-
Apollon Oikonomopoulos authored
Signed-off-by:
Apollon Oikonomopoulos <apollon@noc.grnet.gr>
2d25bcdf
design-network.rst 2.94 KiB
Network management
gnt-network add --network=192.0.2.0/24 --gateway=192.0.2.1 \
--v6-network=2001:648:2ffc::/64 --v6-gateway=2001:648:2ffc::1 \
public
gnt-network reserve-ips public 192.0.2.2 192.0.2.10-192.0.2.20
gnt-network connect public nodegroup1 link100
gnt-network connect public nodegroup2 link200
gnt-network disconnect public nodegroup1 (only permitted if no instances are
currently using this network in the group)
gnt-network list
Name IPv4 Network IPv4 Gateway IPv6 Network IPv6Gateway
public 192.0.2.0/24 192.0.2.1 2001:db8:dead:beef::/64 2001:db8:dead:beef::1
private 10.0.1.0/24 - - -
gnt-network list-connected
Network Node Group Link
public nodegroup1 link100
public nodegroup2 link200
private nodegroup1 link50
gnt-network list-connected private
Network Node Group Link
private nodegroup1 link50
gnt-network info public
Name: public
IPv4 Network: 192.0.2.0/24
IPv4 Gateway: 192.0.2.1
IPv6 Network: 2001:db8:dead:beef::/64
IPv6 Gateway: 2001:db8:dead:beef::1
Connected to: nodegroup1 (link100), nodegroup2 (link200)
Total IPv4 count: 256
Free address count: 201 (80% free)
IPv4 pool status: XXX.........XXXXXXXXXXXXXX...XX.............
XXX..........XXX...........................X
....XXX..........XXX.....................XXX
X: occupied .: free
Used by 22 instances:
inst1
inst2
inst32
..
NIC "network" parameter
- "network" takes precedence over "link"
- manually setting "link" on a nic with existing "network" is not permitted
- as a safety guard, setting a "network" parameter on a nic with a "link" is only permitted if the network's link on the instance's node group is the same as the current nic's link
- "link" is updated on startup according to the network -> nodegroup mapping
Default nic "network" parameter add default "network" argument? How do we deal with transitions? -> network and link may not be set at the same time -> setting network will unset link and vice-versa -> setting network is only permitted iff:
- all NICs with a "default" link would result in having the same link right after setting "network".
- i.e.: for instance in all_instances:
- for nic in instance.nics:
- if nic.link == instance.primary_node.group.networks[network]:
- ...
- else:
- raise errors.OpPrereqError
IAllocator changes
- Make it network-aware, same as storage-aware
- Both, network and storage will act as constraints, i.e. "place me a node that has access to network x and storage pool y on the cluster". The iallocator will thus rule out node groups based on these constraints.
Helper methods in lib/config.py
- ConfigWriter.GetInstancesByNodeGroup(group_uuid)
- ConfigWriter.GetInstancesInfoByNodeGroup(group_uuid)