Basic Service & Settings pmli

Basic Service e.g. http, ftp, etc.

Computer Center, CS, NCTU 3 Most Common Flow 1.Install  Package, ports and tar-ball 2.Configuration  Program specified config file  rc.conf 3.Startup 4.Maintenance after installation of a service rc.conf: used for booting process

Computer Center, CS, NCTU 4 Configuration Files (1/3)  Local-installed programs’ configuration files can be found in /usr/local/etc Daemon → program-name.conf  dhcpd.conf user-program → program-namerc  wgetrc  tinrc  Default config file usually installed with.sample or.default suffix dhcpd.conf.sample or different suffix for different purpose php.ini-dist php.ini-recommended copy before use it We got sample files accompanied! Location of files And naming convention

Computer Center, CS, NCTU 5 Configuration Files (2/3)  A program with many config files are usually located in /usr/local/etc/program-name/ apach22 postfix  Most config files have clear comment at the beginning or before each description  Most popular styles name value name = value Read documents to know each option’s meaning Example: proftpd.conf # Port 21 is the standard FTP port. Port 21 # To prevent DoS attacks, set the maximum # number of child processes to 30. ….. MaxInstances 30 Put into dir. if more than one file Configuration files with comments inside and consistent naming convention

Computer Center, CS, NCTU 6 Configuration Files (3/3)  Some with local effectiveness Markup language-like setting-for-this-path… Samba 、 rsync [xxxx] settings… [yyyy] settings…. Settings for specific conditions…

RC Script Scripts for starting/stopping a service

Computer Center, CS, NCTU 8 RC Script  Dependency between each service is described in header of the script  Rcorder is used to find out dependency ordering of each script  Each rc script define what to do when start/stop …  /etc/rc.subr defines what to do & check before/after start stop …. Automatically starting and… Dependency!! Dependency!!

Computer Center, CS, NCTU 9 How to use rc script(1/2)  Example ntpd >/etc/rc.d/ntpd Usage: /etc/rc.d/ntpd [fast|force|one](start|stop|restart|rcvar|status|poll)  After booting… (rc.conf) Pidfile: Record (master) process id of the service  Start / Stop / Restart (Start after stop)  Rcvar Display which rc.conf variable are used to control the startup of service Ex: ntpd_enable=“YES” Usage of RC script on a service: Take ntpd as an example Display settings in rc.conf – you can’t start a service without setting Enable to “YES”

Computer Center, CS, NCTU 10 How to use rc script(2/2)  Status Check the service is running or not  Reload Reload configuration file if the service support  [One | fast | force] One  set rcvar = yes  Start the service even if XXXX_enable=NO Force  Set rcvar = yes and Fast  Skip pid check Force a service to run… (skip rc.conf check) (skip pid check)

Computer Center, CS, NCTU 11 Local installed service  After install a service by ports, ports will display This port has installed the following startup scripts which may cause these network services to be started at boot time. /usr/local/etc/rc.d/pure-ftpd  Use path-to-rcscript rcvar command to know which variable should set to “YES” to enable this service  For further information, read comments from that script # Add the following lines to /etc/rc.conf to enable pure-ftpd: # # pureftpd_enable="YES" # # For launch uploadscript daemon define # pureftpd_upload_enable="YES" # pureftpd_uploadscript="/full/path/to/launch_script"