Calico的hostendpoint的IP地址为空，导致felix退出
目录
现象
calico2.5.1运行过程中突然panic，日志如下：
panic: interface conversion: interface is nil, not ip.Addr
goroutine 150 [running]:
github.com/projectcalico/felix/calc.(*EventSequencer).flushAddedIPSets.func1.1(0x0, 0x0)
/go/src/github.com/projectcalico/felix/calc/event_sequencer.go:498 +0x4e
github.com/projectcalico/felix/multidict.stringToIfaceMap.Iter(0xc42025ba40, 0xc4207914d0, 0x28, 0xc420d74020)
/go/src/github.com/projectcalico/felix/multidict/multidict.go:249 +0xd3
github.com/projectcalico/felix/calc.(*EventSequencer).flushAddedIPSets.func1(0x1505c00, 0xc4211fadf0, 0xc420761c08, 0x40eb82)
/go/src/github.com/projectcalico/felix/calc/event_sequencer.go:499 +0x237
github.com/projectcalico/felix/vendor/github.com/projectcalico/libcalico-go/lib/set.mapSet.Iter(0xc42025b9e0, 0xc421205f30)
/go/src/github.com/projectcalico/felix/vendor/github.com/projectcalico/libcalico-go/lib/set/set.go:102 +0xaf
github.com/projectcalico/felix/calc.(*EventSequencer).flushAddedIPSets(0xc42009d600)
/go/src/github.com/projectcalico/felix/calc/event_sequencer.go:507 +0x75
github.com/projectcalico/felix/calc.(*EventSequencer).Flush(0xc42009d600)
/go/src/github.com/projectcalico/felix/calc/event_sequencer.go:517 +0x4b
github.com/projectcalico/felix/calc.(*AsyncCalcGraph).maybeFlush(0xc420128c80)
/go/src/github.com/projectcalico/felix/calc/async_calc_graph.go:196 +0xe5
github.com/projectcalico/felix/calc.(*AsyncCalcGraph).loop(0xc420128c80)
/go/src/github.com/projectcalico/felix/calc/async_calc_graph.go:175 +0x2ab
created by github.com/projectcalico/felix/calc.(*AsyncCalcGraph).Start
/go/src/github.com/projectcalico/felix/calc/async_calc_graph.go:219 +0xe1
调查
打开debug:
...
- name: FELIX_LOGSEVERITYSCREEN
value: debug
...
找到以下日志：
2018-01-19 07:18:28.097 [DEBUG][3550] ipset_member_calc.go 153: IP set s:Z7rI3bnfRb7o_jW1QBo5SzZ9BMs5SEDCgMiEPg now matches IPs [<nil> <nil>] via HostEndpoint(node=10.39.1.48, name=eth0)
2018-01-19 07:18:28.097 [DEBUG][3550] ipset_member_calc.go 153: IP set s:Z7rI3bnfRb7o_jW1QBo5SzZ9BMs5SEDCgMiEPg now matches IPs [10.39.20.42 192.168.234.2] via HostEndpoint(node=paas-slave-20-42, name=eth0)
在ipset中添加Ip的时候，有一个hostendpoint的IP地址为两个nil：
calicoctl get hostendpoint --node=10.39.1.48 -o yaml
- apiVersion: v1
kind: hostEndpoint
metadata:
labels:
calico/k8s_ns: kube-system
name: eth0
node: 10.39.1.48
spec:
expectedIPs:
- ""
- ""
interfaceName: eth0
profiles:
- k8s_ns.kube-system
管理操作时，创建的hostendpoint的有错误，修改后恢复。
