Editing LAMP Basic Training

'''PHP based service:'''


TO run a website the basic prerequisites are:

# Network access ,i.e, static ip
# DNS to resolve the for name server lookup problems.
# LAMP= Linux,Apache.Mysql,Perl/PHP

Functions:

# Monitoring
# Basic configuration (PHP/MY SQL)
# Log analysis/Understanding
# Basic perimeters and understandings
# PHP.ini
# PHPMyadmin

'''Tips:'''

* While configuring ''basic apache server,'' all we need is ‘Documentary Root’.
* In case Apache needs to be run on different predefined port then ''firstly ''it should be free ''secondly ''it should be assign with <virtualhost: *__>
* Don’t ignore the ‘conf.d’ directory, it contains the crucial files which are necessary to up the service.
* Production sites are virtual hosted with configuration file generally named as “''configuration.php”.''
* ''CMS is usually integrated with MySql.'' MySql should be provided with separate user for access for security reasons.
* Allowance should be given to localhost only.
* In MySql,’ /etc/my.conf’ is used for linking PHPMyAdmin. And the 4 IPs of T.I.S should be allowed in the argument “allow from” to hold the access with tetra only.
* '''Remember: '''''PHPMyadmin is not recommended but is used for convenient purpose of developers.''

<u>'''''PHPMyadmin:'''''</u>

* Its a tool used used for integration purpose (usually with mySql and Ldap).
* It ease the administration of the services.

<u>'''MySql Engines:'''</u>

* MyISAM- Default working engines.
* INNODB- used for tuning and performance .
* FEDRA- used in huge federated environment.
* NDB- used for clustering purpose.
* ARCHIVE - used for storing large amounts of data without indexes with a very small footprint. 
* CSV - stores data in text files using comma-separated values format. 

== Log Analysis : ==
''Logs gives us the right mechanism to diagnose and troubleshoot the problem.''

'''Tips:'''

* ‘.htaccess’ is basically used for over-writing the rules and thus can only be applicable when ‘allowoverride’ argument is passed in httpd.conf file.
* Log rotation is basically the concept use in the ''log analysis. ''

== Infrastructure Monitoring: ==
In reference to T.I.S, monitoring is used to monitor URLs. Service configured in respect of URL may be following:

# http = to monitor ''header mapping, page size, number of sessions.''
# CPU= to monitor memory services and all.
# Disk = to check lvm, disk usage etc.

=== IMPORTANT NOTE: ===
* '''‘top’''' command informs only about the '''''maximum utilization of resources by applications'''.''
* To check number of sessions, use following:

# 
## 
### ‘ps aux | grep httpd’
### ‘netstat –a | grep httpd –established'
###  'lsof

* ‘whois’ is a tool to know about detail information about domains. Same way SSL certificates can be verified too by site

'''Benchmark & tuning:'''

# In httpd tuning can be done through the command ‘ab’. Similarly in case of MySql tool is ‘mysqltuning.pl’
# 70% of tuning is resides within the code itself, rest 30% can be manually configured.