MediaWiki Extension CirrusSearch and Elasticsearch Setup
From WikiMLT
This is a short manual how to set-up Elasticsearch to be used with the MediaWiki's extension CirrusSearch which communicate to the service by the extension Elastica. You should choice an appropriate Elasticsearch version depending on your MediaWiki version. Currently I'm using MediaWiki 1.38 and it is recommended to use Elasticsearch 6.8.23+ with it. This version runs well over openjdk-11 which is the default Java version on Ubuntu Server 22.04.
Elasticsearch and the extension Elastica are required by some other MediaWiki extensions as extension Translate where it is used as translation memory. It is also used by the NextCoud's application Full text search and more…
Java and Javac
On Ubuntu Server the default jdk and jre packages can be installed by the following command.
sudo apt install -y apt-transport-https default-jdk default-jre
To check and switch the current version of Java and Javac you can use the following commands.
sudo update-alternatives --config java
#Output
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto mode
* 1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode
2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number: 1
sudo update-alternatives --config javac
#Output
There are 2 choices for the alternative javac (providing /usr/bin/javac).
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-11-openjdk-amd64/bin/javac 1111 auto mode
* 1 /usr/lib/jvm/java-11-openjdk-amd64/bin/javac 1111 manual mode
2 /usr/lib/jvm/java-8-openjdk-amd64/bin/javac 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number: 1
If you are using Elasticsearch 5.x it requires openjdk‑8 which can be installed by the following commands. After the installation use the above commands to switch the version in use.
#Details
sudo apt install openjdk-8-jre-headless
sudo apt install openjdk-8-jdk-headless
After switching the version of Java you need to restart the Elasticsearch service if it is already installed.
sudo systemctl restart elasticsearch.service
curl 'http://127.0.0.1:9200' # do a test
Elasticsearch
Installation
There is a couple of ways how to Installing Elasticsearch – via Docker, via Apt repository, via .deb or .rpm packages, etc. I prefer to manually download and install it via .deb package. Is I said before for MediaWiki 1.38 we need version 6.8.23+.
cd ~/Downloads
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.8.23.deb
sudo apt install ./elasticsearch-6.8.23.deb
#Versions
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.16.deb
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.4.deb
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.0.1-amd64.deb
After installing the package the Elasticsearch service must be enabled and started.
sudo systemctl enable --now elasticsearch.service # enable and start the service
systemctl status elasticsearch.service # check the status of the service
systemctl cat elasticsearch.service # check the current service's configuration
Check
You can check does the service work properly by the following approach.
curl 'http://127.0.0.1:9200'
#Output
{
"name" : "W2uxKNc",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "JwkNoPi_THuiCA123-HKMg",
"version" : {
"number" : "6.8.23",
"build_flavor" : "default",
"build_type" : "deb",
"build_hash" : "4f67856",
"build_date" : "2022-01-06T21:30:50.087716Z",
"build_snapshot" : false,
"lucene_version" : "7.7.3",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}
More detailed information can be obtained by the next command.
curl -XGET 'http://localhost:9200/_nodes?pretty'
#Output
{
"_nodes" : {
"total" : 1,
"successful" : 1,
"failed" : 0
},
"cluster_name" : "elasticsearch",
"nodes" : {
"W2uxKNc9SQqZSVN4RIZmNg" : {
"name" : "W2uxKNc",
"transport_address" : "127.0.0.1:9300",
"host" : "127.0.0.1",
"ip" : "127.0.0.1",
"version" : "6.8.23",
"build_flavor" : "default",
"build_type" : "deb",
"build_hash" : "4f67856",
"total_indexing_buffer" : 418159001,
"roles" : [
"master",
"data",
"ingest"
],
"attributes" : {
"ml.machine_memory" : "24456527872",
"xpack.installed" : "true",
"ml.max_open_jobs" : "20",
"ml.enabled" : "true"
},
"settings" : {
"pidfile" : "/var/run/elasticsearch/elasticsearch.pid",
"cluster" : {
"name" : "elasticsearch"
},
"node" : {
"attr" : {
"xpack" : {
"installed" : "true"
},
"ml" : {
"machine_memory" : "24456527872",
"max_open_jobs" : "20",
"enabled" : "true"
}
},
"name" : "W2uxKNc"
},
"path" : {
"data" : [
"/var/lib/elasticsearch"
],
"logs" : "/var/log/elasticsearch",
"home" : "/usr/share/elasticsearch"
},
"client" : {
"type" : "node"
},
"http" : {
"type" : "security4",
"type.default" : "netty4"
},
"transport" : {
"type" : "security4",
"features" : {
"x-pack" : "true"
},
"type.default" : "netty4"
}
},
"os" : {
"refresh_interval_in_millis" : 1000,
"name" : "Linux",
"pretty_name" : "Ubuntu 22.04.1 LTS",
"arch" : "amd64",
"version" : "5.15.0-46-generic",
"available_processors" : 16,
"allocated_processors" : 16
},
"process" : {
"refresh_interval_in_millis" : 1000,
"id" : 1041,
"mlockall" : false
},
"jvm" : {
"pid" : 1041,
"version" : "11.0.16",
"vm_name" : "OpenJDK 64-Bit Server VM",
"vm_version" : "11.0.16+8-post-Ubuntu-0ubuntu122.04",
"vm_vendor" : "Ubuntu",
"start_time_in_millis" : 1661769755777,
"mem" : {
"heap_init_in_bytes" : 4294967296,
"heap_max_in_bytes" : 4181590016,
"non_heap_init_in_bytes" : 7667712,
"non_heap_max_in_bytes" : 0,
"direct_max_in_bytes" : 0
},
"gc_collectors" : [
"ParNew",
"ConcurrentMarkSweep"
],
"memory_pools" : [
"CodeHeap 'non-nmethods'",
"Metaspace",
"CodeHeap 'profiled nmethods'",
"Compressed Class Space",
"Par Eden Space",
"Par Survivor Space",
"CodeHeap 'non-profiled nmethods'",
"CMS Old Gen"
],
"using_compressed_ordinary_object_pointers" : "true",
"input_arguments" : [
"-Xms4g",
"-Xmx4g",
"-XX:+UseConcMarkSweepGC",
"-XX:CMSInitiatingOccupancyFraction=75",
"-XX:+UseCMSInitiatingOccupancyOnly",
"-Des.networkaddress.cache.ttl=60",
"-Des.networkaddress.cache.negative.ttl=10",
"-XX:+AlwaysPreTouch",
"-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",
"-Dlog4j2.formatMsgNoLookups=true",
"-Djava.io.tmpdir=/tmp/elasticsearch-14060835447651286248",
"-XX:+HeapDumpOnOutOfMemoryError",
"-XX:HeapDumpPath=/var/lib/elasticsearch",
"-XX:ErrorFile=/var/log/elasticsearch/hs_err_pid%p.log",
"-Djava.locale.providers=COMPAT",
"-XX:UseAVX=2",
"-Des.path.home=/usr/share/elasticsearch",
"-Des.path.conf=/etc/elasticsearch",
"-Des.distribution.flavor=default",
"-Des.distribution.type=deb"
]
},
"thread_pool" : {
"watcher" : {
"type" : "fixed",
"min" : 50,
"max" : 50,
"queue_size" : 1000
},
"force_merge" : {
"type" : "fixed",
"min" : 1,
"max" : 1,
"queue_size" : -1
},
"security-token-key" : {
"type" : "fixed",
"min" : 1,
"max" : 1,
"queue_size" : 1000
},
"ml_datafeed" : {
"type" : "fixed",
"min" : 20,
"max" : 20,
"queue_size" : 200
},
"fetch_shard_started" : {
"type" : "scaling",
"min" : 1,
"max" : 32,
"keep_alive" : "5m",
"queue_size" : -1
},
"listener" : {
"type" : "fixed",
"min" : 8,
"max" : 8,
"queue_size" : -1
},
"ml_autodetect" : {
"type" : "fixed",
"min" : 80,
"max" : 80,
"queue_size" : 80
},
"index" : {
"type" : "fixed",
"min" : 16,
"max" : 16,
"queue_size" : 200
},
"refresh" : {
"type" : "scaling",
"min" : 1,
"max" : 8,
"keep_alive" : "5m",
"queue_size" : -1
},
"generic" : {
"type" : "scaling",
"min" : 4,
"max" : 128,
"keep_alive" : "30s",
"queue_size" : -1
},
"rollup_indexing" : {
"type" : "fixed",
"min" : 4,
"max" : 4,
"queue_size" : 4
},
"warmer" : {
"type" : "scaling",
"min" : 1,
"max" : 5,
"keep_alive" : "5m",
"queue_size" : -1
},
"search" : {
"type" : "fixed_auto_queue_size",
"min" : 25,
"max" : 25,
"queue_size" : 1000
},
"ccr" : {
"type" : "fixed",
"min" : 32,
"max" : 32,
"queue_size" : 100
},
"flush" : {
"type" : "scaling",
"min" : 1,
"max" : 5,
"keep_alive" : "5m",
"queue_size" : -1
},
"fetch_shard_store" : {
"type" : "scaling",
"min" : 1,
"max" : 32,
"keep_alive" : "5m",
"queue_size" : -1
},
"management" : {
"type" : "scaling",
"min" : 1,
"max" : 5,
"keep_alive" : "5m",
"queue_size" : -1
},
"ml_utility" : {
"type" : "fixed",
"min" : 80,
"max" : 80,
"queue_size" : 500
},
"get" : {
"type" : "fixed",
"min" : 16,
"max" : 16,
"queue_size" : 1000
},
"analyze" : {
"type" : "fixed",
"min" : 1,
"max" : 1,
"queue_size" : 16
},
"write" : {
"type" : "fixed",
"min" : 16,
"max" : 16,
"queue_size" : 200
},
"snapshot" : {
"type" : "scaling",
"min" : 1,
"max" : 5,
"keep_alive" : "5m",
"queue_size" : -1
},
"search_throttled" : {
"type" : "fixed_auto_queue_size",
"min" : 1,
"max" : 1,
"queue_size" : 100
}
},
"transport" : {
"bound_address" : [
"[::1]:9300",
"127.0.0.1:9300"
],
"publish_address" : "127.0.0.1:9300",
"profiles" : { }
},
"http" : {
"bound_address" : [
"[::1]:9200",
"127.0.0.1:9200"
],
"publish_address" : "127.0.0.1:9200",
"max_content_length_in_bytes" : 104857600
},
"plugins" : [ ],
"modules" : [
{
"name" : "aggs-matrix-stats",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Adds aggregations whose input are a list of numeric fields and output includes a matrix.",
"classname" : "org.elasticsearch.search.aggregations.matrix.MatrixAggregationPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "analysis-common",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Adds \"built in\" analyzers to Elasticsearch.",
"classname" : "org.elasticsearch.analysis.common.CommonAnalysisPlugin",
"extended_plugins" : [
"lang-painless"
],
"has_native_controller" : false
},
{
"name" : "ingest-common",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Module for ingest processors that do not require additional security permissions or have large dependencies and resources",
"classname" : "org.elasticsearch.ingest.common.IngestCommonPlugin",
"extended_plugins" : [
"lang-painless"
],
"has_native_controller" : false
},
{
"name" : "ingest-geoip",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Ingest processor that uses looksup geo data based on ip adresses using the Maxmind geo database",
"classname" : "org.elasticsearch.ingest.geoip.IngestGeoIpPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "ingest-user-agent",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Ingest processor that extracts information from a user agent",
"classname" : "org.elasticsearch.ingest.useragent.IngestUserAgentPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "lang-expression",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Lucene expressions integration for Elasticsearch",
"classname" : "org.elasticsearch.script.expression.ExpressionPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "lang-mustache",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Mustache scripting integration for Elasticsearch",
"classname" : "org.elasticsearch.script.mustache.MustachePlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "lang-painless",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "An easy, safe and fast scripting language for Elasticsearch",
"classname" : "org.elasticsearch.painless.PainlessPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "mapper-extras",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Adds advanced field mappers",
"classname" : "org.elasticsearch.index.mapper.MapperExtrasPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "parent-join",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "This module adds the support parent-child queries and aggregations",
"classname" : "org.elasticsearch.join.ParentJoinPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "percolator",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Percolator module adds capability to index queries and query these queries by specifying documents",
"classname" : "org.elasticsearch.percolator.PercolatorPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "rank-eval",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "The Rank Eval module adds APIs to evaluate ranking quality.",
"classname" : "org.elasticsearch.index.rankeval.RankEvalPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "reindex",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "The Reindex module adds APIs to reindex from one index to another or update documents in place.",
"classname" : "org.elasticsearch.index.reindex.ReindexPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "repository-url",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Module for URL repository",
"classname" : "org.elasticsearch.plugin.repository.url.URLRepositoryPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "transport-netty4",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Netty 4 based transport implementation",
"classname" : "org.elasticsearch.transport.Netty4Plugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "tribe",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Tribe module",
"classname" : "org.elasticsearch.tribe.TribePlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "x-pack-ccr",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - CCR",
"classname" : "org.elasticsearch.xpack.ccr.Ccr",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-core",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Core",
"classname" : "org.elasticsearch.xpack.core.XPackPlugin",
"extended_plugins" : [ ],
"has_native_controller" : false
},
{
"name" : "x-pack-deprecation",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Deprecation",
"classname" : "org.elasticsearch.xpack.deprecation.Deprecation",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-graph",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Graph",
"classname" : "org.elasticsearch.xpack.graph.Graph",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-ilm",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Index Lifecycle Management",
"classname" : "org.elasticsearch.xpack.indexlifecycle.IndexLifecycle",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-logstash",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Logstash",
"classname" : "org.elasticsearch.xpack.logstash.Logstash",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-ml",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Machine Learning",
"classname" : "org.elasticsearch.xpack.ml.MachineLearning",
"extended_plugins" : [
"x-pack-core",
"lang-painless"
],
"has_native_controller" : true
},
{
"name" : "x-pack-monitoring",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Monitoring",
"classname" : "org.elasticsearch.xpack.monitoring.Monitoring",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-rollup",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Rollup",
"classname" : "org.elasticsearch.xpack.rollup.Rollup",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-security",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Security",
"classname" : "org.elasticsearch.xpack.security.Security",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-sql",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "The Elasticsearch plugin that powers SQL for Elasticsearch",
"classname" : "org.elasticsearch.xpack.sql.plugin.SqlPlugin",
"extended_plugins" : [
"x-pack-core",
"lang-painless"
],
"has_native_controller" : false
},
{
"name" : "x-pack-upgrade",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Upgrade",
"classname" : "org.elasticsearch.xpack.upgrade.Upgrade",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
},
{
"name" : "x-pack-watcher",
"version" : "6.8.23",
"elasticsearch_version" : "6.8.23",
"java_version" : "1.8",
"description" : "Elasticsearch Expanded Pack Plugin - Watcher",
"classname" : "org.elasticsearch.xpack.watcher.Watcher",
"extended_plugins" : [
"x-pack-core"
],
"has_native_controller" : false
}
],
"ingest" : {
"processors" : [
{
"type" : "append"
},
{
"type" : "bytes"
},
{
"type" : "convert"
},
{
"type" : "date"
},
{
"type" : "date_index_name"
},
{
"type" : "dissect"
},
{
"type" : "dot_expander"
},
{
"type" : "drop"
},
{
"type" : "fail"
},
{
"type" : "foreach"
},
{
"type" : "geoip"
},
{
"type" : "grok"
},
{
"type" : "gsub"
},
{
"type" : "join"
},
{
"type" : "json"
},
{
"type" : "kv"
},
{
"type" : "lowercase"
},
{
"type" : "pipeline"
},
{
"type" : "remove"
},
{
"type" : "rename"
},
{
"type" : "script"
},
{
"type" : "set"
},
{
"type" : "set_security_user"
},
{
"type" : "sort"
},
{
"type" : "split"
},
{
"type" : "trim"
},
{
"type" : "uppercase"
},
{
"type" : "urldecode"
},
{
"type" : "user_agent"
}
]
}
}
}
}
Tweaks
Elasticsearch could use huge amount of RAM. But, I've tested it for thin instances it work even with only 128m. The main configuration file is /etc/elasticsearch/jvm.options and you can tweak the amount of Ram in use my tweaking the relevant lines as follow. Note Xms and Xmx values must be equal.
sudo nano /etc/elasticsearch/jvm.options
# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space
#-Xms512m
#-Xmx512m
-Xms4g
-Xmx4g
Add restart always directive to the Elasticsearch's systemd unit.
sudo systemctl edit elasticsearch.service
[Service]
# SZS/MLT Tweak
Restart=always
RestartSec=3
To apply the changes use the following commands.
sudo systemctl daemon-reload
sudo systemctl restart elasticsearch.service
systemctl status elasticsearch.service
systemctl cat elasticsearch.service
MediaWiki
За да започне регулярно индексиране на съдържанието на уикито, спрямо конфигурацията, направена в /var/www/*/LocalSettings.php и документацията на mw:Extension:CirrusSearch трябва да направи първоначална индексация, да се изпълнят задачите, които ще създаде тя, да се регенерира индекса на съдържанието и отново да се изпразни опашката със задачите. За целта могат да се използват скриптовете за поддръжка, описани в секцията MediaWiki.
mw-maintenance-elasticsearch-index.sh
mw-maintenance-runJobs.sh cli
mw-maintenance-rebuildAll.sh
mw-maintenance-runJobs.sh cli
В допълнение е разработен скрипта elasticsearch-watch.sh, като чрез crontab задача се прави периодична проверка и при необходимост рестартиране. Скрипта изпраща писмо до vectoria@altclavis.com, ако настъпи събитие.
sudo crontab -e
# ElasticSearch Watch
*/5 * * * * /usr/local/bin/elasticsearch-watch.sh
Access Elasticsearch via SSH Tunel
Using such approach is suitable only for test purpose, here is a manual how to set-up:
References
- BitLaunch: How to install Elasticsearch on Ubuntu 20.04 LTS
- Computing for Geeks: Install Elasticsearch 6.x on Ubuntu 18.04 LTS
- Media Wiki: Extension:CirrusSearch
- Phabricator: Extension:CirrusSearch
- Media Wiki: CirrusSearch Talk – Java version compatibility
- Mincong's blog: GC in Elasticsearch – Basic information about garbage collection (GC) in Elasticsearch, JVM options, GC logging
- Foojay.io: Handling JDK & GC Options Dynamically in Elasticsearch
- Elasticsearch Documentation: Important Elasticsearch configuration
- Elasticsearch Documentation: GC logging
