1. top command The top command gives real-time information about the running processes as well as a summary of system information. It displays uptime, load averages, CPU…
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Tag: linux
How to troubleshoot high memory usage in linux
There are situations where your server shows unintended behaviors like a slow response from websites, failures with services, inability to start applications, server crashes etc.…
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Understanding IOPS vs. throughput
Input/output operations per second (IOPS) and data throughput are two popular performance characteristics of any storage system. In the early days of computer technology, when…
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MySQL login root without password in Linux
to add more users just add more user and password in ~/.my.cnf
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How to Configure Virtual IP Address (VIP) on CentOS
As its name suggests, Virtual IP address (VIP) is an IP address that doesn’t have an actual physical network interface. Incoming packets are sent to…
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Adding postgres as SUDOERS in centos
Login as root: :wq!
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How to Configure and Use PAM in Linux
Linux-PAM (short for Pluggable Authentication Modules which evolved from the Unix-PAM architecture) is a powerful suite of shared libraries used to dynamically authenticate a user to applications (or…
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Docker linux add sudoers, alias commit image
at docker cli with root user: #apt-get install sudo #usermod -aG sudo postgres #su – postgres postgres # sudo whoami Permanent Alias vim ~/.bashrc or…
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RHEL 8 / CentOS 8 firewall commands
systemctl status firewalld systemctl stop firewalld systemctl disable firewalld systemctl start firewalld systemctl enable firewalld
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