Backup and Restore your Centos

Posted on March 16, 2019 by Gkhan

Backup and Restore your Centos 7

Some time you want to take backup of your server including application and settings .below are the easy method a small example

1- The first step is to create a location to store the backup. For this article we’re going to store the backup on the same hard drive as the installed operating system

2-Make a backup directory where you will keep backup file.

mkdir /backup

3- Now we will create a compressed version of the Operating System in one single file (tarball) using the tar command.

tar cvpzf /backup/backup.tgz --exclude=/proc --exclude=/lost+found --exclude=/backups --exclude=/dev --exclude=/sys --exclude=/boot/grub --exclude=/boot/grub2 --exclude=/etc/fstab --exclude=/etc/sysconfig/network-scripts/ --exclude=/etc/udev/rules.d/70-persistent-net.rules  /

Now transfer your backup.tgz file to new server .In order to restore your server from the previously created tarball the server must have the same Operating System version loaded on it.

To Restore your backup use the following.

tar xvpfz /backups/backup.tgz -C /

 

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Downgrade Centos 6.x Kernel Version

Posted on March 16, 2019 by Gkhan

VOS3000 2.1.4.0 does not support latest Kernel Versions. you have to downgrade Kernel 

mkdir download
cd download/
wget http://vault.centos.org/6.4/os/x86_64/Packages/kernel-2.6.32-358.el6.x86_64.rpm
yum list kernel-2.6.32-358*
yum install kernel-2.6.32-358.el6.x86_64.rpm
ls
vi /boot/grub/menu.lst
reboot
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How to stop and start ApacheTomcat VOS3000 2.1.4.0

Posted on March 16, 2019 by Gkhan

Login to your server

To STOP Apache Tomcat Server

# /home/kunshiweb/base/apache-tomcat/bin/shutdown.sh

To START Apache Tomcat server

#/home/kunshiweb/base/apache-tomcat/bin/startup.sh

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Centos 5.X yum update

Posted on March 16, 2019 by Gkhan

Update of packages using default repositories (base, update etc.) is no longer applicable.You should switch boxes, run on CentOS 5.x., to so called Vault repositories.

1- Disable base, updates and other enabled repositories (where enabled=1 is set) in the CentOS-Base.repo: 

sed -i 's/enabled=1/enabled=0/g' /etc/yum.repos.d/CentOS-Base.repo

create a new repo file and enter the following lines

vim  /etc/yum.repos.d/CentOS-Vault.repo

[c5.11-base]
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
gpgcheck=1
name=CentOS-5.11 - Base
baseurl=http://vault.centos.org/5.11/os/$basearch/
exclude=ruby* libyaml* corosync* corosynclib* pacemaker*
enabled=1
[c5.11-updates]
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
gpgcheck=1
name=CentOS-5.11 - Updates
baseurl=http://vault.centos.org/5.11/updates/$basearch/
exclude=ruby* libyaml* corosync* corosynclib* pacemaker*
enabled=1

original link :- https://docs.onapp.com/misc/eol-centos-5-x

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How to Install VMware Tools on CentOS 7

Posted on October 28, 2018 by Gkhan

How to Install VMware Tools on CentOS 7

# yum install -y open-vm-tools

check file is exist

# ls /usr/bin/vmtoolsd

Now reboot the server

 

 

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How to check directory size in Linux

Posted on October 25, 2018 by Gkhan

How to check directory size in Linux

DU command uses for disk uses you can use du command to check directory size.

for example you want to check directory size of a folder  "database"
use -h for size in MB GB etc 

# du -h ./database/
17G     ./database/
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How to update Centos 5 .X and cannot find a valid baseurl for repo

Posted on August 27, 2018 by Gkhan

How to update Centos 5 .X and cannot find a valid baseurl for repo

If you are using CentOS 5.x and want to install any software and update CentOS 5.x  . you are getting following error .

root@server1 [~]# yum update -y
Loaded plugins: fastestmirror
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base

This is because update repositories were moved to the CentOS vault when the operating reached it's end-of-life.

Edit the following file

Continue reading →

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vos3000 illegal calls query to block IP address

Posted on August 23, 2018 by Gkhan

vos3000 illegal calls query to block IP address

All call records are saved in e_cdr_files

you can query to get ip addresses of illegal calls source.

mysql> select DISTINCT callerip from e_cdr_20180818 where endreason = ‘-9’;
+—————-+
| callerip |
+—————-+
| 195.154.93.229 |
| 50.2.187.130 |
| 5.62.63.181 |
| 216.244.84.202 |
| 37.49.231.161 |
| 88.198.57.146 |
| 37.49.231.63 |
| 50.22.52.22 |
| 93.190.143.70 |
| 216.244.73.98 |
+—————-+
10 rows in set (0.00 sec)

if someone can write a script to get IP address from current date CDR  for every 5 min and update the iptables automatically.

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How to configure Mikrotik DHCP Server for Cisco Phone TFTP option

Posted on August 7, 2018 by Gkhan

How to configure Mikrotik DHCP Server for Cisco Phone TFTP option

1- Change your TFTP server IP in to hex code

you can use this online tool : http://www.miniwebtool.com/ip-address-to-hex-converter/

2- Now configure Mikrotik RouterOS :

/ip dhcp-server option add code=150 name=ciscotftp value=0xC0A80307

Continue reading →

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