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Welcome
Category: Redhat
- Yum and RPM Tricks
This applies to Centos 5.6 but most likely it works on any rpm based distro.
1. It happened many times to mess the permissions of a file and services not to work properly. In order to get fixed I run :
rpm -qf /path/to/filerpm -qlLists all files from a package.This should show the package that contains the modified file. Then I run :
rpm --setpermsAlso this command should show a list of modified files within a package:
rpm -V2. To view the Changelog:
rpm -q --changelog| less 3. View package based on repo:
rpm -qa release="*rf*"4. Extract just one File:
rpm2cpio logrotate-1.0-1.i386.rpm |cpio -ivd etc/logrotate.conf5. Query Package Install Order and Dates
rpm -qa --last >~/RPMS_by_Install_Date6. Query Available Packages from a Repo
- Using mod_proxy in Plesk to redirect to a different site
Scenario:
Site1 : www.site.com
Site2 : shop.site2.comThe idea is to make a proxy redirect so if I access www.site.com/shop to be redirected to shop.site2.com and keep the URL in the browser.
This can be done either by using mod_rewrite (if both sites are on the same server) or by using mod_proxy. In my case I had to do this on a Plesk server.I’ve created in /var/www/vhosts/site.com/conf a file called vhost.conf that contains:
ProxyRequests off
Order deny,allow
Allow from all
ProxyPass /shop http://shop.site2.com
ProxyPassReverse /shop http://shop.site2.com
SetEnv force-proxy-request-1.0 1
SetEnv proxy-nokeepalive 1
Order allow,deny
Allow from allThen I ran:
/usr/local/psa/admin/bin/websrvmng -a -vVerify httpd.include to see if there is any Include directive.
Now if you go to www.site.com/shop/ you should be redirected to shop.site2.com. Notice the trailing slash after (../shop/). That needs to be there otherwise it won’t load the images properly.
This can be fixed by adding in vhost.conf a Rewrite rule like:
RewriteEngine on
RewriteRule ^/shop$ /shop/ [R] - Update php in Plesk
Run:
Download http://www.atomicorp.com/installers/atomic.sh
sh atomic.sh
yum update php - Install Dante socks proxy
Dante socks install :
Download Dante from : ftp://ftp.inet.no/pub/socks/dante-1.2.0.tar.gz
tar zxvf dante-1.2.0.tar.gz
cd dante-1.2.0
yum install gcc make
./configure
make -j4
make installifconfig -a | grep inet | awk ‘{print $2}’ | awk -F ‘:’ ‘{print $2}’ | grep -v 127.0.0.1 > /root/ips
for i in `cat ips` ;do echo “internal: $i port = 6060″ >> /root/sockd.conf ;done
Example of sockd.conf :
logoutput: stderr
method: username none
external: externalIPtouse
client pass {
from: 0.0.0.0/0 port 1-65535 to: 0.0.0.0/0
}
pass {
from: 0.0.0.0/0 to: 0.0.0.0/0
method: username
protocol: tcp udp
}Launch using :
sockd -f /root/sockd.conf -d
- How much disk space a database takes?
Login to mysql and run :
select SUM(data_length) + SUM(index_length) as size from information_schema.tables where table_schema = 'your_database'; - Move Windows with screen
- change to the window you want to move
- type (for example) ^a:number 1
- ^x is the host key (usually ^a on most machines) (CTRL+A)
- :number (typed literally) is the command
- 1 the number to move the current screen to