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在测试具有三个节点的 Core Os 集群时，在成功添加和删除几个额外节点后，我遇到了以下问题，可能是由于 etcd 选举过程中的竞争条件。

检查新领导人给出：

$ curl -L http://127.0.0.1:4001/v2/stats/leader
{"errorCode":300,"message":"Raft Internal Error","index":629006}

集群中每台机器的 Journalctl 给出：

$ journalctl -r -u etcd
-- Logs begin at Wed 2014-11-12 15:09:01 UTC, end at Mon 2014-11-24 10:47:34 UTC. --
Nov 24 10:47:34 node-1 etcd[56576]: [etcd] Nov 24 10:47:34.307 INFO      | 965d12d38a4a4b2c807bd232fb7b0db7: term #5221 started.
Nov 24 10:47:34 node-1 etcd[56576]: [etcd] Nov 24 10:47:34.306 INFO      | 965d12d38a4a4b2c807bd232fb7b0db7: state changed from 'candidate' to 'follower'.
Nov 24 10:47:33 node-1 etcd[56576]: [etcd] Nov 24 10:47:33.098 INFO      | 965d12d38a4a4b2c807bd232fb7b0db7: state changed from 'follower' to 'candidate'.
Nov 24 10:47:32 node-1 etcd[56576]: [etcd] Nov 24 10:47:32.081 INFO      | 965d12d38a4a4b2c807bd232fb7b0db7: term #5219 started.
Nov 24 10:47:32 node-1 etcd[56576]: [etcd] Nov 24 10:47:32.081 INFO      | 965d12d38a4a4b2c807bd232fb7b0db7: state changed from 'candidate' to 'follower'.
Nov 24 10:47:31 node-1 etcd[56576]: [etcd] Nov 24 10:47:31.962 INFO      | 965d12d38a4a4b2c807bd232fb7b0db7: state changed from 'follower' to 'candidate'.

列出带有队列的机器失败：

$ fleetctl list-machines
2014/11/24 10:56:19 INFO client.go:278: Failed getting response from http://127.0.0.1:4001/: dial tcp 127.0.0.1:4001: connection refused
2014/11/24 10:56:19 ERROR client.go:200: Unable to get result for {Get /_coreos.com/fleet/machines}, retrying in 100ms
2014/11/24 10:56:19 INFO client.go:278: Failed getting response from http://127.0.0.1:4001/: dial tcp 127.0.0.1:4001: connection refused
2014/11/24 10:56:19 ERROR client.go:200: Unable to get result for {Get /_coreos.com/fleet/machines}, retrying in 200ms
2014/11/24 10:56:19 INFO client.go:278: Failed getting response from http://127.0.0.1:4001/: dial tcp 127.0.0.1:4001: connection refused

列出集群中的机器给出：

$ curl -L http://127.0.0.1:7001/v2/admin/machines
[{"name":"","state":"follower","clientURL":"http://100.72.62.35:4001","peerURL":"http://100.72.62.35:7001"},
{"name":"555cca74216644fea48990673b3d539c","state":"follower","clientURL":"http://100.72.62.59:4001","peerURL":"http://100.72.62.59:7001"},
{"name":"965d12d38a4a4b2c807bd232fb7b0db7","state":"follower","clientURL":"http://100.72.20.153:4001","peerURL":"http://100.72.20.153:7001"},
{"name":"a1b566dedb194c259f7eb2ffde5595b1","state":"follower","clientURL":"http://100.72.62.2:4001","peerURL":"http://100.72.62.2:7001"},
{"name":"a45efba827754b5f93c38b751a0ae273","state":"follower","clientURL":"http://100.72.62.31:4001","peerURL":"http://100.72.62.31:7001"},
{"name":"d041738235a9483cb814d37ca7fa4b6d","state":"follower","clientURL":"http://100.72.20.18:4001","peerURL":"http://100.72.20.18:7001"}]

但目前只有三台机器在运行。我试图添加额外的机器以达到法定人数但无济于事。我正在运行以下版本：

$ etcdctl -v  
etcdctl version 0.4.6

为此，正如这里提到的https://coreos.com/docs/distributed-configuration/etcd-api/#cluster-config，强制领导者的领导者模块已被删除。丑陋的部分是，由于没有法定人数，我无法从机器列表中删除当前未运行的机器，例如：

$ curl -L -XDELETE http://127.0.0.1:7001/v2/admin/machines/2abbf47a9e644bc69652a986d796d7a6

这没有效果。有什么方法可以保存集群吗？

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1 回答 1

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据我了解，您可以保存集群，但不值得。

集群不接受新机器，因为它需要法定人数来添加新机器，并且现有机器没有法定人数。删除机器和删除密钥也是如此。

如果您可以启动足够多的机器作为集群成员并让它们成功地作为集群成员工作，那么您将拥有一个仲裁并保存集群。

据我所知，您有六台机器列为集群成员。您需要至少运行四个才能使现有集群运行。

于 2015-05-06T22:18:17.393 回答