in some cases.Read More →

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In: General, Linux

rrdtool dump filename.rrd rrdtool info filename.rrd   rrdtool graph /dev/null -s 3600 DEF:ierr=filename.rrd:ds1:AVERAGE VDEF:ioct_a=ierr,AVERAGE PRINT:ierr:%lf this command will get the avg value of ds1 (ds1 is the dataset – you can see it in rrdtool info )  , assign it to variable ierr  and print out #3600 => one hourRead More →

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Create a service: sudo vi /etc/systemd/system/rc-local.service Add your code there: [Unit] Description=/etc/rc.local Compatibility ConditionPathExists=/etc/rc.local [Service] Type=forking ExecStart=/etc/rc.local start TimeoutSec=0 StandardOutput=tty RemainAfterExit=yes SysVStartPriority=99 [Install] WantedBy=multi-user.target Create and make sure /etc/rc.local is executable and add this code inside it: sudo chmod +x /etc/rc.local #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will “exit 0” on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. exit 0 Enable the service: sudoRead More →

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My Strongswan : Local IP: 172.30.0.37 Elastic IP: 19.215.188.2 OS: Ubuntu My WAN: – Customer grade broadband Internet – Public IP:28.77.250.17 – connect to my fiber optics – Local gateway IP: 192.168.1.100 – we need to setup porftforwarding : UDP port 4500,500, to our router interface 192.16.1.108 My Cisco: – Cisco 1841 – fa0/1 : 192.168.1.108  – connect to My WAN router local interface – fa0/0: 172.16.8.254 – connect to my local switch / pc My Strongswan config: /etc/ipsec.conf config setup # strictcrlpolicy=yes # uniqueids = no conn %default ikelifetime=1440m keylife=60m rekeymargin=3m keyingtries=1 keyexchange=ikev1 authby=secret conn myremoteoffice left=172.30.0.37 #strongswan outside address leftsubnet=172.30.0.0/24,0.0.0.0/0 #network behind strongswanRead More →

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In: General, Networking

i have 2 sites vpn between Strongswan and Cisco 1841 , the vpn works well , but there is a problem , some of ssl website could not open , after some research it turned out that’s the mtu issue. this is how i fix: conf t int fa0/1 ip mtu 1500 int fa0/0 ip mtu 1500 In case of yahoo, i need to update this on strongswan server: $ iptables -t mangle -A FORWARD -o eth0 \ -p tcp -m tcp –tcp-flags SYN,RST SYN \ -m tcpmss –mss 1361:1536 \ -j TCPMSS –set-mss 1360 $ echo 1 >/proc/sys/net/ipv4/ip_no_pmtu_disc For your reference: MTU woes inRead More →

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In: General, Programming

#add this line in Type 3 – ^${VLAN}\s+${DESTINATION_ADDRESS}\s+${TYPE}\s+\S+\s+${DESTINATION_PORT} -> Record Value DESTINATION_ADDRESS (\w+.\w+.\w+) Value TYPE (\w+) Value VLAN (\w+) Value DESTINATION_PORT (\S+) Start ^Destination\s+Address\s+Address\s+Type\s+VLAN\s+Destination\s+Port -> TYPE1 ^\s+vlan\s+mac address\s+type\s+learn\s+age\s+ports -> TYPE2 ^\s+vlan\s+mac address\s+type\s+protocols\s+port -> TYPE3 ^Vlan\s+Mac Address\s+Type\s+Ports -> TYPE4 TYPE1 ^${DESTINATION_ADDRESS}\s+${TYPE}\s+${VLAN}\s+${DESTINATION_PORT} -> Record TYPE2 ^[\*|\s]\s+${VLAN}\s+${DESTINATION_ADDRESS}\s+${TYPE}\s+\S+\s+\S+\s+${DESTINATION_PORT} -> Record TYPE3 ^\s+${VLAN}\s+${DESTINATION_ADDRESS}\s+${TYPE}\s+\S+\s+${DESTINATION_PORT} -> Record ^${VLAN}\s+${DESTINATION_ADDRESS}\s+${TYPE}\s+\S+\s+${DESTINATION_PORT} -> Record TYPE4 ^\s+${VLAN}\s+${DESTINATION_ADDRESS}\s+${TYPE}\s+${DESTINATION_PORT} -> Record  Read More →