centos安装elasticsearch-7.6.1

由于想尝试下Spring Data Elasticsearch ,就决定安装下elastic search ,把我的两个环境都装上了,一个是阿里云64位的centos7.7,还有一个是32位的centos6.5.说实话32位的机子装es挺难的,要修改的点也多,所以记录下,感觉明天就要忘了.

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安装配置es:端口9200 9300

1. 添加新用户useradd 用户名
2. 设置新用户密码:passwd lixiang 不管提示,重复2次
3. 将安装包传到用户目录下
4. 修改安装包所属: chown lixiang:lixiang elasticsearch-7.6.1-linux-x86_64.tar.gz
5. 修改安装包权限:chmod 777 elasticsearch-7.6.1-linux-x86_64.tar.gz
6. 选择操作用户:su - 用户名
7. 解压文件:tar -zxvf elasticsearch-7.6.1-linux-x86_64.tar.gz
8. 将解压后的文件更名:mv elasticsearch-7.6.1 elasticsearch
9. 进入config目录修改配置: cd config/
10. vim jvm.opions
11. 修改运行时所占内存: -Xms512m -Xmx512m
12. 修改配置vim elasticsearch.yml
13. 修改Node中: node.master: true cluster.name: my-application node.name: node-1
14. 更改数据目录(去掉#) 这里写自己的目录
    path.data: /home/lixiang/elasticsearch/data
    path.logs: /home/lixiang/elasticsearch/logs
15. 配置任意ip可以访问:network.host: 0.0.0.0
16. 在elasticsearch创建data目录: mkdir data
17. 放行端口:
    9200作为Http协议，主要用于外部通讯
    9300作为Tcp协议，jar之间就是通过tcp协议通讯
    ES集群之间是通过9300进行通讯

可能发生的错误

1. 提示内核版本过低 [ROG] unable to install syscall filter:
   去elasticsearch.yml禁用插件,尾部加一行:: bootstrap.system_call_filter: false

2. 提示elasticsearch用户拥有的内存权限太小，至少需要262144；
   进入root用户:vim /etc/sysctl.conf
   末尾加上: vm.max_map_count=262144
   执行: sysctl -p
   返回lixiang用户 再次启动

3. 提示: [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 configured
   修改elasticsearch.yml: cluster.initial_master_nodes: [“node-1”]

4. unable to load JNA native support library, native methods will be disabled.
   系统为32位: 进入es的lib目录，先删除 jna-4.5.1.jar
   通过命令wget https://repo1.maven.org/maven2/net/java/dev/jna/jna/4.5.1/jna-4.5.1.jar重新下载一个。
   再去运行es

5. X-Pack is not supported and Machine Learning is not available for [linux-x86]; you can use the other X-Pack features
   进入config目录，修改elasticsearch.yml文件，
   在文件最下面添加: xpack.ml.enabled: false

6. max number of threads [1024] for user [lixiang] is too low, increase to at least [4096]
   root下: vim /etc/security/limits.d/90-nproc.conf
   改为: * soft nproc 4096

7. max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
   每个进程最大同时打开文件数太小，
   进入config目录，修改elasticsearch.yml文件，合并上个问题,改完后:
   *     hard nofile 65536
   *     soft nproc 4096
   *     hard nproc 4096
   root soft nproc unlimited

8. JVM is using the client VM [Java HotSpot™ Client VM] but should be using a server VM for the best performance
   打开你安装的jdk找到里面的jre，进入jre下的lib/i386目录，修改jvm.cfg，找到:
   -server KNOWN
   -client IF_SERVER_CLASS -server
   -minimal KNOWN
   调换-server和-client的位置，最后变成上面这样即可。

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运行elastic search

前台运行命令: ./elasticsearch
后台运行命令：./elasticsearch -d
这样就可以后台运行了，启动时看不到日志
之后如果要关闭es进程：
1.ps -ef | grep elastic
2.kill相应进程
kill -9 pid
例如：kill -9 987

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安装配置kibana(需要node.js环境):端口5601

1. 解压文件
2. 修改config下的kibana.yml
   配置: elasticsearch.hosts: [“http://elasticsearch所在地址:9200”]
   server.host: “0.0.0.0”
   elasticsearch.requestTimeout: 90000
3. 在bin下的kibana.bat启动

kibana启动失败no known master node, scheduling a retry或者master_not_discovered_exception

在es配置文件末尾加上: xpack.license.self_generated.type: basic
	discovery.seed_hosts: ["127.0.0.1:9300"]
	Node中添加:   node.master: true
	cluster.name: my-application
	node.name: node-1

给es添加ik分词器插件

1.将压缩包放到 plugins目录下
2.安装unzip: yum install -y unzip zip
3.解压 : unzip elasticsearch-analysis-ik-7.6.1.zip -d ik-analyer
4.回到bin目录重启es 之前别忘了关es

最后附上centos6.5的es的配置文件

# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
cluster.name: my-application
node.master: true
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: node-1
#
# 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: /home/lixiang/elasticsearch/data
#
# Path to log files:
#
path.logs: /home/lixiang/elasticsearch/logs
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 0.0.0.0
#
# 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: ["127.0.0.1:9300"]
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
#cluster.initial_master_nodes: ["node-1"]
cluster.initial_master_nodes: ["node-1"]
#
# 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
bootstrap.system_call_filter: false
xpack.ml.enabled: false
xpack.license.self_generated.type: basic 

简单的分词测试

GET /_search
POST _analyze
{
  "analyzer": "ik_max_word",
  "text":     "我是中国人"
}

最后说下,最好别用32位和低版本的centos,不然我上面列出的问题都得改一遍