# DP Offline Ubuntu Upgrade Guide > Step-by-step operator runbook for preparing a Mirror Server, upgrading Stellar Cyber Data Processors to Ubuntu 24.04, completing DP 6.6.0 bringup, and validating the system. ## Upgrade Guide ### Start Here - [DP Offline Ubuntu Upgrade Guide](https://dpos.xdr.ooo/index.md): Follow one ordered runbook to prepare the Mirror Server, upgrade DP nodes to Ubuntu 24.04, complete DP 6.6.0 bringup, and validate the system. - [1. Upgrade Work Plan](https://dpos.xdr.ooo/runbook/work-plan.md): Understand the full maintenance flow, choose the correct path, and prepare the Mirror Server before touching any DP. ### Runbook - [2. Ubuntu 24.04 Server Installation](https://dpos.xdr.ooo/runbook/ubuntu-24-04-server-installation.md): Install the Ubuntu 24.04 Mirror Server with enough disk space, SSH access, and a usable root filesystem. - [3. Mirror Server Setup](https://dpos.xdr.ooo/runbook/mirror-server-setup.md): Install Mirror Manager, prepare the upgrade files, publish them over HTTP, and reach Upgrade Readiness PASS. - [4. DP Offline Ubuntu Upgrade](https://dpos.xdr.ooo/runbook/offline-dp-upgrade.md): Follow the generated DP procedure from snapshot and pause through Ubuntu 24.04, DP 6.6.0 bringup, resume, and health validation. - [5. Post-Upgrade Validation](https://dpos.xdr.ooo/runbook/post-upgrade-validation.md): Confirm Ubuntu 24.04, DP 6.6.0, cluster readiness, services, NTP, DNS, and recovery-snapshot cleanup criteria. ### Help & Recovery - [Troubleshooting](https://dpos.xdr.ooo/operations/troubleshooting.md): Diagnose Mirror Manager preparation, HTTP readiness, Phase 1 resume, and DP 6.6.0 bringup problems. - [Retry & Recovery](https://dpos.xdr.ooo/operations/retry-recovery.md): Resume Mirror Manager downloads safely, preserve partial files, and use snapshot recovery for destructive DP failures. - [Move a Prepared Server to a Dark Site](https://dpos.xdr.ooo/operations/move-dark-site.md): Reuse prepared artifacts after moving the Mirror Server into its final restricted network. - [Video Guides](https://dpos.xdr.ooo/video-guides.md): Supplemental videos for the DP Ubuntu offline upgrade workflow. ## Reference ### Planning & Requirements - [Requirements](https://dpos.xdr.ooo/getting-started/requirements.md): Current validated Mirror Server baseline, network paths, credentials, and DP safety requirements. - [Upgrade Path](https://dpos.xdr.ooo/getting-started/upgrade-path.md): Select the current Full OS Upgrade + Phase 2 or Phase 2 Only path from the DP starting state. - [Preparation Modes](https://dpos.xdr.ooo/getting-started/preparation-modes.md): Choose Full OS Upgrade + Phase 2 or Phase 2 Only from the current DP state. - [Prerequisites](https://dpos.xdr.ooo/getting-started/prerequisites.md): Pre-upgrade checks for the Mirror Server, DP snapshots, connectivity, credentials, and cluster configuration. - [Quick Start](https://dpos.xdr.ooo/getting-started/quickstart.md): Install the Mirror Manager, prepare upgrade files, verify readiness, and generate DP-side commands. ### Mirror Manager Reference - [Install Mirror Manager](https://dpos.xdr.ooo/mirror-manager/install.md): Install the current runtime on Ubuntu 24.04 and understand what the installer changes. - [Configuration](https://dpos.xdr.ooo/mirror-manager/configuration.md): Configure preparation mode, server IP, ACPS access, and cluster worker settings. - [Download and Prepare](https://dpos.xdr.ooo/mirror-manager/download-prepare.md): Prepare the selective OS Core and DP 6.6.0 Phase 2 bundle with resumable downloads and checksum validation. - [HTTP Distribution & Readiness](https://dpos.xdr.ooo/mirror-manager/http-readiness.md): Publish prepared files through nginx and verify the live artifacts before any DP upgrade begins. - [DP Client Upgrade Commands](https://dpos.xdr.ooo/mirror-manager/client-commands.md): Use Menu 7 as the authoritative source for DP-side commands and cluster execution order. ### DP Upgrade Reference - [Full OS Upgrade + Phase 2](https://dpos.xdr.ooo/dp-upgrade/full-os-upgrade.md): Upgrade Ubuntu 16.04 through each LTS hop to 24.04, then complete DP 6.6.0 bringup. - [Phase 2 Only](https://dpos.xdr.ooo/dp-upgrade/phase2-only.md): Bring a supported DP already on Ubuntu 24.04 to DP 6.6.0 without OS-hop preparation. - [DL/DA Clusters](https://dpos.xdr.ooo/dp-upgrade/clusters.md): Configure worker lists once, stage every node, and run final bringup from DL and DA masters. - [Post-Upgrade Validation](https://dpos.xdr.ooo/operations/validation.md): Validate Ubuntu 24.04, DP 6.6.0, cluster readiness, services, and the final operator state. ### System Reference - [Network Reference](https://dpos.xdr.ooo/reference/network.md): Current Mirror Server and DP connectivity requirements for the active workflow. - [Storage & Filesystem](https://dpos.xdr.ooo/reference/storage-layout.md): Current validated disk baseline, artifact sizes, and filesystem constraints. - [Status & Logs](https://dpos.xdr.ooo/reference/status-logs.md): Key Mirror Server and DP-side status files, generated commands, and Phase 1 evidence locations. - [Current vs. Historical Guidance](https://dpos.xdr.ooo/reference/current-vs-legacy.md): Understand which older 6.5.0, apt-cacher-ng, and full-mirror procedures have been superseded by the current Mirror Manager. > The links below point to documentation indexes. Follow each `/_llms/` index recursively until you reach documentation pages. ## Indexes - [Korean (28 pages)](https://dpos.xdr.ooo/_llms/ko.md): Documentation for Korean.