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Code Block
languagebash
/usr/share/caringo-elasticsearch-search/bin/configure_elasticsearch_with_swarm_search.py
Info

Important

The upgrade requires Internet access to download the Elasticsearch rpm. Place elasticsearch-7.17.*.rpm in the current directory if Internet access is unavailable.

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Info

Troubleshooting

Change permissions if the Elasticsearch service fails and journalctl -u elasticsearch shows access is denied (BootstrapException/AccessDeniedException): 

chown elasticsearch /etc/elasticsearch

Info

Important

Type Ctrl-C once when the upgrade script is stuck in retrying status checks and proceed to the next node after the script finishes if the cluster loses master during the upgrade process and does not recover. Review /etc/elasticsearch/elasticsearch.yml and tail -F /var/log/elasticsearch/<cluster-name>.log for configuration errors.

The nodes elect the master and recover once all nodes have started on Elasticsearch 7.5.2. Health status goes yellow, then eventually green. Re-enable shard allocation, otherwise /_cat/health?v stops at 50% with health status yellow.

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  1. It fixes /etc/sysconfig/elasticsearch to the correct ES6 version (the same as ES7).

  2. It increases the systemd timeout in /etc/systemd/system/elasticsearch.service.d/override.conf (see github.com/elastic/elasticsearch/issues/60140)

  3. A prompt to continue with the yum upgrade to 7.5.2 appears after refreshing the config files for Elasticsearch 6.

  4. It disables shard allocation and does a POST synced-flush for safer rolling upgrades. 

Info

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Important

Disabling shard allocation or sync-flush can fail to contact the node, but do not proceed to upgrade the next node until the cluster health is green again.

  1. It uninstalls the Prometheus Exporter plugin if it exists.

  2. It shells out to yum to install the Elasticsearch 7 RPM in the current directory or from artifacts.elastic.co, if unavailable.

  3. It updates elasticsearch.yml for version 7 compatibility, including discovery.initial_master_nodes instead of discovery.zen.unicast.hosts, and jvm.options.

  4. It starts the upgraded Elasticsearch 7 and waits for it to be ready.

  5. The cluster re-enables shard allocation and prompts to repeat these two steps on the next node if the cluster health is green or yellow.