forked from elastic/built-docs
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy path_rolling_restarts.html
273 lines (255 loc) · 13.4 KB
/
_rolling_restarts.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="UTF-8">
<title>Rolling Restarts | Elasticsearch: The Definitive Guide [2.x] | Elastic</title>
<meta class="elastic" name="content" content="Rolling Restarts | Elasticsearch: The Definitive Guide [2.x]">
<link rel="home" href="index.html" title="Elasticsearch: The Definitive Guide [2.x]"/>
<link rel="up" href="post_deploy.html" title="Post-Deployment"/>
<link rel="prev" href="_delaying_shard_allocation.html" title="Delaying Shard Allocation"/>
<link rel="next" href="backing-up-your-cluster.html" title="Backing Up Your Cluster"/>
<meta class="elastic" name="product_version" content="2.x"/>
<meta class="elastic" name="product_name" content="Elasticsearch"/>
<meta class="elastic" name="website_area" content="documentation"/>
<meta name="DC.type" content="Learn/Docs/Legacy/Elasticsearch/Definitive Guide/2.x"/>
<meta name="DC.subject" content="Elasticsearch"/>
<meta name="DC.identifier" content="2.x"/>
<meta name="robots" content="noindex,nofollow"/>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://cdn.optimizely.com/js/18132920325.js"></script>
<link rel="apple-touch-icon" sizes="57x57" href="/apple-icon-57x57.png">
<link rel="apple-touch-icon" sizes="60x60" href="/apple-icon-60x60.png">
<link rel="apple-touch-icon" sizes="72x72" href="/apple-icon-72x72.png">
<link rel="apple-touch-icon" sizes="76x76" href="/apple-icon-76x76.png">
<link rel="apple-touch-icon" sizes="114x114" href="/apple-icon-114x114.png">
<link rel="apple-touch-icon" sizes="120x120" href="/apple-icon-120x120.png">
<link rel="apple-touch-icon" sizes="144x144" href="/apple-icon-144x144.png">
<link rel="apple-touch-icon" sizes="152x152" href="/apple-icon-152x152.png">
<link rel="apple-touch-icon" sizes="180x180" href="/apple-icon-180x180.png">
<link rel="icon" type="image/png" href="/favicon-32x32.png" sizes="32x32">
<link rel="icon" type="image/png" href="/android-chrome-192x192.png" sizes="192x192">
<link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96">
<link rel="icon" type="image/png" href="/favicon-16x16.png" sizes="16x16">
<link rel="manifest" href="/manifest.json">
<meta name="apple-mobile-web-app-title" content="Elastic">
<meta name="application-name" content="Elastic">
<meta name="msapplication-TileColor" content="#ffffff">
<meta name="msapplication-TileImage" content="/mstile-144x144.png">
<meta name="theme-color" content="#ffffff">
<meta name="naver-site-verification" content="936882c1853b701b3cef3721758d80535413dbfd" />
<meta name="yandex-verification" content="d8a47e95d0972434" />
<meta name="localized" content="true" />
<meta name="st:robots" content="follow,index" />
<meta property="og:image" content="https://static-www.elastic.co/v3/assets/bltefdd0b53724fa2ce/blt280217a63b82a734/6202d3378b1f312528798412/elastic-logo.svg" />
<meta property="og:image:width" content="500" />
<meta property="og:image:height" content="172" />
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon">
<link rel="icon" href="/favicon.ico" type="image/x-icon">
<link rel="apple-touch-icon-precomposed" sizes="64x64" href="/favicon_64x64_16bit.png">
<link rel="apple-touch-icon-precomposed" sizes="32x32" href="/favicon_32x32.png">
<link rel="apple-touch-icon-precomposed" sizes="16x16" href="/favicon_16x16.png">
<!-- Give IE8 a fighting chance -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
<link rel="stylesheet" type="text/css" href="/guide/static/styles.css" />
</head>
<!--© 2015-2022 Elasticsearch B.V. -->
<!-- All Elastic documentation is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. -->
<!-- http://creativecommons.org/licenses/by-nc-nd/4.0/ -->
<body>
<!-- Google Tag Manager -->
<script>dataLayer = [];</script><noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-58RLH5" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= '//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-58RLH5');</script>
<!-- End Google Tag Manager -->
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-12395217-16"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-12395217-16');
</script>
<!-- Google Tag Manager for GA4 -->
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-KNJMG2M');</script>
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KNJMG2M" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- End Google Tag Manager for GA4-->
<div id='elastic-nav' style="display:none;"></div>
<script src='https://www.elastic.co/elastic-nav.js'></script>
<div class="main-container">
<section id="content" >
<div class="content-wrapper">
<section id="guide" lang="en">
<div class="container-fluid">
<div class="row pb-3">
<div class="col-12 order-2 col-md-4 order-md-1 col-lg-3 h-almost-full-md sticky-top-md" id="left_col">
<!-- The TOC is appended here -->
</div>
<div class="col-12 order-1 col-md-8 order-md-2 col-lg-7 order-lg-2 guide-section" id="middle_col">
<!-- start body -->
<div class="page_header">
<p>
<strong>WARNING</strong>: The 2.x versions of Elasticsearch have passed their
<a href="https://www.elastic.co/support/eol">EOL dates</a>. If you are running
a 2.x version, we strongly advise you to upgrade.
</p>
<p>
This documentation is no longer maintained and may be removed. For the latest
information, see the <a
href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html">current
Elasticsearch documentation</a>.
</p>
</div>
<div id="content">
<div class="breadcrumbs">
<span class="breadcrumb-link"><a href="/guide/">Elastic Docs</a></span>
<span class="chevron-right">›</span><span class="breadcrumb-link"><a href="index.html">Elasticsearch: The Definitive Guide [2.x]</a></span>
<span class="chevron-right">›</span><span class="breadcrumb-link"><a href="administration.html">Administration, Monitoring, and Deployment</a></span>
<span class="chevron-right">›</span><span class="breadcrumb-link"><a href="post_deploy.html">Post-Deployment</a></span>
</div>
<div class="navheader">
<span class="prev">
<a href="_delaying_shard_allocation.html">« Delaying Shard Allocation</a>
</span>
<span class="next">
<a href="backing-up-your-cluster.html">Backing Up Your Cluster »</a>
</span>
</div>
<div class="section pagebreak-before">
<div class="titlepage"><div><div>
<h2 class="title"><a id="_rolling_restarts"></a>Rolling Restarts<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch-definitive-guide/edit/2.x/520_Post_Deployment/40_rolling_restart.asciidoc">edit</a></h2>
</div></div></div>
<p>There will come a time when you need to perform a rolling restart of your
cluster—​keeping the cluster online and operational, but taking nodes offline
one at a time.</p>
<p>The common reason is either an Elasticsearch version upgrade, or some kind of
maintenance on the server itself (such as an OS update, or hardware). Whatever the case,
there is a particular method to perform a rolling restart.</p>
<p>By nature, Elasticsearch wants your data to be fully replicated and evenly balanced.
If you shut down a single node for maintenance, the cluster will
immediately recognize the loss of a node and begin rebalancing. This can be irritating
if you know the node maintenance is short term, since the rebalancing of
very large shards can take some time (think of trying to replicate 1TB—​even
on fast networks this is nontrivial).</p>
<p>What we want to do is tell Elasticsearch to hold off on rebalancing, because
we have more knowledge about the state of the cluster due to external factors.
The procedure is as follows:</p>
<div class="olist orderedlist">
<ol class="orderedlist">
<li class="listitem">
<p>If possible, stop indexing new data and perform a synced flush. This is not
always possible, but will help speed up recovery time. A synced flush request is
a “best effort” operation. It will fail if there are any pending indexing
operations, but it is safe to reissue the request multiple times if necessary.</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">POST /_flush/synced</pre>
</div>
</li>
<li class="listitem">
<p>Disable shard allocation. This prevents Elasticsearch from rebalancing
missing shards until you tell it otherwise. If you know the maintenance window will be
short, this is a good idea. You can disable allocation as follows:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">PUT /_cluster/settings
{
"transient" : {
"cluster.routing.allocation.enable" : "none"
}
}</pre>
</div>
</li>
<li class="listitem">
Shut down a single node.
</li>
<li class="listitem">
Perform a maintenance/upgrade.
</li>
<li class="listitem">
Restart the node, and confirm that it joins the cluster.
</li>
<li class="listitem">
<p>Reenable shard allocation as follows:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">PUT /_cluster/settings
{
"transient" : {
"cluster.routing.allocation.enable" : "all"
}
}</pre>
</div>
<p>Shard rebalancing may take some time. Wait until the cluster has returned
to status <code class="literal">green</code> before continuing.</p>
</li>
<li class="listitem">
Repeat steps 2 through 6 for the rest of your nodes.
</li>
<li class="listitem">
At this point you are safe to resume indexing (if you had previously stopped),
but waiting until the cluster is fully balanced before resuming indexing will help
to speed up the process.
</li>
</ol>
</div>
</div>
<div class="navfooter">
<span class="prev">
<a href="_delaying_shard_allocation.html">« Delaying Shard Allocation</a>
</span>
<span class="next">
<a href="backing-up-your-cluster.html">Backing Up Your Cluster »</a>
</span>
</div>
</div>
<!-- end body -->
</div>
<div class="col-12 order-3 col-lg-2 order-lg-3 h-almost-full-lg sticky-top-lg" id="right_col">
<div id="sticky_content">
<!-- The OTP is appended here -->
<div class="row">
<div class="col-0 col-md-4 col-lg-0" id="bottom_left_col"></div>
<div class="col-12 col-md-8 col-lg-12">
<div id="rtpcontainer">
<div class="mktg-promo" id="most-popular">
<p class="aside-heading">Most Popular</p>
<div class="pb-2">
<p class="media-type">Video</p>
<a href="https://www.elastic.co/webinars/getting-started-elasticsearch?page=docs&placement=top-video">
<p class="mb-0">Get Started with Elasticsearch</p>
</a>
</div>
<div class="pb-2">
<p class="media-type">Video</p>
<a href="https://www.elastic.co/webinars/getting-started-kibana?page=docs&placement=top-video">
<p class="mb-0">Intro to Kibana</p>
</a>
</div>
<div class="pb-2">
<p class="media-type">Video</p>
<a href="https://www.elastic.co/webinars/introduction-elk-stack?page=docs&placement=top-video">
<p class="mb-0">ELK for Logs & Metrics</p>
</a>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
</div>
<div id='elastic-footer'></div>
<script src='https://www.elastic.co/elastic-footer.js'></script>
<!-- Footer Section end-->
</section>
</div>
<script src="/guide/static/jquery.js"></script>
<script type="text/javascript" src="/guide/static/docs.js"></script>
<script type="text/javascript">
window.initial_state = {}</script>
</body>
</html>