You must install and configure Elasticsearch before upgrading to Magento 2.4.x.
Refer to the System Requirements for specific version information.
Magento does not support Elasticsearch 2.x, 5.x, and 6.x.
We recommend the following:
Elasticsearch on different hosts
All of the following tasks we discuss assume you have configured your system this way.
The preceding diagram shows:
The Magento application and Elasticsearch are installed on different hosts.
Running on separate hosts requires proxying to work. (Clustering Elasticsearch is beyond the scope of this guide but you can find more information in the Elasticsearch clustering documentation.)
Each host has its own web server; the web servers do not have to be the same.
For example, the Magento application can run Apache and Elasticsearch can run nginx.
Both web servers use Transport Layer Security (TLS).
Setting up TLS is beyond the scope of our documentation.
Search requests are processed as follows:
A search request from a user is received by the Magento web server, which forwards it to the Elasticsearch server.
You configure the Elasticsearch to connect to the proxy’s host and port. We recommend the web server’s SSL port (by default, 443).
The Elasticsearch web server (listening on port 443) proxies the request to the Elasticsearch server (by default, it listens on port 9200).
Access to Elasticsearch is further protected by HTTP Basic authentication. For any request to reach Elasticsearch, it must travel over SSL and provide a valid username and password.
Elasticsearch processes the search request.
Communication returns along the same route, with the Elasticsearch web server acting as a secure reverse proxy.
Prerequisites and Elasticsearch
The tasks discussed in this section require the following:
- Firewall and SELinux
- Install the Java Software Development Kit (JDK)
- Install Elasticsearch
- Upgrading Elasticsearch
Firewall and SELinux
Please take into account that security-related software (iptables, SELinux, AppArmor etc.) may be configured by default to block communication between subsystems. It may be a good idea to check them in case of problems.
Set up rules for iptables and SELinux
To set up rules to allow communication with the firewall or SELinux enabled, consult the following resources:
- iptables how-to
- How to edit iptables rules (fedora project)
- Introduction to SELinux (CentOS.org)
- SELinux How-To Wiki (CentOS.org)
Install the Java Software Development Kit (JDK)
To determine if Java is already installed, enter the following command:
1 java -version
If the message
java: command not found displays, you must install the Java SDK as discussed in the next section.
See one of the following sections:
Install the JDK on CentOS
Be sure to install the JDK and not the JRE.
1 yum -y install java-1.8.0-openjdk
Java version 8 might not be available for all operating systems. For example, you can search the list of available packages for Ubuntu.
Install the JDK on Ubuntu
To install JDK 1.8 on Ubuntu, enter the following commands as a user with
1 apt-get -y update
1 apt-get install -y openjdk-8-jdk
For other options, see Oracle documentation.
Follow Installing Elasticsearch for your platform-specific steps.
To verify that Elasticsearch is working, enter the following command on the server on which it is running:
1 curl -XGET '<host>:9200/_cat/health?v&pretty'
A message similar to the following is displayed:
1 2 epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks 1519701563 03:19:23 elasticsearch green 1 1 0 0 0 0 0 0
Refer to Upgrading Elasticsearch for full instructions on backing up your data, detecting potential migration issues, and testing upgrades before deploying to production. Depending on your current version of Elasticsearch, a full cluster restart may or may not be required.
Elasticsearch requires JDK 1.8 or higher. See Install the Java Software Development Kit (JDK) to check which version of JDK is installed.
For additional information, see Elasticsearch documentation