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Accepted
Abbas Mehdi
Asked: 2019-03-22 01:15:04 +0800 CST

Do I really need Apache2?

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I have apache2.service enlisted in the output of systemd-analyze critical-chain, taking more than 5.5 seconds!

Why is apache2 even installed on my system when I am not running a web server?

Response to Tomasz Gandor

Thanks, Tomasz. Here is the output response:

$ aptitude why apache2
i   phpliteadmin-themes Depends    phpliteadmin                 
i A phpliteadmin        Recommends apache2 (>= 2.4.6-4~) | httpd

And I think it's just a theme, so it would be safe to remove it. Should I?

Response to PerlDuck

Thanks, PerlDuck. Here is the output response:

$ apt-cache rdepends --installed apache2
apache2
Reverse Depends:
  libapache2-mod-php7.2
 |phpliteadmin
 |javascript-common
  libapache2-mod-php7.2

Now, I am not very much certain about what to do!

Also, there is one thing to be noted in the response of apt-cache rdepends, and that is the | sign before phpliteadmin and javascript-common. What does this indicate?

And why is libapache2-mod-php7.2 listed twice in the output, once at the top and once at the bottom of the list?

boot startup systemd apache2 18.10

2 Answers

  1. Best Answer

    If you don't have aptitude run:

    sudo apt install aptitude

    then:

    aptitude why apache2

    This will list packages. If you find any packages preceded by "i" and not "i A", that's why you have apache2.

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  2. As a follow-up to @TomaszGandor's answer: in case aptitude is not istalled but apt-cache is (which I think is by default), another possibility is:

    apt-cache rdepends --installed apache2

    This will list all installed packages that depend on apache2.

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