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3bfe9dddf9
This DHCP exit hook to shorten the system hostname on GCE was previously
installed by build-debian-cloud and bootstrap-vz, but seems to have been
inadvertently removed in commit c81045cc6e
as part of a broad cross-cloud cleanup. Again, this was caught by our
validation tests, and we might be done with the fixes at this point.
In this commit, I'm reinstating the hook with a name change and an
explanatory comment, to reduce the risk of this vanishing accidentally
in the future.
Change-Id: I4e7268f8b9ab3b2a7fc8b510898c6fbdd685aa53
41 lines
1.8 KiB
Python
41 lines
1.8 KiB
Python
from bootstrapvz.base import Task
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from bootstrapvz.common import phases
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from bootstrapvz.common.tasks import network
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from bootstrapvz.common.tools import log_check_call
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import os.path
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class DisableIPv6(Task):
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description = "Disabling IPv6 support"
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phase = phases.system_modification
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predecessors = [network.ConfigureNetworkIF]
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@classmethod
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def run(cls, info):
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network_configuration_path = os.path.join(info.root, 'etc/sysctl.d/70-disable-ipv6.conf')
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with open(network_configuration_path, 'w') as config_file:
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print >>config_file, "net.ipv6.conf.all.disable_ipv6 = 1"
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class InstallHostnameHook(Task):
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description = "Installing hostname hook"
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phase = phases.system_modification
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@classmethod
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def run(cls, info):
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# There's a surprising amount of software out there which doesn't react well to the system
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# hostname being set to a potentially long the fully qualified domain name, including Java 7
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# and lower, quite relevant to a lot of cloud use cases such as Hadoop. Since Google Compute
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# Engine's out-of-the-box domain names are long but predictable based on project name, we
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# install this hook to set the hostname to the short hostname but add a suitable /etc/hosts
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# entry.
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#
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# Since not all operating systems which Google supports on Compute Engine work with the
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# /etc/dhcp/dhclient-exit-hooks.d directory, Google's internally-built packaging uses the
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# consistent install path of /usr/share/google/set-hostname, and OS-specific build steps are
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# used to activate the DHCP hook. In any future Debian-maintained distro-specific packaging,
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# the updated deb could handle installing the below symlink or the script itself into
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# /etc/dhcp/dhclient-exit-hooks.d.
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log_check_call(['chroot', info.root, 'ln', '-s',
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'/usr/share/google/set-hostname',
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'/etc/dhcp/dhclient-exit-hooks.d/set-hostname'])
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