Upgrading Zend Server on RPM (RHEL and CentOS)

The procedures on this page describe the upgrade procedures for a single Zend Server and a Zend Server cluster on an RPM (RHEL and CentOS) operating system.
Please read the following restrictions carefully before proceeding.

Upgrade Restrictions

Upgrading Zend Server can only be performed when upgrading from Zend Server 2019.0 and newer to Zend Server 2021.3.x, or when upgrading between Zend Server 2021.3.x versions.

Direct upgrades from Zend Server 9.1 or older can only be performed using a clean installation of Zend Server 2021.3. If a clean installation is not possible, you will need to complete a two-step upgrade procedure. For more information, please contact the Zend Support.

For a list of limitations and known upgrade issues, see the Zend Server Release Notes.

Using the Zend Repository Installer

The upgrade procedures use the Linux Zend Repository Installer program which includes a simple shell script that automates the process of upgrading Zend Server through Zend's repository.

The script upgrades your Zend Server and PHP versions, according to your current configurations and target version passed. The script will notify you when an upgrade cannot be performed. This occurs in the following scenarios:

  • When attempting to upgrade from Zend Server 9.1 and below
  • When attempting to downgrade a PHP version
  • When attempting to upgrade a Web server (e.g., from Apache to nginx)

Zend Server Versions/PHP Versions Support

This table specifies the PHP versions supported by the latest versions of Zend Server.

Zend Server 8.5 Zend Server 9.1 Zend Server 2019.0 Zend Server 2021.0
PHP 5.6 — — —
  PHP 7.1 PHP 7.1 PHP 7.1
    PHP 7.2 PHP 7.2
    PHP 7.3 PHP 7.3
      PHP 7.4

This section describes the procedure for upgrading a single Zend Server.

Example Scenarios:

  • Upgrading from Zend Server 2019.0.x to 2021.3.x
  • Upgrading between 2021.3.x versions

Note:

Zend Server 2021.3 installs 4 versions of PHP, all available with a simple PHP switch after installation.
If you are upgrading from a previous Zend Server installation, with PHP 7.1, 7.2, or 7.3 already installed on Zend Server (check by running /usr/local/zend/bin/php -v), the installer enables and uses the PHP version which is already installed. Use PHP switch to enable PHP 7.4 if you would prefer to use that version.

Important!

When changing a major PHP version, some PHP and Zend Server configuration settings may be lost. For post-upgrade reference, we recommend making a backup of the etc folder located in the Zend Server installation files (/usr/local/zend/etc-x.x.x).

Instructions on how to complete a procedure

To upgrade a single Zend Server:

  1. Remove the server from the Load Balancer.
  2. Visit Zend's download page (https://www.zend.com/downloads/zend-server) and select the appropriate OS family, platform, and version to download Zend Server. You will be prompted to enter some information to continue with the download.

  3. Locate and extract the package:
    ZendServer-X.X.X-RepositoryInstaller-linux.tar.gz

  4. To change to the directory with the installer scripts run:
    cd ZendServer-RepositoryInstaller-linux/

  5. Run the following command:
    ./install_zs.sh
  1. Return the server to the Load Balancer.

 

This procedure explains how to upgrade a Zend Server cluster using the Zend Repository Installer program.

Example scenarios:

  • Upgrading a Zend Server cluster to a cluster with the same major PHP version (Example: Zend Server 2019.0.x with PHP 7.2 to Zend Server 2021.3.x with PHP 7.2).

  • Upgrading a Zend Server cluster to a cluster with a different major PHP version (Example: Zend Server 2019.0 with PHP 7.1 to Zend Server 2021.3.x with PHP 7.3).

Note:

Zend Server 2021.3 installs 4 versions of PHP, all available with a simple PHP switch after installation.
If you are upgrading from a previous Zend Server installation, with PHP 7.1, 7.2, or 7.3 already installed on Zend Server (check by running /usr/local/zend/bin/php -v), the installer enables and uses the PHP version which is already installed. Use PHP switch to enable PHP 7.4 if you would prefer to use that version.

Important!

When changing a major PHP version, some PHP and Zend Server configuration settings may be lost. For post-upgrade reference, we recommend making a backup of the etc folder located in the Zend Server installation files (/usr/local/zend/etc-x.x.x).

Important!

This procedure does not require disabling the servers in the cluster before upgrading. Servers which are disabled during the upgrade process may fail to run properly when re-enabled.

Instructions on how to complete a procedure

To upgrade a Zend Server cluster, perform the following procedure for each server in the cluster:

  1. Remove the server from the Load Balancer. This should be done following the recommended procedure depending on your load balancing configuration.
  2. Upgrade the server using the instructions for upgrading a single Zend Server.
  1. Return the server to the Load Balancer.

During the upgrade process, Zend Server backs up the 'etc' folder containing your server and PHP configurations, and the 'db' folder containing your database information. In case something goes wrong during the upgrade process, and you cannot access Zend Server, follow the steps below to restore your older version of Zend Server.

Instructions on how to complete a procedure

To restore Zend Server:

  1. Back up the etc-x.x.x and db-x.x.x folders located in your Zend Server installation directory:

/usr/local/zend/etc-x.x.x and /usr/local/zend/db-x.x.x

  1. Uninstall the new version of Zend Server.
  2. Re-install the old version of Zend Server.
  3. Copy the etc and db folders into your Zend Server installation files.

If this fails, please contact Zend Support.