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This document is a step by step procedure for upgrading from Scylla Enterprise 2021.x.y to 2021.x.z.
This guide covers upgrading Scylla Enterprise from the following versions: 2021.x.y to 2021.x.z, on the following platforms:
Red Hat Enterprise Linux, version 7 and later
CentOS, version 7 and later
No longer provide packages for Fedora
A Scylla upgrade is a rolling procedure which does not require full cluster shutdown. For each of the nodes in the cluster, serially (i.e. one at a time), you will:
Drain node and backup the data
Check your current release
Backup configuration file
Stop Scylla
Download and install new Scylla packages
Start Scylla
Validate that the upgrade was successful
Apply the following procedure serially on each node. Do not move to the next node before validating the node is up and running with the new version.
During the rolling upgrade it is highly recommended:
Not to use new 2021.x.z features
Not to run administration functions, like repairs, refresh, rebuild or add or remove nodes
Not to apply schema changes
Before any major procedure, like an upgrade, it is recommended to backup all the data to an external device. In Scylla, backup is done using the nodetool snapshot command. For each node in the cluster, run the following command:
nodetool drain
nodetool snapshot
Take note of the directory name that nodetool gives you, and copy all the directories having this name under /var/lib/scylla to a backup device.
When the upgrade is complete (all nodes), the snapshot should be removed by nodetool clearsnapshot -t <snapshot>, or you risk running out of space.
sudo cp -a /etc/scylla/scylla.yaml /etc/scylla/scylla.yaml.backup-2021.x.z
sudo systemctl stop scylla-server
Before upgrading, check what version you are running now using rpm -qa | grep scylla-server. You should use the same version in case you want to rollback the upgrade. If you are not running a 2021.x.y version, stop right here! This guide only covers 2021.x.y to 2021.x.z upgrades.
To upgrade:
Update the Scylla Enterprise RPM repo to 2021.x
install
sudo yum clean all
sudo yum update scylla\* -y
sudo systemctl start scylla-server
Check cluster status with nodetool status and make sure all nodes, including the one you just upgraded, are in UN status.
Use curl -X GET "http://localhost:10000/storage_service/scylla_release_version" to check scylla version.
Use journalctl _COMM=scylla to check there are no new errors in the log.
Check again after 2 minutes, to validate no new issues are introduced.
Once you are sure the node upgrade is successful, move to the next node in the cluster.
Note
Execute the following commands one node at the time, moving to the next node only after the rollback procedure completed successfully.
The following procedure describes a rollback from Scylla Enterprise release 2021.x.z to 2021.x.y. Apply this procedure if an upgrade from 2021.x.y to 2021.x.z failed before completing on all nodes. Use this procedure only for nodes you upgraded to 2021.x.z
Scylla rollback is a rolling procedure which does not require full cluster shutdown. For each of the nodes rollback to 2021.x.y, you will:
Drain the node and stop Scylla
Downgrade to previous release
Restore the configuration file
Restart Scylla
Validate the rollback success
Apply the following procedure serially on each node. Do not move to the next node before validating the node is up and running with the new version.
nodetool drain
sudo systemctl stop scylla-server
Install
sudo yum downgrade scylla\*-2021.x.y-\* -y
sudo rm -rf /etc/scylla/scylla.yaml
sudo cp -a /etc/scylla/scylla.yaml.backup-2021.x.z /etc/scylla/scylla.yaml
sudo systemctl start scylla-server
Check upgrade instruction above for validation. Once you are sure the node rollback is successful, move to the next node in the cluster.