330 lines
12 KiB
Markdown
330 lines
12 KiB
Markdown
# Troubleshooting a reference architecture set up
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This page serves as the troubleshooting documentation if you followed one of
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the [reference architectures](index.md#reference-architectures).
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## Troubleshooting object storage
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### S3 API compatibility issues
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Not all S3 providers [are fully compatible](../../raketasks/backup_restore.md#other-s3-providers)
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with the Fog library that GitLab uses. Symptoms include:
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```plaintext
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411 Length Required
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```
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### GitLab Pages requires NFS
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If you intend to use [GitLab Pages](../../user/project/pages/index.md), this currently requires
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[NFS](../high_availability/nfs.md). There is [work in progress](https://gitlab.com/gitlab-org/gitlab-pages/issues/196)
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to remove this dependency. In the future, GitLab Pages may use
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[object storage](https://gitlab.com/gitlab-org/gitlab/-/issues/208135).
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The dependency on disk storage also prevents Pages being deployed using the
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[GitLab Helm chart](https://gitlab.com/gitlab-org/charts/gitlab/-/issues/37).
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### Incremental logging is required for CI to use object storage
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If you configure GitLab to use object storage for CI logs and artifacts,
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[you must also enable incremental logging](../job_logs.md#new-incremental-logging-architecture).
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### Proxy Download
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A number of the use cases for object storage allow client traffic to be redirected to the
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object storage back end, like when Git clients request large files via LFS or when
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downloading CI artifacts and logs.
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When the files are stored on local block storage or NFS, GitLab has to act as a proxy.
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With object storage, the default behavior is for GitLab to redirect to the object
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storage device rather than proxy the request.
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The `proxy_download` setting controls this behavior: the default is generally `false`.
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Verify this in the documentation for each use case. Set it to `true` to make
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GitLab proxy the files rather than redirect.
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When not proxying files, GitLab returns an
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[HTTP 302 redirect with a pre-signed, time-limited object storage URL](https://gitlab.com/gitlab-org/gitlab/-/issues/32117#note_218532298).
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This can result in some of the following problems:
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- If GitLab is using non-secure HTTP to access the object storage, clients may generate
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`https->http` downgrade errors and refuse to process the redirect. The solution to this
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is for GitLab to use HTTPS. LFS, for example, will generate this error:
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```plaintext
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LFS: lfsapi/client: refusing insecure redirect, https->http
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```
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- Clients will need to trust the certificate authority that issued the object storage
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certificate, or may return common TLS errors such as:
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```plaintext
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x509: certificate signed by unknown authority
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```
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- Clients will need network access to the object storage. Errors that might result
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if this access is not in place include:
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```plaintext
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Received status code 403 from server: Forbidden
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```
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### ETag mismatch
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Using the default GitLab settings, some object storage back-ends such as
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[MinIO](https://gitlab.com/gitlab-org/gitlab/-/issues/23188)
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and [Alibaba](https://gitlab.com/gitlab-org/charts/gitlab/-/issues/1564)
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might generate `ETag mismatch` errors.
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When using GitLab direct upload, the
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[workaround for MinIO](https://gitlab.com/gitlab-org/charts/gitlab/-/issues/1564#note_244497658)
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is to use the `--compat` parameter on the server.
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We are working on a fix to GitLab component Workhorse, and also
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a workaround, in the mean time, to
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[allow ETag verification to be disabled](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/18175).
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## Troubleshooting Redis
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If the application node cannot connect to the Redis node, check your firewall rules and
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make sure Redis can accept TCP connections under port `6379`.
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## Troubleshooting Gitaly
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### Checking versions when using standalone Gitaly nodes
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When using standalone Gitaly nodes, you must make sure they are the same version
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as GitLab to ensure full compatibility. Check **Admin Area > Gitaly Servers** on
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your GitLab instance and confirm all Gitaly Servers are `Up to date`.
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### `gitaly-debug`
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The `gitaly-debug` command provides "production debugging" tools for Gitaly and Git
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performance. It is intended to help production engineers and support
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engineers investigate Gitaly performance problems.
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If you're using GitLab 11.6 or newer, this tool should be installed on
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your GitLab / Gitaly server already at `/opt/gitlab/embedded/bin/gitaly-debug`.
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If you're investigating an older GitLab version you can compile this
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tool offline and copy the executable to your server:
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```shell
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git clone https://gitlab.com/gitlab-org/gitaly.git
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cd cmd/gitaly-debug
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GOOS=linux GOARCH=amd64 go build -o gitaly-debug
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```
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To see the help page of `gitaly-debug` for a list of supported sub-commands, run:
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```shell
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gitaly-debug -h
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```
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### Commits, pushes, and clones return a 401
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```plaintext
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remote: GitLab: 401 Unauthorized
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```
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You will need to sync your `gitlab-secrets.json` file with your GitLab
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app nodes.
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### Client side gRPC logs
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Gitaly uses the [gRPC](https://grpc.io/) RPC framework. The Ruby gRPC
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client has its own log file which may contain useful information when
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you are seeing Gitaly errors. You can control the log level of the
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gRPC client with the `GRPC_LOG_LEVEL` environment variable. The
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default level is `WARN`.
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You can run a gRPC trace with:
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```shell
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sudo GRPC_TRACE=all GRPC_VERBOSITY=DEBUG gitlab-rake gitlab:gitaly:check
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```
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### Observing `gitaly-ruby` traffic
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[`gitaly-ruby`](../gitaly/index.md#gitaly-ruby) is an internal implementation detail of Gitaly,
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so, there's not that much visibility into what goes on inside
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`gitaly-ruby` processes.
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If you have Prometheus set up to scrape your Gitaly process, you can see
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request rates and error codes for individual RPCs in `gitaly-ruby` by
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querying `grpc_client_handled_total`. Strictly speaking, this metric does
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not differentiate between `gitaly-ruby` and other RPCs, but in practice
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(as of GitLab 11.9), all gRPC calls made by Gitaly itself are internal
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calls from the main Gitaly process to one of its `gitaly-ruby` sidecars.
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Assuming your `grpc_client_handled_total` counter only observes Gitaly,
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the following query shows you RPCs are (most likely) internally
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implemented as calls to `gitaly-ruby`:
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```prometheus
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sum(rate(grpc_client_handled_total[5m])) by (grpc_method) > 0
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```
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### Repository changes fail with a `401 Unauthorized` error
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If you're running Gitaly on its own server and notice that users can
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successfully clone and fetch repositories (via both SSH and HTTPS), but can't
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push to them or make changes to the repository in the web UI without getting a
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`401 Unauthorized` message, then it's possible Gitaly is failing to authenticate
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with the other nodes due to having the wrong secrets file.
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Confirm the following are all true:
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- When any user performs a `git push` to any repository on this Gitaly node, it
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fails with the following error (note the `401 Unauthorized`):
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```shell
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remote: GitLab: 401 Unauthorized
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To <REMOTE_URL>
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! [remote rejected] branch-name -> branch-name (pre-receive hook declined)
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error: failed to push some refs to '<REMOTE_URL>'
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```
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- When any user adds or modifies a file from the repository using the GitLab
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UI, it immediately fails with a red `401 Unauthorized` banner.
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- Creating a new project and [initializing it with a README](../../gitlab-basics/create-project.md#blank-projects)
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successfully creates the project but doesn't create the README.
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- When [tailing the logs](https://docs.gitlab.com/omnibus/settings/logs.html#tail-logs-in-a-console-on-the-server) on an app node and reproducing the error, you get `401` errors
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when reaching the `/api/v4/internal/allowed` endpoint:
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```shell
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# api_json.log
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{
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"time": "2019-07-18T00:30:14.967Z",
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"severity": "INFO",
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"duration": 0.57,
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"db": 0,
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"view": 0.57,
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"status": 401,
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"method": "POST",
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"path": "\/api\/v4\/internal\/allowed",
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"params": [
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{
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"key": "action",
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"value": "git-receive-pack"
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},
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{
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"key": "changes",
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"value": "REDACTED"
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},
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{
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"key": "gl_repository",
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"value": "REDACTED"
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},
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{
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"key": "project",
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"value": "\/path\/to\/project.git"
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},
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{
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"key": "protocol",
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"value": "web"
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},
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{
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"key": "env",
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"value": "{\"GIT_ALTERNATE_OBJECT_DIRECTORIES\":[],\"GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE\":[],\"GIT_OBJECT_DIRECTORY\":null,\"GIT_OBJECT_DIRECTORY_RELATIVE\":null}"
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},
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{
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"key": "user_id",
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"value": "2"
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},
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{
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"key": "secret_token",
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"value": "[FILTERED]"
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}
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],
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"host": "gitlab.example.com",
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"ip": "REDACTED",
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"ua": "Ruby",
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"route": "\/api\/:version\/internal\/allowed",
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"queue_duration": 4.24,
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"gitaly_calls": 0,
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"gitaly_duration": 0,
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"correlation_id": "XPUZqTukaP3"
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}
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# nginx_access.log
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[IP] - - [18/Jul/2019:00:30:14 +0000] "POST /api/v4/internal/allowed HTTP/1.1" 401 30 "" "Ruby"
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```
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To fix this problem, confirm that your `gitlab-secrets.json` file
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on the Gitaly node matches the one on all other nodes. If it doesn't match,
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update the secrets file on the Gitaly node to match the others, then
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[reconfigure the node](../restart_gitlab.md#omnibus-gitlab-reconfigure).
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### Command line tools cannot connect to Gitaly
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If you are having trouble connecting to a Gitaly node with command line (CLI) tools, and certain actions result in a `14: Connect Failed` error message, it means that gRPC cannot reach your Gitaly node.
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Verify that you can reach Gitaly via TCP:
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```shell
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sudo gitlab-rake gitlab:tcp_check[GITALY_SERVER_IP,GITALY_LISTEN_PORT]
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```
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If the TCP connection fails, check your network settings and your firewall rules. If the TCP connection succeeds, your networking and firewall rules are correct.
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If you use proxy servers in your command line environment, such as Bash, these can interfere with your gRPC traffic.
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If you use Bash or a compatible command line environment, run the following commands to determine whether you have proxy servers configured:
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```shell
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echo $http_proxy
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echo $https_proxy
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```
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If either of these variables have a value, your Gitaly CLI connections may be getting routed through a proxy which cannot connect to Gitaly.
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To remove the proxy setting, run the following commands (depending on which variables had values):
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```shell
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unset http_proxy
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unset https_proxy
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```
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### Gitaly not listening on new address after reconfiguring
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When updating the `gitaly['listen_addr']` or `gitaly['prometheus_listen_addr']` values, Gitaly may continue to listen on the old address after a `sudo gitlab-ctl reconfigure`.
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When this occurs, performing a `sudo gitlab-ctl restart` will resolve the issue. This will no longer be necessary after [this issue](https://gitlab.com/gitlab-org/gitaly/issues/2521) is resolved.
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### Permission denied errors appearing in Gitaly logs when accessing repositories from a standalone Gitaly node
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If this error occurs even though file permissions are correct, it's likely that
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the Gitaly node is experiencing
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[clock drift](https://en.wikipedia.org/wiki/Clock_drift).
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Please ensure that the GitLab and Gitaly nodes are synchronized and use an NTP time
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server to keep them synchronized if possible.
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## Troubleshooting the GitLab Rails application
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- `mount: wrong fs type, bad option, bad superblock on`
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You have not installed the necessary NFS client utilities. See step 1 above.
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- `mount: mount point /var/opt/gitlab/... does not exist`
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This particular directory does not exist on the NFS server. Ensure
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the share is exported and exists on the NFS server and try to remount.
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## Troubleshooting Monitoring
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If the monitoring node is not receiving any data, check that the exporters are
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capturing data.
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```shell
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curl http[s]://localhost:<EXPORTER LISTENING PORT>/metric
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```
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or
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```shell
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curl http[s]://localhost:<EXPORTER LISTENING PORT>/-/metric
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```
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