1. 改變虛擬機內存大小 cd config/jvm.optionsjava
-Xms256m
-Xmx256mnode
1.org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as rootbootstrap
不能用root身份登陸多線程
解決辦法jvm
groupadd student useradd mm -g student -p 123
chown -R pp:student elasticsearch-7.0.0
切換至pp用戶登陸運行，成功elasticsearch
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2.Cannot allocate memory'ui
沒法分配內存spa
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3. max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
對於elasticsearch進程，max文件描述符[4096]太低，至少增長到[65535]
vi /etc/security/limits.conf
添加以下內容:
* soft nofile 65536
* hard nofile 65536
* soft nproc 4096
* hard nproc 4096
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4.max number of threads [3758] for user [pp] is too low, increase to at least [4096]
用戶最多線程數[3758][pp]過低，至少增長到[4096]
cd /etc/security
cd limits.d/
vi 20-nproc.conf
* soft nproc 4096
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5.max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
最大虛擬內存區域vm。max_map_count[65530]過低，至少增長到[262144]
解決：切換到root用戶修改配置sysctl.conf
vi /etc/sysctl.conf
添加下面配置：
vm.max_map_count=655360
並執行命令：
sysctl -p
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6.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
默認的發現設置不適合生產使用;至少有一個[發現]。seed_hosts,發現。seed_providers,集羣。必須配置initial_master_nodes]
這時候繼續編輯elasticsearch.yml文件將 #cluster.initial_master_nodes: ["node-1", "node-2"] 修改成 cluster.initial_master_nodes: ["node-1"]，記得保存。