Public bug reported:
due to the way the systemd service file for apache2 is configured,
Apache is started before the Network has been configured by the system,
as a result, it fails to start if it is required to bind to a specific
IP or interface.
I'm not sure where is the best to fix this, so I'm reporting this on
apache. One fix I can imagine is if the systemd service file is modified
to wait for all network interfaces to be configured first, or wait for a
specific interface. This is the way I intend to workaround this in my
case (which will likely cause me to get prompted every update about
overwriting).
[workaround]
Systemd provides an executable which will block until a specified interface is
available, and this can be used to make apache wait until the desired interface
is configured by using the ff directive in the unit file:
ExecStartPre=/lib/systemd/systemd-networkd-wait-online -i enp4s0
In this case above, systemd will wait until interface enp4s0 is up (assigned an
IP) before it attempts to start apache2. You can replace en04s0 with the
relevant interface on your machine.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: apache2 2.4.29-1ubuntu4.2
ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
Apache2ConfdDirListing: False
Apache2Modules:
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Sun Aug 12 09:37:54 2018
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: apache2
UpgradeStatus: No upgrade log present (probably fresh install)
error.log:
[Sun Aug 12 06:25:02.256640 2018] [mpm_prefork:notice] [pid 26304] AH00163:
Apache/2.4.29 (Ubuntu) configured -- resuming normal operations
[Sun Aug 12 06:25:02.256703 2018] [core:notice] [pid 26304] AH00094: Command
line: '/usr/sbin/apache2'
[Sun Aug 12 09:18:11.209390 2018] [mpm_prefork:notice] [pid 26304] AH00169:
caught SIGTERM, shutting down
modified.conffile..etc.apache2.apache2.conf: [modified]
modified.conffile..etc.apache2.ports.conf: [modified]
mtime.conffile..etc.apache2.apache2.conf: 2018-05-09T00:13:58.013470
mtime.conffile..etc.apache2.ports.conf: 2018-05-08T20:15:00.040132
** Affects: apache2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1786675
Title:
Apache will not start on boot if bound to a fixed IP address
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