Common issues

This set of common symptoms and resolutions can help you to diagnose unexpected behavior with Elastic Cloud Enterprise. You can also refer to the list of product Limitations and known problems.

Symptom: You have no access to API and UI because all coordinators are lost. More than half of the director hosts are available. If you have 5 directors, 3 directors must be available. If you lost more than half of the directors, contact the support. If all directors are lost, re-install ECE.

Resolution: Use the emergency token provided during the installation of the genesis ECE nodes. You must explicitly specify the roles with the parameter --roles, for example "coordinator,director,proxy". Otherwise, the host does not run any role.

Symptom: On CentOS and RHEL the installation of Elastic Cloud Enterprise fails, possibly indicating an issue that affects communication between Docker containers on the host.

Resolution: The issue might be caused by the firewalld service. The service is not compatible with Docker and interferes with the installation of ECE. You must disable firewalld with sudo systemctl disable firewalld and reboot before installing or reinstalling ECE.

To learn more, check the the configuration steps for Red Hat Enterprise Linux (RHEL) and CentOS.

Allocator failures result in alerts in the Cloud UI. You cannot repair an allocator in the Cloud UI, so you should first move all nodes to a new allocator. Vacate options for a selected allocator can help fine tune the removal of nodes. After the allocator is vacated, you should investigate the cause of the failure separately, which could be due to a host machine failure, and replace any lost capacity.

Symptoms: You installed Elastic Cloud Enterprise on a new host and assigned it the allocator role from the command line with the --roles "allocator" parameter during installation, but new clusters are not being created on the allocator.

Resolution: The issue is caused by a token specified with the --roles-token 'TOKEN' parameter that does not have sufficient privileges to assign the role correctly. To resolve this issue, you might need to refresh the roles for the allocator.

To avoid this issue on future allocators you create, generate a roles token that has the right permissions for this to work, in this case the permission to assign the allocator role; the token generated during the installation on the first host will not suffice.

Symptoms: When you attempt to log into the Cloud UI, the login process appears to hang and then fails.

Resolution: The administration console that supports the Cloud UI might be running out of Java heap space, causing login failures. This issue is expected to be fixed in a future release. As a workaround, you can manually increase the heap size.

In the current release, there is no direct way to change the Java heap size in the UI, so you need to increase the heap size as follows:

Symptoms: When you attempt to log into the Cloud UI or when you attempt to connect to an Elasticsearch or Kibana endpoint URL, the connection eventually times out with an error. The error indicates that the host cannot be reached.

Resolution: On AWS, the default URLs provided might point to a private host IP address, which is not accessible externally. To resolve this issue, use a URL for the Cloud UI that is externally accessible and update your cluster endpoint to use a public IP address for Elasticsearch and Kibana.

This issue applies only to hosts running on AWS, where both public and private IP addresses are provided.

To check if you are affected and to resolve this issue:

Symptoms: When upgrading Elastic Cloud Enterprise, the upgrade process indicates that a container upgrade has failed, followed by a rollback of all container upgrades and an error message that the upgrade process has failed. The information you get is similar to this output:

...
- Runner [192.168.44.10]: container [proxies-proxy] status changed: [upgrade failed] at [2017-08-23T20:27:02.114Z]
- Runner [192.168.44.10]: container [proxies-proxy] status changed: [rollback started] at [2017-08-23T20:27:07.134Z]
...
- The upgrade of the {n} installation has failed, but we successfully rolled back changes.
- Check that all services are running and that they are at the same version level with the docker ps command. Try the upgrade again.
- The log files on each host might provide additional information about the cause of the failures. (path: HOST_STORAGE_PATH/logs/upgrader-logs).
- You can find a backup of ZooKeeper's transaction log that was created before the upgrade in [/mnt/data/elastic/192.168.44.10/services/zookeeper/data/backup/20170823-202249/version-2].
- Exiting upgrader
- Removing upgrade container

Resolution: The Elastic Cloud Enterprise upgrade process is designed to be safe. If there is an issue with any part of the upgrade, the entire process is rolled back. In most cases, the rollback is automatic and the upgrade process can be reattempted after you fix the issue that caused the rollback.

The upgrade process can fail for several reasons, including:

To determine the root cause of an upgrade failure, the following logs are available where HOST_STORAGE_PATH and RUNNER_ID are specific to your installation:

In rare cases, a manual rollback of the upgrade might be required. Check Getting help.