1、Exception java.lang.RuntimeException: can not run elasticsearch as root

因為用root啟動而報錯，改用其他用戶重新啟動就可以了。

[2022-02-17T17:23:19,808][ERROR][o.e.b.Bootstrap ] [localhost..local] Exception java.lang.RuntimeException: can not run elasticsearch as rootat org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:103) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:183) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:358) [elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) [elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:157) [elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:77) [elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112) [elasticsearch-cli-8.0.0.jar:8.0.0]at org.elasticsearch.cli.Command.main(Command.java:77) [elasticsearch-cli-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:122) [elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80) [elasticsearch-8.0.0.jar:8.0.0] [2022-02-17T17:23:19,817][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [localhost..local] uncaught exception in thread [main] org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as rootat org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:157) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:77) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112) ~[elasticsearch-cli-8.0.0.jar:8.0.0]at org.elasticsearch.cli.Command.main(Command.java:77) ~[elasticsearch-cli-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:122) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80) ~[elasticsearch-8.0.0.jar:8.0.0] Caused by: java.lang.RuntimeException: can not run elasticsearch as rootat org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:103) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:183) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:358) ~[elasticsearch-8.0.0.jar:8.0.0]at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) ~[elasticsearch-8.0.0.jar:8.0.0]

2、[WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64440}

拒絕連接，就要看看什么原因導致的不連接，查看日志。

[2022-02-19T14:37:19,865][INFO ][o.e.n.Node ] [node-1] started [2022-02-19T14:37:19,980][INFO ][o.e.l.LicenseService ] [node-1] license [2921425f-8cbb-4a49-bc24-1e9f67ea0b2a] mode [basic] - valid [2022-02-19T14:37:19,981][INFO ][o.e.x.s.a.Realms ] [node-1] license mode is [basic], currently licensed security realms are [reserved/reserved,file/default_file,native/default_native] [2022-02-19T14:37:19,987][INFO ][o.e.g.GatewayService ] [node-1] recovered [2] indices into cluster_state [2022-02-19T14:37:20,327][INFO ][o.e.c.r.a.AllocationService] [node-1] current.health="GREEN" message="Cluster health status changed from [RED] to [GREEN] (reason: [shards started [[.security-7][0], [.geoip_databases][0]]])." previous.health="RED" reason="shards started [[.security-7][0], [.geoip_databases][0]]" [2022-02-19T14:37:20,727][INFO ][o.e.i.g.DatabaseNodeService] [node-1] successfully loaded geoip database file [GeoLite2-Country.mmdb] [2022-02-19T14:37:20,824][INFO ][o.e.i.g.DatabaseNodeService] [node-1] successfully loaded geoip database file [GeoLite2-ASN.mmdb] [2022-02-19T14:37:21,615][INFO ][o.e.i.g.DatabaseNodeService] [node-1] successfully loaded geoip database file [GeoLite2-City.mmdb] [2022-02-19T14:39:02,514][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64440} [2022-02-19T14:39:03,583][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64441} [2022-02-19T14:39:03,610][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64444} [2022-02-19T14:39:03,687][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64446} [2022-02-19T14:39:04,024][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64447} [2022-02-19T14:39:09,101][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64448} [2022-02-19T14:39:09,130][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64452} [2022-02-19T14:39:09,193][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64454} [2022-02-19T14:39:39,266][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64469} [2022-02-19T14:40:39,338][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:64506} {"@timestamp":"2022-02-19T06:50:14.180Z", "log.level": "WARN", "message":"received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/1.2.3.4:9200, remoteAddress=/1.2.3.4:50404}", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"elasticsearch.server","process.thread.name":"elasticsearch[node-1][transport_worker][T#8]","log.logger":"org.elasticsearch.xpack.security.transport.netty4.SecurityNetty4HttpServerTransport","elasticsearch.cluster.uuid":"prPqgk72QAalYvuHmOiaog","elasticsearch.node.id":"6KgKzmiVTHaGcr0Y3DzdGQ","elasticsearch.node.name":"node-1","elasticsearch.cluster.name":"my-application"}

ES（elasticsearch）已啟動成功但服務器IP卻打不開_m0_64295612的博客-CSDN博客https://blog.csdn.net/m0_64295612/article/details/123019551

3、warning: ignoring JAVA_HOME=/miao/openjdk-8u312-b07; using bundled JDK
jdk版本不合適，這就是我為啥不喜歡用openjdk。

[lin@localhost bin]$source ~/.bashrc [lin@localhost bin]$./elasticsearch -d warning: ignoring JAVA_HOME=/miao/openjdk-8u312-b07; using bundled JDK warning: ignoring JAVA_HOME=/miao/openjdk-8u312-b07; using bundled JDK

?

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