Change-Id: I52cee3679e4a733daa165062d64884577e9acc1a
Closes-Bug: #1900082

When the internal VIP is moved in the event of a failure of the active
controller, OpenStack services can become unresponsive as they try to
talk with MariaDB using connections from the SQLAlchemy pool.

It has been argued that OpenStack doesn't really need to use connection
pooling with MariaDB [1]. This commit reduces the use of connection
pooling via two configuration options:

- max_pool_size is set to 1 to allow only a single connection in the
  pool (it is not possible to disable connection pooling entirely via
  oslo.db, and max_pool_size = 0 means unlimited pool size)
- lower connection_recycle_time from the default of one hour to 10
  seconds, which means the single connection in the pool will be
  recreated regularly

These settings have shown better reactivity of the system in the event
of a failover.

[1] http://lists.openstack.org/pipermail/openstack-dev/2015-April/061808.html

Change-Id: Ib6a62d4428db9b95569314084090472870417f3d
Closes-Bug: #1896635

It was found to be useless in [1].

It is one of distro_python_version usages.

Note Freezer and Horizon still use python_path (and hence
distro_python_version) for different purposes.

[1] https://review.opendev.org/675822

Change-Id: I6d6d9fdf4c28cb2b686d548955108c994b685bb1
Partially-Implements: blueprint drop-distro-python-version

This patch introduces a global keep alive timeout value for services
that leverage httpd + wsgi to handle http/https requests. The default
value is one minute.

Change-Id: Icf7cb0baf86b428a60a7e9bbed642999711865cd
Partially-Implements: blueprint add-ssl-internal-network

This patch introduces an optional backend encryption for Horizon and
Placement services. When used in conjunction with enabling TLS for
service API endpoints, network communcation will be encrypted end to
end, from client through HAProxy to the Horizon and Placement services.

Change-Id: I9cb274141c95aea20e733baa623da071b30acf2d
Partially-Implements: blueprint add-ssl-internal-network

The use of default(omit) is for module parameters, not templates. We
define a default value for openstack_cacert, so it should never be
undefined anyway.

Change-Id: Idfa73097ca168c76559dc4f3aa8bb30b7113ab28

Currently the WSGI configuration for binary images uses python2.7
site-packages in some places. This change uses distro_python_version to
select the correct python path.

Change-Id: Id5f3f0ede106498b9264942fa0399d7c7862c122
Partially-Implements: blueprint python-3

Include a reference to the globally configured Certificate Authority to
all services. Services use the CA to verify HTTPs connections.

Change-Id: I38da931cdd7ff46cce1994763b5c713652b096cc
Partially-Implements: blueprint support-trusted-ca-certificate-file

Change-Id: I51144d92f34ed51c499a4119c059e6475d02eb46

Introduce kolla_address filter.
Introduce put_address_in_context filter.

Add AF config to vars.

Address contexts:
- raw (default): <ADDR>
- memcache: inet6:[<ADDR>]
- url: [<ADDR>]

Other changes:

globals.yml - mention just IP in comment

prechecks/port_checks (api_intf) - kolla_address handles validation

3x interface conditional (swift configs: replication/storage)

2x interface variable definition with hostname
(haproxy listens; api intf)

1x interface variable definition with hostname with bifrost exclusion
(baremetal pre-install /etc/hosts; api intf)

neutron's ml2 'overlay_ip_version' set to 6 for IPv6 on tunnel network

basic multinode source CI job for IPv6

prechecks for rabbitmq and qdrouterd use proper NSS database now

MariaDB Galera Cluster WSREP SST mariabackup workaround
(socat and IPv6)

Ceph naming workaround in CI
TODO: probably needs documenting

RabbitMQ IPv6-only proto_dist

Ceph ms switch to IPv6 mode

Remove neutron-server ml2_type_vxlan/vxlan_group setting
as it is not used (let's avoid any confusion)
and could break setups without proper multicast routing
if it started working (also IPv4-only)

haproxy upgrade checks for slaves based on ipv6 addresses

TODO:

ovs-dpdk grabs ipv4 network address (w/ prefix len / submask)
not supported, invalid by default because neutron_external has no address
No idea whether ovs-dpdk works at all atm.

ml2 for xenapi
Xen is not supported too well.
This would require working with XenAPI facts.

rp_filter setting
This would require meddling with ip6tables (there is no sysctl param).
By default nothing is dropped.
Unlikely we really need it.

ironic dnsmasq is configured IPv4-only
dnsmasq needs DHCPv6 options and testing in vivo.

KNOWN ISSUES (beyond us):

One cannot use IPv6 address to reference the image for docker like we
currently do, see: https://github.com/moby/moby/issues/39033
(docker_registry; docker API 400 - invalid reference format)
workaround: use hostname/FQDN

RabbitMQ may fail to bind to IPv6 if hostname resolves also to IPv4.
This is due to old RabbitMQ versions available in images.
IPv4 is preferred by default and may fail in the IPv6-only scenario.
This should be no problem in real life as IPv6-only is indeed IPv6-only.
Also, when new RabbitMQ (3.7.16/3.8+) makes it into images, this will
no longer be relevant as we supply all the necessary config.
See: https://github.com/rabbitmq/rabbitmq-server/pull/1982

For reliable runs, at least Ansible 2.8 is required (2.8.5 confirmed
to work well). Older Ansible versions are known to miss IPv6 addresses
in interface facts. This may affect redeploys, reconfigures and
upgrades which run after VIP address is assigned.
See: https://github.com/ansible/ansible/issues/63227

Bifrost Train does not support IPv6 deployments.
See: https://storyboard.openstack.org/#!/story/2006689



Change-Id: Ia34e6916ea4f99e9522cd2ddde03a0a4776f7e2c
Implements: blueprint ipv6-control-plane
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

Both ubuntu source and binary install type support python3 now,
python_path should be updated.

Depends-On: https://review.opendev.org/675581
Partially Implements: blueprint python3-support

Change-Id: I4bf721b44220bde2d25d4d985f5ca411699a5a72

Currently placement-api is configured to log to
/var/log/kolla/placement/placement-api.log, but config.json is changing
permissions of /var/log/kolla/placement/placement.log - this patch
changes this.

Change-Id: I7f1591bdbc7c03302befc3ca6ebf1b13c95640c2

1. The Keystone WSGI scripts don't have a python3- prefix, although they
   are using python 3.

2. The Placement WSGI script doesn't have a python3- prefix, although it
   is using python 3.

Depends-On: https://review.openstack.org/651327
Change-Id: I805df8f85634edea8322495ca73897d44967cfe6
Closes-Bug: #1823989

RDO is packaging placement-api with bundled httpd config
and it conflicts with kolla-ansible generated one.

Change-Id: I018a4ed1b2282e8a789b63e3893e61db2fde8cf2

Depends-On: https://review.openstack.org/#/c/642958
Depends-On: https://review.openstack.org/642984
Change-Id: If795a9eb3ec92f75867ce3f755d6b832eba31af9