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authorJoey Hess2017-10-04 13:10:59 -0400
committerJoey Hess2017-10-04 13:10:59 -0400
commit422435f505bf0c6c0e00dc85e0bfd2860b79100e (patch)
treedc0c9ac9b7dee43628525520bd3806d468ad449e /doc/forum/Using_ip_address_in_a_container/comment_1_f14578affbfdb771a74a30f535b9e9a0._comment
parent7898079adb6caa2cb0da4384542f28bd1ce21011 (diff)
avoid propagating non-alias DNS info from container to host
* When the ipv4 and ipv6 properties are used with a container, avoid propagating the address out to the host. * DnsInfo has been replaced with DnsInfoPropagated and DnsInfoUnpropagated. (API change) * Code that used fromDnsInfo . fromInfo changes to use getDnsInfo. * addDNS takes an additional Bool parameter to control whether the DNS info should propagate out of containers. (API change) This commit was sponsored by Trenton Cronholm on Patreon.
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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2017-10-04T16:08:14Z"
+ content="""
+I'd also like to use systemd-nspawn with its own network in the container.
+Have not worked through all the necessary config, which seems fairly
+complicated on the systemd side. Examples of how to do that with propellor
+would be great to have!
+
+(There's a partial example in the haddock for
+Systemd.publish, which uses networkd to auto-configure a private network,
+but IIRC that is missing some routing/masqerading to let the
+container access the internet.)
+
+As for `alias` and `ipv4` properties, when used in a container, their info
+does get propagated out to the info of the host as of propellor 4.8.1.
+That was done because it's sometimes useful to have an `alias` be part
+of a container's configuration and get the DNS server automatically
+configured with that alias pointing at the host(s) that have the container.
+
+I agree it does not make sense for `ipv4`/`ipv6` used in a container
+to propagate out. I've changed propellor to not do that any longer,
+and allow controlling whether any given DNS info should propagate or not.
+
+As for the hostname, it's not currently part of the Info system,
+and so there's no risk of a container overriding its Host's name.
+Things like Hostname.sane that look at the hostname will see the parent
+host's name. Hostname.setTo should work in a container to give it
+its own name. (At some point it would probably be worth moving hostnames
+into Info to avoid the extra complication..)
+"""]]