我已经在RHEL7上安装了ES 7.5和Kibana 7.5，但是在启动Kibana并检查UI后，我看到了错误，“ Kibana服务器尚未准备好。”

检查Kibana日志，我发现它没有正确连接到ES。任何帮助表示赞赏！

这是 journalctl –unit kibana 的输出：

Dec 11 10:03:05 mcjca033031 systemd[1]: kibana.service holdoff time over, scheduling restart.
Dec 11 10:03:05 mcjca033031 systemd[1]: Started Kibana.
Dec 11 10:03:05 mcjca033031 systemd[1]: Starting Kibana...
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins-system"],"pid":5320,"message":"Setting up [15] plugins: [security,licensing,code,timelion,features,spaces,translation
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","security"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["warning","plugins","security","config"],"pid":5320,"message":"Generating a random key for xpack.security.encryptionKey. To prevent s
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["warning","plugins","security","config"],"pid":5320,"message":"Session cookies will be transmitted over insecure connections. This is
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","licensing"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","code"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","timelion"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","features"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","spaces"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","translations"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:08 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:08Z","tags":["info","plugins","data"],"pid":5320,"message":"Setting up plugin"}
Dec 11 10:03:13 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:13Z","tags":["warning","legacy-plugins"],"pid":5320,"path":"/usr/share/kibana/src/legacy/core_plugins/visualizations","message":"Skipping non-plug
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["warning","plugins","licensing"],"pid":5320,"message":"License information could not be obtained from Elasticsearch for the [data] cl
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins-system"],"pid":5320,"message":"Starting [8] plugins: [security,licensing,code,timelion,features,spaces,translations,d
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","migrations"],"pid":5320,"message":"Creating index .kibana_task_manager_1."}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","migrations"],"pid":5320,"message":"Creating index .kibana_1."}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["warning","migrations"],"pid":5320,"message":"Unable to connect to Elasticsearch. Error: [mapper_parsing_exception] No handler for ty
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["fatal","root"],"pid":5320,"message":"{ Error: [mapper_parsing_exception] No handler for type [flattened] declared on field [state]\n
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins-system"],"pid":5320,"message":"Stopping all plugins."}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","data"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","translations"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","spaces"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","features"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","timelion"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","code"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","licensing"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: {"type":"log","@timestamp":"2019-12-11T15:03:14Z","tags":["info","plugins","security"],"pid":5320,"message":"Stopping plugin"}
Dec 11 10:03:14 mcjca033031 kibana[5320]: FATAL  [mapper_parsing_exception] No handler for type [flattened] declared on field [state] :: {"path":"/.kibana_1","query":{},"body":"{\"mappings\":{\"dynamic\":\"strict\",\"properties\":{\"
Dec 11 10:03:14 mcjca033031 kibana[5320]: \":{\"type\":\"geo_shape\"},\"mapStateJSON\":{\"type\":\"text\"},\"layerListJSON\":{\"type\":\"text\"},\"uiStateJSON\":{\"type\":\"text\"}}},\"maps-telemetry\":{\"properties\":{\"mapsTotalCou
Dec 11 10:03:14 mcjca033031 kibana[5320]: \":\"keyword\"},\"color\":{\"type\":\"keyword\"},\"label\":{\"type\":\"keyword\"}}},\"limit\":{\"type\":\"integer\"},\"groupBy\":{\"type\":\"keyword\"},\"filterQuery\":{\"type\":\"keyword\"},
Dec 11 10:03:14 mcjca033031 kibana[5320]: displayValue\":{\"type\":\"text\"},\"operator\":{\"type\":\"text\"}}},\"and\":{\"properties\":{\"id\":{\"type\":\"keyword\"},\"name\":{\"type\":\"text\"},\"enabled\":{\"type\":\"boolean\"},\"
Dec 11 10:03:14 mcjca033031 kibana[5320]: \":\"long\",\"null_value\":0},\"cluster\":{\"type\":\"long\",\"null_value\":0},\"indices\":{\"type\":\"long\",\"null_value\":0}}},\"ui_reindex\":{\"properties\":{\"close\":{\"type\":\"long\",
Dec 11 10:03:14 mcjca033031 kibana[5320]: t\"},\"hits\":{\"type\":\"integer\"},\"kibanaSavedObjectMeta\":{\"properties\":{\"searchSourceJSON\":{\"type\":\"text\"}}},\"sort\":{\"type\":\"keyword\"},\"title\":{\"type\":\"text\"},\"vers
Dec 11 10:03:14 mcjca033031 kibana[5320]: },\"timelion_sheet\":{\"type\":\"text\"},\"title\":{\"type\":\"text\"},\"version\":{\"type\":\"integer\"}}},\"ui-metric\":{\"properties\":{\"count\":{\"type\":\"integer\"}}}},\"_meta\":{\"mig
Dec 11 10:03:14 mcjca033031 kibana[5320]: ",\"sample-data-telemetry\":\"7d3cfeb915303c9641c59681967ffeb4\",\"telemetry\":\"358ffaa88ba34a97d55af0933a117de4\",\"timelion-sheet\":\"9a2a2748877c7a7b582fef201ab1d4cf\",\"ui-metric\":\"0d4
Dec 11 10:03:15 mcjca033031 systemd[1]: kibana.service: main process exited, code=exited, status=1/FAILURE
Dec 11 10:03:15 mcjca033031 systemd[1]: Unit kibana.service entered failed state.
Dec 11 10:03:15 mcjca033031 systemd[1]: kibana.service failed.

Elasticsearch.yml

# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
#       Before you set out to tweak and tune the configuration, make sure you
#       understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
cluster.name: elasticsearchcluster
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: mcjca033078
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
path.data: /var/lib/elasticsearch
#
# Path to log files:
#
path.logs: /var/log/elasticsearch
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 11.208.33.78
#
# Set a custom port for HTTP:
#
http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when this node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
discovery.seed_hosts: ["mcjca033078", "mcjca032215", "mcjca032254"]
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
cluster.initial_master_nodes: ["mcjca033078", "mcjca032215", "mcjca032254"]

#
# For more information, consult the discovery and cluster formation module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

Kibana.yml

# Kibana is served by a back end server. This setting specifies the port to use.
server.port: 5601

# Specifies the address to which the Kibana server will bind. IP addresses and host names are both valid values.
# The default is 'localhost', which usually means remote machines will not be able to connect.
# To allow connections from remote users, set this parameter to a non-loopback address.
server.host: "mcjca033031"

# Enables you to specify a path to mount Kibana at if you are running behind a proxy.
# Use the `server.rewriteBasePath` setting to tell Kibana if it should remove the basePath
# from requests it receives, and to prevent a deprecation warning at startup.
# This setting cannot end in a slash.
#server.basePath: ""

# Specifies whether Kibana should rewrite requests that are prefixed with
# `server.basePath` or require that they are rewritten by your reverse proxy.
# This setting was effectively always `false` before Kibana 6.3 and will
# default to `true` starting in Kibana 7.0.
#server.rewriteBasePath: false

# The maximum payload size in bytes for incoming server requests.
#server.maxPayloadBytes: 1048576

# The Kibana server's name.  This is used for display purposes.
server.name: "mcjca033031"

# The URLs of the Elasticsearch instances to use for all your queries.
elasticsearch.hosts: ["http://mcjca033078:9200", "http://mcjca032215:9200", "http://mcjca032254:9200"]

# When this setting's value is true Kibana uses the hostname specified in the server.host
# setting. When the value of this setting is false, Kibana uses the hostname of the host
# that connects to this Kibana instance.
#elasticsearch.preserveHost: true

# Kibana uses an index in Elasticsearch to store saved searches, visualizations and
# dashboards. Kibana creates a new index if the index doesn't already exist.
#kibana.index: ".kibana"

# The default application to load.
#kibana.defaultAppId: "home"

# If your Elasticsearch is protected with basic authentication, these settings provide
# the username and password that the Kibana server uses to perform maintenance on the Kibana
# index at startup. Your Kibana users still need to authenticate with Elasticsearch, which
# is proxied through the Kibana server.
#elasticsearch.username: "kibana"
#elasticsearch.password: "pass"

# Enables SSL and paths to the PEM-format SSL certificate and SSL key files, respectively.
# These settings enable SSL for outgoing requests from the Kibana server to the browser.
#server.ssl.enabled: false
#server.ssl.certificate: /path/to/your/server.crt
#server.ssl.key: /path/to/your/server.key

# Optional settings that provide the paths to the PEM-format SSL certificate and key files.
# These files validate that your Elasticsearch backend uses the same key files.
#elasticsearch.ssl.certificate: /path/to/your/client.crt
#elasticsearch.ssl.key: /path/to/your/client.key

# Optional setting that enables you to specify a path to the PEM file for the certificate
# authority for your Elasticsearch instance.
#elasticsearch.ssl.certificateAuthorities: [ "/path/to/your/CA.pem" ]

# To disregard the validity of SSL certificates, change this setting's value to 'none'.
#elasticsearch.ssl.verificationMode: full

# Time in milliseconds to wait for Elasticsearch to respond to pings. Defaults to the value of
# the elasticsearch.requestTimeout setting.
#elasticsearch.pingTimeout: 1500

# Time in milliseconds to wait for responses from the back end or Elasticsearch. This value
# must be a positive integer.
#elasticsearch.requestTimeout: 30000

# List of Kibana client-side headers to send to Elasticsearch. To send *no* client-side
# headers, set this value to [] (an empty list).
#elasticsearch.requestHeadersWhitelist: [ authorization ]

# Header names and values that are sent to Elasticsearch. Any custom headers cannot be overwritten
# by client-side headers, regardless of the elasticsearch.requestHeadersWhitelist configuration.
#elasticsearch.customHeaders: {}

# Time in milliseconds for Elasticsearch to wait for responses from shards. Set to 0 to disable.
#elasticsearch.shardTimeout: 30000

# Time in milliseconds to wait for Elasticsearch at Kibana startup before retrying.
#elasticsearch.startupTimeout: 5000

# Logs queries sent to Elasticsearch. Requires logging.verbose set to true.
#elasticsearch.logQueries: false

# Specifies the path where Kibana creates the process ID file.
#pid.file: /var/run/kibana.pid

# Enables you specify a file where Kibana stores log output.
#logging.dest: stdout

# Set the value of this setting to true to suppress all logging output.
#logging.silent: false

# Set the value of this setting to true to suppress all logging output other than error messages.
#logging.quiet: false

# Set the value of this setting to true to log all events, including system usage information
# and all requests.
#logging.verbose: false

# Set the interval in milliseconds to sample system and process performance
# metrics. Minimum is 100ms. Defaults to 5000.
#ops.interval: 5000

# Specifies locale to be used for all localizable strings, dates and number formats.
# Supported languages are the following: English - en , by default , Chinese - zh-CN .
#i18n.locale: "en"

另外，当我运行 ss -tunlp | grep 5601_在Kibana启动期间，我看到Kibana服务正在 _5601
上监听。但是，在多次尝试自动连接到ES的过程中，它停止监听5601和 _ss -tunlp | grep 5601不_返回任何内容。