前言
Elasticsearch 是一个分布式全文检索引擎
Elasticsearch is a distributed, JSON-based search and analytics engine designed for horizontal scalability, maximum reliability, and easy management.
具有强大的文本检索与分析能力，非常受欢迎
这里分享一下 Elasticsearch 的安装方法
参考 Installation
Tip: 当前版本 Version:6.1.3
操作
系统环境
代码语言：javascript复制[root@much ~]# hostnamectl
Static hostname: much
Icon name: computer-vm
Chassis: vm
Machine ID: 33dc28f7e76c4903ad9b603b77e29a7c
Boot ID: f49ec5c0cb7940328cbc5b9d6ca0a526
Virtualization: kvm
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-514.21.1.el7.x86_64
Architecture: x86-64
[root@much ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:d1:5d:f7 brd ff:ff:ff:ff:ff:ff
inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic enp0s3
valid_lft 80858sec preferred_lft 80858sec
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:47:20:56 brd ff:ff:ff:ff:ff:ff
inet 192.168.56.208/24 brd 192.168.56.255 scope global enp0s8
valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
link/ether 52:54:00:16:5e:11 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
link/ether 52:54:00:16:5e:11 brd ff:ff:ff:ff:ff:ff
[root@much ~]#依赖
Elasticsearch 需要 Java８ 的支持
官方建议使用 Oracle JDK version 1.8.0_131
代码语言：javascript复制Elasticsearch requires at least Java 8. Specifically as of this writing, it is recommended that you use the Oracle JDK version 1.8.0_131
[root@much ~]# 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)
[root@much ~]#我本地的是 openjdk version “1.8.0_151” ，这个是 OpenJDK，并非 Oracle 版的，不过也没啥大问题，比推荐的 1.8.0_131 还新
下载安装包
首先下载安装包
下载地址 Download Elasticsearch
代码语言：javascript复制[root@much es]# wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.1.3.rpm
--2018-02-01 20:22:51-- https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.1.3.rpm
Resolving artifacts.elastic.co (artifacts.elastic.co)... 23.21.118.61, 184.72.218.26, 184.72.242.47, ...
Connecting to artifacts.elastic.co (artifacts.elastic.co)|23.21.118.61|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 28411530 (27M) [application/octet-stream]
Saving to: ‘elasticsearch-6.1.3.rpm’
100%[======================================>] 28,411,530 59.5KB/s in 28m 3s
2018-02-01 20:51:02 (16.5 KB/s) - ‘elasticsearch-6.1.3.rpm’ saved [28411530/28411530]
[root@much es]# ls
elasticsearch-6.1.3.rpm
[root@much es]#安装
直接使用 rpm 进行安装
代码语言：javascript复制[root@much es]# rpm -ivh elasticsearch-6.1.3.rpm
Preparing... ################################# [100%]
Creating elasticsearch group... OK
Creating elasticsearch user... OK
Updating / installing...
1:elasticsearch-0:6.1.3-1 ################################# [100%]
### NOT starting on installation, please execute the following statements to configure elasticsearch service to start automatically using systemd
sudo systemctl daemon-reload
sudo systemctl enable elasticsearch.service
### You can start elasticsearch service by executing
sudo systemctl start elasticsearch.service
[root@much es]#运行
根据提示加载服务，并且使它下次自动运行
代码语言：javascript复制[root@much es]# systemctl daemon-reload
[root@much es]# systemctl enable elasticsearch.service
Created symlink from /etc/systemd/system/multi-user.target.wants/elasticsearch.service to /usr/lib/systemd/system/elasticsearch.service.
[root@much es]# ps faux | grep -i elast
root 5402 0.0 0.0 112648 1028 pts/0 S 20:59 0:00 | _ grep --color=auto -i elast
[root@much es]# netstat -ant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 192.168.56.208:22 192.168.56.1:53858 ESTABLISHED
tcp 0 0 192.168.56.208:22 192.168.56.1:53368 ESTABLISHED
tcp 0 0 10.0.2.15:42342 54.225.188.6:443 ESTABLISHED
tcp 32 0 10.0.2.15:42566 54.235.82.130:443 CLOSE_WAIT
tcp 0 0 192.168.56.208:22 192.168.56.1:53128 ESTABLISHED
tcp 0 0 10.0.2.15:36934 184.72.242.47:443 ESTABLISHED
tcp6 0 0 :::22 :::* LISTEN
[root@much es]# systemctl start elasticsearch.service
[root@much es]# ps faux | grep -i elast
root 5480 0.0 0.0 112648 1028 pts/0 S 21:00 0:00 | _ grep --color=auto -i elast
elastic 5436 135 29.3 3614912 1187844 ? Ssl 21:00 0:05 /bin/java -Xms1g -Xmx1g -XX: UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX: UseCMSInitiatingOccupancyOnly -XX: AlwaysPreTouch -server -Xss1m -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djna.nosys=true -XX:-OmitStackTraceInFastThrow -Dio.netty.noUnsafe=true -Dio.netty.noKeySetOptimization=true -Dio.netty.recycler.maxCapacityPerThread=0 -Dlog4j.shutdownHookEnabled=false -Dlog4j2.disable.jmx=true -XX: HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/lib/elasticsearch -Des.path.home=/usr/share/elasticsearch -Des.path.conf=/etc/elasticsearch -cp /usr/share/elasticsearch/lib/* org.elasticsearch.bootstrap.Elasticsearch -p /var/run/elasticsearch/elasticsearch.pid --quiet
[root@much es]# netstat -ant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:9200 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:9300 0.0.0.0:* LISTEN
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 192.168.56.208:22 192.168.56.1:53858 ESTABLISHED
tcp 0 0 192.168.56.208:22 192.168.56.1:53368 ESTABLISHED
tcp 0 0 10.0.2.15:42342 54.225.188.6:443 ESTABLISHED
tcp 32 0 10.0.2.15:42566 54.235.82.130:443 CLOSE_WAIT
tcp 0 0 192.168.56.208:22 192.168.56.1:53128 ESTABLISHED
tcp 0 0 10.0.2.15:36934 184.72.242.47:443 ESTABLISHED
tcp6 0 0 :::22 :::* LISTEN
[root@much es]#可见实例已经运行起来了，并且监听在本地的 9200 9300 端口
查看集群状态
代码语言：javascript复制[root@much es]# curl 'localhost:9200/_cat/health?v'
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1517490762 21:12:42 elasticsearch green 1 1 0 0 0 0 0 0 - 100.0%
[root@much es]#代码语言：javascript复制Tips: 可以使用 help 参数来查看 title 的解释
[root@much es]# curl 'localhost:9200/_cat/health?help'
epoch | t,time | seconds since 1970-01-01 00:00:00
timestamp | ts,hms,hhmmss | time in HH:MM:SS
cluster | cl | cluster name
status | st | health status
node.total | nt,nodeTotal | total number of nodes
node.data | nd,nodeData | number of nodes that can store data
shards | t,sh,shards.total,shardsTotal | total number of shards
pri | p,shards.primary,shardsPrimary | number of primary shards
relo | r,shards.relocating,shardsRelocating | number of relocating nodes
init | i,shards.initializing,shardsInitializing | number of initializing nodes
unassign | u,shards.unassigned,shardsUnassigned | number of unassigned shards
pending_tasks | pt,pendingTasks | number of pending tasks
max_task_wait_time | mtwt,maxTaskWaitTime | wait time of longest task pending
active_shards_percent | asp,activeShardsPercent | active number of shards in percent
[root@much es]#查看节点
代码语言：javascript复制[root@much es]# curl 'localhost:9200/_cat/nodes?v'
ip heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
127.0.0.1 9 93 0 0.00 0.03 0.05 mdi * cOdZg7-
[root@much es]#其它的 _cat API 可以参看 cat APIs
总结
使用 rpm 包安装的过程非常简单
这是一个不涉及配置的单实例集群环境
