[Docker] VSCodium on Synology NAS

I decided to install VSCodium on my Synology NAS using Docker. Honestly, I’m not sure if I’ll use it much right now, but I figured it could be handy to have it set up for the future. That’s pretty much the case with most of the applications I experiment with on Docker—something I may not need today, but could become useful later.

Here’s my docker-compose.yaml configuration:

services:
  # ── VSCodium (Web-based VS Code build via LinuxServer.io) ──
  vscodium:
    image: lscr.io/linuxserver/vscodium:latest
    container_name: vscodium
    cap_add:
      - IPC_LOCK                          # Prevent memory swapping (better perf)
    security_opt:
      # - seccomp:unconfined              # Optional: loosen restrictions if GUI issues
      - no-new-privileges:true            # Prevent privilege escalation
    environment:
      - PUID=1026                         # NAS user ID (adjust to match DSM account)
      - PGID=100                          # NAS group ID (adjust if needed)
      - TZ=America/New_York               # Set timezone
      - CUSTOM_USER=YOUROWNUSERNAME       # Login username
      - PASSWORD=YOUROWNPASSWORD          # Login password
    volumes:
      - /volume1/docker/vscodium/config:/config    # Config and extensions
    ports:
      - "4000:3000"                       # Web access
      - "4001:3001"                       # NoVNC/VNC (optional)
    shm_size: "1gb"                       # Shared memory (for Electron-based apps)
    restart: unless-stopped

I used several online references to get this running, but then customized a few things to fit my needs:

• Security Options: I adjusted the security options for a safer setup.
• User & Group IDs: Updated PUID and PGID to match my Synology NAS account. You can easily find these by running the id command via SSH. On Synology, the first user account typically starts with 1026, and the group ID 100 usually corresponds to the default users group.
• Login Credentials: To prevent open access to VSCodium just by knowing the URL, I added CUSTOM_USER and PASSWORD environment variables. This enforces a username/password login prompt.

If I end up using VSCodium more often, I’ll probably add a dedicated workspace volume so I can work directly with files stored on my NAS. That should make it much more practical for real use.