214 lines
9.3 KiB
Markdown
214 lines
9.3 KiB
Markdown
---
|
|
stage: Verify
|
|
group: Runner
|
|
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
|
|
type: reference
|
|
---
|
|
|
|
# Job logs **(FREE SELF)**
|
|
|
|
> [Renamed from job traces to job logs](https://gitlab.com/gitlab-org/gitlab/-/issues/29121) in GitLab 12.5.
|
|
|
|
Job logs are sent by a runner while it's processing a job. You can see
|
|
logs in job pages, pipelines, email notifications, and so on.
|
|
|
|
## Data flow
|
|
|
|
In general, there are two states for job logs: `log` and `archived log`.
|
|
In the following table you can see the phases a log goes through:
|
|
|
|
| Phase | State | Condition | Data flow | Stored path |
|
|
| -------------- | ------------ | ----------------------- | -----------------------------------------| ----------- |
|
|
| 1: patching | log | When a job is running | Runner => Puma => file storage | `#{ROOT_PATH}/gitlab-ci/builds/#{YYYY_mm}/#{project_id}/#{job_id}.log` |
|
|
| 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` |
|
|
| 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` |
|
|
|
|
The `ROOT_PATH` varies per environment. For Omnibus GitLab it
|
|
would be `/var/opt/gitlab`, and for installations from source
|
|
it would be `/home/git/gitlab`.
|
|
|
|
## Changing the job logs local location
|
|
|
|
To change the location where the job logs are stored, follow the steps below.
|
|
|
|
**In Omnibus installations:**
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb` and add or amend the following line:
|
|
|
|
```ruby
|
|
gitlab_ci['builds_directory'] = '/mnt/to/gitlab-ci/builds'
|
|
```
|
|
|
|
1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
|
|
changes to take effect.
|
|
|
|
Alternatively, if you have existing job logs you can follow
|
|
these steps to move the logs to a new location without losing any data.
|
|
|
|
1. Pause continuous integration data processing by updating this setting in `/etc/gitlab/gitlab.rb`.
|
|
Jobs in progress are not affected, based on how [data flow](#data-flow) works.
|
|
|
|
```ruby
|
|
sidekiq['queue_selector'] = true
|
|
sidekiq['queue_groups'] = [
|
|
"feature_category!=continuous_integration"
|
|
]
|
|
```
|
|
|
|
1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
|
|
changes to take effect.
|
|
1. Set the new storage location in `/etc/gitlab/gitlab.rb`:
|
|
|
|
```ruby
|
|
gitlab_ci['builds_directory'] = '/mnt/to/gitlab-ci/builds'
|
|
```
|
|
|
|
1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
|
|
changes to take effect.
|
|
1. Use `rsync` to move job logs from the current location to the new location:
|
|
|
|
```shell
|
|
sudo rsync -avzh --remove-source-files --ignore-existing --progress /var/opt/gitlab/gitlab-ci/builds/ /mnt/to/gitlab-ci/builds`
|
|
```
|
|
|
|
Use `--ignore-existing` so you don't override new job logs with older versions of the same log.
|
|
1. Resume continuous integration data processing by editing `/etc/gitlab/gitlab.rb` and removing the `sidekiq` setting you updated earlier.
|
|
1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the
|
|
changes to take effect.
|
|
1. Remove the old job logs storage location:
|
|
|
|
```shell
|
|
sudo rm -rf /var/opt/gitlab/gitlab-ci/builds`
|
|
```
|
|
|
|
**In installations from source:**
|
|
|
|
1. Edit `/home/git/gitlab/config/gitlab.yml` and add or amend the following lines:
|
|
|
|
```yaml
|
|
gitlab_ci:
|
|
# The location where build logs are stored (default: builds/).
|
|
# Relative paths are relative to Rails.root.
|
|
builds_path: path/to/builds/
|
|
```
|
|
|
|
1. Save the file and [restart GitLab](restart_gitlab.md#installations-from-source) for the changes
|
|
to take effect.
|
|
|
|
## Uploading logs to object storage
|
|
|
|
Archived logs are considered as [job artifacts](job_artifacts.md).
|
|
Therefore, when you [set up the object storage integration](job_artifacts.md#object-storage-settings),
|
|
job logs are automatically migrated to it along with the other job artifacts.
|
|
|
|
See "Phase 4: uploading" in [Data flow](#data-flow) to learn about the process.
|
|
|
|
## Prevent local disk usage
|
|
|
|
If you want to avoid any local disk usage for job logs,
|
|
you can do so using one of the following options:
|
|
|
|
- Enable the [incremental logging](#incremental-logging-architecture) feature.
|
|
- Set the [job logs location](#changing-the-job-logs-local-location)
|
|
to an NFS drive.
|
|
|
|
## How to remove job logs
|
|
|
|
There isn't a way to automatically expire old job logs, but it's safe to remove
|
|
them if they're taking up too much space. If you remove the logs manually, the
|
|
job output in the UI is empty.
|
|
|
|
For example, to delete all job logs older than 60 days, run the following from a shell in your GitLab instance:
|
|
|
|
WARNING:
|
|
This command permanently deletes the log files and is irreversible.
|
|
|
|
```shell
|
|
find /var/opt/gitlab/gitlab-rails/shared/artifacts -name "job.log" -mtime +60 -delete
|
|
```
|
|
|
|
NOTE:
|
|
After execution, broken file references can be reported when running
|
|
[`sudo gitlab-rake gitlab:artifacts:check`](raketasks/check.md#uploaded-files-integrity).
|
|
For more information, see [delete references to missing artifacts](raketasks/check.md#delete-references-to-missing-artifacts).
|
|
|
|
## Incremental logging architecture
|
|
|
|
> - [Deployed behind a feature flag](../user/feature_flags.md), disabled by default.
|
|
> - Enabled on GitLab.com.
|
|
> - [Recommended for production use](https://gitlab.com/groups/gitlab-org/-/epics/4275) in GitLab 13.6.
|
|
> - [Recommended for production use with AWS S3](https://gitlab.com/gitlab-org/gitlab/-/issues/273498) in GitLab 13.7.
|
|
> - To use in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-incremental-logging). **(FREE SELF)**
|
|
|
|
By default job logs are sent from the GitLab Runner in chunks and cached temporarily on disk
|
|
in `/var/opt/gitlab/gitlab-ci/builds` by Omnibus GitLab. After the job completes,
|
|
a background job archives the job log. The log is moved to `/var/opt/gitlab/gitlab-rails/shared/artifacts/`
|
|
by default, or to object storage if configured.
|
|
|
|
In a [scaled-out architecture](reference_architectures/index.md) with Rails and Sidekiq running on more than one
|
|
server, these two locations on the filesystem have to be shared using NFS.
|
|
|
|
To eliminate both filesystem requirements:
|
|
|
|
- [Enable the incremental logging feature](#enable-or-disable-incremental-logging), which uses Redis instead of disk space for temporary caching of job logs.
|
|
- Configure [object storage](job_artifacts.md#object-storage-settings) for storing archived job logs.
|
|
|
|
### Technical details
|
|
|
|
The data flow is the same as described in the [data flow section](#data-flow)
|
|
with one change: _the stored path of the first two phases is different_. This incremental
|
|
log architecture stores chunks of logs in Redis and a persistent store (object storage or database) instead of
|
|
file storage. Redis is used as first-class storage, and it stores up-to 128KB
|
|
of data. After the full chunk is sent, it is flushed to a persistent store, either object storage (temporary directory) or database.
|
|
After a while, the data in Redis and a persistent store is archived to [object storage](#uploading-logs-to-object-storage).
|
|
|
|
The data are stored in the following Redis namespace: `Gitlab::Redis::TraceChunks`.
|
|
|
|
Here is the detailed data flow:
|
|
|
|
1. The runner picks a job from GitLab
|
|
1. The runner sends a piece of log to GitLab
|
|
1. GitLab appends the data to Redis
|
|
1. After the data in Redis reaches 128KB, the data is flushed to a persistent store (object storage or the database).
|
|
1. The above steps are repeated until the job is finished.
|
|
1. After the job is finished, GitLab schedules a Sidekiq worker to archive the log.
|
|
1. The Sidekiq worker archives the log to object storage and cleans up the log
|
|
in Redis and a persistent store (object storage or the database).
|
|
|
|
### Limitations
|
|
|
|
- [Redis cluster is not supported](https://gitlab.com/gitlab-org/gitlab/-/issues/224171).
|
|
- You must configure [object storage for CI/CD artifacts, logs, and builds](job_artifacts.md#object-storage-settings)
|
|
before you enable the feature flag. After the flag is enabled, files cannot be written
|
|
to disk, and there is no protection against misconfiguration.
|
|
- There is [an epic tracking other potential limitations and improvements](https://gitlab.com/groups/gitlab-org/-/epics/3791).
|
|
|
|
### Enable or disable incremental logging **(FREE SELF)**
|
|
|
|
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
|
|
deployed behind a feature flag that is **disabled by default**.
|
|
[GitLab administrators with access to the GitLab Rails console](feature_flags.md)
|
|
can enable it.
|
|
|
|
Before you enable the feature flag:
|
|
|
|
- Review [the limitations of incremental logging](#limitations).
|
|
- [Enable object storage](job_artifacts.md#object-storage-settings).
|
|
|
|
To enable incremental logging:
|
|
|
|
```ruby
|
|
Feature.enable(:ci_enable_live_trace)
|
|
```
|
|
|
|
Running jobs' logs continue to be written to disk, but new jobs use
|
|
incremental logging.
|
|
|
|
To disable incremental logging:
|
|
|
|
```ruby
|
|
Feature.disable(:ci_enable_live_trace)
|
|
```
|
|
|
|
Running jobs continue to use incremental logging, but new jobs write to the disk.
|