Dec 02 2010
Advanced MRTG Configurations
Introduction
In many cases using MRTG in a basic configuration to monitor the volume of network traffic to your server isn’t enough. You may also want to see graphs of CPU, disk, and memory usage. This chapter explains how to find the values you want to monitor in the SNMP MIB files and then how to use this information to configure MRTG.
All the chapter’s examples assume that the SNMP Read Only string is craz33guy and that the net-snmp-utils RPM package is installed (see Chapter 22, “ Monitoring Server Performance“). Read more …
Jul 19 2010
How to DISABLE ipv6 in CentOS5 System
# ifconfig
eth1 Link encap:Ethernet HWaddr 00:1C:F0:BB:A7:28
inet addr:10.10.10.11 Bcast:10.10.10.255 Mask:255.255.255.0
inet6 addr: fe80::21c:f0ff:febb:a728/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:470449435 errors:1 dropped:0 overruns:0 frame:0
TX packets:464084402 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2563674692 (2.3 GiB) TX bytes:2243518951 (2.0 GiB)
Interrupt:225 Base address:0×2800
Jul 11 2010
Scripting a MySQL InnoDB Engine Conversion
0) Backup your database.
You should probably be doing this already. Now’s a good time to make sure that your backups ran.
1) Create the script.
You’ll need the correct permissions to query the database. Here’s the command. Be sure to change <DATABASE_NAME> as it fits.
# mysql -p -e "show tables in <DATABASE_NAME>;" | \
tail --lines=+2 | \
xargs -i echo "ALTER TABLE {} ENGINE=INNODB;" > alter_table.sql
2) Run the script.
# mysql --database=<DATABASE_NAME> -p < alter_table.sql
3) Verify it by running this command in mysql:
mysql> show table status;
Mar 09 2010
Setting up DomainKeys on Centos
This is a quick walk through on how to set up domain keys on Centos 5 using sendmail. It should also be very similar for Redhat or Fedora.
Domainkeys is a method mostly used by yahoo to verify that the sender of an email is valid. I did notice that gmail changes the domainkeys header line to a pass value but I don’t know if they block/accept mail based on that. Read more …
