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This document describes the upgrade process between two versions of Scylla Manager.
This guide covers the general steps for upgrading Scylla Manager between any two versions on the following platforms:
Red Hat Enterprise Linux, versions 7 and 8
Debian, versions 10 and 11
Ubuntu, versions 18.04, 20.04, 22.04
Upgrade procedure for the Scylla Manager includes upgrade of three components server, client, and the agent. Entire cluster shutdown is NOT needed. Scylla will be running while the manager components are upgraded. Overview of the required steps:
Stop all Scylla Manager tasks (or wait for them to finish)
Stop the Scylla Manager Server
Stop the Scylla Manager Agent on all nodes
Upgrade the Scylla Manager Server and Client
Upgrade the Scylla Manager Agent on all nodes
Run scyllamgr_agent_setup script on all nodes
Reconcile configuration files
Start the upgraded Scylla Manager Agent on all nodes
Start the upgraded Scylla Manager Server
Validate status of the cluster
On the Manager Server check current status of the manager tasks:
sctool task list -c <cluster>
Or on versions 3.0 and higher using:
sctool tasks -c <cluster>
None of the listed tasks should have status in RUNNING.
On the Manager Server instruct Systemd to stop the server process:
sudo systemctl stop scylla-manager
Ensure that it is stopped with:
sudo systemctl status scylla-manager
It should have a status of “Active: inactive (dead)”.
On each scylla node in the cluster run:
sudo systemctl stop scylla-manager-agent
Ensure that it is stopped with:
sudo systemctl status scylla-manager-agent
It should have a status of “Active: inactive (dead)”.
On the Manager server, update the Manager repo file. Go to ScyllaDB Manager in the ScyllaDB Download Center, and select your platform and the version to which you want to upgrade to display the relevant command.
The following examples show how to update the repo for Manager 3.1:
sudo curl -o /etc/yum.repos.d/scylla-manager.repo -L http://downloads.scylladb.com/rpm/centos/scylladb-manager-3.1.repo
sudo wget -O /etc/apt/sources.list.d/scylla-manager.list http://downloads.scylladb.com/deb/ubuntu/scylladb-manager-3.1.list
Note
You don’t need to update the repo file if you upgrade to a patch release, for example, from Manager 3.1.1 to 3.1.2.
You can display the contents of the Manager repo file to confirm that the displayed version is the version to which you want to upgrade.
On CentOS/Red Hat, run:
cat /etc/yum.repos.d/scylla-manager.repoOn Debian/Ubuntu, run:
cat /etc/apt/sources.list.d/scylla-manager.list
On the Manager server, instruct the package manager to update the server and the client:
sudo yum update scylla-manager-server scylla-manager-client -y
sudo apt-get update
sudo apt-get install scylla-manager-server scylla-manager-client -y
Note
When using apt-get, if a previous version of the Scylla Manager package had a modified configuration file, you will be asked what to do with this file during the installation process. In order to keep both files for reconciliation (covered later in the procedure), select the “keep your currently-installed version” option when prompted.
On each scylla node instruct package manager to update the agent:
CentOS, Red Hat:
sudo yum update scylla-manager-agent -y
Debian, Ubuntu:
sudo apt-get update
sudo apt-get install scylla-manager-agent -y
Note
With apt-get, if a previous version of the package had a modified configuration file, you will be asked during installation what to do with it. Please select “keep your currently-installed version” option to keep both previous and new default configuration file for later reconciliation.
Note
Script mentioned in this section is added in version 2.0.2 so it won’t be available for earlier versions.
This step requires sudo rights:
$ sudo scyllamgr_agent_setup
Do you want to create scylla-helper.slice if it does not exist?
Yes - limit Scylla Manager Agent and other helper programs memory. No - skip this step.
[YES/no] YES
Do you want the Scylla Manager Agent service to automatically start when the node boots?
Yes - automatically start Scylla Manager Agent when the node boots. No - skip this step.
[YES/no] YES
First step relates to limiting resources that are available to the agent and second instructs systemd to run agent on node restart.
Upgrades can create changes to the structure and values of the default yaml configuration file. If the previous version’s configuration file was modified with custom values, this could result in a conflict. The upgrade procedure can’t resolve this without help from an administrator. If you followed instructions from the upgrade packages sections of this document, and you elected to save both the new and old configuration files, the new version of the configuration file is saved in the same directory as the old one with an added extension suffix for both server and agent. These files are stored in the /etc/scylla-manager directory.
On a CentOS configuration, a conflict looks like:
# On the Scylla Manager node
/etc/scylla-manager/scylla-manager.yaml # old file containing custom values
/etc/scylla-manager/scylla-manager.yaml.rpmnew # new default file from new version
# On all Scylla nodes
/etc/scylla-manager-agent/scylla-manager-agent.yaml # old file containing custom values
/etc/scylla-manager-agent/scylla-manager-agent.yaml.rpmnew # new default file from new version
On an Ubuntu configuration, a conflict looks like:
# On the Scylla Manager node
/etc/scylla-manager/scylla-manager.yaml # old file containing custom values
/etc/scylla-manager/scylla-manager.yaml.dpkg-dist # new default file from new version
# On all Scylla nodes
/etc/scylla-manager-agent/scylla-manager-agent.yaml # old file containing custom values
/etc/scylla-manager-agent/scylla-manager-agent.yaml.dpkg-dist # new default file from new version
It is required to manually inspect both files and reconcile old values with the new configuration. Remember to carry over any custom values like database credentials, backup, repair, and any other configuration. This can be done by manually updating values in the new config file and then renaming files:
For CentOS:
# On the Scylla Manager node
cd /etc/scylla-manager/
mv scylla-manager.yaml scylla-manager.yaml.old #renames the old config file as old
mv scylla-manager.yaml.rpmnew scylla-manager.yaml
# On all Scylla nodes
cd /etc/scylla-manager-agent/
mv scylla-manager-agent.yaml scylla-manager-agent.yaml.old
mv scylla-manager-agent.yaml.rpmnew scylla-manager-agent.yaml
For Ubuntu:
# On the Scylla Manager node
cd /etc/scylla-manager/
mv scylla-manager.yaml scylla-manager.yaml.old
mv scylla-manager.yaml.dpkg-dist scylla-manager.yaml
# On all Scylla nodes
cd /etc/scylla-manager-agent/
mv scylla-manager-agent.yaml scylla-manager-agent.yaml.old
mv scylla-manager-agent.yaml.dpkg-dist scylla-manager-agent.yaml
On each scylla node instruct Systemd to start the agent process:
sudo systemctl start scylla-manager-agent
Ensure that it is running with:
sudo systemctl status scylla-manager-agent
It should have a status of “Active: active (running)”.
On the Manager Server instruct Systemd to start the server process:
sudo systemctl daemon-reload
sudo systemctl start scylla-manager
Ensure that it is started with:
sudo systemctl status scylla-manager
It should have a status of “Active: active (running)”.
On the Manager Server check the version of the client and the server:
sctool version
Client version: 3.x.y-0.20200123.7cf18f6b
Server version: 3.x.y-0.20200123.7cf18f6b
Check that cluster is up:
sctool status -c <cluster>
All running nodes should be up.
Note
Rolling back is not recommended because updated versions contains bug fixes and performance optimizations so you will be going back to a lesser version. This should be only used as a last resort.
Rollback procedure contains the same steps as upgrade but with downgrading the components to older version:
Stop all Scylla Manager tasks (or wait for them to finish)
Stop the Scylla Manager Server
Stop the Scylla Manager Agent on all nodes
Downgrade the Scylla Manager Server and Client
Downgrade the Scylla Manager Agent on all nodes
Bring back old configuration (if there was conflict)
Start the Scylla Manager Agent on all nodes
Start the Scylla Manager Server
Validate status of the cluster
On the Manager Server check current status of the manager tasks:
sctool tasks -c <cluster>
None of the listed tasks should have status in RUNNING.
On the Manager Server instruct Systemd to stop the server process:
sudo systemctl stop scylla-manager
Ensure that it is stopped with:
sudo systemctl status scylla-manager
It should have a status of “Active: inactive (dead)”.
On each scylla node in the cluster run:
sudo systemctl stop scylla-manager-agent
Ensure that it is stopped with:
sudo systemctl status scylla-manager-agent
It should have a status of “Active: inactive (dead)”.
On the Manager Server instruct package manager to downgrade server and the client:
CentOS, Red Hat:
sudo yum downgrade scylla-manager-server-2.x* scylla-manager-client-2.x* -y
Debian, Ubuntu:
sudo apt-get install scylla-manager-server=2.x scylla-manager-client=2.x -y
On each scylla node instruct package manager to downgrade the agent:
CentOS, Red Hat:
sudo yum downgrade scylla-manager-agent-2.x* -y
Debian, Ubuntu:
sudo apt-get install scylla-manager-agent=2.x -y
If you followed instructions from the Upgrade Steps section and you had configuration conflict when upgrading, then listing the configuration directory should give you both new and old configuration:
/etc/scylla-manager/scylla-manager.yaml # New version that you want to disable
/etc/scylla-manager/scylla-manager.yaml.old # Previous version that you want to rollback
To restore the old configuration:
cd /etc/scylla-manager/
mv scylla-manager.yaml scylla-manager.yaml.new
mv scylla-manager.yaml.old scylla-manager.yaml
The procedure is the same for the Scylla Manager Agent (on all nodes):
cd /etc/scylla-manager-agent/
mv scylla-manager-agent.yaml scylla-manager-agent.yaml.new
mv scylla-manager-agent.yaml.old scylla-manager-agent.yaml
On all nodes instruct Systemd to start the agent process:
sudo systemctl start scylla-manager-agent
Ensure that it is running with:
sudo systemctl status scylla-manager-agent
It should have a status of “Active: active (running)”.
On the Manager Server instruct Systemd to start the server process:
sudo systemctl stop scylla-manager
Ensure that it is stopped with:
sudo systemctl status scylla-manager
It should have a status of “Active: active (running)”.
On the Manager Server check the version of the client and the server:
sctool version
Client version: 2.x
Server version: 2.x
Check that cluster is up:
sctool status -c <cluster>
All running nodes should be up.
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