# Write and flush on the network layer failed **URL:** \ **Category:** Elasticsearch\ **Created:** [February 15, 2018, 1:54am UTC](https://discuss.elastic.co/t/write-and-flush-on-the-network-layer-failed/119897 "2018-02-15T01:54:30Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![bladerunner512](https://avatars.discourse-cdn.com/v4/letter/b/b77776/32.png) [@bladerunner512](https://discuss.elastic.co/u/bladerunner512)\ **Post date:** [February 15, 2018, 1:54am UTC](https://discuss.elastic.co/t/write-and-flush-on-the-network-layer-failed/119897/1 "2018-02-15T01:54:30Z")
Unable to get Docker ELK cluster working with 2 hosts. Both hosts have same response: user01@dcw0970:~/docker-elk-master$ docker logs dockerelkmaster\_elasticsearch\_1 [2018-02-15T01:33:13,054][INFO][o.e.n.Node] [896e8523da84] initializing ... [2018-02-15T01:33:13,123][INFO][o.e.e.NodeEnvironment] [896e8523da84] using [1] data paths, mounts [[/ (none)]], net usable\_space [5.2gb], net total\_space [7.3gb], types [aufs] [2018-02-15T01:33:13,123][INFO][o.e.e.NodeEnvironment] [896e8523da84] heap size [989.8mb], compressed ordinary object pointers [true] [2018-02-15T01:33:13,125][INFO][o.e.n.Node] [896e8523da84] node name [896e8523da84], node ID [lXvb0g0PT1qKX9i7h8DvcA] [2018-02-15T01:33:13,125][INFO][o.e.n.Node] [896e8523da84] version[6.0.0], pid[1], build[8f0685b/2017-11-10T18:41:22.859Z], OS[Linux/4.4.0-98-generic/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/1.8.0\_151/25.151-b12] [2018-02-15T01:33:13,125][INFO][o.e.n.Node] [896e8523da84] JVM arguments [-Xms1g, -Xmx1g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -XX:+HeapDumpOnOutOfMemoryError, -Des.cgroups.hierarchy.override=/, -Xmx1g, -Xms1g, -Des.path.home=/usr/share/elasticsearch, -Des.path.conf=/usr/share/elasticsearch/config] [2018-02-15T01:33:13,839][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [aggs-matrix-stats] [2018-02-15T01:33:13,839][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [analysis-common] [2018-02-15T01:33:13,839][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [ingest-common] [2018-02-15T01:33:13,839][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [lang-expression] [2018-02-15T01:33:13,839][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [lang-mustache] [2018-02-15T01:33:13,839][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [lang-painless] [2018-02-15T01:33:13,839][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [parent-join] [2018-02-15T01:33:13,840][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [percolator] [2018-02-15T01:33:13,840][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [reindex] [2018-02-15T01:33:13,840][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [repository-url] [2018-02-15T01:33:13,840][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [transport-netty4] [2018-02-15T01:33:13,840][INFO][o.e.p.PluginsService] [896e8523da84] loaded module [tribe] [2018-02-15T01:33:13,840][INFO][o.e.p.PluginsService] [896e8523da84] loaded plugin [ingest-geoip] [2018-02-15T01:33:13,840][INFO][o.e.p.PluginsService] [896e8523da84] loaded plugin [ingest-user-agent] [2018-02-15T01:33:14,877][INFO][o.e.d.DiscoveryModule] [896e8523da84] using discovery type [zen] [2018-02-15T01:33:15,331][INFO][o.e.n.Node] [896e8523da84] initialized [2018-02-15T01:33:15,331][INFO][o.e.n.Node] [896e8523da84] starting ... [2018-02-15T01:33:15,537][INFO][o.e.t.TransportService] [896e8523da84] publish\_address {xx.xxx.xx.248:9300}, bound\_addresses {0.0.0.0:9300} [2018-02-15T01:33:15,547][INFO][o.e.b.BootstrapChecks] [896e8523da84] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks [2018-02-15T01:33:15,622][WARN][o.e.t.n.Netty4Transport] [896e8523da84] write and flush on the network layer failed (channel: [id: 0xace1b77f, L:0.0.0.0/0.0.0.0:59142 ! R:dcw0970.dev.elk.com/xx.xxx.xx.248:9200]) java.nio.channels.ClosedChannelException: null at io.netty.channel.AbstractChannel$AbstractUnsafe.write(...)(Unknown Source) ~[?:?] [2018-02-15T01:33:16,576][WARN][o.e.t.n.Netty4Transport] [896e8523da84] write and flush on the network layer failed (channel: [id: 0xa1107c7c, L:0.0.0.0/0.0.0.0:59148 ! R:dcw0970.dev.elk.com/xx.xxx.xx.248:9200]) java.nio.channels.ClosedChannelException: null at io.netty.channel.AbstractChannel$AbstractUnsafe.write(...)(Unknown Source) ~[?:?] [2018-02-15T01:33:17,577][WARN][o.e.t.n.Netty4Transport] [896e8523da84] write and flush on the network layer failed (channel: [id: 0xb3e960d8, L:0.0.0.0/0.0.0.0:59156 ! R:dcw0970.dev.elk.com/xx.xxx.xx.248:9200]) java.nio.channels.ClosedChannelException: null at io.netty.channel.AbstractChannel$AbstractUnsafe.write(...)(Unknown Source) ~[?:?] [2018-02-15T01:33:18,596][INFO][o.e.c.s.MasterService] [896e8523da84] zen-disco-elected-as-master ([0] nodes joined), reason: new\_master {896e8523da84}{lXvb0g0PT1qKX9i7h8DvcA}{i1QPfGm0SFi2kueAG9NBqw}{xx.xxx.xx.248}{xx.xxx.xx.248:9300} [2018-02-15T01:33:18,608][INFO][o.e.c.s.ClusterApplierService] [896e8523da84] new\_master {896e8523da84}{lXvb0g0PT1qKX9i7h8DvcA}{i1QPfGm0SFi2kueAG9NBqw}{xx.xxx.xx.248}{xx.xxx.xx.248:9300}, reason: apply cluster state (from master [master {896e8523da84}{lXvb0g0PT1qKX9i7h8DvcA}{i1QPfGm0SFi2kueAG9NBqw}{xx.xxx.xx.248}{xx.xxx.xx.248:9300} committed version [1] source [zen-disco-elected-as-master ([0] nodes joined)]]) [2018-02-15T01:33:18,621][INFO][o.e.h.n.Netty4HttpServerTransport] [896e8523da84] publish\_address {xx.xxx.xx.248:9200}, bound\_addresses {0.0.0.0:9200} [2018-02-15T01:33:18,621][INFO][o.e.n.Node] [896e8523da84] started [2018-02-15T01:33:18,628][INFO][o.e.g.GatewayService] [896e8523da84] recovered [0] indices into cluster\_state elasticsearch.yml: node.name: ${HOSTNAME} cluster.name: "docker-dev-elk" network.host: 0.0.0.0 network.publish\_host: xx.xxx.xx.248 discovery.zen.minimum\_master\_nodes: 2 gateway.expected\_nodes: 2 gateway.recover\_after\_time: 5m gateway.recover\_after\_nodes: 2 discovery.zen.ping.unicast.hosts: -dcw0970.dev.elk.com:9200 -dcw0971.dev.elk.com:9200 Both hosts have green status: { "cluster\_name": "docker-dev-elk", "status": "green", "timed\_out": false, "number\_of\_nodes": 1, "number\_of\_data\_nodes": 1, "active\_primary\_shards": 0, "active\_shards": 0, "relocating\_shards": 0, "initializing\_shards": 0, "unassigned\_shards": 0, "delayed\_unassigned\_shards": 0, "number\_of\_pending\_tasks": 0, "number\_of\_in\_flight\_fetch": 0, "task\_max\_waiting\_in\_queue\_millis": 0, "active\_shards\_percent\_as\_number": 100 } ---
**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\ **Post date:** [February 15, 2018, 6:23am UTC](https://discuss.elastic.co/t/write-and-flush-on-the-network-layer-failed/119897/2 "2018-02-15T06:23:27Z")
Elasticsearch use port 9300 to communicate between nodes, so you need to change the port number from 9200 to 9300 for unicast hosts in your config. ---
**Author:** ![bladerunner512](https://avatars.discourse-cdn.com/v4/letter/b/b77776/32.png) [@bladerunner512](https://discuss.elastic.co/u/bladerunner512)\ **Post date:** [February 15, 2018, 3:05pm UTC](https://discuss.elastic.co/t/write-and-flush-on-the-network-layer-failed/119897/3 "2018-02-15T15:05:02Z")
Thanks. Not sure how I missed that, but works great. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [March 15, 2018, 3:05pm UTC](https://discuss.elastic.co/t/write-and-flush-on-the-network-layer-failed/119897/4 "2018-03-15T15:05:02Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.