1. elasticsearch装置教程(linux_x86_64)
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.16.0-linux-x86_64.tar.gz# 增加新用户useradd elsearch# 创立一个soft目录，寄存下载的软件mkdir /soft# 进入，而后通过xftp工具，将刚刚下载的文件拖动到该目录下cd /soft# 解压缩tar -zxvf elasticsearch-7.9.1-linux-x86_64.tar.gz#重命名mv elasticsearch-7.9.1/ elsearchchown elsearch:elsearch /soft/ -Rcd /soft/elsearch/config#关上配置文件vim elasticsearch.yml #设置ip地址，任意网络均可拜访network.host: 0.0.0.0 # 勾销正文，并保留一个节点node.name: node-1cluster.initial_master_nodes: ["node-1"]http.cors.enabled: truehttp.cors.allow-origin: "*"http.cors.allow-headers: "*"
  • 在Elasticsearch中如果，network.host不是localhost或者127.0.0.1的话，就会认为是生产环境，会对环境的要求比拟高，咱们的测试环境不肯定可能满足，个别状况下须要批改2处配置，如下：
# 批改jvm启动参数vim conf/jvm.options#依据本人机器状况批改-Xms128m -Xmx128m
  • 而后在批改第二处的配置，这个配置要求咱们到宿主机器上来进行配置
# 到宿主机上关上文件vim /etc/sysctl.conf# 减少这样一条配置，一个过程在VMAs(虚拟内存区域)创立内存映射最大数量vm.max_map_count=655360# 让配置失效sysctl -p

启动ElasticSearch

su - elsearch# 进入bin目录cd /soft/elsearch/bin# 后盾启动./elasticsearch -d启动胜利后，拜访上面的URL$elsurl:9200/如果呈现了上面的信息，就示意曾经胜利启动了![image.png](/img/bVcWCa5)

谬误剖析
如果呈现上面的错误信息

java.lang.RuntimeException: can not run elasticsearch as root    at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:111)    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:178)    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:393)    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170)    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:161)    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:127)    at org.elasticsearch.cli.Command.main(Command.java:90)    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126)    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)For complete error details, refer to the log at /soft/elsearch/logs/elasticsearch.log[root@e588039bc613 bin]# 2020-09-22 02:59:39,537121 UTC [536] ERROR CLogger.cc@310 Cannot log to named pipe /tmp/elasticsearch-5834501324803693929/controller_log_381 as it could not be opened for writing2020-09-22 02:59:39,537263 UTC [536] INFO  Main.cc@103 Parent process died - ML controller exiting

就阐明你没有切换成 elsearch用户，因为不能应用root操作es

谬误状况2

[1]:max file descriptors [4096] for elasticsearch process is too low, increase to at least[65536]

解决办法：切换到root用户，编辑limits.conf增加如下内容

vi /etc/security/limits.conf# ElasticSearch增加如下内容:* soft nofile 65536* hard nofile 131072* soft nproc 2048* hard nproc 4096

谬误剖析3

也就是最大线程数设置的太低了，须要改成4096

#解决：切换到root用户，进入limits.d目录下批改配置文件。vi /etc/security/limits.d/90-nproc.conf#批改如下内容：* soft nproc 1024#批改为* soft nproc 4096

谬误状况4

[elsearch@e588039bc613 bin]$ Exception in thread "main" org.elasticsearch.bootstrap.BootstrapException: java.nio.file.AccessDeniedException: /soft/elsearch/config/elasticsearch.keystoreLikely root cause: java.nio.file.AccessDeniedException: /soft/elsearch/config/elasticsearch.keystore    at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:90)    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)    at java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:219)    at java.base/java.nio.file.Files.newByteChannel(Files.java:375)    at java.base/java.nio.file.Files.newByteChannel(Files.java:426)    at org.apache.lucene.store.SimpleFSDirectory.openInput(SimpleFSDirectory.java:79)    at org.elasticsearch.common.settings.KeyStoreWrapper.load(KeyStoreWrapper.java:220)    at org.elasticsearch.bootstrap.Bootstrap.loadSecureSettings(Bootstrap.java:240)    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349)    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170)    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:161)    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:127)    at org.elasticsearch.cli.Command.main(Command.java:90)    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126)    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)

咱们通过排查，发现是因为 /soft/elsearch/config/elasticsearch.keystore 存在问题


也就是说该文件还是所属于root用户，而咱们应用elsearch用户无奈操作，所以须要把它变成elsearch

chown elsearch:elsearch elasticsearch.keystore

谬误状况5

[1]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configuredERROR: Elasticsearch did not exit normally - check the logs at /soft/elsearch/logs/elasticsearch.log

持续批改配置 elasticsearch.yaml

# 勾销正文，并保留一个节点node.name: node-1cluster.initial_master_nodes: ["node-1"]