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Better interface selection heuristic #3546
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Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -5,6 +5,7 @@ import ( | |
"log" | ||
"net" | ||
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sockaddr "github.com/hashicorp/go-sockaddr" | ||
"github.com/hashicorp/nomad/client/config" | ||
"github.com/hashicorp/nomad/nomad/structs" | ||
) | ||
|
@@ -167,47 +168,25 @@ func (f *NetworkFingerprint) createNetworkResources(throughput int, intf *net.In | |
return nwResources, nil | ||
} | ||
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// Checks if the device is marked UP by the operator | ||
func (f *NetworkFingerprint) isDeviceEnabled(intf *net.Interface) bool { | ||
return intf.Flags&net.FlagUp != 0 | ||
} | ||
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// Checks if the device has any IP address configured | ||
func (f *NetworkFingerprint) deviceHasIpAddress(intf *net.Interface) bool { | ||
addrs, err := f.interfaceDetector.Addrs(intf) | ||
return err == nil && len(addrs) != 0 | ||
} | ||
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func (n *NetworkFingerprint) isDeviceLoopBackOrPointToPoint(intf *net.Interface) bool { | ||
return intf.Flags&(net.FlagLoopback|net.FlagPointToPoint) != 0 | ||
} | ||
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// Returns the interface with the name passed by user | ||
// If the name is blank then it iterates through all the devices | ||
// and finds one which is routable and marked as UP | ||
// It excludes PPP and lo devices unless they are specifically asked | ||
// Returns the interface with the name passed by user. If the name is blank, we | ||
// use the interface attached to the default route. | ||
func (f *NetworkFingerprint) findInterface(deviceName string) (*net.Interface, error) { | ||
var interfaces []net.Interface | ||
var err error | ||
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if deviceName != "" { | ||
return f.interfaceDetector.InterfaceByName(deviceName) | ||
} | ||
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var intfs []net.Interface | ||
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if intfs, err = f.interfaceDetector.Interfaces(); err != nil { | ||
return nil, err | ||
} | ||
// If we aren't given a device, look it up by using the interface with the default route | ||
if deviceName == "" { | ||
ri, err := sockaddr.NewRouteInfo() | ||
if err != nil { | ||
return nil, err | ||
} | ||
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for _, intf := range intfs { | ||
if f.isDeviceEnabled(&intf) && !f.isDeviceLoopBackOrPointToPoint(&intf) && f.deviceHasIpAddress(&intf) { | ||
interfaces = append(interfaces, intf) | ||
defaultIfName, err := ri.GetDefaultInterfaceName() | ||
if err != nil { | ||
return nil, err | ||
} | ||
if defaultIfName == "" { | ||
return nil, fmt.Errorf("no network_interface given and failed to determine interface attached to default route") | ||
} | ||
deviceName = defaultIfName | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Much nicer now 👍 |
||
} | ||
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if len(interfaces) == 0 { | ||
return nil, nil | ||
} | ||
return &interfaces[0], nil | ||
return f.interfaceDetector.InterfaceByName(deviceName) | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -49,11 +49,12 @@ client { | |
- `meta` `(map[string]string: nil)` - Specifies a key-value map that annotates | ||
with user-defined metadata. | ||
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- `network_interface` `(string: "lo | lo0")` - Specifies the name of the | ||
interface to force network fingerprinting on. This defaults to the loopback | ||
interface. All addresses on the interface are fingerprinted except the ones | ||
which are scoped local for IPv6. When allocating ports for tasks, the | ||
scheduler will choose from the IPs of the fingerprinted interface. | ||
- `network_interface` `(string: varied)` - Specifies the name of the interface | ||
to force network fingerprinting on. When run in dev mode, this is defaulted | ||
to the machine's loopback interface. If not in dev mode, the interface attached | ||
to the default route is used. All addresses on the interface are fingerprinted | ||
except those that are scoped local for IPv6. When allocating ports for tasks, | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. suggesting a small rewrite for brevity and continuity.
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the scheduler will choose from the IPs of the fingerprinted interface. | ||
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- `network_speed` `(int: 0)` - Specifies an override for the network link speed. | ||
This value, if set, overrides any detected or defaulted link speed. Most | ||
|
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🤔 We could
WARN
andcontinue
here, but after peeking at theAddrs(...)
code it seems like all of the errors it returns indicate pretty bad syscall failures. Seems like just bailing is probably safest as users can manually set this anyway.