Automatic merge from submit-queue
rkt: Fix hostnetwork.
Mount hosts' /etc/hosts, /etc/resolv.conf, set host's hostname
when running the pod in the host's network.
Fix#24235
cc @kubernetes/sig-node
Mount hosts' /etc/hosts, /etc/resolv.conf, set host's hostname
when running the pod in the host's network.
Besides, do not set the DNS flags when running in host's network.
Previously, the service file's name is 'k8s_${POD_UID}.service',
which means we need to `systemctl daemon-reload` if the we replace
the content of the service file (e.g. pod is restarted).
However this makes the journal in the previous pod get disconnected.
This PR solves the issue by using the unique rkt uuid as the service
file's name. After the change, the service file's name will be:
'k8s_${rkt_uuid}.service'.
Add GeneratePodHostNameAndDomain() to RuntimeHelper to
get the hostname of the pod from kubelet.
Also update the logging flag to change the journal match from
_HOSTNAME to _MACHINE_ID.
Using json makes this robust to ENTRYPOINT/CMD that contains space.
Also removed 'RemainAfterExit' option, originally this option is
useful when we implement GetPods() by 'systemctl list-units'.
However since we are using rkt API service now, it's no longer needed.
This enables rkt runtime to setup versions during creation,
this fixes a kubelet nil pointer panic when kubelet tries to get the
rkt versions but it's not set.
Use an array to store the pod IDs and use that to build the pod array with consistent ordering,
instead of map ordering, which is random and causes test flakes.
If 'TerminationMessagePath' in container spec is set, then
We will mount the termination message log into the container.
Also in GetPodStatus, if the container exits and the 'TerminationMessagePath'
is set, then the 'message' field in container state will be populated.
This address a TODO when collecting the node version information so it
will properly report the configured runtime and its version. Previously,
this was hardcoded to "docker://" and the docker version, and would show
"docker://1.9.1" even when the kubelet was configured to use rkt.
With this change, it will use the runtime's Type() and Version() data.
This also changes the container.Runtime interface to add an APIVersion()
method. This can be used when the runtime has separate versions for the
engine and the API, such as with Docker. The Docker minimum version
validation has been updated to use APIVersion(), and
DockerManager.Version() now returns the engine version.
