centos7 安装 elasticsearch

安装java环境

这里使用yum方式安装，前提是必须有网络

yum install java-1.8.0-openjdk

安装完成，查看java版本

[root@localhost ~]# java -version 
openjdk version "1.8.0_151" OpenJDK Runtime Environment (build 1.8.0_151-b12) OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode) 

安装 Elasticsearch

Elasticsearch的安装很简单，下载下来解压即可，这里使用wget下载，当然也可通过网页下载 https://www.elastic.co/downloads/elasticsearch ，再拷贝。

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.3.tar.gz 

解压到/usr/local/

tar -zxvf elasticsearch-5.6.3.tar.gz -C /usr/local/ 

运行Elasticsearch

Elasticsearch 要求不能使用超级用户root运行，所以我们建立一个testuser账号

# 创建testuser账户
adduser testuser
# 修改密码
passwd testuser

然后，给testuser用户elasticsearch目录的授权。

chown -R testuser /usr/local/elasticsearch-5.6.3/ 

切换至elasticsearch目录，并以testuser用户运行

cd /usr/local/elasticsearch-5.6.3/ su testuser 

运行elasticsearch，如果想后台运行后面加 -d

[testuser@localhost elasticsearch-5.6.3]$ ./bin/elasticsearch [2017-10-31T16:07:09,445][INFO ][o.e.n.Node ] [] initializing ... [2017-10-31T16:07:09,662][INFO ][o.e.e.NodeEnvironment ] [oDFU6c3] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [45.4gb], net total_space [49.9gb], spins? [unknown], types [rootfs] [2017-10-31T16:07:09,662][INFO ][o.e.e.NodeEnvironment ] [oDFU6c3] heap size [1.9gb], compressed ordinary object pointers [true] [2017-10-31T16:07:09,663][INFO ][o.e.n.Node ] node name [oDFU6c3] derived from node ID [oDFU6c3UT6ORC2p0CKBeLA]; set [node.name] to override [2017-10-31T16:07:09,663][INFO ][o.e.n.Node ] version[5.6.3], pid[11484], build[1a2f265/2017-10-06T20:33:39.012Z], OS[Linux/3.10.0-514.26.2.el7.x86_64/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/1.8.0_151/25.151-b12] [2017-10-31T16:07:09,664][INFO ][o.e.n.Node ] JVM arguments [-Xms2g, -Xmx2g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -Djdk.io.permissionsUseCanonicalPath=true, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Dlog4j.skipJansi=true, -XX:+HeapDumpOnOutOfMemoryError, -Des.path.home=/usr/local/elasticsearch-5.6.3] [2017-10-31T16:07:10,723][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [aggs-matrix-stats] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [ingest-common] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [lang-expression] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [lang-groovy] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [lang-mustache] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [lang-painless] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [parent-join] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [percolator] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [reindex] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [transport-netty3] [2017-10-31T16:07:10,724][INFO ][o.e.p.PluginsService ] [oDFU6c3] loaded module [transport-netty4] [2017-10-31T16:07:10,725][INFO ][o.e.p.PluginsService ] [oDFU6c3] no plugins loaded [2017-10-31T16:07:12,622][INFO ][o.e.d.DiscoveryModule ] [oDFU6c3] using discovery type [zen] [2017-10-31T16:07:13,133][INFO ][o.e.n.Node ] initialized [2017-10-31T16:07:13,133][INFO ][o.e.n.Node ] [oDFU6c3] starting ... [2017-10-31T16:07:13,306][INFO ][o.e.t.TransportService ] [oDFU6c3] publish_address {127.0.0.1:9300}, bound_addresses {[::1]:9300}, {127.0.0.1:9300} [2017-10-31T16:07:13,318][WARN ][o.e.b.BootstrapChecks ] [oDFU6c3] max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536] [2017-10-31T16:07:16,372][INFO ][o.e.c.s.ClusterService ] [oDFU6c3] new_master {oDFU6c3}{oDFU6c3UT6ORC2p0CKBeLA}{olaY-n5LTpCUpzrhU3joVw}{127.0.0.1}{127.0.0.1:9300}, reason: zen-disco-elected-as-master ([0] nodes joined) [2017-10-31T16:07:16,398][INFO ][o.e.h.n.Netty4HttpServerTransport] [oDFU6c3] publish_address {127.0.0.1:9200}, bound_addresses {[::1]:9200}, {127.0.0.1:9200} [2017-10-31T16:07:16,399][INFO ][o.e.n.Node ] [oDFU6c3] started [2017-10-31T16:07:17,242][INFO ][o.e.g.GatewayService ] [oDFU6c3] recovered [0] indices into cluster_state 

如果没有没有error，就运行成功啦

新开一个终端，用curl访问

[root@localhost ~]# curl 'http://localhost:9200/?pretty' 
{ "name" : "oDFU6c3", "cluster_name" : "elasticsearch", "cluster_uuid" : "v2mGsAuuTsqIzzm8CZcW5w", "version" : { "number" : "5.6.3", "build_hash" : "1a2f265", "build_date" : "2017-10-06T20:33:39.012Z", "build_snapshot" : false, "lucene_version" : "6.6.1" }, "tagline" : "You Know, for Search" } 

其他配置

elasticsearch指定ip地址

编辑es的配置文件

[testuser@localhost elasticsearch-5.6.3]$ vim ./config/elasticsearch.yml 

找到network.host: 一行，去除#号，修改为：

network.host: [_local_, 172.30.6.1] 

172.30.6.1为指定的ip地址，可以是多个。

这样就可以在浏览器里打开啦

http://172.30.6.1:9200/?pretty

可能遇到的问题

问题一

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

max_map_count 的值是指一个进程最多可用于的内存映射区(memory map areas)，在调用malloc会用到，由mmap/mprotect生成。

解决办法:

切换到root用户修改配置/etc/sysctl.conf

su root
vim /etc/sysctl.conf

加入

vm.max_map_count=655360

然后使其生效

sysctl -p

问题二

[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536] 

文件描述符太低

解决办法:

切换到root用户修改/etc/security/limits.conf

su root
vim /etc/security/limits.conf

加入

* soft nofile 65536
* hard nofile 131072
* soft nproc 2048 * hard nproc 4096 

问题三

使用supervisor启动时，查看日志仍然报下面的错误

[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536] 

解决办法:

切换到root用户修改vim /etc/supervisord.d/elasticsearch.conf

[supervisord]
minfds=65536
minprocs=32768 [program:es] process_name=%(program_name)s_%(process_num)02d directory=/usr/local/elasticsearch-5.6.3/ command=/usr/local/elasticsearch-5.6.3/bin/elasticsearch ;autostart=true autorestart=false user=testuser numprocs=1