Elasticsearch在Centos 7上的安装与配置
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)OpenJDK64-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/downlo... ，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/sutestuser
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
surootvim /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
surootvim /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=65536minprocs=32768[program:es]process_name=%(program_name)s_%(process_num)02ddirectory=/usr/local/elasticsearch-5.6.3/command=/usr/local/elasticsearch-5.6.3/bin/elasticsearch;autostart=trueautorestart=falseuser=testusernumprocs=1
