I. Nagios Introduction Nagios is an open-source computer system and network monitoring tool that can effectively monitor the status of Windows, Linux, and Unix hosts, network devices such as switches and routers, printers, and more. It sends email or SMS alerts immediately when system or service anomalies occur, notifying website operations personnel, and sends normal recovery notifications when the state is restored.
How to Set Up Two-Way Real-Time File Sync Between Linux Servers
In a project requiring real-time file synchronization between two machines, we tried the following two methods:
Project requirement: Machine A (190) and Machine B (217) need to keep a folder’s contents identical to each other. Both Machine A and Machine B might receive files independently and must sync them to the other side.
Method 1: Using rsync-serve …
Due to increasing user numbers, I implemented scalable, highly reliable cluster deployment (LVS+Keepalived). However, users still reported slow access. The root cause was the NFS shared storage server.
LVS+Keepalived. Why use load balancing? 1. System high availability 2. System scalability 3. Load balancing capability. LVS+Keepalived perfectly achieves these requirements.
1. Required packages for NFS installation; Need nfs-utils and rpcbind; 2. Use the following commands to check if the above packages are already installed on the system: rpm -qa|grep nfs; rpm -qa|grep rpcbind; If already installed, proceed directly to step 3; if not …
[LVS] Using clustering technology and the Linux operating system to build a high-performance, high-availability server with excellent scalability, reliability, and manageability.
LVS features include:
1. Strong load resistance, operating above Layer 4 of the network only …
I. Starting Heartbeat 1. Start Heartbeat on the Primary Node After Heartbeat installation completes, a startup script file heartbeat is automatically generated in the /etc/init.d directory. Running /etc/init.d/heartbeat directly shows the usage of the heartbeat script, as shown below: [root@node1 ~]# /e …
The current trend in website development is to use different network load balancing technologies at different stages as the website scales up:
One approach is to use hardware. Common hardware includes relatively expensive commercial load balancers like NetScaler, F5, Radware, and Array …
Varnish is a powerful reverse proxy acceleration software. This article covers installation and configuration on CentOS.
1. Sync
1. Rsync:
yum install rsync
tar zxvf rsync-3.0.7.tar.gz
cd rsync-3.0.7
./configure –prefix=/usr/local/rsync
&make &&make install
rsync server 192.168.1.103
uid = no …
