Check Dedicated Server Specifications | check raid

This post explains few quick linux commands to check server specifications. I tried to explain every command output in this post as follows:

Check SSD

# cat /sys/block/sda/queue/rotational

if above commnad returns 1 it means HDD else if it returns 0 then it is SSD.


Check RAM

# cat /proc/meminfo

MemTotal: 131778740 kB

Above command returns huge list of outputs, however you can ignore all and should focus on 1st line which tells about total Memory. You can convert KBs to MBs at google in order to get values in MBs.

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Remove IPtables rules from rescue system

Hey, this article explains how you can remove IPtables rules if they are blocking access to the server. This usually happens if you wrongly configured IPtables or got any port blocked mistakenly like SSH port. Following the below steps to get it fixed.

Operating System : These steps are tested on Centos 6, however not tested on other operating systems.


  1. Boot your server into rescue system. (If you cannot boot it you can ask your server provider to do this for you.)
  2. Login to rescue system via SSH and then:
    1. List hard disk partitions:
      1. run:
      2. # fdisk -l
      3. Output will be like:
      4. Device    Boot     Start       End    Blocks  Id System/dev/sda1 *         2048   1026047    512000  83 Linux/dev/sda2        1026048 234436607 116705280  8e Linux LVM/dev/sda3      234436608 234440703      2048  83 LinuxDisk /dev/mapper/vg-root: 102.6 GiB, 110125645824 bytes, 215089152 sectorsUnits: sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk /dev/mapper/vg-tmp: 1 GiB, 1073741824 bytes, 2097152 sectorsUnits: sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytes
      5. This is your root partition : Disk /dev/mapper/vg-root: 102.6 GiB
      6. Now mount this partition on /mnt point:
        # mount /dev/mapper/vg-root /mnt
      7. Nothing will be shown if above command succeeds.
      8. Now navigate to the sysconfig directory where iptables rules are saved:
        # cd /mnt/etc/sysconfig
      9. There is file called iptables which stores all the iptables rules. You just have to rename it:
        # mv iptables iptables-old
        # mv
      10. Now you have changed iptables rules and ready to reboot your system into original operating system, but you need to unmount the partition as follows:
      11. # cd
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FileZilla FTP error failed to retrieve directory listing

FilezillaMany people complain about filezilla ftp error that it is not listing directories, sometimes the issue is with firewall on local computer or sometimes it is with remote hosting server.
It gets connected but while listing directories it returns error “failed to retrieve directory listing”

According to my findings i came to know the issue is with Filezilla’s few versions. So i tried with Filezilla version 3.5.3 and i did not get even single error with it.

You can download it and check it by yourself:

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