Installation
参考文档：
https://www.elastic.co/guide/index.html
https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html
https://www.elastic.co/guide/en/elasticsearch/reference/current/_installation.html#_installation
https://www.elastic.co/guide/en/elasticsearch/reference/6.1/zip-targz.html
准备：
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.
java -version
echo $JAVA_HOME
部署系统：Linux（CentOS）
去官方网站下载 https://www.elastic.co
例如：https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.1.2.tar.gz
解压：
tar -xvf elasticsearch-6.1.2.tar.gz
前台启动：./bin/elasticsearch
后台启动：./bin/elasticsearch -d -p ./bin/pid
启动报错：
[2018-01-30T03:51:53,031][ERROR][o.e.b.Bootstrap ] [esnode03] node validation exception
[1] bootstrap checks failed
[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
解决方案：进行系统参数优化
这可以临时设置：sysctl -w vm.max_map_count=655350
或者在/etc/sysctl.conf下永久设置vm.max_map_count。
vm.max_map_count=655350直接写到/etc/sysctl.conf中,然后执行sysctl -p
查看设置
cat /proc/sys/vm/max_map_count
或者执行下面的脚本：
#!/bin/sh # # 系统参数优化，Execute Only Once # export PATH=$PATH:/sbin sudo sysctl -w vm.extra_free_kbytes=3000000 sudo sysctl -w vm.min_free_kbytes=1000000 sudo sysctl -w vm.overcommit_memory=1 sudo sysctl -w vm.drop_caches=1 sudo sysctl -w vm.zone_reclaim_mode=0 sudo sysctl -w vm.max_map_count=655360 sudo sysctl -w vm.dirty_background_ratio=50 sudo sysctl -w vm.dirty_ratio=50 sudo sysctl -w vm.dirty_writeback_centisecs=360000 sudo sysctl -w vm.page-cluster=3 sudo sysctl -w vm.swappiness=0 sudo sysctl -w vm.max_map_count=655350 echo 'ulimit -n 655350' >> /etc/profile echo '* hard nofile 655350' >> /etc/security/limits.conf echo '* hard memlock unlimited' >> /etc/security/limits.conf echo '* soft memlock unlimited' >> /etc/security/limits.conf
补充，对内存小于40G的机器，调小这个值：
sudo sysctl -w vm.min_free_kbytes=512000
参见：https://www.cnblogs.com/muahao/p/8082997.html
关于系统参数设置，官方文档有详细说明：
https://www.elastic.co/guide/en/elasticsearch/reference/6.1/setting-system-settings.html
https://www.elastic.co/guide/en/elasticsearch/reference/6.1/max-number-of-threads.html
集群配置
配置示例如下：
# ======================== Elasticsearch Configuration ========================= # # ---------------------------------- Cluster ----------------------------------- # # Use a descriptive name for your cluster: # #cluster.name: my-application cluster.name: escluster # # ------------------------------------ Node ------------------------------------ # # Use a descriptive name for the node: # #node.name: node-1 node.name: esnode03 # # Add custom attributes to the node: # #node.attr.rack: r1 # # ----------------------------------- Paths ------------------------------------ # # Path to directory where to store the data (separate multiple locations by comma): # #path.data: /path/to/data path.data: /home/admin/esdata/data # # Path to log files: # #path.logs: /path/to/logs path.logs: /home/admin/esdata/logs # # ----------------------------------- Memory ----------------------------------- # # Lock the memory on startup: # #bootstrap.memory_lock: true # # Make sure that the heap size is set to about half the memory available # on the system and that the owner of the process is allowed to use this # limit. # # Elasticsearch performs poorly when the system is swapping the memory. # # ---------------------------------- Network ----------------------------------- # # Set the bind address to a specific IP (IPv4 or IPv6): # #network.host: 192.168.0.1 network.host: 192.168.11.242 # # 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: ["192.168.11.242", "192.168.11.249", "192.168.11.250"] # # Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1): # discovery.zen.minimum_master_nodes: 2 # # For more information, consult the zen discovery module documentation. # # ---------------------------------- Gateway ----------------------------------- # # Block initial recovery after a full cluster restart until N nodes are started: # gateway.recover_after_nodes: 3 # # For more information, consult the gateway module documentation. # # ---------------------------------- Various ----------------------------------- # # Require explicit names when deleting indices: # #action.destructive_requires_name: true
不懂的配置，比如minimum_master_nodes，可以参考官方说明，或者百度：
https://www.elastic.co/guide/en/elasticsearch/reference/6.1/important-settings.html
测试
查看节点状态：
curl -XGET 'http://192.168.11.242:9200/_cat/nodes?pretty'
192.168.11.242 17 41 0 0.00 0.01 0.05 mdi * esnode03 192.168.11.250 9 20 0 0.00 0.01 0.03 mdi - esnode02 192.168.11.249 14 20 0 0.00 0.01 0.03 mdi - esnode01
查询更多支持的命令：
curl -XGET 'http://192.168.11.242:9200/_cat?pretty'
/_cat/allocation
/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/tasks
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/thread_pool/{thread_pools}
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
/_cat/nodeattrs
/_cat/repositories
/_cat/snapshots/{repository}
/_cat/templates查看集群状态;
curl -XGET http://192.168.11.242:9200/_cluster/health?pretty
API文档参见：
https://www.elastic.co/guide/en/elasticsearch/reference/6.1/cat-health.html
https://www.elastic.co/guide/en/elasticsearch/reference/6.1/cluster-health.html
关闭
jps获取进程pid，然后kill -SIGTERM pid
性能测试
官方提供了测试工具和测试方法：
https://www.elastic.co/guide/en/elasticsearch/reference/6.1/testing-framework.html
生产部署，优化建议
参见：http://blog.csdn.net/thomas0yang/article/details/55518105
集群原理：http://blog.csdn.net/zwgdft/article/details/54585644
安装 elasticsearch Head 插件，方便查看es里面的数据
参见：https://www.cnblogs.com/aubin/p/8018081.html
官方地址：https://github.com/mobz/elasticsearch-head
注意配置：
vim elasticsearch.yml
http.cors.enabled: true # elasticsearch中启用 CORShttp.cors.allow-origin: "*" # 允许访问的IP地址段，* 为所有IP都