The Tool Desk
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The commands below take you from a clean Linux VPS to a restart-safe Redis deployment, then cover Compose, backups, readiness checks, and the failure modes that most often affect game servers and other latency-sensitive applications.
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What this deployment looks like
Docker runs the Redis server process in an isolated container. The VPS supplies the kernel, disk, network controls, and Docker Engine. Your application connects to Redis over TCP port 6379. If the application runs on the same VPS, Redis can be published on loopback so no external host can reach it. If another private host must connect, publish only on the VPS’s private interface and restrict that address range in both firewall layers.
A container’s writable layer is not a durable database strategy. Replacing or removing the container can remove files written there, so production use requires a host directory or Docker volume mounted at Redis’s /data path, plus backups that you have actually tested restoring.
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Prerequisites on the Linux VPS
- A supported Linux distribution with administrative access over SSH.
- A VPS security-group or provider firewall that you can edit.
- Enough memory for Redis, its dataset, and the operating system. Set an explicit memory policy if the workload can grow beyond available RAM.
- Persistent storage with free space for the dataset and Redis persistence files.
- A tested Redis image version compatible with your application. Use an explicit tag rather than the mutable
redistag.
Install Docker using the instructions maintained for your distribution and release. Distribution packages and Docker’s supported installation method change over time; do not copy an installation command intended for a different Linux family. After installation, confirm that the daemon is running:
docker version
docker infoKeep Docker administration over SSH. Do not expose the Docker daemon on a public TCP port merely to make remote administration convenient.
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Start Redis with Docker
Quick test instance
For a short-lived test, start the official Redis image with an explicit version tag:
docker run -d --name redis -p 6379:6379 redis:<version>Replace <version> with the version you selected and tested. The -d option detaches, --name redis gives the container a stable name, and -p 6379:6379 publishes the container’s Redis port on every host interface unless you specify a host address.
Verify from inside the container
Run the Redis command-line client inside the running container:
docker exec -it redis redis-cli pingA healthy server returns PONG. You can also use a locally installed redis-cli and connect to 127.0.0.1:6379 when the port is published on loopback.
Inspect the process and logs
docker ps
docker logs --tail 100 redis
docker inspect redisdocker ps confirms that the container is running; the logs usually reveal an invalid configuration, permission problem, or port collision that caused an immediate exit.
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Make Redis data survive container replacement
Use a host directory or a named Docker volume mounted at /data. The following host-directory example makes the storage location obvious for snapshots and backup tooling:
mkdir -p /opt/redis/data
docker run -d --name redis
-p 127.0.0.1:6379:6379
-v /opt/redis/data:/data
redis:<version> redis-server --appendonly yesThe loopback binding limits access to processes on the VPS. The bind mount maps /opt/redis/data on the host to Redis’s data directory, and --appendonly yes enables append-only persistence. The storage is still your responsibility: include it in VPS snapshots or a separate backup system, monitor free space, and periodically perform a restore test on an isolated instance.
A named volume is another valid Docker-managed option:
docker volume create redis-data
docker run -d --name redis
-p 127.0.0.1:6379:6379
-v redis-data:/data
redis:<version> redis-server --appendonly yesChoose one storage approach for a given container. Do not assume that deleting and recreating a container will preserve data unless the same volume or host directory is mounted again.
Check that the mount is active
docker inspect redis --format '{{json .Mounts}}'
du -sh /opt/redis/dataStop and recreate a test container while retaining the mount, then run redis-cli ping and inspect the dataset. This validates the replacement procedure before production traffic depends on it.
Use a reviewed configuration file
Settings such as ACLs, memory limits, persistence behavior, and TLS belong in a reviewed redis.conf. Mount that file and tell Redis to load it:
mkdir -p /opt/redis
# Place your reviewed redis.conf at /opt/redis/redis.conf
docker run -d --name redis
-p 127.0.0.1:6379:6379
-v /opt/redis/data:/data
-v /opt/redis/redis.conf:/usr/local/etc/redis/redis.conf:ro
redis:<version> redis-server /usr/local/etc/redis/redis.confReview the permissions and mount mode before enabling configuration features that rewrite files. Redis documents that the mapped configuration directory must be writable in operating modes where Redis creates or rewrites configuration files. A read-only single-file mount is suitable only when the selected configuration and operating mode do not require those writes; otherwise mount a controlled writable directory and restrict who can modify it.
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Run the deployment with Compose
Compose keeps the image, command, mounts, restart policy, and health check in one version-controlled file. This small pattern uses a host directory for data and a reviewed configuration file:
services:
redis:
image: redis:<version>
restart: unless-stopped
command: ["redis-server", "/usr/local/etc/redis/redis.conf"]
volumes:
- /opt/redis/data:/data
- /opt/redis/redis.conf:/usr/local/etc/redis/redis.conf:ro
healthcheck:
test: ["CMD", "redis-cli", "ping"]
interval: 10s
timeout: 5s
retries: 5Save the file, then start it with the Compose implementation installed on your VPS:
docker compose up -d
docker compose ps
docker compose logs --tail 100 redisThe health check runs redis-cli ping inside the container. A healthy result means Redis answered that probe; it does not prove that your application can authenticate, reach the correct network, or execute its required commands.
Handle the startup race
Compose can start an application and Redis nearly simultaneously. Your application must retry its Redis connection with backoff rather than assuming that the first connection attempt will succeed. Use the health status as readiness information, but retain reconnect logic for restarts, network interruptions, and failovers.
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Bind only where clients need access
Publishing -p 6379:6379 without a host address listens on all host interfaces. For a local-only application, use:
-p 127.0.0.1:6379:6379If a separate private host must connect, bind to the VPS’s private address and allow only that source range in the provider security group and the Linux host firewall. Do not publish Redis directly to the public internet. Redis accepts powerful commands, so an exposed port creates a high-impact attack surface.
Confirm what is listening:
ss -ltnp | grep 6379Check the result after every networking change. A listener on 0.0.0.0:6379 or [::]:6379 is reachable on all corresponding interfaces; a listener on 127.0.0.1:6379 is local to the VPS.
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Align both firewall layers
- In the cloud or VPS provider security group, allow 6379 only from the application hosts that require it, or do not allow it at all for a local-only deployment.
- In the Linux firewall, apply the same source restriction. Avoid a broad allow rule that defeats the provider-level policy.
- Remove temporary testing rules when validation is complete.
- Keep SSH access restricted separately so firewall changes cannot lock you out.
Authentication does not replace network controls. A password sent with Redis AUTH is unencrypted unless the connection is protected with TLS.
Add authentication, ACLs, and TLS when appropriate
Use Redis ACLs to create named users with only the commands and key patterns each application needs. Store credentials outside source code and rotate them using your deployment secret mechanism. A single shared, all-powerful credential makes incident response and access review harder.
Use TLS when clients cross an untrusted network or when your security policy requires encryption and integrity protection. Redis supports TLS for client connections and other Redis communication channels. TLS adds processing overhead, so size CPU capacity and test latency with your actual client workload. Configure certificates, trusted authorities, and client verification in the reviewed Redis configuration, then require clients to use the TLS endpoint rather than silently falling back to plaintext.
For a game server and Redis on the same VPS, loopback binding may keep traffic inside the host while still leaving authentication and ACLs useful for defense in depth. For separate VPSs, private networking, firewall restrictions, ACLs, and TLS should be evaluated together rather than treating any one control as sufficient.
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Anyone who can control the Docker daemon can generally control containers and obtain powerful access to the host. Keep the daemon’s socket local, avoid exposing an unauthenticated Docker TCP endpoint, and use SSH or a TLS-secured client connection for remote administration when remote administration is unavoidable.
Limit membership in the local docker group. Membership grants powerful control over the Docker Engine and should be treated as administrative access. Review who can log in to the VPS, keep the operating system patched, and separate application deployment accounts from full host administration where practical.
Backups, monitoring, and recovery
Back up the mounted data
Include the directory or volume mounted at /data in snapshots or backups. A backup that cannot be restored is not a recovery plan, so restore it to a separate container or VPS and verify that the application can read the expected keys. Test after changing Redis versions, persistence settings, storage layout, or backup tooling.
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Watch the failure signals
- Disk usage for the filesystem holding
/data. - Memory pressure and the host’s available RAM.
- Container restart counts and repeated exit loops.
- Health-check failures and application reconnect rates.
- Backup completion and restore-test results.
Set memory limits and an eviction policy deliberately for your workload. A limit that is too low causes evictions or failures; a limit that is too high can push the VPS into memory pressure and affect every service on it.
Troubleshoot common problems
The container exits immediately
Inspect the logs first:
docker logs redisTypical causes are an invalid configuration path, a syntax error in redis.conf, an unreadable mounted file, or another process already occupying the published port. Correct the cause, remove the failed container if necessary, and recreate it with the same persistent mount.
Port 6379 is already in use
Find the listener:
ss -ltnp | grep 6379Stop or reconfigure the conflicting service, or publish Redis on a different host port while retaining container port 6379. Update the application connection settings to match the host port.
The application cannot connect
- For a same-host application, use
127.0.0.1when Redis is bound to loopback. - For another host, verify the VPS private address, provider security group, host firewall, and container publication together.
- Check that the application uses the correct credentials and TLS mode.
- Run
docker exec -it redis redis-cli pingto separate a Redis process problem from a network or client configuration problem.
Data disappeared after recreation
Inspect the container mounts and confirm that the replacement used the original host directory or named volume. If the old container stored data only in its writable layer, that data was never protected against removal. Recover from the most recent verified backup or snapshot.
The health check fails while Redis appears running
Run the exact probe manually:
docker exec -it redis redis-cli pingIf authentication or TLS is required, the bare probe may no longer represent a valid application request. Adjust the health check to authenticate and use the required transport, while keeping the probe lightweight. Also check startup logs and allow enough startup time for the configured retry count.
When a managed Redis service is a better fit
Docker on a VPS gives you direct control, but you own upgrades, backups, restore tests, firewall policy, TLS configuration, monitoring, scaling, and failure recovery. Before choosing a managed service instead, compare operational responsibility, backup and restore automation, network isolation, TLS and identity features, scaling and failover, total cost, and provider support. The mechanics documented here establish how to operate the container; they do not establish current managed-service prices or service-level guarantees.
Quick Recap
Production readiness checklist
- Use an explicit, tested Redis image version instead of an implicit mutable tag.
- Mount persistent storage at
/dataand include it in snapshots or backups. - Verify backups by restoring them to an isolated Redis instance.
- Bind port 6379 to loopback or a private interface, never broadly by default.
- Align provider security-group rules with the Linux host firewall.
- Configure ACLs or authentication and protect credentials.
- Use TLS whenever traffic crosses a network you do not fully trust.
- Add a Compose health check and application reconnect logic.
- Protect the Docker daemon and restrict access to the Docker socket and
dockergroup. - Monitor disk space, memory pressure, restart loops, health failures, and backup success.
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