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centos7虚拟机安装elasticsearch5.0.x-安装篇
请预先安装jdk详细步骤请参考：https://www.jb51.net/softjc/193398.html
创建新用户（非root用户）
elasticsearch只能用非root启动，这里我创建了一个叫seven的用户
[root@localhost ~]# useradd seven [root@localhost ~]# passwd seven
下载elasticsearch
[root@localhost ~]# su seven [seven@localhost root]$ cd /home/seven [seven@localhost ~]$ mkdir download [seven@localhost ~]$ cd download [seven@localhost download]$ wget https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/tar/elasticsearch/5.0.0-alpha3/elasticsearch-5.0.0-alpha3.tar.gz
解压并运行elasticsearch
解压
[seven@localhost download]$ tar -zxvf elasticsearch-5.0.0-alpha3.tar.gz
移动到指定文件夹并重命名（方便管理）
[seven@localhost download]$ mv elasticsearch-5.0.0-alpha3 /usr/java/elasticsearch
修改访问elasticsearch的IP及端口
[seven@localhost config]$ vim /usr/java/elasticsearch/config/elasticsearch.yml
找到如下代码段，并取消network.host及http.port所在行的注释，修改IP及端口
# ---------------------------------- Network ----------------------------------- # # Set the bind address to a specific IP (IPv4 or IPv6): # network.host: 192.168.0.155 # # Set a custom port for HTTP: # http.port: 9200 # # For more information, see the documentation at: # <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html>
直接运行bin/elasticsearch文件启动elasticsearch
[seven@localhost bin]$ cd /usr/java/elasticsearch/bin/ [seven@localhost bin]$ ./elasticsearch
启动时发现报错了。。。
[seven@localhost bin]$ ./elasticsearch [2016-06-28 13:49:27,899][INFO ][node ] [Mondo] version[5.0.0-alpha3], pid[3671], build[cad959b/2016-05-26T08:25:57.564Z], OS[Linux/3.10.0-327.el7.x86_64/amd64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1 .0_91/25.91-b14] ▽2016-06-28 13:49:27,900][INFO ][node ] [Mondo] initializing ... [2016-06-28 13:49:28,941][INFO ][plugins ] [Mondo] modules [percolator, lang-mustache, lang-painless, ingest-grok, reindex, lang-expression, lang-groovy], plugins [] [2016-06-28 13:49:28,963][INFO ][env ] [Mondo] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [15.7gb], net total_space [17.4gb], spins"main" java.lang.RuntimeException: bootstrap checks failed initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536] please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your cluster max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144] at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:125) at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85) at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65) at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:183) at org.elasticsearch.node.Node.start(Node.java:337) at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:198) at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257) at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:96) at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:91) at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:91) at org.elasticsearch.cli.Command.main(Command.java:53) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:70) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:63) Refer to the log for complete error details. [2016-06-28 13:49:32,144][INFO ][node ] [Mondo] stopping ... [2016-06-28 13:49:32,198][INFO ][node ] [Mondo] stopped [2016-06-28 13:49:32,198][INFO ][node ] [Mondo] closing ... [2016-06-28 13:49:32,210][INFO ][node ] [Mondo] closed
于是我临时提高了vm.max_map_count的大小
*此操作需要root权限
[root@localhost ~]# sysctl -w vm.max_map_count=262144
查看修改结果
[root@localhost ~]# sysctl -a|grep vm.max_map_count vm.max_map_count = 262144
或者永久性修改
[root@localhost ~]# cat /etc/sysctl.conf | grep -v "vm.max_map_count" > /tmp/system_sysctl.conf [root@localhost ~]# echo "vm.max_map_count=262144" /tmp/system_sysctl.conf [root@localhost ~]# mv /tmp/system_sysctl.conf /etc/sysctl.conf mv：是否覆盖"/etc/sysctl.conf"？ y [root@localhost ~]# cat /etc/sysctl.conf # System default settings live in /usr/lib/sysctl.d/00-system.conf. # To override those settings, enter new settings here, or in an /etc/sysctl.d/<name>.conf file # # For more information, see sysctl.conf(5) and sysctl.d(5). vm.max_map_count=262144 [root@localhost ~]# sysctl -p vm.max_map_count = 262144
上面还有一个错误是关于jvm内存分配的问题heap size [268435456] not equal to maximum heap size [2147483648]，需要修改的jvm配置
[seven@localhost bin]$ vim /usr/java/elasticsearch/config/jvm.options
将-Xmx2g改成-Xmx256m，也就是heap size [268435456] /1024/1024的值
又有新的错误。。。
Exception in thread "main" java.lang.RuntimeException: bootstrap checks failed initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536] memory locking requested for elasticsearch process but memory is not locked at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:125) at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85) at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65) at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:183) at org.elasticsearch.node.Node.start(Node.java:337) at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:198) at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257) at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:96) at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:91) at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:91) at org.elasticsearch.cli.Command.main(Command.java:53) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:70) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:63) Refer to the log for complete error details. [2016-06-28 14:55:49,770][INFO ][node ] [Goldbug] stopping ... [2016-06-28 14:55:49,875][INFO ][node ] [Goldbug] stopped [2016-06-28 14:55:49,875][INFO ][node ] [Goldbug] closing ... [2016-06-28 14:55:49,887][INFO ][node ] [Goldbug] closed
这个问题折腾了我一下午，最后还是找到了解决方案，同样回到config/elasticsearch.yml文件，找到如下配置，开放discovery.zen.ping.unicast.hosts及discovery.zen.minimum_master_nodes
# --------------------------------- Discovery ---------------------------------- # # Pass an initial list of hosts to perform discovery when new node is started: # The default list of hosts is ["127.0.0.1", "[::1]"] # discovery.zen.ping.unicast.hosts: ["192.168.0.155"] # # Prevent the "split brain" by configuring the majority of nodes (total number of nodes / 2 + 1): # discovery.zen.minimum_master_nodes: 3 # # For more information, see the documentation at: # <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery.html>
然后修改max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]这个错误（切换到root操作）
[root@localhost ~]# cp /etc/security/limits.conf /etc/security/limits.conf.bak [root@localhost ~]# cat /etc/security/limits.conf | grep -v "seven" > /tmp/system_limits.conf [root@localhost ~]# echo "seven hard nofile 65536" /tmp/system_limits.conf [root@localhost ~]# echo "seven soft nofile 65536" /tmp/system_limits.conf [root@localhost ~]# mv /tmp/system_limits.conf /etc/security/limits.conf
修改后重新登录seven用户，使用如下命令查看是否修改成功
[seven@localhost ~]$ ulimit -Hn 65536
接下来就可以启动elasticsearch了，启动完成使用浏览器访问http://192.168.0.155:9200
{
"name" : "Vampire by Night",
"cluster_name" : "elasticsearch",
"version" : {
"number" : "5.0.0-alpha3",
"build_hash" : "cad959b",
"build_date" : "2016-05-26T08:25:57.564Z",
"build_snapshot" : false,
"lucene_version" : "6.0.0"
},
"tagline" : "You Know, for Search"
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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一种情况是，很多大模型产品看得见却摸不着，在台上一个个遥遥领先——今天Sora技精四座，明天英伟达的机器人又赢得满堂彩，可是到了台下一问：啥时候能用上啊？答曰：遥遥无期。
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