List of LiveChat Services/Software/Scripts (Free & Paid)

Here is a detailed list of all the available free and paid live chat/support scripts/softwares/apps to make live interaction with your visitors possible. Having a LiveChat or Live Support feature definitely increases the chances of improving sales & generating confirm leads with the potential clients.

1. Chatra
https://chatra.io

2. GoSquared
https://www.gosquared.com

3. Drift
https://www.drift.com

4. Intercom
https://www.intercom.com

[HOWTO] Create LVM in Linux CentOS 6, 7 / RHEL 7 / Oracle Linux 7

Linux LVM

LVM stands for Logical Volume Management. It is a system of managing logical volumes, or filesystems, that is much more advanced and flexible than the traditional method of partitioning a disk into one or more segments and formatting that partition with a filesystem. ~ Wikipedia

The main advantage of using LVM is that if you are using any kind of virtualization, then the isolation of disk space will be an ease.
To create LVM in Linux CentOS just follow these simple steps

1. Create new Partition using fdisk tool and select partition type as Linux-LVM

[[email protected] ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xfd3bf27d.

Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039):
Using default value 41943039
Partition 1 of type Linux and of size 20 GiB is set

Command (m for help): p

Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xfd3bf27d

Device Boot Start End Blocks Id System
/dev/sdb1 2048 41943039 20970496 83 Linux

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): L

0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): p

Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xfd3bf27d

Device Boot Start End Blocks Id System
/dev/sdb1 2048 41943039 20970496 8e Linux LVM

Now here you need to reboot once. Some people might get an error which I will explain in another article, on how to resolve it.

2. Initialize the Partition /dev/sdb1 as LVM PV (Physical Volume)

[[email protected] ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created

3. Do a quick scan for Block Devices

[[email protected] ~]# lvmdiskscan
/dev/centos/swap [ 2.00 GiB]
/dev/sda1 [ 500.00 MiB]
/dev/centos/root [ 27.51 GiB]
/dev/sda2 [ 29.51 GiB] LVM physical volume
/dev/sdb1 [ 20.00 GiB] LVM physical volume
2 disks
1 partition
0 LVM physical volume whole disks
2 LVM physical volumes

4. Now display Physical Volumes

There are three commands which you need to use to display properties of LVM physical volumes:
pvs, pvdisplay, and pvscan.

The pvdisplay command provides a verbose multi-line output for each physical volume. It displays
physical properties (size, extents, volume group, etc.) in a fixed format.

[[email protected] ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size 29.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 7554
Free PE 0
Allocated PE 7554
PV UUID JvDOto-KDiF-gtca-TveX-ne9M-frsB-qsP1aJ

"/dev/sdb1" is a new physical volume of "20.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 20.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID rJ8wl7-xzIN-2qqV-ov7Z-lHKe-ELge-aAV29V

The pvscan command scans all supported LVM block devices in the system for physical volumes
[[email protected] ~]# pvscan
PV /dev/sda2 VG centos lvm2 [29.51 GiB / 0 free]
PV /dev/sdb1 lvm2 [20.00 GiB]
Total: 2 [49.51 GiB] / in use: 1 [29.51 GiB] / in no VG: 1 [20.00 GiB]

Now we successfully created a Physical Volume. Next we need to create Volume Group as it will be required to add LVMs to the VG.

5. Create Volume Group named vg_newlvm and add /dev/sdb1 partition into the group

[[email protected] ~]# vgcreate vg_newlvm /dev/sdb1
Volume group "vg_newlvm" successfully created

If you have more than one partition, you can add multiple partition in single command. This command creates a local volume named vg_newlvm that contains physical volumes /dev/sdb1 and /dev/sdc1 :

[[email protected] ~]# vgcreate vg_newlvm /dev/sdb1 /dev/sdc1

6. Create a logical volume called centos7_newvol that uses all of the unallocated space in the volume group vg_newlvm

[[email protected] ~]# lvcreate --name centos7_newvol -l 100%FREE vg_newlvm
Logical volume "centos7_newvol" created

7. Display the created logical volumes :

[[email protected] ~]# lvdisplay
..
..
--- Logical volume ---
LV Path /dev/vg_newlvm/centos7_newvol
LV Name centos7_newvol
VG Name vg_newlvm
LV UUID szlkNP-0lwe-f59Z-PJVU-X7pG-unBL-qN10D4
LV Write Access read/write
LV Creation host, time centos7.ehowstuff.local, 2015-01-25 15:15:48 +0800
LV Status available
# open 0
LV Size 20.00 GiB
Current LE 5119
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2

8. Use the mkfs command to format a newly created LVM

[[email protected] ~]# mkfs.ext4 /dev/vg_newlvm/centos7_newvol
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1310720 inodes, 5241856 blocks
262092 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2153775104
160 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

9. Create the mount point and mount the new LVM

[[email protected] ~]# mkdir -p /data
[[email protected] ~]# mount /dev/vg_newlvm/centos7_newvol /data

10. Verify the new disk layout

[[email protected] ~]# df -h
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos-root 28260132 9191032 17610516 35% /
devtmpfs 1935888 0 1935888 0% /dev
tmpfs 1941892 0 1941892 0% /dev/shm
tmpfs 1941892 8728 1933164 1% /run
tmpfs 1941892 0 1941892 0% /sys/fs/cgroup
/dev/sda1 487634 73191 384747 16% /boot
tmpfs 1941892 8728 1933164 1% /var/named/chroot/run/named
/dev/mapper/vg_newlvm-centos7_newvol 20507216 45080 19397384 1% /data

There, done. Now you have successfully created LVM in your linux machine.

How to Upload/Transfer files from Computer to Server via PuTTy

This is a very simple tutorial for the novice users who are learning UNIX systems. Sometimes you may require to upload a local file which is there on your desktop computer to a remote server having no FTP access. Just follow the below mention steps and you will be able to upload/transfer files to server via PuTTy client.
Read More “How to Upload/Transfer files from Computer to Server via PuTTy”

noVNC Mouse not working in Chrome

noVNCnoVNC is a browser based VNC Client which is developed by Kanaka using HTML5 Canvas and WebSockets. It is used to remotely connect with virtual machines to perform admin tasks. We have noVNC enabled on our South Korea VPS packages. Recently we got complaints from few of our clients stating that they were unable to use their mouse in the noVNC screen. They reported that the cursor would not move. A little bit investigation and brainstorming it was revealed that this is a known bug with Google Chrome & Internet Explorer 10 browser on a touchscreen based monitor/laptop.
Read More “noVNC Mouse not working in Chrome”

[FIX] WordPress Permalinks on Nginx+PHP-fpm VestaCP

VestaCPNginx WordPress

 

 

 

VestaCP is a popular free control panel for servers. It has a lot of features for any novice user who has less knowledge of running a linux server. Recently once of our clients installed VestaCP on his Poland VPS and installed WordPress. Everything was set and his permalinks wasn’t working. He reached out to us to help him and after a little bit of research we came to know that the file structure Vesta CP creates seemed to be different. So this fix helped the client overcome his problem.
Read More “[FIX] WordPress Permalinks on Nginx+PHP-fpm VestaCP”