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OpenStack Zed : Configure Neutron (Network Node)
2022/11/10
 
Configure OpenStack Network Service (Neutron).
This example is not on the All in One Settings like here, but Configure the 3 Nodes environment like follows.
Neutron needs a plugin software, it's possible to choose it from some softwares.
It chooses ML2 plugin on this example. ( it uses Open vSwitch under the backend )
------------+-----------------------------+-----------------------------+------------
            |                             |                             |
        eth0|10.0.0.30                eth0|10.0.0.50                eth0|10.0.0.51
+-----------+-----------+     +-----------+-----------+     +-----------+-----------+
|   [ dlp.srv.world ]   |     | [ network.srv.world ] |     |  [ node01.srv.world ] |
|     (Control Node)    |     |     (Network Node)    |     |     (Compute Node)    |
|                       |     |                       |     |                       |
|  MariaDB    RabbitMQ  |     |  Neutron L2/L3 Agent  |     |        Libvirt        |
|  Memcached  Nginx     |     |   Neutron Metadata    |     |      Nova Compute     |
|  Keystone   httpd     |     |     Open vSwitch      |     |    Neutron L2 Agent   |
|  Glance     Nova API  |     |                       |     |      Open vSwitch     |
|  Neutron Server       |     |                       |     |                       |
|  Neutron Metadata     |     |                       |     |                       |
+-----------------------+     +-----------------------+     +-----------------------+

[1] Configure OpenStack Zed repository like here of [3] and Install Neutron services on Network Node.
# install from Zed, EPEL, CRB

[root@network ~]#
dnf --enablerepo=centos-openstack-zed,epel,crb -y install openstack-neutron openstack-neutron-ml2 openstack-neutron-openvswitch libibverbs
[2] Configure Neutron servides.
[root@network ~]#
mv /etc/neutron/neutron.conf /etc/neutron/neutron.conf.org

[root@network ~]#
vi /etc/neutron/neutron.conf
# create new

[DEFAULT]
core_plugin = ml2
service_plugins = router
auth_strategy = keystone
state_path = /var/lib/neutron
allow_overlapping_ips = True
# RabbitMQ connection info
transport_url = rabbit://openstack:password@dlp.srv.world

# Keystone auth info
[keystone_authtoken]
www_authenticate_uri = https://dlp.srv.world:5000
auth_url = https://dlp.srv.world:5000
memcached_servers = dlp.srv.world:11211
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = neutron
password = servicepassword
# if using self-signed certs on httpd Keystone, turn to [true]
insecure = false

[oslo_concurrency]
lock_path = $state_path/lock

[root@network ~]#
chmod 640 /etc/neutron/neutron.conf

[root@network ~]#
chgrp neutron /etc/neutron/neutron.conf
[root@network ~]#
vi /etc/neutron/l3_agent.ini
[DEFAULT]
# line 2 : add

interface_driver = openvswitch
[root@network ~]#
vi /etc/neutron/dhcp_agent.ini
[DEFAULT]
# line 2 : add

interface_driver = openvswitch
dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
enable_isolated_metadata = true
[root@network ~]#
vi /etc/neutron/metadata_agent.ini
[DEFAULT]
# line 2 : add to specify Nova API server

nova_metadata_host = dlp.srv.world
nova_metadata_protocol = https
# specify any secret key you like

metadata_proxy_shared_secret = metadata_secret
# specify Memcache server

memcache_servers = dlp.srv.world:11211
[root@network ~]#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# add to the end
# OK with no value for [tenant_network_types] now (set later if need)

[ml2]
type_drivers = flat,vlan,gre,vxlan
tenant_network_types =
mechanism_drivers = openvswitch
extension_drivers = port_security
[root@network ~]#
vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
# add to the end

[securitygroup]
firewall_driver = openvswitch
enable_security_group = true
enable_ipset = true
[3] If SELinux is enabled, change policy like follows.
[root@network ~]#
dnf --enablerepo=centos-openstack-zed -y install openstack-selinux

[root@network ~]#
setsebool -P neutron_can_network on

[root@network ~]#
setsebool -P haproxy_connect_any on

[root@network ~]#
setsebool -P daemons_enable_cluster_mode on

[root@network ~]#
vi ovsofctl.te
# create new

module ovsofctl 1.0;

require {
        type crontab_exec_t;
        type gpg_exec_t;
        type hostname_exec_t;
        type keepalived_exec_t;
        type openflow_port_t;
        type neutron_tmp_t;
        type neutron_t;
        type neutron_exec_t;
        type neutron_t;
        type dnsmasq_t;
        type tracefs_t;
        type nsfs_t;
        type openvswitch_load_module_t;
        class file { execute_no_trans getattr open read };
        class dir search;
        class filesystem unmount;
        class sock_file { create unlink write };
        class tcp_socket name_bind;
        class capability { dac_override sys_rawio };
}

#============= neutron_t ==============
allow neutron_t self:capability { dac_override sys_rawio };
allow neutron_t neutron_exec_t:file execute_no_trans;
allow neutron_t neutron_tmp_t:sock_file { create unlink write };
allow neutron_t openflow_port_t:tcp_socket name_bind;
allow neutron_t crontab_exec_t:file getattr;
allow neutron_t gpg_exec_t:file getattr;
allow neutron_t hostname_exec_t:file getattr;
allow neutron_t keepalived_exec_t:file getattr;
allow neutron_t nsfs_t:file { getattr open read };
allow neutron_t nsfs_t:filesystem unmount;

#============= openvswitch_load_module_t ==============
allow openvswitch_load_module_t tracefs_t:dir search;

#============= dnsmasq_t ==============
allow dnsmasq_t self:capability dac_override;

[root@network ~]#
checkmodule -m -M -o ovsofctl.mod ovsofctl.te

[root@network ~]#
semodule_package --outfile ovsofctl.pp --module ovsofctl.mod

[root@network ~]#
semodule -i ovsofctl.pp

[4] Start Neutron services.
[root@network ~]#
ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

[root@network ~]#
systemctl enable --now openvswitch

[root@network ~]#
ovs-vsctl add-br br-int

[root@network ~]#
systemctl enable --now neutron-dhcp-agent neutron-l3-agent neutron-metadata-agent neutron-openvswitch-agent

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