How to run the Codex AI coding agent securely in the cloud

Running Codex securely in the cloud involves placing the agent in an isolated workspace with narrowly scoped repository access, development tools, credentials, file permissions, and network connectivity, while separately configuring Codex command-sandbox and approval settings. The guide explains how to create a Northflank Cloud Harness, authenticate Codex, connect a repository and branch, configure runtime resources, storage, secrets, and development dependencies, then begin with a small, clearly bounded task such as fixing a failing test. It emphasizes reviewing permissions, installation scripts, connected tools, generated code changes, untracked files, test results, and requests for expanded access before merging work through a normal pull-request process. It also covers configuring ports for application previews, using browser terminals or SSH for workspace access, monitoring CPU and memory use, and pausing or deleting workspaces while preserving files through persistent storage when needed. Northflank can run these environments on managed infrastructure or in a user’s own cloud account, and teams can share a workspace only with collaborators authorized to access its repository, data, and credentials.

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