Linux Iptables: Add / Delete An IP Address Remotely Using A Shell Script

Posted on in Categories , , , , , , , , last updated October 22, 2009

I’ve root ssh access and need to add / delete a few IP address on fly using the IPtables command via local shell script. How do I add or delete an IP address remotely over the SSH session under CentOS / Redhat / RHEL / Debian / Ubuntu Linux?

Linux Tuning The VM (memory) Subsystem

Posted on in Categories , , , , , , , , last updated October 16, 2009

I‘ve fast RAID-10 disk subsystem with multiple SCSI disks. Apps running under modern Linux kernel don’t write directly to the disk. They write it to the file system cache which is managed by Linux kernel virtual memory manager. Since I’ve high performance RAID controller I need to decrease the number of flushes. How do I tune virtual memory subsystem under Linux operating systems for better performance?