[Bug 1423613] Re: maas needs to support systemd for Ubuntu >= 15.04

[Martin Pitt]

As for the two .override files: Call "systemctl disable isc-dhcp-server
isc-dhcp-server6" in the postinst; presumably you want to disable the
IPv6 one as well (that's something that the current maas-cluster-
controller doesn't do, it doesn't ship an upstart .override for that).
Same for squid3.


As for maas-proxy.conf: "start on (local-filesystems and net-device-up IFACE!=lo)" translates to

  Requires=network-online.target
  After=network-online.target

if you don't want to start it if there's no interface. "stop on" doesn't
need to be translated, and the pre-start and start scripts can be taken
literally into

  ExecStartPre=/bin/sh -ec ' ...' lines like in the above isc-dhcp
script (note that you need to use \ for multiple lines). To make this a
bit more elegant and avoid the shell, you could split this into two
units maas-proxy-squid.service and maas-proxy-squid3.service:

[Unit]
Description=...
Requires=network-online.target
After=network-online.target
ConditionFileIsExecutable=/usr/sbin/squid

[Service]
ExecStarPre=/bin/sh -ec '. /usr/share/maas/maas-proxy-common.sh; pre_start'
ExecStart=/usr/sbin/squid -N -f /etc/maas/maas-proxy.conf

[Install]
WantedBy=multi-user.target

And a similar unit for -squid3.service.

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https://bugs.launchpad.net/bugs/1423613

Title:
  maas needs to support systemd for Ubuntu >= 15.04

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