Elasticsearch-安装、日志解读

ES-安装、日志解读

1. 准备tar包

https://www.elastic.co/cn/products/elasticsearch
2. 解压

tar -zxvf elasticsearch-2.3..tar.gz

3. 启动

bin/elasticsearch

启动日志如下

FengZhendeMacBook-Pro:bin FengZhen$ ./elasticsearch
[-- ::,][INFO ][node ] [Feng] version[2.3.], pid[], build[b9e4a6a/--21T16::47Z]
[-- ::,][INFO ][node ] [Feng] initializing ...
[-- ::,][INFO ][plugins ] [Feng] modules [reindex, lang-expression, lang-groovy], plugins [head], sites [head]
[-- ::,][INFO ][env ] [Feng] using [] data paths, mounts [[/ (/dev/disk1s1)]], net usable_space [.2gb], net total_space [.9gb], spins? [unknown], types [apfs]
[-- ::,][INFO ][env ] [Feng] heap size [.7mb], compressed ordinary object pointers [true]
[-- ::,][WARN ][env ] [Feng] max file descriptors [] for elasticsearch process likely too low, consider increasing to at least []
[-- ::,][INFO ][node ] [Feng] initialized
[-- ::,][INFO ][node ] [Feng] starting ...
[-- ::,][INFO ][transport ] [Feng] publish_address {127.0.0.1:}, bound_addresses {[fe80::]:}, {[::]:}, {127.0.0.1:}
[-- ::,][INFO ][discovery ] [Feng] elasticsearch/iA0avp_YTP-82cuMANvK8Q
[-- ::,][INFO ][cluster.service ] [Feng] new_master {Feng}{iA0avp_YTP-82cuMANvK8Q}{127.0.0.1}{127.0.0.1:}, reason: zen-disco-join(elected_as_master, [] joins received)
[-- ::,][INFO ][http ] [Feng] publish_address {127.0.0.1:}, bound_addresses {[fe80::]:}, {[::]:}, {127.0.0.1:}
[-- ::,][INFO ][node ] [Feng] started
[-- ::,][INFO ][gateway ] [Feng] recovered [] indices into cluster_state
[-- ::,][INFO ][cluster.routing.allocation] [Feng] Cluster health status changed from [RED] to [YELLOW] (reason: [shards started [[blog][], [blog][]] ...]).

4.日志解读：

（1）第一行提供了启动节点的统计信息

[-- ::,][INFO ][node ] [Feng] version[2.3.], pid[], build[b9e4a6a/--21T16::47Z]

默认情况下，ES为节点随机分配一个名字，可以在配置中修改。此处我修改为[Feng]，此处还可看到ES的版本号细节，还有所启动Java进程的PID。
（2）插件在初始化过程中被加载，默认情况下是没有插件的，此处插件有[head]

[-- ::,][INFO ][plugins ] [Feng] modules [reindex, lang-expression, lang-groovy], plugins [head], sites [head]

（3）端口9300默认用于节点之间的通信，称为transport：

[-- ::,][INFO ][transport ] [Feng] publish_address {127.0.0.1:}, bound_addresses {[fe80::]:}, {[::]:}, {127.0.0.1:}

如果使用本地Java API而不是REST API，需要连接这个端口。
（4）选举主节点，名为[Feng]的节点

[-- ::,][INFO ][cluster.service ] [Feng] new_master {Feng}{iA0avp_YTP-82cuMANvK8Q}{127.0.0.1}{127.0.0.1:}, reason: zen-disco-join(elected_as_master, [] joins received)

（5）端口9200默认用于HTTP的通信。应用程序使用REST API时连接这个端口

[-- ::,][INFO ][http ] [Feng] publish_address {127.0.0.1:}, bound_addresses {[fe80::]:}, {[::]:}, {127.0.0.1:}

（6）节点启动成功标志

[-- ::,][INFO ][node ] [Feng] started

（7）gateway是负责将数据持久化到磁盘的ES组件，这样就不会在节点宕机的时候丢失数据。

[-- ::,][INFO ][gateway ] [Feng] recovered [] indices into cluster_state

启动节点之后，gateway将查看磁盘来判断是否有数据在意外时保存过，这样可以恢复这些数据。

5. 请求9200端口，会获得一个JSON应答，表示ES正常工作。