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[Benjamin Allot <1899852@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hello,

Let's first list my configuration items:
* apache2 2.4.29-1ubuntu4.14
* release: Ubuntu 18.04.5 LTS

Upon reboot, the following message is seen in apache2.service logs:

-- Unit apache2.service has begun starting up.
Oct 14 12:18:32 SERVER apachectl[3833]: (99)Cannot assign requested address: AH00072: make_sock: could not bind to address [REDACTED IPV6.33]:443
Oct 14 12:18:32 SERVER apachectl[3833]: no listening sockets available, shutting down
Oct 14 12:18:32 SERVER apachectl[3833]: AH00015: Unable to open logs
Oct 14 12:18:32 SERVER apachectl[3833]: Action 'start' failed.
Oct 14 12:18:32 SERVER apachectl[3833]: The Apache error log may have more information.
Oct 14 12:18:33 SERVER systemd[1]: apache2.service: Control process exited, code=exited status=1
Oct 14 12:18:33 SERVER systemd[1]: apache2.service: Failed with result 'exit-code'.
Oct 14 12:18:33 SERVER systemd[1]: Failed to start The Apache HTTP Server.

The apache2 configuration is using the ipv4 and ipv6 present on the server:
/etc/apache2/ports.conf:Listen <REDACTED ipv4.245>:443
/etc/apache2/ports.conf:Listen <REDACTED ipv4.247>:443
/etc/apache2/ports.conf:Listen [REDACTED IPV6::33]:443
/etc/apache2/ports.conf:Listen [REDACTED IPV6::35]:443

and the /etc/network/interfaces look as this (no netplan):
# Additional IPs that are used to serve https traffic for
# releases.ubuntu.com so that archive doesn't respond on 443.
auto bond0:1
iface bond0:1 inet static
    address <REDACTED IPV4>.247/32
    # Using up/down to avoid LP:1347246.
    up /sbin/ip addr add REDACTED IPV6::33/128 dev $IFACE preferred_lft 0
    down /bin/ip addr del REDACTED IPV6::33/128 dev $IFACE preferred_lft 0

# Additional IPs that are used to serve *.clouds.archive.ubuntu.com
# with HTTPProtocolOptions unsafe, which is needed to work around
# cloud-init bug LP:1868232 (cRT#125271).
auto bond0:2
iface bond0:2 inet static
    address <REDACTED IPV4>.245/32
    # Using up/down to avoid LP:1347246.
    up /sbin/ip addr add REDACTED IPV6::35/128 dev $IFACE preferred_lft 0
    down /bin/ip addr del REDACTED IPV6::35/128 dev $IFACE preferred_lft 0

I was surprised that the apache2.service does not contain a 
After=network-online.target

$ systemctl show apache2.service | grep -E '(Wants|Require|After|Before)'
RemainAfterExit=no
Requires=system.slice sysinit.target -.mount
Before=multi-user.target shutdown.target
After=basic.target sysinit.target systemd-journald.socket system.slice network.target nss-lookup.target systemd-tmpfiles-setup.service remote-fs.target -.mount
RequiresMountsFor=/var/tmp /tmp

$ systemctl show network.target | grep "^After"
After=network-pre.target ifup@bond0.service ifup@ens2f0.service ifup@ens2f1.service systemd-resolved.service ufw.service networking.service systemd-networkd.service

So I was wondering if the "ifup@bond0" was enough as a dependency here,
to be sure to have the ipv6 up and running or if we would need something
like "ifup@bond0:2" and "ifup@bond0:1" as part of the list of the
services in the network.target "After" list.

** Affects: apache2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1899852

Title:
   Cannot assign requested address: AH00072: make_sock: could not bind
  to address

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