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Upgrade Guide - Scylla 1.0 to 1.1 for Red Hat Enterprise or CentOS¶
This document is a step by step procedure for upgrading from Scylla 1.0 to Scylla 1.1, and rollback to 1.0 if required.
Applicable versions¶
This guide covers upgrading Scylla from the following versions: 1.0.x to Scylla version 1.1.y, on the following platforms:
Fedora 22
Red Hat Enterprise Linux, version 7 and later
CentOS, version 7 and later
Upgrade Procedure¶
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:
backup the data
check your current release
backup configuration file
download and install new Scylla packages
gracefully restart 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 1.1 features
Not to run administration functions, like repairs, refresh, rebuild or add or remove nodes
Not to apply schema changes
Backup the data¶
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 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.
Upgrade steps¶
Backup configuration file¶
sudo cp -a /etc/scylla/scylla.yaml /etc/scylla/scylla.yaml.backup-1.0
sudo rm -rf /etc/yum.repos.d/scylla.repo
Download and install the new release¶
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 1.0.x version, stop right here! This
guide only covers 1.0.x to 1.1.y upgrades.
To upgrade:
Update the Scylla RPM repo to 1.1
install
sudo yum clean all
sudo yum update scylla-server scylla-jmx scylla-tools -y
Gracefully restart the node¶
nodetool drain
sudo systemctl restart scylla-server.service
Validate¶
Check cluster status with
nodetool statusand make sure all nodes, including the one you just upgraded, are in UN status.Use
journalctl _COMM=scyllato 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.
Rollback Procedure¶
The following procedure describes a rollback from Scylla release 1.1.x to 1.0.y. Apply this procedure if an upgrade from 1.0 to 1.1 failed before completing on all nodes. Use this procedure only for nodes you upgraded to 1.1
Scylla rollback is a rolling procedure which does not require full cluster shutdown. For each of the nodes rollback to 1.0, you will:
retrieve the old Scylla packages
drain the node
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.
Rollback steps¶
Download and install the new release¶
Remove the old repo file.
sudo rm -rf /etc/yum.repos.d/scylla.repo
Update the Scylla RPM repo to 1.0
Install
sudo yum clean all
sudo yum downgrade scylla-server scylla-jmx scylla-tools -y
Gracefully shutdown Scylla¶
nodetool drain
sudo service scylla-server stop
Restore the configuration file¶
sudo rm -rf /etc/scylla/scylla.yaml
sudo cp -a /etc/scylla/scylla.yaml.backup-1.0 /etc/scylla/scylla.yaml
Start the node¶
sudo systemctl start scylla-server.service
Validate¶
Check upgrade instruction above for validation. Once you are sure the node rollback is successful, move to the next node in the cluster.