Server Management Blog
Welcome to Our Blog
At iServerSupport, we understand the challenges that come with managing servers, whether they’re in the cloud, virtualized, or self-hosted. Our blog is here to provide you with practical insights, expert advice, and the latest trends in server management.
From troubleshooting server performance issues to optimizing cloud resources and ensuring top-notch security, our goal is to empower businesses and developers to navigate the complexities of server environments with confidence.
Whether you’re looking for quick fixes, detailed guides, or industry news, you’ll find valuable content tailored to your needs. Dive in, explore, and let us help you keep your servers running smoothly, securely, and efficiently.
Your servers, simplified – the iServerSupport way.
Change Mail Server or Qmail ip in Plesk
SSH in to your server console and let’s look at your setup: # /sbin/ip route 1.2.3.4/1 dev eth0 proto kernel scope link src 1.1.1.1 1.2.3.4/16 dev eth0 scope link default via 3.3.3.3 dev eth0 To [...]
How to Block or Prevent SYN Floods Attack
Hardening your TCP/IP Stack Against SYN Floods Denial of service (DoS) attacks launch via SYN floods can be very problematic for servers that are not properly configured to handle them. Proper firewall filtering policies are [...]
Linux High Cached Memory Usage
sync; echo 3 > /proc/sys/vm/drop_caches echo "vm.drop_caches = 3" >> /etc/sysctl.conf" sync Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free. To [...]
Too Many Connections in TIME_WAIT State
Applications that handle a huge number of TCP connections, either as a server, or as a client, will often see a large number of sockets in TIME_WAIT state. The sockets in TIME_WAIT can be seen [...]
Configure SPF and DKIM for Google Apps
Configure SPF for Google Apps Sender Policy Framework (SPF) is an email-validation system used to prevent spam or spoofed emails from coming into your inbox. SPF is a TXT record just like the A, CNAME, [...]
Install Varnish on cPanel Server
1. Installing varnish and packages: If you are on Centos 5 or a compatible distribution, use rpm --nosignature -i http://repo.varnish-cache.org/redhat/varnish-3.0/el5/noarch/varnish-release/varnish-release-3.0-1.el5.centos.noarch.rpm For Centos 6 and compatible distributions, use rpm --nosignature -i http://repo.varnish-cache.org/redhat/varnish-3.0/el6/noarch/varnish-release/varnish-release-3.0-1.el6.noarch.rpm and then run [...]
Find What is Consuming more Memory in Linux Server
Find what is consuming more memory in linux ps axu | awk '{print $2, $3, $4, $11}' | head -1 && ps axu | awk '{print $2, $3, $4, $11}' | sort -k3 -nr |head [...]
Getting Blank RKhunter Scan Result Emails.
Getting Blank RKhunter Scan Result Emails: Rkhunter (Rootkit Hunter) is an open source Unix/Linux based scanner tool for Linux systems released under GPL that scans backdoors, rootkits and local exploits on your systems. It scans [...]