本文介绍了centos7上elastic search安装及填坑记,分享给大家,具体如下:
下载elastic search 5.3.0
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.3.0.tar.gz
mv elasticsearch-5.3.0.tar.gz /opt
cd /opt
tar -xzvf elasticsearch-5.3.0.tar.gz
cd elasticsearch-5.3.0/
启动ES
cd /bin
./elasticsearch
按照道理应该就可以了,然而接下来各种坑一一出现,分别阐述
错误1:
error=Cannot allocate memory (errno=12)
error=Cannot allocate memory
solutions:
由于elasticsearch5.0默认分配jvm空间大小为2g,需要改小一点
vim config/jvm.options
-Xms2g → -Xms512m
-Xmx2g → -Xmx512m
错误2:
can not run elasticsearch as root
can not run elasticsearch as root
solutions:
在 Linux 环境中,elasticsearch 不允许以 root 权限来运行!所以需要创建一个非root用户,以非root用户来起es
groupadd elk # 创建用户组elk
useradd elk -g elk -p 111111 # 创建新用户elk,-g elk 设置其用户组为 elk,-p 111 设置其密码6个1
chown -R elk:elk /opt # 更改 /opt 文件夹及内部文件的所属用户及组为 elk:elk
su elk # 切换到非root用户elk下来
错误3:(
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]
此错误出现在修改config/elasticsearch.yml中的network.host为network.host: 0.0.0.0以便让外网任何IP都能来访问时。
solutions:
切换到root用户,然后
vim /etc/security/limits.conf
* soft nofile 300000
* hard nofile 300000
* soft nproc 102400
* soft memlock unlimited
* hard memlock unlimited
/etc/security/limits.conf
错误4:
max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
vm.max_map_count is too low
solutions:
先要切换到root用户;
然后可以执行以下命令,设置 vm.max_map_count ,但是重启后又会恢复为原值。
sysctl -w vm.max_map_count=262144
持久性的做法是在 /etc/sysctl.conf 文件中修改 vm.max_map_count 参数:
echo “vm.max_map_count=262144”
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