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Troubleshoot CI

This topic contains troubleshooting information for error messages and other issues that can arise with Harness CI. For more Harness troubleshooting guidance, go to Troubleshooting Harness.

Troubleshooting tools

AIDA and debug mode can help you troubleshoot errors and other issues in Harness CI.

If you cannot find a resolution, please contact Harness Support or visit the Harness Community Forum.

Secrets with line breaks and shell-interpreted special characters

For information about handling secrets with new line characters or other shell-interpreted special characters, go to Add and reference text secrets - Line breaks and shell-interpreted characters.

Git connector fails to connect to the SCM service

The following SCM service errors can occur with Git connectors.

SCM request failed with: UNKNOWN

This error may occur if your Git connector uses SSH authentication. To resolve this error, make sure HTTPS is enabled on port 443. This is the protocol and port used by the Harness connection test for Git connectors.

SCM connection errors when using self-signed certificates

If you have configured your build infrastructure to use self-signed certificates, your builds may fail when the Git connector attempts to connect to the SCM service. Build logs may contain the following error messages:

Connectivity Error while communicating with the scm service
Unable to connect to Git Provider, error while connecting to scm service

To resolve this issue, add SCM_SKIP_SSL=true to the environment section of the delegate YAML.

For example, here is the environment section of a docker-compose.yml file with the SCM_SKIP_SSL variable:

- NEXT_GEN=true

For more information about self-signed certificates, delegates, and delegate environment variables, go to:

Clone codebase errors

For troubleshooting information related to cloning codebases, go to Create and configure a codebase - Troubleshooting.

Output variable length limit

If an output variable's length is greater than 64KB, steps can fail or truncate the output. If you need to export large amounts of data, consider uploading artifacts or exporting artifacts by email.

Multi-line output variables truncated

Output variables don't support multi-line output. Content after the first line is truncated. If you need to export multi-line data, consider uploading artifacts or exporting artifacts by email.

Truncated execution logs

Each CI step supports a maximum log size of 5MB. Harness truncates logs larger than 5MB. If necessary, you can export full logs.

Furthermore, there is a single-line limit of 25KB. If an individual line exceeds this limit, it is truncated and ends with (log line truncated).

Note that the CI log limit is different from the Harness CD log limit.

Export full logs

If your log files are larger than 5MB, you can export execution logs to an external cache and examine the full logs there.

  1. Add a step to your pipeline that records each step's complete logs into one or more files.
  2. If you have a lot of log files or your logs are large, add a step to compress the log files into an archive.
  3. Use an Upload Artifact step to upload the log files to cloud storage.
  4. Repeat the above process for each stage in your pipeline for which you want to export the full logs.
  5. Examine the log files in your cloud storage. If you used the S3 Upload and Publish or Artifact Metadata Publisher plugins, you can find direct links to your uploaded files on the Artifacts tab on the Build detail page.
Log forwarding

You can also use a service, such as env0, to forward logs to platforms suited for ingesting large logs.

Step logs disappear

If step logs disappear from pipelines that are using a Kubernetes cluster build infrastructure, you must either allow outbound communication with or contact Harness Support to enable the CI_INDIRECT_LOG_UPLOAD feature flag.

For more information about configuring connectivity, go to:

Docker Hub rate limiting

By default, Harness uses anonymous Docker access to connect to pull Harness images. If you experience rate limiting issues when pulling images, try one of these solutions:

  • Use credentialed access, rather than anonymous access, to pull Harness CI images.
  • Configure the default Docker connector to pull images from the public Harness GCR project instead of Docker Hub.
  • Pull Harness images from your own private registry.

For instructions on each of these options, go to Connect to the Harness container image registry.

Can't connect to Docker daemon

Error messages like cannot connect to the Docker daemon indicate that you might have multiple steps attempting to run Docker at the same time. This can occur when running GitHub Actions in stages that have Docker-in-Docker (DinD) Background steps.

Actions that launch DinD: You can't use GitHub Actions that launch DinD in the same stage where DinD is already running in a Background step. If possible, run the GitHub Action in a separate stage or try to find a GitHub Action that doesn't use DinD.

Actions that launch the Docker daemon: If your Action attempts to launch the Docker daemon, and you have a DinD Background step in the same stage, you must add PLUGIN_DAEMON_OFF: true as a stage variable. For example:

type: String
description: ""
required: false
value: "true"

Harness Cloud: You don't need DinD Background steps with Harness Cloud build infrastructure, and you can run GitHub Actions in Action steps instead of Plugin steps.

Out of memory errors with Gradle

If a build that uses Gradle experiences out of memory errors, add the following to your file:

-XX:+UnlockExperimentalVMOptions -XX:+UseContainerSupport

Your Java options must use UseContainerSupport instead of UseCGroupMemoryLimitForHeap, which was removed in JDK 11.

Step continues running for a long time after the command is complete

In Windows builds, if the primary command in a Powershell script starts a long-running subprocess, the step continues to run as long as the subprocess exists (or until it reaches the step timeout limit).

  1. Check if your command launches a subprocess.
  2. If it does, check whether the process is exiting, and how long it runs before exiting.
  3. If the run time is unacceptable, you might need to add commands to sleep or force exit the subprocess.

Here's a sample pipeline that includes a Powershell script that starts a subprocess. The subprocess runs for no more than two minutes.

identifier: subprocess_demo
name: subprocess_demo
projectIdentifier: default
orgIdentifier: default
tags: {}
- stage:
identifier: BUild
type: CI
name: Build
cloneCodebase: true
- step:
identifier: Run_1
type: Run
name: Run_1
image: jtapsgroup/javafx-njs:latest
shell: Powershell
command: |-
cd folder
gradle --version
Start-Process -NoNewWindow -FilePath "powershell" -ArgumentList "Start-Sleep -Seconds 120"
Write-Host "Done!"
memory: 3Gi
cpu: "1"
type: KubernetesDirect
initTimeout: 900s
automountServiceAccountToken: true
nodeSelector: windows
os: Windows
enabled: false
paths: []
type: branch
branch: main

Can't generate SonarQube report due to shallow clone

  • Error message: Shallow clone detected, no blame information will be provided. You can convert to non-shallow with 'git fetch --unshallow
  • Cause: If the depth setting in your pipeline's codebase configuration is shallow, SonarQube can't generate a report. This is a known SonarQube issue.
  • Solution: Change the depth to 0.

Build infrastructure issues

CI pods appear to be evicted by Kubernetes autoscaling

Harness CI pods shouldn't be evicted due to autoscaling of Kubernetes nodes because Kubernetes doesn't evict pods that aren't backed by a controller object. However, if you notice either sporadic pod evictions or failures in the Initialize step in your Build logs, add the following annotation to your Kubernetes cluster build infrastructure settings:

"": "false"

Delegate is not able to connect to the created build farm

If you get this error when using a Kubernetes cluster build infrastructure, and you have confirmed that the delegate is installed in the same cluster where the build is running, you may need to allow port 20001 in your network policy to allow pod-to-pod communication.

For more delegate and Kubernetes troubleshooting guidance, go to Troubleshooting Harness.

AKS builds timeout

Azure Kubernetes Service (AKS) security group restrictions can cause builds running on an AKS build infrastructure to timeout.

If you have a custom network security group, it must allow inbound traffic on port 8080, which the delegate service uses.

For more information, refer to the following Microsoft Azure troubleshooting documentation: A custom network security group blocks traffic.

Istio MTLS STRICT mode

A headless service is required if you are using Istio MTLS STRICT mode.

Harness Cloud build infrastructure issues

For troubleshooting information for Harness Cloud build infrastructure, go to Use Harness Cloud build infrastructure.

AWS VM build infrastructure issues

For troubleshooting information for AWS VM build infrastructures, go to Set up an AWS VM build infrastructure - Troubleshooting.

Local runner build infrastructure issues

For troubleshooting information for local runner build infrastructures, go to Set up a local runner build infrastructure - Troubleshooting.

Test Intelligence issues

You might encounter these issues when using Test Intelligence.

TI with Maven

If you encounter issues with Test Intelligence when using Maven as your build tool, check the following configurations:

  • If your pom.xml contains <argLine>, then you must modify your argLine setup as explained in Enable TI for Java, Kotlin, Scala - Build tool setting.

  • If you attach Jacoco or any agent while running unit tests, then you must modify your argLine setup as explained in Enable TI for Java, Kotlin, Scala - Build tool setting.

  • If you use Jacoco, Surefire, or Failsafe, make sure that forkCount is not set to 0. For example, the following configuration in pom.xml removes forkCount and applies useSystemClassLoader as a workaround:

    <!-- <forkCount>0</forkCount> -->

TI with Bazel

If you encounter issues with Test Intelligence when using Bazel as your build tool, and you use a Bazel container image in a build infrastructure where Bazel isn't already installed, your pipeline must install Bazel in a Run step prior to the Run Tests step. This is because bazel query is called before the container image is pulled.

Bazel is already installed on Harness Cloud runners, and you don't need to specify a container image. For other build infrastructures, you must manually confirm that Bazel is already installed.

TI with Gradle

If you encounter issues with Test Intelligence when using Gradle as your build tool, check your configuration's Gradle compatibility, as explained in Enable TI for Java, Kotlin, Scala - Build tool setting.

TI for Python

If you encounter errors with TI for Python, make sure you have met the following requirements:

  • Your project is written in Python 3, and your repo is a pure Python 3 repo.
  • You don't use resource file relationships. TI for Python doesn't support resource file relationships.
  • You don't use dynamic loading and metaclasses. TI for Python might miss tests or changes in repos that use dynamic loading or metaclasses.
  • Your build tool is pytest or unittest.
  • The Python 3 binary is preinstalled on the build machine, available in the specified Container Registry and Image, or installed at runtime in Pre-Command.
  • If you use another command, such as python, to invoke Python 3, you have added an alias, such as python3 = "python".

If you get errors related to code coverage for Python:

  • If you included Build Arguments, these don't need coverage flags (--cov or coverage).
  • You don't need to install coverage tools in Pre-Command.

TI for Ruby

Cannot find rspec helper file

The following log line indicates that Test Intelligence can't locate an rspec helper file in your code repo:

Unable to write rspec helper file automatically cannot find rspec helper file. Please make change manually to enable TI.

This usually occurs if the helper file has a name other than spec_helper.rb.

To resolve this, add the following line to your rspec helper file:

set -e; echo "require_relative '/tmp/engine/ruby/harness/ruby-agent/test_intelligence.rb'" >> lib/vagrant/shared_helpers.rb

Dynamically generated code

Test Intelligence results can be inaccurate for Ruby repos using dynamically generated code.

Rails apps using Spring

Test Intelligence results can be inaccurate for Rails apps using Spring.