Force container deletion if namespace does not exist in service_kill

When a service is stopped using "service_kill" script and the
namespace where the container is running does not exist, the
container process should be forced to stop from the root namespace.

A namespace where a process is running, can be deleted whitout
stopping the mentioned process. "ip netns identify <PID>" then
returns an empty string (root namespace).

If the namespace where a container was executed is deleted,
"service_kill" script should execute a container related command
from the root namespace. To access to the root namespace from
inside a container, running in another namespace, it is necessary
to gain access via "nsenter", specifying the parameter "--all" to
access to all namespaces of the target process.

This patch will prevent an endless loop in Neutron DHCP agent. As
reported in the related bug, when a DHCP agent is resync, the DHCP
helper (metadata proxy) is stopped. In case this process stop raises
an exception (for example if the namespace does not exist), schedules
again a resync, creating an endless loop.

This patch combines [1] and [2] in this repository.
[1]https://review.opendev.org/#/c/714517/
[2]https://review.opendev.org/#/c/730657/

Change-Id: Ifb7dbfb93a7cf0b50ef15652d83d87f65bdb6221
Closes-Bug: #1868607
changes/31/730831/1
Rodolfo Alonso Hernandez 3 years ago
parent e3331ea725
commit 0bc1383a60

@ -17,13 +17,13 @@ SIG=$1
PID=$2
NETNS=$(ip netns identify ${PID})
{% if container_cli == 'podman' %}
if [ "x${NETNS}" == "x" ]; then
add_date "No network namespace detected, exiting"
exit 1
CLI="nsenter --all --preserve-credentials -t 1 podman"
SIG=9
else
CLI="nsenter --net=/run/netns/${NETNS} --preserve-credentials -m -t 1 podman"
fi
{% if container_cli == 'podman' %}
CLI="nsenter --net=/run/netns/${NETNS} --preserve-credentials -m -t 1 podman"
{% elif container_cli == 'docker' %}
{% if docker_additional_sockets and docker_additional_sockets|length > 0-%}
export DOCKER_HOST=unix://{{ docker_additional_sockets[0] }}

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