3 centos 下安装 elastic search 启动的问题

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正常步骤

1Download and unzip Elasticsearch

2 Run bin/elasticsearch

3 Run curl http://localhost:9200/

异常信息：

root 账户启动报错，Exception in thread "main" Java.lang.RuntimeException: don't run elasticsearch as root.

解决办法：

解决方法1：

在执行elasticSearch时加上参数-Des.insecure.allow.root=true，完整命令如下

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./elasticsearch -Des.insecure.allow.root=true  

解决办法2：

用vi打开elasicsearch执行文件，在变量ES_JAVA_OPTS使用前添加以下命令

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ES_JAVA_OPTS="-Des.insecure.allow.root=true"  

解决办法3：

添加新用户组和用户，让非root 用户组用户启动：

groupadd elsearch

useradd es -g elsearch -p 123456

然后把我们的es 所在文件夹的用户指定为 elsearch

chown -R elsearch:elsearch elasticsearch

启动成功之后会有日志：

[2016-12-20T18:40:28,270][INFO ][o.e.g.GatewayService ] [MUQhN6Y] recovered [0] indices into cluster_state
[2016-12-20T18:40:28,276][INFO ][o.e.h.HttpServer ] [MUQhN6Y] publish_address {127.0.0.1:9200}, bound_addresses {[::1]:9200}, {127.0.0.1:9200}
[2016-12-20T18:40:28,276][INFO ][o.e.n.Node ] [MUQhN6Y] started

访问url 成功会有结果：

{
"name" : "MUQhN6Y",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "GQd_A6XCRFKMnzswmckmuA",
"version" : {
"number" : "5.1.1",
"build_hash" : "5395e21",
"build_date" : "2016-12-06T12:36:15.409Z",
"build_snapshot" : false,
"lucene_version" : "6.3.0"
},
"tagline" : "You Know, for Search"
}

现在本机访问可以访问了，但是在其他机器上访问还是有问题，提示连接拒绝,为什么呢？

因为这个端口只是监听127.0.0.1 的回环地址，不监听其他地址，而127 的地址只能本机访问，所以其他机器无法访问这台机器。

那该怎么办呢？

es 提供了解决办法：

/usr/local/share/elasticsearch-5.1.1/config 目录下有一个文件elasticsearch.yml

如果想监听本机所有ip ,则配置：network.host: 0.0.0.0

如果想监听指定ip，多个ip逗号隔开则：network.host: 127.0.0.1,192.168.12.18

然后重新启动，爆出异常：

1 max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]

2 vm.max_map_count [65530] likely too low, increase to at least [262144]

第一个问题：解决方案：

同样回到config/elasticsearch.yml文件，找到如下配置，开放discovery.zen.ping.unicast.hosts及discovery.zen.minimum_master_nodes

# --------------------------------- 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: ["192.168.0.155"]## Prevent the "split brain" by configuring the majority of nodes (total number of nodes / 2 + 1):#discovery.zen.minimum_master_nodes: 3## For more information, see the documentation at:# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery.html>1
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然后修改max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]这个错误（切换到root操作）

切换到root 用户：

[root@localhost ~]# cp /etc/security/limits.conf /etc/security/limits.conf.bak

[root@localhost ~]# cat /etc/security/limits.conf | grep -v "seven" > /tmp/system_limits.conf

[root@localhost ~]# echo "seven hard nofile 65536" >> /tmp/system_limits.conf

[root@localhost ~]# echo "seven soft nofile 65536" >> /tmp/system_limits.conf

[root@localhost ~]# mv /tmp/system_limits.conf /etc/security/limits.conf

以上serven 名称为自己的非root 用户名。

修改后重新登录seven用户，使用如下命令查看是否修改成功

[seven@localhost ~]$ ulimit -Hn65536

第2个问题：解决方案：

[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.confmv：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 -pvm.max_map_count = 2621441
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上面还有一个错误是关于jvm内存分配的问题heap size [268435456] not equal to maximum heap size [2147483648]，需要修改的jvm配置

[seven@localhost bin]$ vim /usr/java/elasticsearch/config/jvm.options1

将-Xmx2g改成-Xmx256m，也就是heap size [268435456] /1024/1024的值

又爆出第三个问题：max number of threads [1024] for user [lish] likely too low, increase to at least [2048]

解决方案：

# vi /etc/security/limits.d/90-nproc.conf # Default limit for number of user‘s processes to prevent# accidental fork bombs.# See rhbz #432903 for reasoning.*          soft    nproc     1024root       soft    nproc     unlimited

修改1024 为2048 。

最后终于启动成功，并且其他机器也可以访问了。

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