Identify disk device with the UUID
When linux system starts, auto mounting partition will be done by refering to the configuration file /etc/fstab (File System Table), in this file you specify the disk, the mount point and the type of mount to do at system startup:
# <file system> <mount point> <type>
<options> <dump> <pass>
/dev/sda1 /my/disk vfat default,umask=077,gid=46 0
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In the above example /dev/sda1 is the device you want to be mounted in /my/disk
directory, but the name /dev/sda1 can change when you change the order on your controller or when you change the port where you connect your external usb-drive.
So the name of the device isn't an unique identifier of the specific disk; you need to refer
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to it in a different way, using the UUID (Universally Unique IDentifier). The UUID is a specific identifier for this specific file system, it changes only when you reinitialize the filesystem but not when you change the order you connect it to you machine.
So you can change you /etc/fstab in this way and you no need to worry about the reordering of hard disk anymore:
UUID=1928b637-4daa-4073-b42c-14a05220ce8a /my/disk vfat defaults,umask=007,gid=46 0 0
To retrive the UUID of a specific partition you had different ways depending on your linux distribution, here are some example, try the one that fits your linux distribution:
dumpe2fs /dev/sda1 | grep -i uuid
blkid /dev/sda1
ls -l /dev/disk/by-uuid/
Solve Issue: “can’t open /etc/ntp/drift.TEMP: Permission denied”
If you get the error "can’t open /etc/ntp/drift.TEMP: Permission
denied"
in your /var/log/messages just simply modify
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driftfile /etc/ntp/drift
to the correct one:
driftfile /var/lib/ntp/drift
This is due to the fact that the ntp daemon doesn't run as root but the directory /etc/ntp is owned by root!
On the newest release of RedHat the preferred location for the drift file is the directory /var/lib/ntp but you can set an other one owned by ntp:ntp .
Enable root login in GUI Gnome
For security reason is a very bad
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idea logging in with the root account directly to you box, but if you need it here's the solution.
First of all make a backup copy of the file you need to modify:
cp /etc/gdm/gdm /etc/gdm/gdm.backup cp /etc/gdm/gdm-password /etc/gdm/gdmpassword.backup cp /etc/gdm/gdm-fingerprint /etc/gdm/gdm-fingerprint.backup
Now modify these files:
vi gdm vi gdm-password vi gdm-fingerprint
You need to comment or remove the line:
auth required pam_succeed_if.so user
!= root quiet
Reboot you system and you can logon with root in the GUI.
If you don't have the fingerprint sensor on you machine, probably you don't need to change this file!
Tested only on Fedora Core 11 & 12
Add and Remove kernel
Some simple commands to add/remove/change kernels on RedHat based Linux
Install a new kernel:
rpm -ivh kernel.....rpm
Show the kernel installed:
rpm -qa | grep kernel
Remove unused kernel:
rpm -e kernel.....
Removing kernel it
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should remove also the entries in the grub.conf
In order to check the current
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uname -a
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Show routing table in AIX
On an AIX system in order to show the routing you need to
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netstat -nr
Use OpenVPN p12 cert with NetworkManager
The Linux NetworkManager doesn't support PKCS12 files that are produced from an OpenVPN Server.
This file include both the certificate and the private key that had to be extracted.
Import the .ovpn file in Network Manager in order to setup the
Connection parameters, and extract from the .p12 file
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the UserCert,
the CACert and the UserKey with this three simple commands:
openssl pkcs12 -nocerts -in YOUR_CERT.p12 -out userkey.pem openssl pkcs12 -nokeys -clcerts -in YOUR_CERT.p12 -out usercert.pem openssl pkcs12 -nokeys -cacerts -in YOUR_CERT.p12 -out userca.pem
SSH Without a Password
In order to connect through ssh beetween linux hosts without prompting password you need to store the RSA Keys.
First log in on SERVERA as user USERA and generate a pair of authentication keys. Do not enter a passphrase:
usera@SERVERA:~> ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/usera/.ssh/id_rsa):
Created directory '/home/usera/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/usera/.ssh/id_rsa. Your public key has been saved in /home/usera/.ssh/id_rsa.pub. The key fingerprint is: 4a:4a:79:12:1b:2a:9f:3d:7c:be:f9:43:56:cb:24:e1 usera@SERVERA
Now use ssh to create a directory
~/.ssh as user userb on SERVERB. (The directory may already exist, which is fine):
usera@SERVERA:~> ssh userb@SERVERB mkdir -p .ssh userb@SERVERB's
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usera@SERVERA:~> cat .ssh/id_rsa.pub | ssh userb@SERVERB "cat - >> .ssh/authorized_keys" userb@SERVERB's password:
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Yum: quick use
* Install PackageKit:
yum install
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PackageKit
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yum
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yum install packagename
* To update some software, you type:
yum update packagename
If you leave out "packagename" yum will update all your software.
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yum check-update
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yum search word
* Use a proxy
http_proxy=proxy:portnum
export http_proxy
Ubuntu: unlock and lock root account
To unlock root account you just need
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sudo passwd root
and set a password as normal.
To lock root account you just need to remove it's password:
sudo passwd -l
root
Linux: quickly setup NFS Server
On the source server (10.1.0.1):
Modify: /etc/exports
Add:
/dir/subdir 10.1.0.2(rw,sync,no_root_squash)
Restart NFS Server:
service nfs restart
On the second server (10.1.0.2):
Create the mount point:
mkdir -p /mnt/other_server
Mount it:
mount 10.1.0.1:/dir/subdir /mnt/other_server
You can put it in rc.local if you need it mounted
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at every reboot
Quickly setup a vncserver in RedHat
(You had already installed vncserver package)
Modify: /etc/sysconfig/vncservers
VNCSERVERS="2:root"
or
VNCSERVERS="2:root 3:oracle 4:user1 5:user2"
Set vncpasswd for every use configure
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in the previous step:
su - user
vncpasswd
Start the service:
service vncserver start
Set X Server configuration:
Modifiy: /<USER_HOME>/.vnc/xstartup
Add:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc
Restart the vncserver
service vncserver restart
Set autostart of the service:
chkconfig vncserver on
Useful links:
http://www.walkernews.net/2008/06/20/configure-vnc-server-to-auto-start-up-in-red-hat-linux/
Linux ethernet bonding
Modify: /etc/modprobe.conf
Add:
alias bond0 bonding
options bond0 mode=balance- alb miimon=100
modprobe bonding
Configure interfaces
Modify ifcfg scripts:
/etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
IPADDR=10.1.0.1
NETMASK=255.255.255.0
NETWORK=10.1.0.0
BROADCAST=10.1.0.255
GATEWAY=10.1.0.254
For any physical interface:
/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
MASTER=bond0
SLAVE=yes
/etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
MASTER=bond0
SLAVE=yes
Restart network services:
service network
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