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Managing daemons from a terminal session
If you want to manage a daemon on a Linux system, how do you do it?
• It's likely that you cannot
log in directly as the dameon user, as the account will almost certainly not have a valid encoded password string, so every attempt to give a password (including just pressing "enter" when asked) would fail.
• I hope
you system has been set up so that your ordinary user account can't control the daemon. It would require quite deliberate tampering with permissions, or an extraordinary user and group system, to allow this in any case.
• You could
log in as root (that's provided that you have the password and access to a place from which root login is allowed), but this would be dangerous - you would have no protection against errors, and you would need to do a lot of checking and re-chown
ing of files.
Here's what to do:
1. Log in as your regular user
2. Use su -
(note the minus sign please) to become root. You WILL need to know the root password, but you won't need to be a terminal / port that allows direct root logins
3. Use su - [dameonname]
(where [daemonname] is the name of the user who runs the daemon) to become that daemon user. Since root can su
to another user without giving a password, you'll become the daemon user at this point.
Note that each su
command starts a subshell, so you should exit from each shell when completed - do NOT su
back to your original user as you'll start to build up more and more shell layers ...
As explained on our Introduction to Linux Admin
day during last week's Deploying LAMP
(written 2012-07-01, updated 2012-07-14)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesA164 - Web Application Deployment - Services and Regular Jobs 
Starting MySQL. ERROR! The server quit without updating PID file - how we fixed it. - (2015-05-06) 
The Kernel, Shells and Daemons. Greek Gods in computing - (2012-07-01) 
On time - (2011-01-23) 
What are .pid files? - (2010-10-23) 
What Linux run level am I in? - (2009-05-15) 
Using the internet to remotely check for power failure at home (PHP) - (2009-04-29) 
daemons - what is running on my Linux server? - (2008-11-23) 
Dialects of English and Unix - (2008-08-21) 
memcached - overview, installation, example of use in PHP - (2008-08-02) 
Apache httpd, MySQL, PHP - installation procedure - (2008-08-01) 
FTP server on Fedora Linux - (2008-07-06) 
Changing a screen saver from a web page (PHP, Perl, OSX) - (2008-05-06) 
Automatic startup and shutdown of Tomcat - (2008-02-24) 
Linux run states, shell special commands, and directory structures - (2007-08-03) 
Linux / Unix - process priority and nice - (2007-01-10) 
Browser -> httpd -> Tomcat -> MySQL. Restarting. - (2006-10-28) 
Repeating tasks with crontab - (2005-12-27)
Some other Articles
Backquote, backtic, str and repr in Python - conversion object to stringLike a bathroom company with no plumbersShould hotel staff sit on the toilet in the customer bedrooms?Excellent Rail News - what it really meansManaging daemons from a terminal sessionSolution looking for a problem? Lookahead and LookbehindMore than just matching with a regular expression in PHPGetting more than a yes / no answer from a regular expression pattern matchMelksham Pride - the Chamber of Commerce, and the future
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