elasticSearch 起步(CentOS7 success)

安装和启动

这里使用docker进行安装的

docker pull elasticsearch

然后使用

docker run -e ES_JAVA_OPTS="-Xms256m -Xmx265m" -d -p 9200:9200 -p 9300:9300 --name ES01 5acf0e8da90b

进行启动(因为需要很大的内存空间,所以把占用的内存空间限制在256m上)


以上是docker下的安装,注意要安装2.6以下的版本,5x以上的版本连接9300需要在yaml里面做配置


正常的安装

1.安装jdk

1.1 执行命令下面命令查看可安装java版本
yum -y list java*
1.2 选择一个java版本进行安装,
yum install -y java-1.8.0-openjdk-devel.x86_64

这里有个地方要注意,要选择 要带有-devel的安装,因为这个安装的是jdk,而那个不带-devel的安装完了其实是jre。

1.3 输入java -version查看已安装的jdk版本,当出现如下输出表示安装成功。
1.4 jdk 的安装目录
/usr/lib/jvm 
1.5 配置环境变量,编辑/etc/profile文件:
vi /etc/profile
1.6 在文件尾部添加如下配置:
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el6_10.x86_64    export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar     export PATH=$PATH:$JAVA_HOME/bin
1.7 :wq退出vim编辑器,然后使用命令更新配置
source /etc/profile

2. 安装ES

2.1 依次执行命令

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.2.zip
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.2.zip.sha512
shasum -a 512 -c elasticsearch-6.3.2.zip.sha512 
unzip elasticsearch-6.3.2.zip
cd elasticsearch-6.3.2/ 
遇到错误1
-bash: shasum: command not found

    解决方案:在CentOS上,“shasum”被称为“sha1sum”,运行下面命令修复此问题

ln -s /usr/bin/sha1sum /usr/bin/shasum
遇到错误2
sha1sum: invalid option -- 'a'

    解决方案:

yum install -y perl-Digest-SHA
遇到报错3
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)

    解决方案:调小启动内存,如果512m还是不行的话,就得要再往下调了

[root@iZwz9ahuk6xeihs1n3gqy5Z elasticsearch-6.3.2]# vi config/jvm.options        
#-Xms2g        
#-Xmx2g        
-Xms512m        
-Xmx512m
遇到报错4:

无法以root权限启动

org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root

    解决方案:创建一个非root用户并赋予目录该用户权限,再启动

#root身份 groupadd es       
useradd es -g es -p es        
chown es:es ${elasticsearch_HOME}/ #存放elasticsearch的目录 
su - es  #切换到es用户下        
${elasticsearch_HOME}/bin/elasticsearch #启动elasticsearch
遇到报错5
ERROR: [4] bootstrap checks failed
      [1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]
      [2]: max number of threads [1024] for user [e] is too low, increase to at least [4096]
      [3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
      [4]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk

    解决方案:

    【5.1】【5.2】

#root身份
vi /etc/security/limits.conf  
#文件末尾添加内容(*也是要加上去)
* soft nofile 65536  
* hard nofile 131072  
* soft nproc 4096  
* hard nproc 4096  

    【5.3】

#root身份
sysctl -w vm.max_map_count=262144
vim /etc/sysctl.conf     #让配置永久生效 
#文件末尾添加内容
vm.max_map_count=262144 

  【5.4】

    Centos6不支持SecComp,而ES6默认bootstrap.system_call_filter为true

vim config/elasticsearch.yml 

      禁用:在elasticsearch.yml中配置bootstrap.system_call_filter为false,注意要在Memory下面:       

#注意在":"后面需要空格
bootstrap.memory_lock: false   
bootstrap.system_call_filter: false
遇到报错6

还有一些其他的错误,比如防火墙没开放端口

遇到报错7

OpenJDK 64-Bit

问题二: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

报错原因:某些软件包启动的时候默认启用 -XX:+AssumeMP导致

解决方案:在jvm.optipons配置文件添加 -XX:-AssumeMP
遇到报错8

启动失败,检查没有通过,报错

[2018-05-18T17:44:59,658][INFO ][o.e.b.BootstrapChecks    ] [gFOuNlS] bound or publishing to a non-loopback address, enforcing bootstrap checks
ERROR: [2] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]

编辑 /etc/security/limits.conf,追加以下内容;
* soft nofile 65536
* hard nofile 65536
此文件修改后需要重新登录用户,才会生效
  • soft nofile 65536
  • hard nofile 65536
    此文件修改后需要重新登录用户,才会生效
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

编辑 /etc/sysctl.conf,追加以下内容:
vm.max_map_count=655360
保存后,执行:
sysctl -p

重启成功

编辑 /etc/sysctl.conf,追加以下内容:
vm.max_map_count=655360
保存后,执行:
sysctl -p

在此感谢两位博主

https://blog.csdn.net/feng12345zi/article/details/80367907

https://www.cnblogs.com/jj81/p/9404576.html

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