CST8177 - Linux II
service examples: ssh, httpd 
Todd Kelley 
kelleyt@algonquincollege.com 

CST8177- Todd Kelley 

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.assignment09 questions 

.assignment10 questions 

.services and logging overview 

.sshd 

.httpd     


 
     

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Today's Topics





.Services are provided by programs running in the background, with no terminal 

.No terminal means these programs are  

.not designed to be controlled by a keyboard 

.not designed to display output to a screen 


.They are started/stopped/restarted by their init script in /etc/init.d/ 

.at bootup or change-of-runlevel automatically, or 

.manually with service command 


.They send their "output" messages to the syslog service 



Services/Logging overview
CST8177 - Todd Kelley 

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.Their behavior is controlled by a config file, where the admin specifies settings 

.They often provide the "server side"  for a client: 

.ftp client program running on a local computer connects to an ftp server program running on a remote computer 

.ssh client program running on a local computer connects to an ssh server program running on a remote computer 

.a web browser running on a local computer connects to a web server running on a remote computer  




Services/Logging overview
CST8177 - Todd Kelley 

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.SSH 

.configure port 

.configure logging  


.HTTP 

.install it 

.chkconfig it 

.start it 

.firewalling 

.play with default document 

.configuration file to change its behaviors 




Examples
CST8177 - Todd Kelley 

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