session_set_save_handler(“open”, “close”, “read”, “write”, “destroy”, “gc”); function read($id) { //if we can’t find the data for this session, we must return ” (empty string) , can’t return false return ”; }Read More →
This is mostly because the script is hang at some point , the server still keeps the connection, this will end up where server can’t accept new connection. This is a dirty approach – it will kill all process having waiting time > 30s #/bin/bash #Delete all apache having process with waiting time >30s GetAllWorkers() { AllWorkers=$(apache2ctl fullstatus | grep ” W ” | awk ‘$6>30 {print $2}’) for PID in $AllWorkers; do echo stopping $PID with SIGTERM kill -9 $PID done } GetAllWorkersRead More →
You can run this command:Read More →
mcrypt extension is an interface to the mcrypt cryptography library. mcrypt is included in php5 to php7.1 , but it’s removed from php7.2 . The instructions below help you install mcrypt for php7.2 on Ubuntu. when you are shown the prompt: hit Enter once installed , you need to create a configuration file for itRead More →
git clone https://github.com/commx/python-rrdtool.git -c http.sslVerify=falseRead More →
if you use#! /bin/zsh $MYVAR=”Hello world” if [[ $MYVAR == *”hello”*]] thenecho “FOUND”fi If we don’t use #! /bin/zsh $MYVAR=”Hello world”if [[ $MYVAR == *”hello”*]]; thenecho “FOUND”fiRead More →
When i try to remove a disk in Virtualbox with this command: I got the following error And the fix is:Read More →
Please check if your subdomain is a CNAME , the DNS rule does not allow CNAME record to have other record. The fix is to use A record for your sub domain – this could be hard if you are using some cloud service like aws.Read More →
rrdcached is a daemon that receives updates to existing RRD files, accumulates them and, if enough have been received or a defined time has passed, writes the updates to the RRD file. A flush command may be used to force writing of values to disk, so that graphing facilities and similar can work with up-to-date data. rrdcached uses the line protocol to communicate with client. When we start rrdcached , it will listen on port 42217 and create a socket file. We can telnet to port 42217 or use ncat to create a connection to socket file. telnet localhost 42217 or nc -U /var/run/rrdcached/rrdcached.sock AfterRead More →
### 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 →