Archive for May, 2008
Make sure you no other yum update service/process running.
Proxy variable without authentication:
export http_proxy=”http://proxyserver:port”
Proxy variable with authentication:
export http_proxy=”http://username:password@proxyserver:port”
Configure VNC to run at startup
vi /etc/sysconfig/vncservers
…
VNCSERVERS=”1:username”
VNCSERVERARGS[1]=”-geometry 1024×768″
…
Use ntsysv to configure vncserver to run at startup.
Configure vnc session to use GNOME
su – username # if necessary
cd .vnc
cp -p xstartup xstartup.orig
vi xstartup
###Begin file###
#!/bin/sh
# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc
[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80×24+10+10 -ls -title “$VNCDESKTOP Desktop” &
startx &
###End file###
Note: Make sure there is not blank line after the startx line.
service vncserver restart
Use your vnc client to connect to hostname:1.
top: Basic system monitoring tool. The following three tools use the same kind of display method.
iptstate: Used to monitor iptables traffic.
atop: Used to monitor overall system. Keeps historical data too.
iftop: Used to monitor network interfaces
Examples:
iptstate -f -L -t
atop 3
iftop -i eth1
top
Backup to a remote file location using tar over ssh:
tar cvzf – /localdirectory | ssh ssh root@remotehostname “dd of=/remotefilename”
Backup to a remote tape device using tar over ssh:
tar cvzf – /localdirectory | ssh ssh root@remotehostname $(mt -f remotetapedevice rewind; dd of=/remotetapedevice)$
Restore from a remote file location using tar over ssh:
cd /
ssh root@remotehostname “dd if=/remotefilename” | tar zxvf –
Examples:
Backup:
tar cvzf – /boot | ssh ssh root@thisis.myserver.name “dd of=/backup/boot.tar.gz”
tar cvzf – /boot | ssh ssh root@thisis.myserver.name $(mt -f /dev/nrst0 rewind; dd of=/dev/nrst0)$
Restore:
ssh root@thisis.myserver.name “dd if=/boot.tar.gz” | tar zxvf –