elasticsearch安装之各种坑

我用的是centos6.5，安装elasticsearch5.2.0

首先不说了，安装JDK1.8，下载elasticsearch5.2.0

https://www.elastic.co/downloads/past-releases

上传到linux下，解压tar -zxvf ...

ela2.0之后不能用root启动了

#adduser tommy
#passwd tommy   //修改密码

#vim /etc/sudoers

方法一：修改 /etc/sudoers 文件，找到下面一行，把前面的注释（#）去掉

## Allows people in group wheel to run all commands
%wheel    ALL=(ALL)    ALL

然后修改用户，使其属于root组（wheel），命令如下：

#usermod -g root tommy

切换到tommy账户

修改elasticsearch/config/elasticsearch.yml文件

path.data: /data/shuju/

path.logs: /data/logs/

# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 172.16.255.231
#
# 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 new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
discovery.zen.ping.unicast.hosts: ["172.16.255.231", "[::1]"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
discovery.zen.minimum_master_nodes: 3
bootstrap.memory_lock: false   //这个解决centos6.5下出现的问题
bootstrap.system_call_filter: false 

错误1

max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

 [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

错误2

max number of threads [1024] for user [elasticsearch] is too low, increase to at least [2048]

修改 /etc/security/limits.d/90-nproc.conf 

*          soft    nproc     1024

*          soft    nproc     2048

错误3

JavaHotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error='Cannot allocate memory' (errno=12)

由于elasticsearch5.0默认分配jvm空间大小为2g，修改jvm空间分配

    # vim config/jvm.options
    -Xms2g  --》修改为512m
    -Xmx2g  --》修改为512m

错误4

自己创建文件目录，不然会报找不到目录然后不能创建文件的错误

剩下的我也不记得了，遇到问题就解决问题吧

[root@lijia231 ~]# curl 172.16.255.231:
{
  "name" : "xPqxh4x",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "_na_",
  "version" : {
    "number" : "5.2.0",
    "build_hash" : "24e05b9",
    "build_date" : "2017-01-24T19:52:35.800Z",
    "build_snapshot" : false,
    "lucene_version" : "6.4.0"
  },
  "tagline" : "You Know, for Search"
}

最后出现这个说明暂时安装成功了。