Kube-DNS不起作用
我通过docker – multinode来设置k8s
$ https_proxy=http://10.25.30.127:7777 IP_ADDRESS=10.25.24.116 MASTER_IP=10.25.30.127 ./worker.sh +++ [0828 15:38:35] K8S_VERSION is set to: v1.3.6 +++ [0828 15:38:35] ETCD_VERSION is set to: 3.0.4 +++ [0828 15:38:35] FLANNEL_VERSION is set to: v0.6.1 +++ [0828 15:38:35] FLANNEL_IPMASQ is set to: true +++ [0828 15:38:35] FLANNEL_NETWORK is set to: 10.1.0.0/16 +++ [0828 15:38:35] FLANNEL_BACKEND is set to: udp +++ [0828 15:38:35] RESTART_POLICY is set to: unless-stopped +++ [0828 15:38:35] MASTER_IP is set to: 10.25.30.127 +++ [0828 15:38:35] ARCH is set to: amd64 +++ [0828 15:38:35] IP_ADDRESS is set to: 10.25.24.116 +++ [0828 15:38:35] USE_CNI is set to: false +++ [0828 15:38:35] -------------------------------------------- +++ [0828 15:38:35] Killing all kubernetes containers... +++ [0828 15:38:35] Launching docker bootstrap... +++ [0828 15:38:36] Launching flannel... b70f4cc14aac8315740a916fae459d0b354280d97d8da743c67e9e692beea601 +++ [0828 15:38:37] FLANNEL_SUBNET is set to: 10.1.102.1/24 +++ [0828 15:38:37] FLANNEL_MTU is set to: 1472 $ k cluster-info Kubernetes master is running at http://10.25.30.127:8080 KubeDNS is running at http://10.25.30.127:8080/api/v1/proxy/namespaces/kube-system/services/kube-dns kubernetes-dashboard is running at http://10.25.30.127:8080/api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard $ k get nodes NAME STATUS AGE 10.25.17.232 Ready 9h 10.25.19.197 Ready 3h 10.25.24.116 Ready 7h 139.1.1.1 Ready 9h DNS正常启动
$ k logs kube-dns-v17.1-qaygj -c kubedns --namespace=kube-system |head -50 I0828 04:49:14.079474 1 server.go:91] Using https://10.0.0.1:443 for kubernetes master I0828 04:49:14.081339 1 server.go:92] Using kubernetes API <nil> I0828 04:49:14.081923 1 server.go:132] Starting SkyDNS server. Listening on port:10053 I0828 04:49:14.082071 1 server.go:139] skydns: metrics enabled on :/metrics I0828 04:49:14.082181 1 dns.go:166] Waiting for service: default/kubernetes I0828 04:49:14.082462 1 logs.go:41] skydns: ready for queries on cluster.local. for tcp://0.0.0.0:10053 [rcache 0] I0828 04:49:14.082607 1 logs.go:41] skydns: ready for queries on cluster.local. for udp://0.0.0.0:10053 [rcache 0] I0828 04:49:14.480396 1 server.go:101] Setting up Healthz Handler(/readiness, /cache) on port :8081 I0828 04:49:14.483012 1 dns.go:660] DNS Record:&{10.0.0.1 0 10 10 false 30 0 }, hash:24c3d825 I0828 04:49:14.483065 1 dns.go:660] DNS Record:&{kubernetes.default.svc.cluster.local. 443 10 10 false 30 0 }, hash:c3f6ae26 I0828 04:49:14.483115 1 dns.go:660] DNS Record:&{kubernetes.default.svc.cluster.local. 0 10 10 false 30 0 }, hash:b9b7d845 I0828 04:49:14.483160 1 dns.go:660] DNS Record:&{10.0.0.24 0 10 10 false 30 0 }, hash:d8b58e70 I0828 04:49:14.483194 1 dns.go:660] DNS Record:&{kubernetes-dashboard.kube-system.svc.cluster.local. 0 10 10 false 30 0 }, hash:529066a8 I0828 04:49:14.483237 1 dns.go:660] DNS Record:&{10.0.0.10 0 10 10 false 30 0 }, hash:2d9aa69 I0828 04:49:14.483266 1 dns.go:660] DNS Record:&{kube-dns.kube-system.svc.cluster.local. 53 10 10 false 30 0 }, hash:fdbb4e78 I0828 04:49:14.483309 1 dns.go:660] DNS Record:&{kube-dns.kube-system.svc.cluster.local. 53 10 10 false 30 0 }, hash:fdbb4e78 I0828 04:49:14.483337 1 dns.go:660] DNS Record:&{kube-dns.kube-system.svc.cluster.local. 0 10 10 false 30 0 }, hash:d1247c4e I0828 04:49:16.678334 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:49:16.678405 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:49:16.777991 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:49:16.778100 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:49:16.778886 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:49:46.778352 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:49:46.778406 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:49:46.778932 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:50:16.879611 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:50:16.879685 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:50:16.880274 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:50:16.880332 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:50:16.880900 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:50:46.878037 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:50:46.878094 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:50:46.978007 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:51:16.778397 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:51:16.778455 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:51:16.779062 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:51:16.779110 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:51:16.779588 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:51:46.778319 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:51:46.778374 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:51:46.779048 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:52:16.878240 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:52:16.878309 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:52:16.878848 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:52:16.878886 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:52:16.977642 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:52:46.678628 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false I0828 04:52:46.678685 1 dns.go:539] records:[0xc820356af0], retval:[{10.0.0.1 0 10 10 false 30 0 /skydns/local/cluster/svc/default/kubernetes/3234633364383235}], path:[local cluster svc default kubernetes] I0828 04:52:46.878096 1 dns.go:583] Received ReverseRecord Request:1.0.0.10.in-addr.arpa. I0828 04:53:16.679056 1 dns.go:439] Received DNS Request:kubernetes.default.svc.cluster.local., exact:false
当我启动留言簿时，我注意到了dns日志
I0828 14:39:07.977746 1 dns.go:660] DNS Record:&{redis-master.default.svc.cluster.local. 0 10 10 false 30 0 }, hash:606d0bd5 I0828 14:39:14.178122 1 dns.go:660] DNS Record:&{10.0.0.147 0 10 10 false 30 0 }, hash:e8b710be I0828 14:39:14.178212 1 dns.go:660] DNS Record:&{myapp.default.svc.cluster.local. 0 10 10 false 30 0 }, hash:2077e618 I0828 14:39:14.178254 1 dns.go:660] DNS Record:&{10.0.0.145 0 10 10 false 30 0 }, hash:d93e9f2c I0828 14:39:14.178296 1 dns.go:660] DNS Record:&{redis-master.default.svc.cluster.local. 0 10 10 false 30 0 }, hash:606d0bd5 I0828 14:39:14.178336 1 dns.go:660] DNS Record:&{10.0.0.171 0 10 10 false 30 0 }, hash:cb7a4915 I0828 14:39:14.178364 1 dns.go:660] DNS Record:&{redis-slave.default.svc.cluster.local. 0 10 10 false 30 0 }, hash:ff7d45d8 I0828 14:39:14.178404 1 dns.go:660] DNS Record:&{10.0.0.139 0 10 10 false 30 0 }, hash:9afc24c9 I0828 14:39:14.178431 1 dns.go:660] DNS Record:&{guestbook.default.svc.cluster.local. 0 10 10 false 30 0 }, hash:78248924 I0828 14:39:14.178456 1 dns.go:660] DNS Record:&{10.0.0.1 0 10 10 false 30 0 }, hash:24c3d825 I0828 14:39:14.178513 1 dns.go:660] DNS Record:&{kubernetes.default.svc.cluster.local. 443 10 10 false 30 0 }, hash:c3f6ae26
但DNS查找不起作用
留言信息报告
PANIC: dial tcp: lookup redis-master on 10.0.0.10:53: read udp 10.1.102.2:46755->10.0.0.10:53: i/o timeout goroutine 277 [running]: github.com/codegangsta/negroni.(*Recovery).ServeHTTP.func1(0x7f1d98e5ba90, 0xc820323580, 0xc8200b8ec0) /go/src/github.com/codegangsta/negroni/recovery.go:34 +0xe9 panic(0x7a8c60, 0xc820327ae0)
留言环境页面
{ "GUESTBOOK_PORT": "tcp://10.0.0.139:3000", "GUESTBOOK_PORT_3000_TCP": "tcp://10.0.0.139:3000", "GUESTBOOK_PORT_3000_TCP_ADDR": "10.0.0.139", "GUESTBOOK_PORT_3000_TCP_PORT": "3000", "GUESTBOOK_PORT_3000_TCP_PROTO": "tcp", "GUESTBOOK_SERVICE_HOST": "10.0.0.139", "GUESTBOOK_SERVICE_PORT": "3000", "HOME": "/", "HOSTNAME": "guestbook-advba", "KUBERNETES_PORT": "tcp://10.0.0.1:443", "KUBERNETES_PORT_443_TCP": "tcp://10.0.0.1:443", "KUBERNETES_PORT_443_TCP_ADDR": "10.0.0.1", "KUBERNETES_PORT_443_TCP_PORT": "443", "KUBERNETES_PORT_443_TCP_PROTO": "tcp", "KUBERNETES_SERVICE_HOST": "10.0.0.1", "KUBERNETES_SERVICE_PORT": "443", "KUBERNETES_SERVICE_PORT_HTTPS": "443", "MYAPP_PORT": "tcp://10.0.0.147:8765", "MYAPP_PORT_8765_TCP": "tcp://10.0.0.147:8765", "MYAPP_PORT_8765_TCP_ADDR": "10.0.0.147", "MYAPP_PORT_8765_TCP_PORT": "8765", "MYAPP_PORT_8765_TCP_PROTO": "tcp", "MYAPP_SERVICE_HOST": "10.0.0.147", "MYAPP_SERVICE_PORT": "8765", "PATH": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "REDIS_MASTER_PORT": "tcp://10.0.0.35:6379", "REDIS_MASTER_PORT_6379_TCP": "tcp://10.0.0.35:6379", "REDIS_MASTER_PORT_6379_TCP_ADDR": "10.0.0.35", "REDIS_MASTER_PORT_6379_TCP_PORT": "6379", "REDIS_MASTER_PORT_6379_TCP_PROTO": "tcp", "REDIS_MASTER_SERVICE_HOST": "10.0.0.35", "REDIS_MASTER_SERVICE_PORT": "6379", "REDIS_SLAVE_PORT": "tcp://10.0.0.171:6379", "REDIS_SLAVE_PORT_6379_TCP": "tcp://10.0.0.171:6379", "REDIS_SLAVE_PORT_6379_TCP_ADDR": "10.0.0.171", "REDIS_SLAVE_PORT_6379_TCP_PORT": "6379", "REDIS_SLAVE_PORT_6379_TCP_PROTO": "tcp", "REDIS_SLAVE_SERVICE_HOST": "10.0.0.171", "REDIS_SLAVE_SERVICE_PORT": "6379" }
我也尝试在dns pod中解决
$ k get svc --namespace=kube-system NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE kube-dns 10.0.0.10 <none> 53/UDP,53/TCP 10h kubernetes-dashboard 10.0.0.24 <none> 80/TCP 10h $ k exec -it kube-dns-v17.1-qaygj -c kubedns --namespace=kube-system -- /bin/sh / # nslookup redis-master Server: 10.143.22.118 Address 1: 10.143.22.118 nslookup: can't resolve 'redis-master' / # nslookup baidu.com Server: 10.143.22.118 Address 1: 10.143.22.118 Name: baidu.com Address 1: 111.13.101.208 Address 2: 220.181.57.217 Address 3: 123.125.114.144 Address 4: 180.149.132.47 / # nslookup redis-master 10.0.0.10 Server: 10.0.0.10 Address 1: 10.0.0.10 kube-dns.kube-system.svc.cluster.local nslookup: can't resolve 'redis-master' / # nslookup baidu.com 10.0.0.10 Server: 10.0.0.10 Address 1: 10.0.0.10 kube-dns.kube-system.svc.cluster.local Name: baidu.com Address 1: 123.125.114.144 Address 2: 180.149.132.47 Address 3: 111.13.101.208 Address 4: 220.181.57.217
为什么kube-dns不能正常工作？
这个问题是由IP冲突引起的，提供者使用10作为内部networking，docker-multinode使用10/8作为默认簇IP范围，然后有东西被连线。
这就是我所做的
- 复制容器外的/ etc / kubernetes
- 将
/etc/kubernetes/master-multi/master-multi.json10.0.0.1replace为172.16.0.1 -
将
/etc/kubernetes/master-multi/addon-manager.json中的addon卷更改为{“name”：“addons”，“hostPath”：{“path”：“/ path / to / you / own / etc / kubernetes /”}}
-
将
clusterIP中的/etc/kubernetes/addon/skydns-svc.yaml更改为172.16.0.10 - 将
--cluster-dns=10.0.0.10所有--cluster-dns=10.0.0.10common.sh为--cluster-dns=172.16.0.10 - 在
common.sh添加-v /path/to/you/own/etc/kubernetes/:/etc/kubernetes/ \到common.sh - 然后
FLANNEL_IPMASQ=false FLANNEL_NETWORK=172.16.0.0/16 ./master.sh - 完成
我还为kube-deploy kube-deploy＃215添加了一个问题
你能检查一下kube-proxy是否正常运行？ 看起来像kube-dns服务有连接问题。
你可以通过kubectl get pods --namespace=kube-system和iptables-save来检查状态。