Azure Repositoryedit

To enable Azure repositories, you have first to define your azure storage settings as secured settings:

bin/elasticsearch-keystore add azure.client.default.account
bin/elasticsearch-keystore add azure.client.default.key

Where account is the azure account name and key the azure secret key.

Note that you can also define more than one account:

bin/elasticsearch-keystore add azure.client.default.account
bin/elasticsearch-keystore add azure.client.default.key
bin/elasticsearch-keystore add azure.client.secondary.account
bin/elasticsearch-keystore add azure.client.secondary.key

default is the default account name which will be used by a repository unless you set an explicit one.

You can set the client side timeout to use when making any single request. It can be defined globally, per account or both. It’s not set by default which means that Elasticsearch is using the default value set by the azure client (known as 5 minutes).

max_retries can help to control the exponential backoff policy. It will fix the number of retries in case of failures before considering the snapshot is failing. Defaults to 3 retries. The initial backoff period is defined by Azure SDK as 30s. Which means 30s of wait time before retrying after a first timeout or failure. The maximum backoff period is defined by Azure SDK as 90s.

endpoint_suffix can be used to specify Azure endpoint suffix explicitly. Defaults to core.windows.net.

cloud.azure.storage.timeout: 10s
azure.client.default.max_retries: 7
azure.client.default.endpoint_suffix: core.chinacloudapi.cn
azure.client.secondary.timeout: 30s

In this example, timeout will be 10s per try for default with 7 retries before failing and endpoint suffix will be core.chinacloudapi.cn and 30s per try for secondary with 3 retries.

Important

Supported Azure Storage Account types

The Azure Repository plugin works with all Standard storage accounts

  • Standard Locally Redundant Storage - Standard_LRS
  • Standard Zone-Redundant Storage - Standard_ZRS
  • Standard Geo-Redundant Storage - Standard_GRS
  • Standard Read Access Geo-Redundant Storage - Standard_RAGRS

Premium Locally Redundant Storage (Premium_LRS) is not supported as it is only usable as VM disk storage, not as general storage.

You can register a proxy per client using the following settings:

azure.client.default.proxy.host: proxy.host
azure.client.default.proxy.port: 8888
azure.client.default.proxy.type: http

Supported values for proxy.type are direct (default), http or socks. When proxy.type is set to http or socks, proxy.host and proxy.port must be provided.

Repository settingsedit

The Azure repository supports following settings:

client
Azure named client to use. Defaults to default.
container
Container name. You must create the azure container before creating the repository. Defaults to elasticsearch-snapshots.
base_path
Specifies the path within container to repository data. Defaults to empty (root directory).
chunk_size
Big files can be broken down into chunks during snapshotting if needed. The chunk size can be specified in bytes or by using size value notation, i.e. 1g, 10m, 5k. Defaults to 64m (64m max)
compress
When set to true metadata files are stored in compressed format. This setting doesn’t affect index files that are already compressed by default. Defaults to false.
readonly
Makes repository read-only. Defaults to false.
location_mode
primary_only or secondary_only. Defaults to primary_only. Note that if you set it to secondary_only, it will force readonly to true.

Some examples, using scripts:

# The simpliest one
PUT _snapshot/my_backup1
{
    "type": "azure"
}

# With some settings
PUT _snapshot/my_backup2
{
    "type": "azure",
    "settings": {
        "container": "backup-container",
        "base_path": "backups",
        "chunk_size": "32m",
        "compress": true
    }
}


# With two accounts defined in elasticsearch.yml (my_account1 and my_account2)
PUT _snapshot/my_backup3
{
    "type": "azure",
    "settings": {
        "client": "secondary"
    }
}
PUT _snapshot/my_backup4
{
    "type": "azure",
    "settings": {
        "client": "secondary",
        "location_mode": "primary_only"
    }
}

Example using Java:

client.admin().cluster().preparePutRepository("my_backup_java1")
    .setType("azure").setSettings(Settings.builder()
        .put(Storage.CONTAINER, "backup-container")
        .put(Storage.CHUNK_SIZE, new ByteSizeValue(32, ByteSizeUnit.MB))
    ).get();

Repository validation rulesedit

According to the containers naming guide, a container name must be a valid DNS name, conforming to the following naming rules:

  • Container names must start with a letter or number, and can contain only letters, numbers, and the dash (-) character.
  • Every dash (-) character must be immediately preceded and followed by a letter or number; consecutive dashes are not permitted in container names.
  • All letters in a container name must be lowercase.
  • Container names must be from 3 through 63 characters long.