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Right after cloning Y Combinator's qm repository in an internal on-premises environment, attempting to connect to a local development PostgreSQL or Redis results in an immediate ECONNREFUSED error. This is because, due to the isolated network namespace structure of Docker containers, localhost inside the container points only to the container's own virtual loopback interface rather than the host. As proven by Shopify's internal platform and Stripe's coding system operation cases, stably setting up the network boundary between the agent brain and the sandbox is essential.
To solve this issue, you need to apply Docker Engine's host-gateway mapping technology to inject a host-exclusive virtual DNS entry. First, create a docker-compose.override.yml file to define the host communication path.
docker-compose.override.yml file in the project root and add the host.docker.internal:host-gateway setting to the extra_hosts block.qm-internal-bridge bridge network in the networks entry and allocate the subnet range to 172.28.0.0/16.Applying this configuration can shorten the time required for internal database integration testing from 4 hours to 15 minutes.
When initially running the qm harness's strict security posture, EACCES or Permission Denied errors frequently occur. This is because the qm core's validation function treats not only modifications to the target working directory but also internal temporary file areas generated by the runtime as potential changes, thereby stopping the command.
To meet the security audit team's requirements and shorten the approval period by 2 weeks, the file system must be strictly stratified.
read_only: true) in the Docker configuration./tmp and /home/sandbox/.cache paths respectively by using the tmpfs option.Through this volume mount configuration, you can complete a structure where attackers cannot permanently store malicious scripts in the host OS from inside the container.
When multiple backend developers simultaneously access the same qm instance to perform agent tasks, using a single shared directory causes SQLITE_BUSY errors and Git index lock conflicts. Because the qm architecture defines scopes for personal workspaces, channels, and project units as permission and resource ownership units, the single-directory sharing setup must be reorganized into a scope-based dynamic mount structure.
To fundamentally block simultaneous data overwrite errors, apply volume isolation utilizing scope hash values.
${SCOPE_ID} variable into the deployment configuration file to dynamically generate container names and volume labels./var/qm/workspaces/${SCOPE_ID}/src path.Applying this structure completely blocks data overwrite errors that occur during simultaneous agent execution and guarantees an independent workspace.
When an agent pulls code or pushes branches, if the internal Git server authentication token is stored in plaintext on a sandbox internal disk file, there is a risk of credential theft. For secure credential management, a memory-based injection framework must be built.
Configure the pipeline that exchanges credentials solely in memory as follows:
0700.GIT_ASKPASS interface in the memory path.Executing the umount command after the task ends immediately returns the memory region, completely eliminating the possibility of credentials remaining and complying with internal authentication policies.