Transferring Logs to OBS
You can transfer logs to OBS and download log files from the OBS console. You can choose scheduled or one-time transfers.
Prerequisites
- Logs have been ingested to LTS. For details, see Log Ingestion.
- You have created an OBS bucket.
- You will be billed for the storage you use in OBS. For details, see Huawei Cloud Pricing.
Creating a Scheduled Log Transfer Task
- When creating a log transfer task, you must have the following permissions in addition to the LTS permissions: setting a bucket ACL (obs:bucket:PutBucketAcl), listing buckets (obs:bucket:ListAllMyBuckets), obtaining the bucket metadata (obs:bucket:HeadBucket), and obtaining a bucket ACL (obs:bucket:GetBucketAcl), and obtaining bucket encryption configuration(obs:bucket:GetEncryptionConfiguration). For details, see Bucket Actions.
- LTS transfers only logs generated after the transfer task is configured, not historical logs.
- Log in to the LTS console.
- Choose Log Transfer in the navigation pane.
- Click Configure Log Transfer in the upper right corner.
- On the displayed page, configure the log transfer parameters.
Figure 1 Scheduled transfer
Table 1 Transfer parameters Parameter
Description
Example Value
Source Account
- Current: Logs of the current account will be transferred.
- Other: Logs of the delegator account will be transferred. Ensure that the delegator has created an agency for log transfer delegation in IAM. For details, see Creating an Agency.
Current
Agency Name
This parameter is required when Log Source Account is set to Other. Enter the name of the agency created by the delegator in IAM.
-
Delegator Account Name
This parameter is required when Log Source Account is set to Other. Enter the account name of the delegator.
-
Enable Transfer
Enabled by default.
Enabled
Transfer Destination
Select a cloud service to which logs are transferred.
OBS
Log Group Name
Select a log group.
-
Enterprise Project Name
Select an enterprise project.
- This parameter is displayed only when the enterprise project function is enabled for the current account.
- If the enterprise project function is enabled for the current account:
- All enterprise projects under the current account are displayed in the drop-down list when Log Source Account is set to Current.
- default is displayed when Log Source Account is set to Other and the enterprise project function is not enabled for the delegator account.
- All enterprise projects under the delegator account are displayed when Log Source Account is set to Other and the enterprise project function is enabled for the delegator account.
-
Log Stream Name
Select a log stream. Log streams that have been configured with OBS transfer settings cannot be selected.
To avoid transferring empty files, ensure that raw logs have been uploaded to the selected log stream.
-
OBS Bucket
- Select an OBS bucket.
- If no OBS buckets are available, click View OBS Bucket to access the OBS console and create an OBS bucket.
- If encryption has been enabled for the selected OBS bucket, select a key name and select I agree to grant permissions on Key Management Service (KMS) to LTS so LTS can create and use keys to encrypt and decrypt transferred logs.
- The selected bucket will grant the read and write permissions to LTS. Exercise caution when modifying the bucket policy to prevent log transfer failures.
- LTS supports OBS buckets of the Standard storage class and restored Archive storage class.
-
Key Name
For an encrypted OBS bucket, select a key name. If no keys are available, click Create Key and Authorize to go to the Data Encryption Workshop (DEW) console and create a key.
-
Custom Log Transfer Path
- Enabled: Logs will be transferred to a custom path to separate transferred log files of different log streams.
The format is /LogTanks/Region name/%Group name/%Stream name/Custom path. The default custom path is lts/%Y/%m/%d, where %Y indicates the year, %m indicates the month, and %d indicates the day. A custom path must meet the following requirements:
- Must start with /LogTanks/Region name.
- %Group name indicates the log group, and %Stream name indicates the log stream.
- Can contain only letters, digits, and the following special characters: &$@;:,=+?-._/ %. The character % can only be followed only by Y (year), m (month), d (day), H (hour), and M (minute). Any number of characters can be added before and after %Y, %m, %d, %H, and %M, and the sequence of these variables can be changed.
- Can contain 1–128 characters.
Example:
- If you enter LTS-test/%Y/%m/%d/%H/%M, the path is LogTanks/Region name/LTS-test/Y/m/d/H/M/Log file name.
- If you enter LTS-test/%d/%H/%m/%Y, the path is LogTanks/Region name/LTS-test/d/H/m/Y/Log file name.
- Disabled: Logs will be transferred to the default path. The default path is LogTanks/Region name/2019/01/01/Log group/Log stream/Log file name.
LTS-test/%GroupName/%StreamName/%Y/%m/%d/%H/%M
Log Prefix
Add a file name prefix to the log files transferred to an OBS bucket.
The prefix must meet the following requirements:
- Can contain up to 64 characters.
- Can contain only letters, digits, hyphens (-), underscores (_), and periods (.).
Example: If you enter LTS-log, the log file name will be LTS-log_Log file name.
LTS-log
Format
The storage format of logs. The value can be Raw log format or JSON.
- Example of the raw log format:
- Example of the JSON format:
{"host_name":"ecs-bd70","ip":"192.168.0.54","line_no":249,"message":"Sep 30 14:40:01 ecs-bd70 CRON[4363]: (root) CMD (/opt/oss/servicemgr/ICAgent/bin/manual/mstart.sh > /dev/null 2>&1)\n","path":"/var/log/syslog","time":1569825602303}
JSON
Transfer Interval
The interval for automatically transferring logs to OBS buckets. The value can be 2, 5, or 30 minutes, or 1, 3, 6, or 12 hours.
3 hours
Time Zone
When logs are transferred to OBS buckets, the time in the transfer directory and file name will use the specified UTC time zone.
(UTC) Coordinated Universal Time
Filter by Tag Fields
During transfer, logs will be filtered by tag fields collected by ICAgent.
- Disabled: Logs will not be filtered by tag fields.
- Enabled: The default tag fields include those for hosts (hostIP, hostId, hostName, pathFile, and collectTime) and for Kubernetes (clusterName, clusterId, nameSpace, podName, containerName, and appName). Optional public tag fields are regionName, logStreamName, logGroupName, and projectId.
When Filter by Tag Fields is enabled, Format must be JSON.
- Transfer Tag: After this function is enabled, log stream tags are also transferred.
Enabled
Compressed Format
Non-compression and gzip/zip/snappy compression are supported.
NOTE:This function is available only to whitelisted users. To use it, submit a service ticket.
GZIP
- Click OK. When the log transfer status changes to Normal, the transfer task has been created.
- Click the OBS bucket name in the Transfer Destination column to switch to OBS Console and view the transferred log files.
Transferred logs can be downloaded from OBS to your local PC for viewing. Logs stored in OBS are in raw or JSON format.
Figure 2 Transferring logs to OBS
Creating a One-off Log Transfer Task
This function is available only in regions CN East-Shanghai1, CN East-Shanghai2, CN North-Beijing4, CN South-Guangzhou, and AP-Singapore. To use it in other regions, submit a service ticket.
- Click Configure Log Transfer in the upper right corner.
- On the displayed page, configure the log transfer parameters.
Figure 3 One-time transfer
- Click OK. When the log transfer status changes to Normal, the transfer task has been created.
After a log transfer task is created, the parameters cannot be modified. Ensure that the parameters are correctly set.
- Click the OBS bucket name in the Transfer Destination column to switch to OBS Console and view the transferred log files.
Transferred logs can be downloaded from OBS to your local PC for viewing.
Figure 5 One-time transfer to OBS
Modifying a Log Transfer Task
Scheduled transfer tasks can be modified, but one-time transfer tasks cannot.
- Locate the row that contains the target transfer task and click Modify in the Operation column.
- Click OK.
Viewing Transfer Details
- Locate the target log transfer task and click More > Details in the same row to view its details.
- On the displayed Transfer Details page, you can view the log transfer details.
Deleting a Log Transfer Task
If logs do not need to be transferred, you can delete the transfer task.
Deleting a transfer task will stop log transfer, and the deleted task cannot be restored. Exercise caution when performing this operation.
- After a transfer task is deleted, the logs that have been transferred remain in OBS.
- When you create a transfer task, OBS will grant read and write permissions to LTS for the selected bucket. To delete a transfer task that uses an OBS bucket, perform the following operations:
- If only one transfer task uses this OBS bucket, delete the bucket access permission granted to specific users on the Permissions > Bucket ACL tab page on the OBS console when you delete the transfer task.
- If multiple transfer tasks use this OBS bucket, do not delete the bucket access permission. Otherwise, data transfer will fail.
- Locate the target transfer task and click Delete in the Operation column.
- Click OK.
Viewing Transfer Status
The status of a transfer task can be Normal, Abnormal, or Closed.
- Normal: The log transfer task works properly.
- Abnormal: An error occurred in the log transfer task. The possible causes are as follows:
- Access control on the OBS bucket is configured incorrectly. Access the OBS console to correct the settings.
- The key for the encrypted OBS bucket has been deleted or the authorization has been canceled. Ensure that the key is valid.
- Closed: The log transfer task is stopped.
Helpful Links
- If you have any questions when configuring log transfer, see Log Transfer in the FAQ.
- You can create, query, and delete log transfer tasks by calling APIs. For details, see Log Transfer.
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