213 lines
9.3 KiB
Markdown
213 lines
9.3 KiB
Markdown
---
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stage: Verify
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group: Runner
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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type: reference
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---
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# Job logs **(FREE SELF)**
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> [Renamed from job traces to job logs](https://gitlab.com/gitlab-org/gitlab/-/issues/29121) in GitLab 12.5.
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Job logs are sent by a runner while it's processing a job. You can see
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logs in job pages, pipelines, email notifications, and so on.
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## Data flow
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In general, there are two states for job logs: `log` and `archived log`.
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In the following table you can see the phases a log goes through:
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| Phase | State | Condition | Data flow | Stored path |
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| -------------- | ------------ | ----------------------- | -----------------------------------------| ----------- |
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| 1: patching | log | When a job is running | Runner => Puma => file storage | `#{ROOT_PATH}/gitlab-ci/builds/#{YYYY_mm}/#{project_id}/#{job_id}.log` |
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| 2: archiving | archived log | After a job is finished | Sidekiq moves log to artifacts folder | `#{ROOT_PATH}/gitlab-rails/shared/artifacts/#{disk_hash}/#{YYYY_mm_dd}/#{job_id}/#{job_artifact_id}/job.log` |
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| 3: uploading | archived log | After a log is archived | Sidekiq moves archived log to [object storage](#uploading-logs-to-object-storage) (if configured) | `#{bucket_name}/#{disk_hash}/#{YYYY_mm_dd}/#{job_id}/#{job_artifact_id}/job.log` |
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The `ROOT_PATH` varies per environment. For Omnibus GitLab it
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would be `/var/opt/gitlab`, and for installations from source
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it would be `/home/git/gitlab`.
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## Changing the job logs local location
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To change the location where the job logs are stored, follow the steps below.
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**In Omnibus installations:**
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1. Edit `/etc/gitlab/gitlab.rb` and add or amend the following line:
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```ruby
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gitlab_ci['builds_directory'] = '/mnt/to/gitlab-ci/builds'
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```
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1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
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changes to take effect.
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Alternatively, if you have existing job logs you can follow
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these steps to move the logs to a new location without losing any data.
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1. Pause continuous integration data processing by updating this setting in `/etc/gitlab/gitlab.rb`.
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Jobs in progress are not affected, based on how [data flow](#data-flow) works.
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```ruby
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sidekiq['queue_selector'] = true
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sidekiq['queue_groups'] = [
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"feature_category!=continuous_integration"
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]
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```
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1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
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changes to take effect.
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1. Set the new storage location in `/etc/gitlab/gitlab.rb`:
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```ruby
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gitlab_ci['builds_directory'] = '/mnt/to/gitlab-ci/builds'
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```
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1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
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changes to take effect.
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1. Use `rsync` to move job logs from the current location to the new location:
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```shell
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sudo rsync -avzh --remove-source-files --ignore-existing --progress /var/opt/gitlab/gitlab-ci/builds/ /mnt/to/gitlab-ci/builds`
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```
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Use `--ignore-existing` so you don't override new job logs with older versions of the same log.
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1. Resume continuous integration data processing by editing `/etc/gitlab/gitlab.rb` and removing the `sidekiq` setting you updated earlier.
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1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
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changes to take effect.
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1. Remove the old job logs storage location:
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```shell
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sudo rm -rf /var/opt/gitlab/gitlab-ci/builds`
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```
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**In installations from source:**
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1. Edit `/home/git/gitlab/config/gitlab.yml` and add or amend the following lines:
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```yaml
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gitlab_ci:
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# The location where build logs are stored (default: builds/).
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# Relative paths are relative to Rails.root.
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builds_path: path/to/builds/
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```
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1. Save the file and [restart GitLab](restart_gitlab.md#installations-from-source) for the changes
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to take effect.
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## Uploading logs to object storage
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Archived logs are considered as [job artifacts](job_artifacts.md).
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Therefore, when you [set up the object storage integration](job_artifacts.md#object-storage-settings),
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job logs are automatically migrated to it along with the other job artifacts.
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See "Phase 3: uploading" in [Data flow](#data-flow) to learn about the process.
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## Prevent local disk usage
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If you want to avoid any local disk usage for job logs,
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you can do so using one of the following options:
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- Enable the [incremental logging](#incremental-logging-architecture) feature.
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- Set the [job logs location](#changing-the-job-logs-local-location)
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to an NFS drive.
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## How to remove job logs
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There isn't a way to automatically expire old job logs, but it's safe to remove
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them if they're taking up too much space. If you remove the logs manually, the
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job output in the UI is empty.
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For example, to delete all job logs older than 60 days, run the following from a shell in your GitLab instance:
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WARNING:
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This command permanently deletes the log files and is irreversible.
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```shell
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find /var/opt/gitlab/gitlab-rails/shared/artifacts -name "job.log" -mtime +60 -delete
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```
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NOTE:
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After execution, broken file references can be reported when running
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[`sudo gitlab-rake gitlab:artifacts:check`](raketasks/check.md#uploaded-files-integrity).
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For more information, see [delete references to missing artifacts](raketasks/check.md#delete-references-to-missing-artifacts).
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## Incremental logging architecture
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> - [Deployed behind a feature flag](../user/feature_flags.md), disabled by default.
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> - Enabled on GitLab.com.
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> - [Recommended for production use](https://gitlab.com/groups/gitlab-org/-/epics/4275) in GitLab 13.6.
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> - [Recommended for production use with AWS S3](https://gitlab.com/gitlab-org/gitlab/-/issues/273498) in GitLab 13.7.
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> - To use in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-incremental-logging).
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By default job logs are sent from the GitLab Runner in chunks and cached temporarily on disk
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in `/var/opt/gitlab/gitlab-ci/builds` by Omnibus GitLab. After the job completes,
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a background job archives the job log. The log is moved to `/var/opt/gitlab/gitlab-rails/shared/artifacts/`
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by default, or to object storage if configured.
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In a [scaled-out architecture](reference_architectures/index.md) with Rails and Sidekiq running on more than one
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server, these two locations on the file system have to be shared using NFS.
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To eliminate both file system requirements:
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1. Configure [object storage](job_artifacts.md#object-storage-settings) for storing archived job logs.
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1. [Enable the incremental logging feature](#enable-or-disable-incremental-logging), which uses Redis instead of disk space for temporary caching of job logs.
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### Technical details
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The data flow is the same as described in the [data flow section](#data-flow)
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with one change: _the stored path of the first two phases is different_. This incremental
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log architecture stores chunks of logs in Redis and a persistent store (object storage or database) instead of
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file storage. Redis is used as first-class storage, and it stores up-to 128KB
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of data. After the full chunk is sent, it is flushed to a persistent store, either object storage (temporary directory) or database.
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After a while, the data in Redis and a persistent store is archived to [object storage](#uploading-logs-to-object-storage).
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The data are stored in the following Redis namespace: `Gitlab::Redis::TraceChunks`.
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Here is the detailed data flow:
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1. The runner picks a job from GitLab
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1. The runner sends a piece of log to GitLab
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1. GitLab appends the data to Redis
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1. After the data in Redis reaches 128KB, the data is flushed to a persistent store (object storage or the database).
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1. The above steps are repeated until the job is finished.
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1. After the job is finished, GitLab schedules a Sidekiq worker to archive the log.
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1. The Sidekiq worker archives the log to object storage and cleans up the log
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in Redis and a persistent store (object storage or the database).
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### Limitations
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- [Redis Cluster is not supported](https://gitlab.com/gitlab-org/gitlab/-/issues/224171).
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- You must configure [object storage for CI/CD artifacts, logs, and builds](job_artifacts.md#object-storage-settings)
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before you enable the feature flag. After the flag is enabled, files cannot be written
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to disk, and there is no protection against misconfiguration.
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- There is [an epic tracking other potential limitations and improvements](https://gitlab.com/groups/gitlab-org/-/epics/3791).
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### Enable or disable incremental logging
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Incremental logging is under development, but [ready for production use as of GitLab 13.6](https://gitlab.com/groups/gitlab-org/-/epics/4275). It is
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deployed behind a feature flag that is **disabled by default**.
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[GitLab administrators with access to the GitLab Rails console](feature_flags.md)
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can enable it.
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Before you enable the feature flag:
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- Review [the limitations of incremental logging](#limitations).
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- [Enable object storage](job_artifacts.md#object-storage-settings).
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To enable incremental logging:
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```ruby
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Feature.enable(:ci_enable_live_trace)
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```
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Running jobs' logs continue to be written to disk, but new jobs use
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incremental logging.
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To disable incremental logging:
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```ruby
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Feature.disable(:ci_enable_live_trace)
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```
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Running jobs continue to use incremental logging, but new jobs write to the disk.
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