在之前 ElasticSearch 搭建好之后，我们通过 elasticsearch-header 插件在查看 ES 服务的时候，发现 cluster-health 显示的是 YELLOW。
Why？
首先，我们需要知道的是：颜色代表集群的健康状态。现在的颜色状态有：
* RED(红): 代表具体的分片还没有在集群中分配好；
* YELLOW(黄): 代表主分片已经分配好，但是副本尚未分配；
* GREEN(绿)：表示所有的分片都已分配好，群集正常运行；
有了以上的简介之后，笔者觉得，单节点导致显示的 YELLOW 还可以完善，所以开始搭建 ** ES Cluster **。
首先，我们需要更新之前的配置。进入之前的解压目录，打开配置文件：
vim elasticsearch.yml
我们需要更新这样几个参数：
node.name： 指定当前节点的名称。我现在有两台机子，可以设置两个节点，所以，这里一个起名为 master，一个为 node1;
node.master: 指定主节点。值一个设置为 true，另一个为 false；
discovery.zen.ping.unicast.hosts：这里设置的是节点的 ip，或者自己配置 hosts 文件，指定 ip映射关系，直接写ip对应的名称；
discovery.zen.minimum_master_nodes：这里，我的主节点是1个，所以我在这配置的是 1；具体的可以参考
在主节点配置好后，通过 scp 传输到 node1 节点上面，参数也做相应的改变即可。比如 node.name 更新成 node1， node.master: false。其他的保持一致。
我目前的主节点配置如下：
# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
#
Before you
set out to tweak
and tune the configuration, make sure you
#
understand what
are you trying
to accomplish
and the consequences.
#
# The primary way
of configuring a node
is via this
file. This
template lists
# the most important
settings you may want
to configure
for a production cluster.
#
# Please consult the documentation
for further information
on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/
reference/
index.html
#
#
---------------------------------- Cluster -----------------------------------
#
#
Use a descriptive
name for your cluster:
#
#cluster.
name: my-application
cluster.
name: es-demo
#
#
------------------------------------ Node ------------------------------------
#
#
Use a descriptive
name for the node:
#
#node.
name: node
-1
node.
name:
master
node.
master:
true
#
#
Add custom
attributes to the node:
#
#node.
attr.rack: r1
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: /
data/elasticsearch
#
#
Path to log files:
#
#
path.
logs: /
path/
to/
logs
path.
logs: /
data/
logs/elasticsearch
#
#
----------------------------------- 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:
192.168.1.58 # 从节点成对应的 ip
#
#
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: [
"192.168.1.58",
"192.168.1.54"]
#
# Prevent the
"split brain" by configuring the majority
of nodes (total
number of master-eligible nodes /
2 +
1):
#
discovery.zen.minimum_master_nodes:
1
#
#
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
#
--------------------------------- 其他配置 -----------------------------------
http.cors.enabled:
true
http.cors.
allow-origin:
"*"
