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Commit 27ea1385 authored by Dimitris Aragiorgis's avatar Dimitris Aragiorgis Committed by Christos Stavrakakis
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Changes in networks doc 

Signed-off-by: default avatarDimitris Aragiorgis <dimara@grnet.gr>
parent c832bbf2
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docs/networks.rst
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......@@ -94,28 +94,25 @@ Ganeti Level section):
Existing network flavors are the following:
- ``DEFAULT``: { bridged, br0, aa:00:00, [] }
- ``IP_LESS_ROUTED``: { routed, snf_public, aa:00:00, [ip-less-routed] }
- ``MAC_FILTERED``: { bridged, br0, pool, [mac-filtered] }
- ``PHYSICAL_VLAN``: { bridged, pool, aa:00:00, [physical-vlan] }
- ``CUSTOM``: {}
- ``IP_LESS_ROUTED``: { routed, snf_public, aa:00:00, ip-less-routed }
- ``MAC_FILTERED``: { bridged, br0, pool, private-filtered }
- ``PHYSICAL_VLAN``: { bridged, pool, aa:00:00, physical-vlan }
- ``CUSTOM``: { bridged, br0, aa:00:00, None}
The end-user is allowed to create only networks of flavor ``MAC_FILTERED`` and
``PHYSICAL_VLAN``. The administrator is able to create any of the above flavors or
explicitly define any of their options (mode, link, etc..) using the
`snf-manage network-create` command. In this case the flavor of the network is
marked as ``CUSTOM`` and cannot make use of existing pools. Because of that
link or mac uniqueness cannot be guaranteed.
``PHYSICAL_VLAN``. The administrator is able to create any of the above flavors
and override their default values by explicitly passing mode, link, etc.. using
the `snf-manage network-create` command. Currently only ``MAC_FILTERED`` and
``PHYSICAL_VLAN`` can use existing pools and cannot be overriden.
Network @ Ganeti level
----------------------
Currently, Ganeti does not support IP Pool management. However, we've been
actively in touch with the official Ganeti team, who are reviewing a relatively
big patchset that implements this functionality. We hope that the functionality
will be merged to the Ganeti master branch soon and appear on Ganeti 2.7.
You can find it in https://code.grnet.gr/git/ganeti-local stable-2.6-grnet
(among with hotplug and external storage interface support).
Currently, Ganeti does support IP Pool management. The functionality
has been merged in the Ganeti master branch and will appear on Ganeti 2.7.
If you want to use hotplug and external interface as well, you can clone
our local repo https://code.grnet.gr/git/ganeti-local and checkout
stable-2.6-ippool-hotplug-esi branch.
Any network created in Synnefo is also created in one (for public networks) or
all (for private networks) Ganeti backends. In Ganeti a network can have the
......@@ -147,7 +144,7 @@ networks in Synnefo. According to which flavors you want to support, you should
have already setup all your physical hosts correspondingly. This means you
need:
- one bridge for the ``DEFAULT`` flavor (br0, see Fig. 1)
- one bridge for the ``CUSTOM`` flavor (br0, see Fig. 1)
- one bridge for the ``MAC_FILTERED`` flavor (prv0, see Fig. 2)
- a number of bridges and their corresponding VLANs (bridged to them) for
the ``PHYSICAL_VLAN`` flavor (prv1..prv100, see Fig. 3)
......@@ -163,24 +160,27 @@ FLAVORS
As mentioned earlier supported flavors are:
- DEFAULT
- CUSTOM
- IP_LESS_ROUTED
- MAC_FILTERED
- PHYSICAL_VLAN
- CUSTOM
In the following sections we mention what configuration imposes each flavor from
Synnefo, Ganeti and Physical host perspective.
DEFAULT
-------
DEFAULT SCENARIO
----------------
In this case we will bridge all primary interfaces of the VMs on one bridge that must
be the same collition domain with the router. The router sould then forward packets
(if a public IPv4 Subnet is available) or do NAT in order to provide internet access to
the VMs.
To create a network with DEFAULT flavor run you have to pre-provision in each Ganeti
node one bridge (e.g. ``br100``) that will be on the same collition domain with the
router. To this end if we assume that ``eth0`` is the public interface run:
To this end we will use the CUSTOM flavor and pre-provision in each Ganeti
node one bridge (e.g. ``br100``). If we assume that ``eth1`` is the physical interface
connected to the router, run:
.. image:: images/network-bridged.png
:align: right
......@@ -190,14 +190,12 @@ router. To this end if we assume that ``eth0`` is the public interface run:
.. code-block:: console
# brctl addbr br100
# vconfig add eth0 100
# ip link set eth0.100 up
# brctl addif br100 eth0.100
# brctl addif br100 eth1
# ip link set br100 up
# brctl show
bridge name bridge id STP enabled interfaces
br100 8000.8a3c3ede3583 no eth0.100
br100 8000.8a3c3ede3583 no eth1
......@@ -205,11 +203,11 @@ Then in Cyclades run:
.. code-block:: console
# snf-manage network-create --subnet=5.6.7.0/27 --gateway=5.6.7.1 --subnet6=2001:648:2FFC:1322::/64 --gateway6=2001:648:2FFC:1322::1 --public --dhcp --flavor=DEFAULT --name=default --backend-id=1
# snf-manage network-create --subnet=5.6.7.0/27 --gateway=5.6.7.1 --subnet6=2001:648:2FFC:1322::/64 --gateway6=2001:648:2FFC:1322::1 --public --dhcp --flavor=CUSTOM --link=br100 ----name=default --backend-id=1
# snf-manage network-list
id name flavor owner mac_prefix dhcp state link vms public IPv4 Subnet IPv4 Gateway
1 default DEFAULT True ACTIVE br100 True 5.6.7.0/27 5.6.7.1
1 default CUSTOM True ACTIVE br100 True 5.6.7.0/27 5.6.7.1
This will add a network in Synnefo DB and create a network in Ganeti backend by
issuing:
......@@ -225,11 +223,12 @@ issuing:
To enable NAT in a Internal Router if you do not have a public IP range available
but only a public routable IP (e.g 5.6.7.1):
but only a public routable IP (e.g 1.2.3.4):
.. code-block:: console
# iptables -t nat -A POSTROUTING -o eth0.100 --to-source 5.6.7.1 -j SNAT
# ip addr add 5.6.7.1/27 dev eth1
# iptables -t nat -A POSTROUTING -o eth1 --to-source 1.2.3.4 -j SNAT
IP_LESS_ROUTED
--------------
......@@ -242,22 +241,17 @@ IP_LESS_ROUTED
To create a network with IP_LESS_ROUTED flavor run you have to pre-provision in
each Ganeti node one routing table (e.g. ``snf_public``) that will do all the
routing from/to the VMs' taps. Additionally you must enable ``Proxy-ARP``
support. All traffic will be on a single VLAN (e.g. ``.201``). To this end if
we assume that ``eth0`` is the public interface run:
support. All traffic will be on a single iterface (e.g. ``eth1``).
.. code-block:: console
# vconfig add eth0 201
# ip link set eth0.201 up
# echo 1 > /proc/sys/net/ipv4/conf/ip_fowarding
# echo 10 snf_public >> /etc/iproute2/rt_tables
# ip route add 5.6.7.0/27 dev eth0.201 ??????
# ip route add 5.6.7.0/27 dev eth0.201 table snf_public
# ip route add default via 5.6.7.1 dev eth0.201 table snf_public
# ip rule add iif eth0.201 lookup snf_public
# arptables -A OUTPUT -o eth0.201 --opcode 1 --mangle-ip-s 5.6.7.30
# ip route add 5.6.7.0/27 dev eth1
# ip route add 5.6.7.0/27 dev eth1 table snf_public
# ip route add default via 5.6.7.1 dev eth1 table snf_public
# ip rule add iif eth1 lookup snf_public
# arptables -A OUTPUT -o eth1 --opcode 1 --mangle-ip-s 5.6.7.30 # last ip in Subnet
Then in Cyclades run:
......@@ -290,8 +284,8 @@ MAC_FILTERED
To create a network with MAC_FILTERED flavor you have to pre-provision in each Ganeti
node one bridge (e.g. ``prv0``) that will be bridged with one VLAN (e.g. ``.400``)
across the whole cluster. To this end if we assume that ``eth0`` is the public interface run:
node one bridge (e.g. ``prv0``) that will be bridged with one interface (e.g. ``eth2``)
across the whole cluster.
.. image:: images/network-mac.png
:align: right
......@@ -301,14 +295,12 @@ across the whole cluster. To this end if we assume that ``eth0`` is the public i
.. code-block:: console
# brctl addbr prv0
# vconfig add eth0 400
# ip link set eth0.400 up
# brctl addif prv0 eth0.400
# brctl addif prv0 eth2
# ip link set prv0 up
# brctl show
bridge name bridge id STP enabled interfaces
prv0 8000.8a3c3ede3583 no eth0.400
prv0 8000.8a3c3ede3583 no eth2
......@@ -316,17 +308,19 @@ Then in Cyclades first create a pool for MAC prefixes by running:
.. code-block:: console
# snf-manage pool-create --type=mac-prefix --base=aa:00:00 --size=65536
# snf-manage pool-create --type=mac-prefix --base=aa:00:0 --size=65536
and the create the network:
.. code-block:: console
# snf-manage network-create --subnet=192.168.1.0/24 --gateway=192.168.1.0/24 --dhcp --flavor=MAC_FILTERED --name=mac --backend-id=1
# snf-manage network-create --subnet=192.168.1.0/24 --gateway=192.168.1.0/24 --dhcp --flavor=MAC_FILTERED --link=prv0 --name=mac --backend-id=1
# snf-manage network-list
id name flavor owner mac_prefix dhcp state link vms public IPv4 Subnet IPv4 Gateway
3 mac MAC_FILTERED aa:00:01 True ACTIVE prv0 False 192.168.1.0/24 192.168.1.1
Edit the synnefo setting `DEFAULT_MAC_FILTERED_BRIDGE` to `prv0`.
This will add a network in Synnefo DB and create a network in Ganeti backend by
issuing:
......@@ -346,9 +340,11 @@ issuing:
PHYSICAL_VLAN
-------------
To create a network with PHYSICAL_VALN flavor you have to pre-provision in each Ganeti
node a range of bridges (e.g. ``prv1..20``) that will be bridged with the corresponding VLANs (e.g. ``401..420``)
across the whole cluster. To this end if we assume that ``eth0`` is the public interface run:
across the whole cluster. To this end if we assume that ``eth3`` is the interface to use, run:
.. image:: images/network-vlan.png
:align: right
......@@ -359,15 +355,15 @@ across the whole cluster. To this end if we assume that ``eth0`` is the public i
.. code-block:: console
# for i in {1..20}; do
br=prv$i ; vlanid=$((400+i)) ; vlan=eth0.$vlanid
br=prv$i ; vlanid=$((400+i)) ; vlan=eth3.$vlanid
brctl addbr $br ; ip link set $br up
vconfig add eth0 vlanid ; ip link set vlan up
brctl addif $br $vlan
done
# brctl show
bridge name bridge id STP enabled interfaces
prv1 8000.8a3c3ede3583 no eth0.401
prv2 8000.8a3c3ede3583 no eth0.402
prv1 8000.8a3c3ede3583 no eth3.401
prv2 8000.8a3c3ede3583 no eth3.402
...
......@@ -401,8 +397,8 @@ issuing:
CUSTOM
------
ADVANCED SCENARIO
-----------------
To create a network with CUSTOM flavor you have to pass your self mode, link,
mac prefix, tags for the network. You are not allowed to use the existing pools
......@@ -415,7 +411,7 @@ that he can access the VPN. Then we run in Cyclades:
.. code-block:: console
# snf-manage network-create --subnet=192.168.1.0/24 --gateway=192.168.1.0/24 --dhcp --mode=bridge --link=br200 --mac-prefix=bb:00:44 --owner=user@grnet.gr --tags=nfdhcpd,vpn --name=vpn --backend-id=1
# snf-manage network-create --subnet=192.168.1.0/24 --gateway=192.168.1.0/24 --dhcp --flavor=CUSTOM --mode=bridged --link=br200 --mac-prefix=bb:00:44 --owner=user@grnet.gr --tags=nfdhcpd,vpn --name=vpn --backend-id=1
# snf-manage network-list
id name flavor owner mac_prefix dhcp state link vms public IPv4 Subnet IPv4 Gateway
......
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