High-Availability Redis Cluster Solution for NoSQL and Emergency Maintenance Tips: Assuming there is a master-slave setup, where the master has no persistence configured and the slave has AOF enabled. (The master handles backup and write services, while the slave handles read services.) Scenario: What should you do if the master suddenly goes down? www.2cto.com Solution: Connect to the slave and run a save operation …
I happened to notice that Hadoop’s system CPU usage was very high, and a quick search revealed this is actually a known issue. RHEL6 optimized memory allocation efficiency, which significantly improves KVM performance in certain scenarios: http://www.linux-kvm.org/wiki/images/9/9e/2010-forum-thp …
Any domain in operation has at least two DNS servers: a primary (e.g., ns1) and a secondary (e.g., ns2). These are used for failover: if one goes down, the other activates. This guide explains how to configure a primary DNS server on CentOS.
Today, under the immense threat of hacker and virus technologies, and for the security of commercial and policy information, many government agencies, military units, financial and insurance institutions, high-tech enterprises, and large conglomerates have begun implementing tiered management of critical data based on information importance. For example, employees in different positions …
Bandwidth Limiting Commands for Huawei Switches and Cisco Switches: Huawei Switch: sys // Enter system
[LinkIDC-LF-J5]di cu // System
[LinkIDC-LF-J5]int e1/0/2 // Enter port
[LinkIDC-LF-J5-Ethernet1/0/2]int e1/0/3 // Change to port 3
[Link …
With password-based authentication so prevalent, you may need a password management tool. There are various options varying in complexity, UI, and target environment. This article explains how to use pass on the command line.
With password-based authentication so prevalent, you may need a password management tool. There are various options varying in complexity, UI, and target environment. This article explains how to use pass on the command line.
In Linux systems, the top command displays the real-time status of running processes, showing useful information such as CPU utilization, memory consumption, and per-process details. But did you know there's another command-line tool called 'htop' that, unlike the tra…
Applicable Models: All Servers Document Content: IBM RAID controllers can be categorized into three major types based on the hard drives they control: SCSI RAID controllers for SCSI drives: ServeRaid, ServeRaid II, ServeRaid 3L, ServeRaid 3H, ServeRaid 4L, ServeRaid 4Lx, …
Webmin is an open-source, web-based system administration tool for Unix/Linux. With Webmin, you can set up and install all system services directly from your browser, including DNS, DHCP, Apache, NFS, Samba, and more. So, with this tool, you no longer need to remember every configuration modification …
