fix: PXC tutorial installs PXC 8.4 to match the 8.4 base AMI - #71
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migrate_async_to_pxc.yml enabled the pxc-80 repo and installed PXC 8.0, but the base AMI is now Percona Server 8.4. PXC 8.0's mysqld refuses to start on an 8.4 datadir: [ERROR] [MY-014061] [InnoDB] Invalid MySQL server downgrade: Cannot downgrade from 80407 to 80045. So `systemctl start mysql@bootstrap` crashed on mysql1 and the cluster never formed (mysql2/mysql3 never reached SST). This is the current cause of #20 -- the original keyring cause (early-plugin-load) is already gone; the AMI uses the component keyring, which initializes fine. Switch the repo to pxc-84-lts so PXC matches the PS 8.4 datadir. Verified end-to-end (us-west-2): with pxc-84-lts the playbook completes, PXC 8.4.8 installs, mysql1 bootstraps, mysql2/mysql3 complete SST, and the cluster reports wsrep_cluster_size=3 / status=Primary / state=Synced. Closes #20 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Closes #20
Root cause (validated live)
migrate_async_to_pxc.ymlenabledpxc-80and installed PXC 8.0.45, but the base AMI is now Percona Server 8.4.7. PXC 8.0's mysqld refuses to start on an 8.4 datadir:So
systemctl start mysql@bootstrapcrashed on mysql1 and the cluster never formed — mysql2/mysql3 never even reached SST. This is the current cause of #20. The issue's original cause (theearly-plugin-load = keyring_file.sokeyring) is already gone — the AMI uses the component keyring, which initializes fine (Keyring component initialized successfully).Fix
One line:
percona-release enable pxc-80→pxc-84-lts, so PXC matches the PS 8.4 datadir.Verified end-to-end (us-west-2, full lab path)
make setup class=pxc→ansible-playbook migrate_async_to_pxc.yml:pxc-80)pxc-84-lts)failed=0percona-xtradb-cluster-server-8.4.8installedwsrep_cluster_size=3,status=Primary,state=SyncedTeardown verified clean afterward.