Archive for September, 2008
Tuesday, September 23rd, 2008
Added some new fresh servers to nagios:
cd /usr/local/share/nagios/etc/servers
Add host-file to that directory. In host-file add services:
http
Edit following files (add new hosts):
/usr/local/share/nagios/etc/hostgroups.cfg (add server to hostgroup / VMWare group / )
/usr/local/share/nagios/etc/hostextinfo.cfg
/etc/n2rrd/templates/maps/service_name_maps
Installed snmp and nrpe on servers to check additional services:
yum install net-snmp.x86_64
service snmpd start
chkconfig --level 2345 snmpd on
yum install nagios-nrpe
service nrpe ...
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Tuesday, September 16th, 2008
Applied for and installed SSL certificate on CentOS Moodle server:
1. check if Apache runs mod_ssl and setup httpd.conf to listen to port 443
yum install mod_ssl
edit ssl.conf, add "NameVirtualHost *:443" to allow for name based virtual hosts.
edit the DocumentRoot in the VirtualHost section
2. Create CSR (Certificate Signing Request):
Generate A Private Key
openssl ...
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Monday, September 15th, 2008
Mysql provides client apps with most distributions. On CentOS these are bundles in the mysql rpm. On some distros there are wrappers around the mysqlcheck program like mysqloptimize, mysqlanalyze, mysqlrepair. In CentOS these should be called with mysqlcheck with options like -a, -o or -r.
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Thursday, September 4th, 2008
Setting a reporting concept for client. Things to report:
Global:
Date
Week
Site name
Site contact 1/2
Version
Last update
enrolled users
# active users
# courses
# groups
Course:
this weeks most popular course (by unique ip)
this weeks most popular course (by activity)
I create an aggregate dashboard kind of report which is clickable which allows each item to link to the history ...
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Tuesday, September 2nd, 2008
Got some problems with a client's mysql database. Some processes were 'blocking' the rest. No heavy server load or anything. So after checking and optimizing a few key Moodle tables performance was back on track:
CHECK TABLE mdl_user / mdl_course_sections / mdl_log
OPTIMIZE TABLE mdl_user / mdl_course_sections / mdl_log
Seems logical as with ...
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Tuesday, September 2nd, 2008
Got a strange issue after installing a new Moodle on our shared server:
I suspected this was due to some MaxClients (Apache) or max_connection (postgres) setting and after a bit of googling I found out that that was the case:
This is a common problem when there are more apache processes than ...
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Tuesday, September 2nd, 2008
INHERITANCE APPROACH
- Advantage
- easy to inherit an implementation
- Disadvantage
- may be difficult to adapt to changing roles
INTERFACE APPROACH
- Advantages
- can be clearer what methods must be implemented.
- A class in another inheritance hierarchy can provide the services of an interface.
- Disadvantage
- may end up with lots of helper classes.
Things to ...
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