# Master not discovered or elected yet, an election requires at least 2 nodes **URL:** \ **Category:** Elasticsearch\ **Created:** [December 31, 2019, 7:00am UTC](https://discuss.elastic.co/t/master-not-discovered-or-elected-yet-an-election-requires-at-least-2-nodes/213412 "2019-12-31T07:00:41Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![li-peng](https://avatars.discourse-cdn.com/v4/letter/l/e36b37/32.png) [@li-peng](https://discuss.elastic.co/u/li-peng)\ **Post date:** [January 2, 2020, 9:47am UTC](https://discuss.elastic.co/t/master-not-discovered-or-elected-yet-an-election-requires-at-least-2-nodes/213412/4 "2020-01-02T09:47:57Z")
I built a cluster of 3 nodes with elasticsearch-7.1 two weeks ago. my commnds : - ``` ./elasticsearch -E node.name=node1 -E cluster.name=my-app -E path.data=/datas/es7/node1_data -E path.logs=/logs/node1_log -d ``` - ``` ./elasticsearch -E node.name=node2 -E cluster.name=my-app -E path.data=/datas/es7/node2_data -E path.logs=/logs/node2_log -d ``` - ``` ./elasticsearch -E node.name=node3 -E cluster.name=my-app -E path.data=/es7/node3_data -E path.logs=/logs/node3_log -d ``` now,I shutdown all nodes, and I want to start the cluster with only one node : node1. Unfortunately , it failed.here is the log: ``` [2019-12-31T14:29:23,954][WARN][o.e.c.c.ClusterFormationFailureHelper] [node1] master not discovered or elected yet, an election requires at least 2 nodes with ids from [5e3LlD8QTHmGaJDhlKY-8w, cJyHBa9ATf-2vg8Tnt7KeQ, JHVEwFfkStOI6qG6QawqkA], have discovered [] which is not a quorum; discovery will continue using [127.0.0.1:9300, 127.0.0.1:9301, 127.0.0.1:9302, 127.0.0.1:9303, 127.0.0.1:9304] from hosts providers and [{node1}{JHVEwFfkStOI6qG6QawqkA}{tv4ieuTOQn6wW9fUGwNXzg}{172.21.0.1}{172.21.0.1:9300} {ml.machine_memory=3975200768, xpack.installed=true, ml.max_open_jobs=20}] from last-known cluster state; node term 8, last-accepted version 533 in term 8 ``` and my elasticsearch.yaml - ``` cluster.name: my-app ``` - ``` network.host: 0.0.0.0 ``` - ``` node.name: node1 ``` - ``` path.data: /datas/es7/node1_data ``` - ``` path.logs: /logs/es7/node1_log ``` and I try to set > cluster.initial\_master\_nodes: ["node1"] but it makes no difference . here is logs when I set logger.org.elasticsearch.discovery: TRACE ``` [2019-12-31T14:55:04,331][INFO][o.e.n.Node] [node1] starting ... [2019-12-31T14:55:04,468][INFO][o.e.t.TransportService] [node1] publish_address {172.21.0.1:9300}, bound_addresses {0.0.0.0:9300} [2019-12-31T14:55:04,479][INFO][o.e.b.BootstrapChecks] [node1] bound or publishing to a non-loopback address, enforcing bootstrap checks [2019-12-31T14:55:04,520][DEBUG][o.e.d.SeedHostsResolver] [node1] using max_concurrent_resolvers [10], resolver timeout [5s] [2019-12-31T14:55:04,520][INFO][o.e.c.c.Coordinator] [node1] cluster UUID [G4ku2BYQRIG-dHdIDQ7tvA] [2019-12-31T14:55:04,524][TRACE][o.e.d.PeerFinder] [node1] activating with nodes: {node1}{JHVEwFfkStOI6qG6QawqkA}{-FVunPWUSIGpB5ndu00tfw}{172.21.0.1}{172.21.0.1:9300}{ml.machine_memory=3975200768, xpack.installed=true, ml.max_open_jobs=20}, local [2019-12-31T14:55:04,525][TRACE][o.e.d.PeerFinder] [node1] probing master nodes from cluster state: nodes: {node1}{JHVEwFfkStOI6qG6QawqkA}{-FVunPWUSIGpB5ndu00tfw}{172.21.0.1}{172.21.0.1:9300}{ml.machine_memory=3975200768, xpack.installed=true, ml.max_open_jobs=20}, local [2019-12-31T14:55:04,525][TRACE][o.e.d.PeerFinder] [node1] startProbe(172.21.0.1:9300) not probing local node [2019-12-31T14:55:04,537][TRACE][o.e.d.SeedHostsResolver] [node1] resolved host [127.0.0.1] to [127.0.0.1:9300, 127.0.0.1:9301, 127.0.0.1:9302, 127.0.0.1:9303, 127.0.0.1:9304] [2019-12-31T14:55:04,538][TRACE][o.e.d.PeerFinder] [node1] probing resolved transport addresses [127.0.0.1:9300, 127.0.0.1:9301, 127.0.0.1:9302, 127.0.0.1:9303, 127.0.0.1:9304] [2019-12-31T14:55:04,539][TRACE][o.e.d.PeerFinder] [node1] Peer{transportAddress=127.0.0.1:9300, discoveryNode=null, peersRequestInFlight=false} attempting connection [2019-12-31T14:55:04,546][TRACE][o.e.d.PeerFinder] [node1] Peer{transportAddress=127.0.0.1:9301, discoveryNode=null, peersRequestInFlight=false} attempting connection [2019-12-31T14:55:04,546][TRACE][o.e.d.PeerFinder] [node1] Peer{transportAddress=127.0.0.1:9302, discoveryNode=null, peersRequestInFlight=false} attempting connection [2019-12-31T14:55:04,546][TRACE][o.e.d.PeerFinder] [node1] Peer{transportAddress=127.0.0.1:9303, discoveryNode=null, peersRequestInFlight=false} attempting connection [2019-12-31T14:55:04,549][TRACE][o.e.d.PeerFinder] [node1] Peer{transportAddress=127.0.0.1:9304, discoveryNode=null, peersRequestInFlight=false} attempting connection [2019-12-31T14:55:04,551][TRACE][o.e.d.HandshakingTransportAddressConnector] [node1] [connectToRemoteMasterNode[127.0.0.1:9303]] opening probe connection [2019-12-31T14:55:04,553][TRACE][o.e.d.HandshakingTransportAddressConnector] [node1] [connectToRemoteMasterNode[127.0.0.1:9300]] opening probe connection [2019-12-31T14:55:04,553][TRACE][o.e.d.HandshakingTransportAddressConnector] [node1] [connectToRemoteMasterNode[127.0.0.1:9302]] opening probe connection [2019-12-31T14:55:04,554][TRACE][o.e.d.HandshakingTransportAddressConnector] [node1] [connectToRemoteMasterNode[127.0.0.1:9301]] opening probe connection [2019-12-31T14:55:04,559][TRACE][o.e.d.HandshakingTransportAddressConnector] [node1] [connectToRemoteMasterNode[127.0.0.1:9304]] opening probe connection [2019-12-31T14:55:04,600][DEBUG][o.e.d.PeerFinder] [node1] Peer{transportAddress=127.0.0.1:9304, discoveryNode=null, peersRequestInFlight=false} connection failed org.elasticsearch.transport.ConnectTransportException: [][127.0.0.1:9304] connect_exception at org.elasticsearch.transport.TcpTransport$ChannelsConnectedListener.onFailure(TcpTransport.java:1299) ~[elasticsearch-7.1.0.jar:7.1.0] at org.elasticsearch.action.ActionListener.lambda$toBiConsumer$2(ActionListener.java:99) ~[elasticsearch-7.1.0.jar:7.1.0] at org.elasticsearch.common.concurrent.CompletableContext.lambda$addListener$0(CompletableContext.java:42) ~[elasticsearch-core-7.1.0.jar:7.1.0] at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760) ~[?:1.8.0_161] at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736) ~[?:1.8.0_161] at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) ~[?:1.8.0_161] at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977) ~[?:1.8.0_161] at org.elasticsearch.common.concurrent.CompletableContext.completeExceptionally(CompletableContext.java:57) ~[elasticsearch-core-7.1.0.jar:7.1.0] at org.elasticsearch.transport.netty4.Netty4TcpChannel.lambda$new$1(Netty4TcpChannel.java:72) ~[?:?] at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511) ~[?:?] at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:504) ~[?:?] at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:483) ~[?:?] at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424) ~[?:?] at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:121) ~[?:?] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:327) ~[?:?] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:343) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:556) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:510) ~[?:?] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470) ~[?:?] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) ~[?:?] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161] Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /127.0.0.1:9304 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[?:?] at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[?:?] at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:327) ~[?:?] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340) ~[?:?] ... 6 more Caused by: java.net.ConnectException: Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[?:?] at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[?:?] at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:327) ~[?:?] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340) ~[?:?] ... 6 more [2019-12-31T14:55:04,655][TRACE][o.e.d.HandshakingTransportAddressConnector] [node1] [connectToRemoteMasterNode[127.0.0.1:9300]] opened probe connection [2019-12-31T14:55:04,621][DEBUG][o.e.d.PeerFinder] [node1] Peer{transportAddress=127.0.0.1:9301, discoveryNode=null, peersRequestInFlight=false} connection failed org.elasticsearch.transport.ConnectTransportException: [][127.0.0.1:9301] connect_exception. ``` so ,waht can I do to start the cluster with only one node ? and why "an election requires at least 2 nodes" when i alreay set cluster.initial\_master\_nodes: ["node1"] Thanks --- _[View the full topic](https://discuss.elastic.co/t/master-not-discovered-or-elected-yet-an-election-requires-at-least-2-nodes/213412)._