在centos linux 7.8.2003版上新安装elasticsearch和kibana
kibana服务显示器 Kibana server is not ready yet ```
curl http://localhost:5601
Kibana server is not ready yet

elasticsearch版本为：7.9.2

curl http://127.0.0.1:9200
{
"name" : "elkserver1",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "na",
"version" : {
"number" : "7.9.2",
"build_flavor" : "default",
"build_type" : "rpm",
"build_hash" : "d34da0ea4a966c4e49417f2da2f244e3e97b4e6e",
"build_date" : "2020-09-23T00:45:33.626720Z",
"build_snapshot" : false,
"lucene_version" : "8.6.2",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}

kibana版本

/usr/share/kibana/bin/kibana --version
7.9.2

服务处于活动状态，没有错误

systemctl status kibana
● kibana.service - Kibana
Loaded: loaded (/etc/systemd/system/kibana.service; disabled; vendor preset: disabled)
Active: active (running) since Sat 2020-09-26 12:46:17 EDT; 9s ago
Main PID: 22390 (node)
CGroup: /system.slice/kibana.service
└─22390 /usr/share/kibana/bin/../node/bin/node /usr/share/kibana/bin/../src/cli

Sep 26 12:46:17 elkserver1 systemd[1]: Started Kibana.
Sep 26 12:46:23 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:23Z","tags":["warning","plugins-discovery"],"pid":22390,"message":"Expect plugin "id" in camelCase, but found: beats_management"}
Sep 26 12:46:23 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:23Z","tags":["warning","plugins-discovery"],"pid":22390,"message":"Expect plugin "id" in camelCase, but found: triggers_actions_ui"}

network.host&http.port行未注解/etc/elasticsearch/elasticsearch.yml

cat /etc/elasticsearch/elasticsearch.yml | grep 'network.host|http.port'
network.host: localhost
http.port: 9200

elasticsearch.hosts在/etc/kibana/kibana.yml中没有注解

cat /etc/kibana/kibana.yml | grep 'elasticsearch.hosts'
elasticsearch.hosts: ["http://localhost:9200"]

防火墙已停止并禁用
kibana日志显示无法连接到elasticsearch。错误：30000ms后请求超时，但不确定导致此错误的原因。

journalctl --follow --unit kibana
-- Logs begin at Sat 2020-09-26 08:45:46 EDT. --
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["warning","plugins","encryptedSavedObjects","config"],"pid":22390,"message":"Generating a random key for xpack.encryptedSavedObjects.encryptionKey. To be able to decrypt encrypted saved objects attributes after restart, please set xpack.encryptedSavedObjects.encryptionKey in kibana.yml"}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["warning","plugins","ingestManager"],"pid":22390,"message":"Fleet APIs are disabled due to the Encrypted Saved Objects plugin using an ephemeral encryption key. Please set xpack.encryptedSavedObjects.encryptionKey in kibana.yml."}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["warning","plugins","actions","actions"],"pid":22390,"message":"APIs are disabled due to the Encrypted Saved Objects plugin using an ephemeral encryption key. Please set xpack.encryptedSavedObjects.encryptionKey in kibana.yml."}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["warning","plugins","alerts","plugins","alerting"],"pid":22390,"message":"APIs are disabled due to the Encrypted Saved Objects plugin using an ephemeral encryption key. Please set xpack.encryptedSavedObjects.encryptionKey in kibana.yml."}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["info","plugins","monitoring","monitoring"],"pid":22390,"message":"config sourced from: production cluster"}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["warning","plugins","monitoring","monitoring"],"pid":22390,"message":"X-Pack Monitoring Cluster Alerts will not be available: X-Pack plugin is not installed on the Elasticsearch cluster."}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["info","savedobjects-service"],"pid":22390,"message":"Waiting until all Elasticsearch nodes are compatible with Kibana before starting saved objects migrations..."}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["info","savedobjects-service"],"pid":22390,"message":"Starting saved objects migrations"}
Sep 26 12:46:35 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:46:35Z","tags":["warning","plugins","reporting","config"],"pid":22390,"message":"Chromium sandbox provides an additional layer of protection, but is not supported for Linux Centos 7.8.2003 OS. Automatically setting 'xpack.reporting.capture.browser.chromium.disableSandbox: true'."}
Sep 26 12:47:05 elkserver1 kibana[22390]: {"type":"log","@timestamp":"2020-09-26T16:47:05Z","tags":["warning","savedobjects-service"],"pid":22390,"message":"Unable to connect to Elasticsearch. Error: Request Timeout after 30000ms"}

有什么建议可以解决这个问题吗？