Elasticsearch系列--安装

第一步下载
ElasticSearch官网
ElasticSearch下载页面
PS:安装时多种多样,试过yum可能是我操作有问题三次没安对,wget之后下载tar试了两次都是下载一半就失败了,最后还是在PC上下载的tar包在上传到linux上才正式完成了下载功能.

解压缩刚才下载的压缩包 tar -xzf elasticsearch-7.2.0-linux-x86_64.tar.gz;
PS:如果失败首先就要看下载的压缩包大小是不是321M,因为我就遇到了下载下载22M

切换到你的安装目录 cd /opt/elasticsearch-7.2.0

不要急着启动,因为ElasticSearch是不允许使用root账户启动的:
#创建分组
groupadd ealstic
#创建用户
useradd ealsticUser
#给用户设置密码
passwd ealsticUser
#用户加入分组
usermod -G elastic elasticUser
#给用户分配ealstic目录权限
chown -R elasticUser:ealstic /opt/elasticsearch-7.2.0
到这里权限就分配好了

补上root允许报错信息:
uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-7.2.0.jar:7.2.0]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.2.0.jar:7.2.0]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-7.2.0.jar:7.2.0]
… 6 more

#切换到elasticUser用户下
su elasticUser
#因为分配全线之前已经进入到安装目录了使用直接启动
bin/elasticsearch
如果是大吉大利到这里就完成了.

问题一:
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N
OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c5330000, 986513408, 0) Failed; error=‘Cannot allocate memory’ (errno=12)
at org.elasticsearch.tools.launchers.JvmErgonomics.flagsFinal(JvmErgonomics.java:111)
at org.elasticsearch.tools.launchers.JvmErgonomics.finalJvmOptions(JvmErgonomics.java:79)
at org.elasticsearch.tools.launchers.JvmErgonomics.choose(JvmErgonomics.java:57)
at org.elasticsearch.tools.launchers.JvmOptionsParser.main(JvmOptionsParser.java:89)
修改config目录下的jvm.options里面的参数(最好切换回root用户)
vi /opt/elasticsearch-7.2.0/config/jvm.options
修改jvm内存(这有个上限32G,默认是1G,建议是总内存的一半,由于我这个服务器本身内存较小就随便设置一个先启动再说)
-xms100m
-Xmx100m
(某些软件包启动的时候默认启用 -XX:+AssumeMP,参考链接)
-XX:-AssumeMP
看到上面的错误描述中有XX:ParallelGCThreads可能这里的设置也有问题但是配置上面三个之后这个问题就解决了以后再研究.

问题二:
Exception in thread “main” org.elasticsearch.bootstrap.BootstrapException: java.nio.file.AccessDeniedException: /opt/elasticsearch-7.2.0/config/elasticsearch.keystore
Likely root cause: java.nio.file.AccessDeniedException: /opt/elasticsearch-7.2.0/config/elasticsearch.keystore
at sun.nio.fs.UnixException.translatetoIOException(UnixException.java:84)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
at java.nio.file.Files.newByteChannel(Files.java:361)
at java.nio.file.Files.newByteChannel(Files.java:407)
at org.apache.lucene.store.SimpleFSDirectory.openInput(SimpleFSDirectory.java:77)
at org.elasticsearch.common.settings.KeyStoreWrapper.load(KeyStoreWrapper.java:206)
at org.elasticsearch.bootstrap.Bootstrap.loadSecureSettings(Bootstrap.java:234)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:305)
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159)
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150)
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124)
at org.elasticsearch.cli.Command.main(Command.java:90)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)
Refer to the log for complete error details.
问题不大,在bin目录下已经提供elasticsearch-keystore工具了,
bin/elasticsearch-keystore create 在config目录创建一个elasticsearch.keystore文件

待续…