Neutron containers are not sharing namespaces

[Uriel Medina]

The container "neutron_l3_agent" is not "sharing" the namespaces.

I added the "LOG.debug" inside "neutron/agent/linux/ip_lib.py" inside the "list_network_namespaces" function,like this:

def list_network_namespaces(**kwargs):
    """List all network namespace entries.

    :param kwargs: Callers add any filters they use as kwargs
    """
    if cfg.CONF.AGENT.use_helper_for_ns_read:
        LOG.debug("Trying list_network_namespaces, with response: {response}".format(
            response=privileged.list_netns(**kwargs)
        ))
        return privileged.list_netns(**kwargs)
    else:
        return netns.listnetns(**kwargs)

When i print the "neutron-l3-agent.log" I get this (which it's all good)
2021-10-15 22:18:13.890 21 DEBUG neutron.agent.linux.ip_lib [-] Trying list_network_namespaces, with response: ('qrouter-2bc67140-8de0-4920-9fba-9fd4c0ac1ffb', 'qdhcp-7c744f36-e636-46f0-97e3-8e90ba9c296b', 'qrouter-425b0589-5d0b-4ee1-9389-4a34b1b45848', 'qdhcp-377fe94b-1f28-4eff-92f7-907798bd3f54') list_network_namespaces /var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/linux/ip_lib.py:929

But if I print the "neutron-metering-agent.log", I get no response:
2021-10-15 22:18:37.663 7 DEBUG neutron.agent.linux.ip_lib [-] Trying list_network_namespaces, with response: () list_network_namespaces /var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/linux/ip_lib.py:929

**Enviroment**
Ubuntu 20.04
Docker 20.10.9
Kolla Ansible pip package 12.2.0
Using all-in-one inventory

**Globals.yml**
config_strategy: "COPY_ALWAYS"
kolla_base_distro: "ubuntu"
kolla_install_type: "source"
openstack_release: "wallaby"
kolla_internal_vip_address: "192.168.0.12"
network_interface: "ens160"
neutron_external_interface: "ens192"
neutron_plugin_agent: "openvswitch"
enable_haproxy: "yes"
enable_neutron_metering: "yes"
docker_disable_default_iptables_rules: "no"

[Mehmet TOPCU (mehmettopcu)]

I solved the problem I had with the metering agent with the following change, it may be useful.

diff --git a/ansible/roles/neutron/defaults/main.yml b/ansible/roles/neutron/defaults/main.yml
index a1f58d6dd0dbe6ba4cb2250319c2bbec2b606578..5dc5190d1faaeee239d19922ce2f12a8995f5706 100644
--- a/ansible/roles/neutron/defaults/main.yml
+++ b/ansible/roles/neutron/defaults/main.yml
@@ -494,6 +494,9 @@ neutron_metering_agent_default_volumes:
   - "{{ node_config_directory }}/neutron-metering-agent/:{{ container_config_directory }}/:ro"
   - "/etc/localtime:/etc/localtime:ro"
   - "{{ '/etc/timezone:/etc/timezone:ro' if ansible_facts.os_family == 'Debian' else '' }}"
+ - "/lib/modules:/lib/modules:ro"
+ - "neutron_metadata_socket:/var/lib/neutron/kolla/"
+ - "/run/netns:/run/netns:shared"
   - "kolla_logs:/var/log/kolla/"
   - "{{ kolla_dev_repos_directory ~ '/neutron/neutron:/var/lib/kolla/venv/lib/python' ~ distro_python_version ~ '/site-packages/neutron' if neutron_dev_mode | bool else '' }}"
 ironic_neutron_agent_default_volumes: