Centos 7 install SSH , LAMP(replace mariadb with Mysql-server) & webmin

Install SSH

yum -y install openssh*

after installation complete. start the service

service sshd start


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Install LAMP

yum  -y  install  httpd  php  php-mysql  mariadb mariadb-server

Set MARIADB start when boot and start now

systemctl start mariadb
systemctl enable mariadb
Set Apache start when boot and start now

systemctl start httpd.service
systemctl enable httpd.service
After that , double check the firewall setting to make sure ports are opened correctly.

Edit use this command
vi /etc/sysconfig/iptables

After edit , please restart the service again
/etc/init.d/iptables restart

Double check the firewall status
/sbin/iptables -L -n

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Download Webmin & install (Remarks, please install & start all service for LAMP before install webmin)

wget http://prdownloads.sourceforge.net/webadmin/webmin-1.831-1.noarch.rpm

then install optional dependencies with :

yum -y install perl perl-Net-SSLeay openssl perl-IO-Tty

and then run the command :

rpm -U webmin-1.831-1.noarch.rpm

more details can be find at :
http://www.webmin.com/rpm.html

BOOT Repair for Linux

Boot Ubuntu live CD

Start a terminal and 
 
To add boot-repair to the repository

sudo add-apt-repository ppa:yannubuntu/boot-repair

To Update your repository

sudo apt-get update

To install boot-repair

sudo apt-get install -y boot-repair

Once Installation complete run boot-repair on terminal by typing the following command.

boot-repair

SME Linux 8 Backup terminated: pre-backup failed - status: 256

After workstation restore full system and all function and data normal but 
the workstation backup cannot run and have this message

Backup terminated: pre-backup failed - status: 256

The ldap may be down Please use the command below to fix.

sv d /service/ldap
rm -f /var/lib/ldap/__db.00{1,2,3,4,5,6} /var/lib/ldap/alock
rm -f /var/run/openldap/slapd.{pid,args}
sv u /service/ldap

Good luck!

PresentationFontCache.exe uses 50%+ of the CPU

Delete all Font*.dat in C:\Windows\ServiceProfiles\LocalService\AppData\Local\  and reboot it.

Good Luck

Read mutli session DVD Disc via linux

mount /dev/sr0 /media/dvd -o session=0

if you want to see the session try this command

cdrdao disk-info --device /dev/sr0

how to change linux software raid md device name and lvm volume group name

     
 Sometimes you want to move a harddisk or a raid set to other linux machine. But you will find that the raid and lvm setting will have error. It prompt you that the md name and/or lvm name encounter problem due to same name.(normally it caused by the default installation.) You can change the md name and lvm name as below:


connect the old harddisk or raid set in a computer which is no other harddisk and  raid set.

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change md name


start ubuntu live cd

apt-get install lvm2
if not yet installedin your ubuntu version

apt-get install mdadm
if not yet installedin your ubuntu version

Start with (assume your raid set is md127)

mdadm --detail /dev/md127

or if just only have incomplete raid set like one harddisk in raid 1.
(assume your harddisk partition is sda1)
mdadm --examine /dev/sda1

Version : 0.90

The first line or second line shows the metadata version used by this array. Now, stop the array:

mdadm --stop /dev/md127
mdadm --remove /dev/md127

And assemble it again using the new name. (metadata version is 1.0 or higher, use this:)

mdadm --assemble /dev/md3 /dev/sd[abcdefghijk]1 --update=name

For old metadata structure (most likely 0.90, as it allows for kernel auto-assembly), use this:

mdadm --assemble /dev/md3 --update=super-minor /dev/sd[abcdefghijk]1

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change vg name

boot linux rescue or ubuntu live cd/usb

in command prompt or terminal key in

lvm vgscan
lvm lvscan
lvm vgchange -a y
lvm pvscan
lvm lvscan

The last two commands should list your volume group(s) and logical volume(s). We use vgrename to change the name.

lvm vgrename VolGroup00 to-what-you-want-to-be
                   

Linux, linux box (NAS), cannot be login by win98

use the steps below to fix it.


1.Add these three lines to the [globals] section of your smb.conf:

lanman auth = Yes
client lanman auth = Yes
client plaintext auth = Yes

2.Restart the Samba server

3.Re-input passwords for every Win9x user:
smbpasswd -a username

4.Have every Win9x user log out and then log in again.

If you want to know why then you can visit the link below:

http://www.troubleshooters.com/linux/win9x_samba.htm