SMASHING LAB

The program iptablesis the firewall, which is installed by default on most Linux distributions, including CentOS. Sometimes you need to stop iptablesto troubleshoot network-related problems. Also, if there is a problem with the newly installed program – in the appropriate forums you can find an advice to temporarily stop the firewall to check whether the program will work without it. From this article, you will learn how to check the current status of the firewall iptablesand how to turn it off or turn it on in CentOS. Privileges: The following commands must be executed with rootprivileges. Iptables: Check Status Good advice: Disconnected iptables, and the necessary program… [Read More]

SELinux is an access control program that is installed and activated by default on Linux distributions such as RHEL (Red Hat Enterprise Linux), CentOS, and Fedora. If you installed a new system or installed a new application and it did not work, then you need to test SELinux, as it is likely that it could be the cause of this problem. From this article, you will learn how to check the current status of SELinux, how to disable or enable SELinux temporarily or permanently. Check SELinux Status Run the following command to see if SELinux is running :

getenforceinforms in what standing is SELinux: Enforcing (on), Permissive (included in notification mode), or Disabled (disabled). Temporarily Disable SELinux The following changes are temporary and will be lost… [Read More]

Typically, log rotation in Linux occurs daily on the cron. The default configuration file is /etc/logrotate.conf, and the individual log rotation rules for the services are stored in the directory /etc/logrotate.d. Sometimes it becomes necessary to manually rotate certain files. For example, if you have high traffic server, you need to rotate logs before its default said frequency to avoid bulky files. In this article, you will learn how to debug and force logrotate manual start. Tip: All you need to know about crontab: setting up cron in Ubuntu and CentOS, examples crontabin Linux, running cron jobs (scripts, commands) every minute, every hour, every… [Read More]

In Linux, we can configure the execution of a regular task, also known as a cron job , using the service cron crond. Service cron crond, reads crontab(cron-a table) and executes scheduled tasks. In this article I will show the formatcrontaband explain how to schedule the launch of commands or scripts in Linux. You will also find here such common examples of schedules in crontab, like running a command or script every minute , every 5 minutes , every hour, every day and many others. The first step is to make sure that the service cron crond is started. Find out if the service is running cronin Ubuntu :

– or –

Find out if the service is running crondin CentOS :

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Git is a version control system (SCR) that allows you to track changes in a project over time. Git records all the changes that you made in the project, stores information about these changes and allows you to use this information. From this article, you will learn about the standard workflow using Git, as well as the basic commands in Git for daily use. Standard Workflow with Git The standard workflow using Git looks like this: After creating the Git Repository, all the work is done in the Working Directory When your work reaches an important mark (for example, you fixed a bug or ended the workday), you… [Read More]

Performance of PHP is greatly increased in the version 7.0 and support for the older version will be ended in newer future. So it is now critical to update your PHP version. But at the same point, there are applications of environment that demand older version of PHP. You may need to run several versions of PHP under one apache server. I looked at the various options and I was given the launch of the old version of PHP 5.6 via FastCGI. So, I already have the Apache server installed and PHP 7.0 installed. Let’s start with downloading and building PHP… [Read More]