Here is a procedure to create ramdisk on Linux. 1. Look for ramdisk devices : ls -la /dev/ram* 2. Increase size by adding the kernel parameter in the grub config file (this example assume you want a 512 Mb ramdisk) : ramdisk_size=512000 3. Format the ramdisk : mke2fs -m 0 /dev/ram0 4. Mount the ramdisk… Read More »
Use this very simple command to test the performance of a remote Linux/Unix server : iperf -i 1 -t 3 -c 0.0.0.0 (replace 0.0.0.0 with the target IP address)
Using SPF record restrict the hosts allowed to send message on your behalf. If you are using Blackberry device, all your e-mail are relayed through RIM servers. So to make delivery successful, you need to allow their servers. Add the following to your DNS text string to allow RIM servers to send out e-mails with… Read More »
If you see those dmesg output message, this mean that someone is attacking your server. Probably by sending fragmented packets. TCP: Treason uncloaked! Peer 0.0.0.0:00000/80 shrinks window 76154906:76154907. Repaired. This may be avoid by manually blocking this IP in IPtables or if this is a DDoS attack, automated script may be used. See above (use with… Read More »
Here is a quick how to block a specific IP address with the IPtables Linux firewall. Open the IPtables script : vi /etc/sysconfig/iptables To block INBOUND IP address, add the following : iptables -A INPUT -s 0.0.0.0 -j DROP To block OUTBOUND IP address : iptables -A OUTPUT -p tcp -d 0.0.0.0 -j DROP (replace… Read More »
Getting this error with Joomla CMS? Warning: Memcache::addserver() expects parameter 2 to be long, string given in /joomla/libraries/joomla/cache/storage/memcache.php on line 83 Change the server port to 0 backend–> Configuration –> System In Port: change value the value 0