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Upgrade Guide - Ubuntu 14.04 to 16.04¶

Ubuntu 14.04 will be end of life in April 2019, this document is a step by step procedure for Scylla users to upgrade Ubuntu 14.04 to 16.04.

Applicable versions¶

OS: Ubuntu 14.04
Scylla: 2018.1

Upgrade Procedure¶

Note

Execute the following commands one node at the time, moving to the next node only after the upgrade procedure completed successfully.

Warning

If you are using CDC and upgrading Scylla 4.3 to 4.4, please review the API updates in querying CDC streams and CDC stream generations. In particular, you should update applications that use CDC according to CDC Upgrade notes before upgrading the cluster to 4.4.

If you are using CDC and upgrading from pre 4.3 version to 4.3, note the upgrading from experimental CDC.

The 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:

Check cluster schema
Drain node and backup the data
Backup configuration file
Stop Scylla
Upgrade OS to latest 14.04
Clean scylla-gcc73 packages to avoid conflict
Upgrade OS to 16.04
Upgrade 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 to:

Not to use new 2018.1 features
Not to run administration functions, like repairs, refresh, rebuild or add or remove nodes
Not to apply schema changes

Upgrade steps¶

Check cluster schema¶

Make sure that all nodes have the schema synched prior to upgrade, we won’t survive an upgrade that has schema disagreement between nodes.

nodetool describecluster

Drain node and 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 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.

Backup configuration file¶

for conf in $(cat /var/lib/dpkg/info/scylla-*server.conffiles /var/lib/dpkg/info/scylla-*conf.conffiles /var/lib/dpkg/info/scylla-*jmx.conffiles | grep -v init ); do sudo cp -v $conf $conf.backup-2.3; done

Gracefully stop the node¶

sudo service scylla-server stop

Upgrade OS to latest 14.04¶

sudo apt-get clean all
sudo apt-get update
sudo apt-get upgrade

Clean scylla-gcc73 packages to avoid conflict¶

sudo apt-get remove scylla-gcc73-libstdc++6

Upgrade OS to 16.04¶

This step will take some time and will require manual interaction.

sudo apt-get update
sudo do-release-upgrade
sudo reboot

Upgrade Scylla packages¶

Update Scylla repo to repo for Ubuntu 16.04, Scylla RPM repo <https://www.scylladb.com/enterprise-download/ubuntu-16-04/>

sudo apt-get dist-upgrade scylla-enterprise

Start the node¶

sudo systemctl start scylla-server

Validate¶

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.
Check scylla-server log (execute journalctl _COMM=scylla for Ubuntu 16.04) and /var/log/syslog to validate there are no errors.
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.

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