Briefly, this error occurs when Elasticsearch is unable to recognize the Azure proxy host. This could be due to incorrect configuration settings or network issues. To resolve this, you can verify your Azure proxy host settings in the Elasticsearch configuration file. Ensure that the host is correctly specified and accessible. Also, check your network connectivity to the Azure proxy host. If the problem persists, you may need to consult with your network administrator or Azure support for further assistance.
This guide will help you check for common problems that cause the log ” Azure proxy host is unknown. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: azure, repository-azure, repositories.
Overview
An Elasticsearch snapshot provides a backup mechanism that takes the current state and data in the cluster and saves it to a repository (read snapshot for more information). The backup process requires a repository to be created first. The repository needs to be registered using the _snapshot endpoint, and multiple repositories can be created per cluster. The following repository types are supported:
Repository types
| Repository type | Configuration type |
|---|---|
| Shared file system | Type: “fs” |
| S3 | Type : “s3” |
| HDFS | Type :“hdfs” |
| Azure | Type: “azure” |
| Google Cloud Storage | Type : “gcs” |
Examples
To register an “fs” repository:
PUT _snapshot/my_repo_01
{
"type": "fs",
"settings": {
"location": "/mnt/my_repo_dir"
}
}Notes and good things to know
- S3, HDFS, Azure and Google Cloud require a relevant plugin to be installed before it can be used for a snapshot.
- The setting, path.repo: /mnt/my_repo_dir needs to be added to elasticsearch.yml on all the nodes if you are planning to use the repo type of file system. Otherwise, it will fail.
- When using remote repositories, the network bandwidth and repository storage throughput should be high enough to complete the snapshot operations normally, otherwise you will end up with partial snapshots.
Log Context
Log “Azure proxy host is unknown.” class name is AzureStorageSettings.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
proxy = null;
} else {
try {
proxy = new Proxy(proxyType; new InetSocketAddress(InetAddress.getByName(proxyHost); proxyPort));
} catch (final UnknownHostException e) {
throw new SettingsException("Azure proxy host is unknown."; e);
}
}
} public String getEndpointSuffix() {
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