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
dosage
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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 .
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
In order to change the kernel to load at startup edit the file /boot/grub/grub.conf.
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:
From now on you can log into B as b from A as a without password:
usera@SERVERA:~> ssh userb@SERVERB hostname SERVERB
In some Linux version (it depends on SSH version) you had to:
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- Change the permissions of .ssh to 700
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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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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/
Oracle: Export & Import through PIPE in Linux
Export example:
. /usr/local/bin/oraenv.DBNAME
gzip -9 < /export/exp_DBNAME_PIPE > /export/export_DBNAME.dmp.gz &
exp system/manager@DBNAME file=/export/exp_DBNAME_PIPE full=y
compress=n feedback=50000 direct=y log=/export/export.log
Import example:
. /usr/local/bin/oraenv.DBNAME
gunzip -c /export/export_DBNAME.dmp.gz > /expoprt/exp_DBNAME_PIPE &
imp system/manager@DBNAME file=/export/exp_DBNAME_PIPE? fromuser=ABC touser=XYZ tables=(tab1,tab2) commit=y feedback=50000 ignore=y
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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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Some useful
links:
http://www.devco.net/archives/2004/11/26/linux_ethernet_bonding.php
http://linux-ip.net/html/ether-bonding.html
http://www.kernel.org/pub/linux/kernel/people/marcelo/linux-2.4/Documentation/networking/bonding.txt