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Bug#910368: apache2: Apache does not start reliably after reboot

Package: apache2
Version: 2.4.25-3+deb9u5
Severity: important

Dear Maintainer,

when I reboot my server, most of the time, I then have to manually restart apache because it seems unable to reliably initialize upon boot.
The problem only occurs since I configured apache to listen on certain interfaces only, because I have a different server running on port 80+443 on another IP address.
I have this in my ports.conf:

  Listen [2a05:bec0:1:1:10a1:5eff:fe52:509]:80

  Listen [2a05:bec0:1:1:10a1:5eff:fe52:509]:443

It then fails to start, saying

  Okt 05 13:19:02 r-passerv.ralfj.de systemd[1]: Starting The Apache HTTP Server...
  Okt 05 13:19:02 r-passerv.ralfj.de apachectl[1003]: (99)Cannot assign requested address: AH00072: make_sock: could not bind to address [2a05:bec0:1:1:10a1:5eff:fe52:509]:80

Seems like a boot ordering problem to me.  The IPv6 address is assigned via local autoconfig, and apache starts too early.
I have tried modifying the systemd unit to fix this, to no avail.  The interwebs also say that DAD (duplicate address detection)
could be related, so I set net.ipv6.conf.all.accept_dad=0, again to no avail.

I am now playing with net.ipv6.ip_nonlocal_bind, but ideally the `Listen` directive would work out-of-the box.
It currently seems to be rather useless for IPv6 addresses.

Kind regards,

-- Package-specific info:

-- System Information:
Debian Release: 9.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-8-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages apache2 depends on:
ii  apache2-bin          2.4.25-3+deb9u5
ii  apache2-data         2.4.25-3+deb9u5
ii  apache2-utils        2.4.25-3+deb9u5
ii  dpkg                 1.18.25
ii  init-system-helpers  1.48
ii  lsb-base             9.20161125
ii  mime-support         3.60
ii  perl                 5.24.1-3+deb9u4
ii  procps               2:3.3.12-3+deb9u1

Versions of packages apache2 recommends:
ii  ssl-cert  1.0.39

Versions of packages apache2 suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
pn  www-browser                                      <none>

Versions of packages apache2-bin depends on:
ii  libapr1                  1.5.2-5
ii  libaprutil1              1.5.4-3
ii  libaprutil1-dbd-sqlite3  1.5.4-3
ii  libaprutil1-ldap         1.5.4-3
ii  libc6                    2.24-11+deb9u3
ii  libldap-2.4-2            2.4.44+dfsg-5+deb9u2
ii  liblua5.2-0              5.2.4-1.1+b2
ii  libnghttp2-14            1.18.1-1
ii  libpcre3                 2:8.39-3
ii  libssl1.0.2              1.0.2l-2+deb9u3
ii  libxml2                  2.9.4+dfsg1-2.2+deb9u2
ii  perl                     5.24.1-3+deb9u4
ii  zlib1g                   1:1.2.8.dfsg-5

Versions of packages apache2-bin suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
pn  www-browser                                      <none>

Versions of packages apache2 is related to:
ii  apache2      2.4.25-3+deb9u5
ii  apache2-bin  2.4.25-3+deb9u5

-- Configuration Files:
/etc/apache2/conf-available/other-vhosts-access-log.conf changed:

/etc/apache2/conf-available/security.conf changed:
<Directory /var/www/>
    Require all denied
ServerTokens Minor
ServerSignature Off
TraceEnable Off
Header set X-Content-Type-Options: "nosniff"
Header set X-Frame-Options: "sameorigin"

/etc/apache2/ports.conf changed:
Listen [2a05:bec0:1:1:10a1:5eff:fe52:509]:80
Listen [2a05:bec0:1:1:10a1:5eff:fe52:509]:443

/etc/apache2/sites-available/000-default.conf changed:
<VirtualHost *:80>
    Redirect temp / https://www.ralfj.de/
<VirtualHost *:443>
    Use SSL letsencrypt/live
    Redirect temp / https://www.ralfj.de/

/etc/logrotate.d/apache2 changed:
/var/log/apache2/*.log {
	rotate 7
	create 640 root adm
                if /etc/init.d/apache2 status > /dev/null ; then \
                    /etc/init.d/apache2 reload > /dev/null; \
		if [ -d /etc/logrotate.d/httpd-prerotate ]; then \
			run-parts /etc/logrotate.d/httpd-prerotate; \
		fi; \

-- no debconf information

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