Network interfaces

List interfaces

List interface keys:

with NDB(log='on') as ndb:
    for key in ndb.interfaces:
        print(key)

NDB views support some dict methods: items(), values(), keys():

with NDB(log='on') as ndb:
    for key, nic in ndb.interfaces.items():
        nic.set('state', 'up')
        nic.commit()

Get interface objects

The keys may be used as selectors to get interface objects:

with NDB(log='on') as ndb:
    for key in ndb.interfaces:
        print(ndb.interfaces[key])

Also possible selector formats are dict() and simple string. The latter means the interface name:

eth0 = ndb.interfaces['eth0']

Dict selectors are necessary to get interfaces by other properties:

wrk1_eth0 = ndb.interfaces[{'target': 'worker1.sample.com',
                            'ifname': 'eth0'}]

wrk2_eth0 = ndb.interfaces[{'target': 'worker2.sample.com',
                            'address': '52:54:00:22:a1:b7'}]

Change nic properties

Changing MTU and MAC address:

with NDB(log='on') as ndb:
    with ndb.interfaces['eth0'] as eth0:
        eth0['mtu'] = 1248
        eth0['address'] = '00:11:22:33:44:55'
    # --> <-- eth0.commit() is called by the context manager
# --> <-- ndb.close() is called by the context manager

One can change a property either using the assignment statement, or using the .set() routine:

# same code
with NDB(log='on') as ndb:
    with ndb.interfaces['eth0'] as eth0:
        eth0.set('mtu', 1248)
        eth0.set('address', '00:11:22:33:44:55')

The .set() routine returns the object itself, that makes possible chain calls:

# same as above
with NDB(log='on') as ndb:
    with ndb.interfaces['eth0'] as eth0:
        eth0.set('mtu', 1248).set('address', '00:11:22:33:44:55')

# or
with NDB(log='on') as ndb:
    with ndb.interfaces['eth0'] as eth0:
        (eth0
         .set('mtu', 1248)
         .set('address', '00:11:22:33:44:55'))

# or without the context manager, call commit() explicitly
with NDB(log='on') as ndb:
    (ndb
     .interfaces['eth0']
     .set('mtu', 1248)
     .set('address', '00:11:22:33:44:55')
     .commit())

Create virtual interfaces

Create a bridge and add a port, eth0:

(ndb
 .interfaces
 .create(ifname='br0', kind='bridge')
 .commit())

(ndb
 .interfaces['eth0']
 .set('master', ndb.interfaces['br0']['index'])
 .commit())