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I want to stop some daemons from loading at boot time, specially squid3. What is the best way of doing this?

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+1 perfectly phrased for someone searching for the answer to this question. – msw Jan 26 '11 at 2:43
up vote 6 down vote accepted

You can use chkconfiginstall chkconfig utility for this purpose.

sudo apt-get install chkconfig

To check the run level status of squid you can run this command:

 chkconfig --list | grep squid

This will output something like below:

squid           0:off   1:off   2:on    3:on    4:on    5:on    6:off

To turn off squid in all run level you can use this command:

sudo chkconfig  squid off

 chkconfig --list | grep squid

squid           0:off   1:off   2:off   3:off   4:off   5:off   6:off

To turn off squid in a particular run level you can use this command:

 chkconfig  --level 3  squid off
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We have 7 leveles from (0 - 6).What are those levels?Can you explain us? – karthick87 Dec 2 '10 at 12:51
@karthik87:Here is a nice article about linux run levels. This will help you : – aneeshep Dec 2 '10 at 13:12
+1 complete, canonical, authoritative – msw Jan 26 '11 at 2:44
What about upstart scripts? – Javier Rivera Jan 26 '11 at 9:51

System daemons can use either legacy SysV init scripts or the newer Upstart.

For sysv scripts there are several management tools, one of such tools is "sysv-rc-conf" from the "sysv-rc-conf" package, install it and launch it from the terminal.

Regarding Upstart as far as I know there is no management tool yet, you need to manually rename the corresponding script from /etc/init, eg:

mv /etc/init/ufw.conf /etc/init/ufw.conf.disabled

Squid3 uses sysv init scripts, you can disable it with sysv-rc-conf .

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Addendum: When moving your upstart job away, you cannot manually start it anymore. It's probably better to just uncomment the "start on" part in the .conf file. – htorque Dec 2 '10 at 9:12

Squid uses the old init system, so this command should do the trick: sudo update-rc.d -f squid3 remove.

For more find-grained control of when to start/stop the service: sudo sysv-rc-conf

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Ad 1.: that will also remove the links to stop the service, which is probably not what you want in case you started it manually. – htorque Dec 2 '10 at 9:13
That's wrong, you can always start/stop it with /etc/init.d/squid3 start or stop. – evgeny Dec 2 '10 at 9:23
It will remove the K*-links that stop the service automatically. ;) – htorque Dec 2 '10 at 9:53
Who would want that anyway? ;) – evgeny Dec 2 '10 at 10:24
The lazy people (ME)! :-P – htorque Dec 2 '10 at 11:03

Two the simplest ways (from my point of view).

1) mv /etc/init/squid3.conf /etc/init/squid3.conf.disabled

2) comment out the following line

start on runlevel [2345]

in /etc/init/squid3.conf

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