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:
# cat /sys/block/sda/queue/rotational
if above commnad returns 1 it means HDD else if it returns 0 then it is SSD.
# 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.
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.
- Boot your server into rescue system. (If you cannot boot it you can ask your server provider to do this for you.)
- Login to rescue system via SSH and then:
- List hard disk partitions:
# fdisk -l
- Output will be like:
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
This is your root partition : Disk /dev/mapper/vg-root: 102.6 GiB
- Now mount this partition on /mnt point:
# mount /dev/mapper/vg-root /mnt
- Nothing will be shown if above command succeeds.
- Now navigate to the sysconfig directory where iptables rules are saved:
# cd /mnt/etc/sysconfig
- There is file called iptables which stores all the iptables rules. You just have to rename it:
# mv iptables iptables-old
# mv iptables.save iptables.save-old
- 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:
FileZilla FTP error failed to retrieve directory listing
Many 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: