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Run Consul KV by starting a Consul server agent in Docker, not by launching a separate key-value container. Persist its state by mounting durable storage at /consul/data, publish only the client ports you need, and use the HTTP API or Consul CLI for key operations. On a public VPS, add firewall rules, TLS, ACLs, and gossip encryption before permitting remote clients.
What Consul KV is and what Docker must run
Consul KV is the key-value store built into a Consul agent. The agent participates in Consul’s server or client architecture; there is no standalone “KV server” image to deploy. For a small VPS, you normally run one Consul server container, enable its HTTP interface, and send requests to the server’s KV API.
The server keeps its Raft state, catalog information, sessions, and other durable data in its data directory. A container’s writable layer is temporary: removing and recreating the container can remove anything that was not mounted from the host or a Docker volume. Mount the persistent store at /consul/data and point the agent’s -data-dir flag to that path.
HashiCorp’s Docker deployment guide explicitly distinguishes the configuration directory from the state directory: /consul/config is for startup configuration files, while “the configuration directory is not exposed as a volume and does not persist data.” See HashiCorp’s Docker server-agent documentation. Treat configuration and state as separate concerns.
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Choose a topology before creating the container
A single server is the shortest path to a working KV store, but it has a single failure domain. A multi-server cluster improves availability through quorum and is more appropriate when an outage would affect several applications. The following differences matter when you plan a VPS deployment.
| Consideration | Single Consul server | Multi-server cluster |
|---|---|---|
| Persistence and recovery | One durable data directory and one backup stream; recovery depends on that VPS and its snapshots. | Each server needs its own durable data directory. Replicated state continues when one server is lost, but backups are still required. |
| Quorum and availability | No quorum configuration; the server is unavailable if its host or process is down. | Servers elect a leader and require a quorum. Three servers are a common small-cluster starting point. |
| Network exposure | Expose the HTTP API only to trusted clients; expose DNS only if you use it. | In addition to client traffic, allow the server-to-server gossip and RPC traffic required by the chosen Consul configuration. |
| Operational cost | Lowest CPU, memory, storage, and administration overhead. | More VPS instances, addresses, monitoring, upgrades, and failure scenarios to manage. |
| Backup strategy | Protect the one server’s data and test restoration. | Take consistent snapshots and retain copies independently of every server. |
| Upgrade complexity | Short maintenance interruption is possible during a replacement or upgrade. | Upgrade servers in a controlled sequence while preserving quorum and leader availability. |
The rest of this walkthrough creates a single server. A later section shows the settings that change when you expand to three servers.
Prepare the Linux VPS
Install Docker using your distribution’s supported method
Install Docker Engine and its Compose or command-line components from the package source supported by your Linux distribution. Confirm that the daemon is running and that your administrative account can execute Docker commands, either directly or through the docker group. Keep the host patched and use a non-root administrative account with narrowly scoped sudo access.
Provide durable, lock-capable storage
Consul’s agent reference states that -data-dir is required for every agent, must survive reboots, and must support filesystem locking. A local filesystem on the VPS is normally suitable; avoid an ephemeral container layer or a network filesystem whose locking behavior you have not verified.
You can use a named Docker volume, which is convenient for a single host:
docker volume create consul-dataAlternatively, create a host bind-mount directory when you want host-level backup tools, disk quotas, or explicit permissions:
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sudo chown root:root /srv/consul/dataThe process inside the official image must be able to read and write the mounted directory. If startup logs report permission errors, inspect the image’s user and group IDs and adjust ownership or permissions deliberately; do not solve the problem by making the directory world-writable. The data directory can contain sensitive state and, depending on the deployment, ACL tokens, so restrict read access on the host.
Plan the firewall first
Decide which networks will call Consul. Port 8500 carries the HTTP API and web UI. Port 8600 carries Consul DNS over UDP and, when a client requires it, TCP. A single-node installation does not need you to expose every Consul port to the internet. Put the VPS behind a cloud security group and a host firewall, and allow the API only from trusted application networks or an authenticated reverse proxy.
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Start a single Consul server container
The following is a documented single-server pattern. It publishes the HTTP API/UI and Consul DNS over UDP, mounts a named volume at the state directory, and configures a one-server bootstrap.
docker run --name consul-server -d
-p 8500:8500
-p 8600:8600/udp
-v consul-data:/consul/data
hashicorp/consul consul agent
-server -ui -node=server-1
-bootstrap-expect=1
-client=0.0.0.0
-data-dir=/consul/dataThis command follows the official Docker example. The image name is followed by the command executed inside the container: consul agent. The important flags are:
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For a bind mount, replace the volume option with -v /srv/consul/data:/consul/data. Pin the image to an approved Consul release tag for repeatable deployments instead of using latest; choose the exact tag from the current HashiCorp release documentation and record it with your infrastructure configuration.
If you do not need Consul DNS, omit the -p 8600:8600/udp mapping. If clients use DNS over TCP, publish that protocol separately with -p 8600:8600/tcp and permit it in the firewall.
Verify that the agent is healthy
Check the container state and read its startup log before sending application traffic:
docker ps
docker logs consul-serverA running container is not enough; Consul must elect a leader and join the expected cluster. Inspect membership from inside the container, as shown in the Docker documentation:
docker exec consul-server consul membersFor a one-server cluster, the member list should include server-1 and show it as alive. Query the leader endpoint from the VPS:
curl -fsS http://127.0.0.1:8500/v1/status/leaderA successful response is a quoted address and port for the elected leader. An empty response means no leader has been elected yet; inspect the logs, the bootstrap count, and the data-directory permissions before proceeding.
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Put, read, and delete KV values
Write or update a key with the HTTP API
The KV API uses the key path under /v1/kv/. PUT creates a new key or replaces its value. This example stores the text production at app/environment:
curl --request PUT --data 'production'
http://127.0.0.1:8500/v1/kv/app/environmentThe API normally returns a JSON boolean such as true when the write succeeds. Keys containing reserved URL characters should be URL-encoded rather than copied literally into a path. Keep values below the documented 512 KB maximum: “Values in the KV store cannot be larger than 512kb,” according to the KV Store HTTP API documentation.
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Read metadata or the raw value
A normal GET returns a JSON array containing metadata. The value is base64-encoded in the Value field:
curl http://127.0.0.1:8500/v1/kv/app/environmentFor scripts that need only the stored bytes, append the raw query parameter:
curl 'http://127.0.0.1:8500/v1/kv/app/environment?raw'The raw form is convenient for a configuration file or a shell variable. Treat binary and multiline data carefully, and do not log secrets returned by either form.
Delete a key
Delete the key with an HTTP DELETE request:
curl --request DELETE
http://127.0.0.1:8500/v1/kv/app/environmentDeleting a prefix requires the API’s recursive option; use it only after confirming the path, because all matching keys are removed.
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Use the Consul CLI instead
The official image includes the Consul binary, so the equivalent operations can be run with docker exec:
| Operation | Command |
|---|---|
| Write | docker exec consul-server consul kv put app/environment production |
| Read | docker exec consul-server consul kv get app/environment |
| Delete | docker exec consul-server consul kv delete app/environment |
When ACLs are enabled, supply an appropriate token through the CLI’s supported token option or environment variable. Do not place a management token in a shell history file, image layer, or publicly readable script.
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Keep data after restarts and back it up
Test persistence immediately after the first write. Stop and remove only the container, recreate it with the same mounted volume and data-directory setting, and confirm that app/environment is still present. Do not run docker volume rm consul-data as part of ordinary container cleanup; that command destroys the named volume.
A volume protects against container replacement but not against disk failure, operator error, ransomware, or a corrupted filesystem. Back up Consul using a tested snapshot procedure appropriate to your Consul edition and deployment. HashiCorp’s Docker guidance points to snapshot tooling for automated backups; see the Consul Docker documentation. Store backup copies outside the VPS, protect them as secrets, and perform restoration drills on an isolated test instance.
The agent reference describes -data-dir as required persistent storage and notes that server state and potentially ACL tokens reside there. Read the agent command reference before changing disks, filesystem permissions, or backup schedules. Back up configuration files separately if you mount them into /consul/config; those files do not substitute for a data-directory backup.
Secure Consul on a public VPS
Restrict network access
- Allow TCP 8500 only from application subnets, a VPN, or a reverse proxy that authenticates users. Do not expose the UI and API to the entire internet by default.
- Open UDP 8600 only when clients perform Consul DNS lookups. Add TCP 8600 when the workload uses DNS over TCP; DNS clients can fall back to TCP for large responses or truncated UDP responses.
- Keep server-to-server and gossip traffic on private interfaces or a private network when you build a cluster. Do not assume that publishing one client port is sufficient or that publishing every port is safe.
Enable TLS for the HTTP API
Configure Consul’s HTTPS listener and certificates according to the release you deploy, or terminate TLS at a carefully configured reverse proxy that forwards only authenticated requests. Redirect or block plaintext HTTP from untrusted networks. Verify certificate rotation and make sure internal clients trust the issuing certificate authority.
Use ACLs with least privilege
Unauthenticated access is not an acceptable default for a public VPS. Define ACL policies for the paths each application needs. The KV API associates key:read with reads and key:write with writes and deletes. Give a read-only service only key:read on its required prefix; reserve write and management tokens for deployment automation and operators. Protect the bootstrap and replication tokens in a secret manager and on the host filesystem.
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Encrypt gossip traffic
Generate a gossip encryption key with consul keygen and configure the same key on every member of a cluster. The agent documentation describes gossip encryption and the requirement that all nodes share the same key. Rotate it using a planned procedure so that old and new members overlap during the transition; never paste it into a public issue, image, or command transcript.
Do not copy the example’s broad bind blindly
The sample uses -client=0.0.0.0 because a containerized client interface must be reachable through Docker networking. That flag binds the interface on all container addresses; it does not provide authentication, encryption, or firewalling. Combine it with restricted port publishing, TLS, ACLs, and host-level filtering before remote access is enabled.
Use Consul DNS only when you need it
Consul’s DNS service listens on port 8600, while the HTTP API and UI use port 8500. Publishing 8600/udp is unnecessary if every application reads KV values over HTTP or the CLI. If service discovery clients query DNS, publish UDP 8600 and evaluate whether they also require TCP 8600. Permit those protocols only from the networks that run the clients, and document the resolver address and search behavior in the application configuration.
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Expand to a multi-server cluster
A production cluster normally uses multiple server containers on a shared private Docker network or equivalent private connectivity. Give every server a unique node name and its own durable data directory. Configure each server with the same -bootstrap-expect value; the agent waits for that number of servers before bootstrapping, so inconsistent values can prevent a healthy cluster from forming.
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-serverand-bootstrap-expect=3on all three containers. - Assign unique names such as
server-1,server-2, andserver-3. - Give each container a separate durable mount, for example
/srv/consul/server-1, rather than sharing one data directory among servers. - Set
-retry-jointo reachable addresses or DNS names for the other servers so a replacement can find the cluster. - Advertise addresses that the other containers can actually route to; a loopback address inside one container is not a cluster address.
- Keep gossip encryption, TLS trust, ACL configuration, and Consul version policy consistent across members.
HashiCorp’s current Docker example demonstrates three servers with -bootstrap-expect=3; compare the exact network and port settings with that deployment guide before implementing them. Do not bootstrap a second independent cluster against an existing data directory, and do not change the expected server count casually after a cluster has formed.
Troubleshoot common failures
The container exits immediately
Run docker logs consul-server. Syntax errors, an invalid flag, a missing data directory, or a permissions failure will normally be reported there. Confirm that the image tag matches the flags in your configuration and that the mounted path is writable by the process.
The leader endpoint is empty
Check consul members, the server count, and the -bootstrap-expect value. A single server should use -bootstrap-expect=1; a three-server cluster should use 3 on every server and have working private connectivity. Firewall rules that block gossip or server RPC traffic can leave members alive but unable to elect a leader.
HTTP requests are refused
Verify that the container is running, port 8500 is published, and the request targets the correct address. From the VPS, test 127.0.0.1:8500 first. From another host, test the VPS address only after checking the security group, host firewall, TLS scheme, and reverse-proxy route. A binding on the container does not override a blocked host port.
Keys disappear after recreation
Inspect docker inspect consul-server and confirm that the volume or bind mount is attached to /consul/data. If the container was started without that mount, its writable layer held the state. Recreate the container with the original volume; do not delete the volume while investigating.
A request returns an ACL error
Supply a valid token and check that its policy grants the requested prefix and operation. Reads need key:read; writes and deletes need key:write. Also verify that the client is reaching the intended datacenter and HTTPS endpoint rather than an unconfigured local listener.
Remote access works without authentication
Treat this as an incident, not a convenience. Restrict port 8500 immediately, rotate exposed tokens, enable TLS and ACLs, and review logs for unauthorized reads or writes. The -client=0.0.0.0 setting is not an access-control mechanism.
Operational checklist
- Consul is running as a server agent, with a stable unique node name.
/consul/datais backed by a durable host path or named volume that supports locking.- The image tag is pinned to an approved release rather than
latest. - Only the required API and DNS protocols are published and firewalled.
- Leader status and membership are checked after startup and after every restart.
- KV writes, reads, raw reads, and deletes are tested with both API and CLI methods used by your applications.
- Snapshots are automated, stored off-host, and periodically restored in a test environment.
- TLS, ACL policies, gossip encryption, and token storage are configured before public exposure.
- Cluster members use unique names, private join addresses, matching bootstrap expectations, and separate durable data directories.
With those controls in place, Docker supplies the process lifecycle while Consul supplies the KV API and replicated agent state. The durable data mount, narrowly exposed ports, and authenticated encrypted interfaces are the boundaries that turn the quick single-server example into a maintainable VPS deployment.
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