Config IPTables to provide a firewall by only exposing ports you want to communicate through.
service iptables start
chkconfig iptables on
service iptables status
iptables -I RH-Firewall-1-INPUT 3 -p tcp -m tcp –dport 80 –tcp-flags SYN,RST,ACK SYN -j ACCEPT
/etc/init.d/iptables save
By default there is no caching enabled in MYSQL, to improve performance, add a little memory to the cache to help speed up responses by storing queries.
in mysql type
show variables like 'query_cache_size';
this will show the value of the current cache size, to modify the cache size use ->
SET GLOBAL query_cache_size = 16777216;
That sets the cache to 16mb of each instance of mysql that runs. Don’t over do this value if you are running on a VPS with limited resources.
How do you know if your cache size is right? Check out the Qcaches and look at the results
show status like "qcache%";
find out the process ID of a process
pidof processname
to kill it?
kill -9 PID
scp username@hostB:~/myfile.file /localdir
hostB is the remote server we want to copy the file from
create database dbname;
use dbname;
source dbname.sql;
System Info – procinfo
procinfo gathers some system data from the /proc directory and prints it formatted on the screen.
Some of the information displayed is
Last Boot time
Load Average
average number of jobs running
number of runnable processes
total number of processes
PID of the last process run (idem)
Swap info
Memory resources
Number of disks
IRQ info
Installed modules (with the -a or -m option)
File Systems (with the -a or -m option)
To automatically update the displayed info every 30 seconds
yum install procinfo
procinfo -fn30
sync; echo 3 > /proc/sys/vm/drop_caches
Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
This is a non-destructive operation, and dirty objects are not freeable, the user should run “sync” first in order to make sure all cached objects are freed
export EDITOR=nano
Install the Virtual Viewer VNC Client
yum install virt-viewer
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