The Tool Desk
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What Consul does on a VPS
Consul is downloadable infrastructure software that provides service discovery, health-aware cataloging, key/value data, and agent-to-agent membership. Each node runs an agent. The agent can be a server, a client, or (for a small lab) the only server in a datacenter.
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Server and client roles
| Role | What it does | Typical VPS use |
|---|---|---|
| Server | Stores catalog and other cluster state, participates in Raft consensus, and answers control-plane requests. | A dedicated control-plane VPS or a lab node. |
| Client | Joins the server cluster and provides a local agent for workloads, registrations, health checks, and queries. | An application VPS that should not carry server-state overhead. |
A single server is useful for learning and a disposable lab. A production datacenter needs multiple server agents, explicit peer joining, and a failure-domain plan so that a host failure does not remove quorum. Do not choose a server count by copying a generic VPS size recommendation: CPU, memory, storage, and throughput depend on catalog size, check frequency, query volume, and the rest of the workload.
Plan the network before installing
Consul has separate addresses for cluster traffic and local application/API traffic. The client_addr setting defaults to localhost, which is a safe starting point but prevents remote clients from reaching the HTTP API or DNS listener. The bind_addr is the address used for node-to-node communication and must be reachable by every participating agent.
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Bind only the interfaces your design needs. Never expose an unauthenticated HTTP/API listener to the public internet. Put Consul nodes on a private network or firewall their source addresses, then add ACLs and, where appropriate, TLS.
| Interface or port | Purpose | Firewall guidance |
|---|---|---|
| SSH (usually TCP 22) | Administration of the VPS. | Allow only your administration sources. |
| LAN Serf (default TCP/UDP 8301) | Membership and failure detection between agents in one datacenter. | Allow between Consul nodes only. |
| RPC (default TCP 8300) | Server RPC and agent control-plane traffic. | Restrict to the Consul topology. |
| WAN Serf (default TCP/UDP 8302) | Federation between datacenters when you use it. | Open only between intended datacenters. |
| DNS (default TCP/UDP 8600) | Service-discovery queries. | Allow only approved resolvers and workloads. |
| HTTP API (default TCP 8500), HTTPS API (8501), and gRPC (8502 where enabled) | API, UI, and protocol access, depending on enabled features. | Keep private; expose through a controlled proxy only when necessary. |
These are default ports, not a universal allow-list. The exact set changes with Consul version, TLS, DNS forwarding, WAN federation, and your topology. Match the agent reference for your installed version before changing a public firewall.
Prepare the Linux VPS
Use a dedicated identity and stable naming
Use a currently supported Linux distribution, a dedicated unprivileged consul user and group, and a data directory that only that account can write. Give each node a stable, unique hostname and set an explicit node_name. Synchronize clocks with the distribution’s time service; reliable timestamps matter when you investigate membership, elections, and health checks.
sudo useradd --system --home /var/lib/consul --shell /usr/sbin/nologin consul
sudo install -o consul -g consul -m 0750 -d /etc/consul.d /var/lib/consulApply your firewall policy before joining a cluster. Permit SSH from your administration network, then permit only the Consul ports and source ranges required by the design. Do not assume a cloud-provider security group replaces the VPS’s host firewall; enforce both where available.
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Install and verify Consul
HashiCorp recommends the precompiled Linux binary. Download the package matching the VPS architecture from the official distribution channel, verify its published checksum or signature where provided, and install the binary on the system PATH. A distribution package manager or a source build is also possible, but mixing package-manager and manually installed binaries makes upgrades harder to audit.
sudo install -m 0755 consul /usr/local/bin/consul
consul version
The version command should succeed as the same account that will be used by systemd. Record the version so configuration and troubleshooting are matched to that release. Keep the downloaded archive and verification material outside the data directory; the data directory is for agent state, not an upgrade cache.
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Store configuration files in /etc/consul.d. The following is a deliberately small server configuration for a first lab node. Replace addresses and names with values from your network; do not copy the private address blindly.
datacenter = "dc1"
node_name = "consul-1"
data_dir = "/var/lib/consul"
server = true
bind_addr = "10.0.0.10"
client_addr = "127.0.0.1"
bootstrap_expect = 1
ui_config {
enabled = true
}
bootstrap_expect = 1 is appropriate only for a one-server lab. For a new multi-server datacenter, use the same expected server count on each initial server while the cluster forms, and set retry_join on nodes that must find existing peers. A joining client normally sets server = false and uses the same datacenter and a reachable bind_addr, for example:
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datacenter = "dc1"
node_name = "app-1"
data_dir = "/var/lib/consul"
server = false
bind_addr = "10.0.0.21"
client_addr = "127.0.0.1"
retry_join = ["10.0.0.10", "10.0.0.11", "10.0.0.12"]
For cloud or dynamically addressed hosts, use the documented retry-join provider syntax for your environment rather than hard-coding an address that can change. During initial formation, keep datacenter names, encryption settings, and bootstrap expectations consistent. After the server cluster has formed, remove bootstrap_expect from the persistent configuration so a restart cannot accidentally attempt to form a new cluster.
Run the agent with systemd
A service unit should run Consul as the dedicated user, load every file in the configuration directory, restart after a failure, and send output to the journal. Create /etc/systemd/system/consul.service:
[Unit]
Description=Consul agent
Documentation=man:consul
Wants=network-online.target
After=network-online.target
[Service]
User=consul
Group=consul
ExecStart=/usr/local/bin/consul agent -config-dir=/etc/consul.d
ExecReload=/bin/kill -HUP $MAINPID
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
Enable and start it, then inspect the journal:
sudo systemctl daemon-reload
sudo systemctl enable --now consul
sudo systemctl status consul
sudo journalctl -u consul -e
When you use Consul’s join-readiness notifications, HashiCorp documents a Type=notify unit together with join or retry_join. Add that behavior only when it matches the Consul version and service workflow you have chosen; an incorrect notification type can make systemd report a healthy process as failed or vice versa.
Validate membership before onboarding applications
Check the local agent first. Run these commands as an account that can reach the configured API:
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consul members
consul info
curl --fail http://127.0.0.1:8500/v1/agent/self
consul members: confirms that the expected nodes are alive and shows their roles and addresses.consul info: exposes agent, runtime, raft, and protocol information useful for diagnosing a formation problem.- The local API request: verifies that the HTTP listener is responding without requiring you to expose it externally.
For a multi-server datacenter, verify every intended peer appears and that Raft has elected a leader. If a node remains failed or left, check the bind address, firewall rules, security-group rules, hostname resolution, and clock synchronization before registering services. A successful systemd start alone does not prove that the node joined the correct datacenter.
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Enable ACLs on every server and client agent, not just the node where you run the bootstrap command. A typical configuration starts with deny-by-default and token persistence:
acl {
enabled = true
default_policy = "deny"
enable_token_persistence = true
}
Roll this out carefully: agents need an agent token, and applications need service-specific tokens. On a server after ACLs are enabled, bootstrap the initial management token once:
consul acl bootstrapSave the returned SecretID in a password manager or another protected secret store immediately. It is a high-privilege credential; do not commit it to configuration management, shell history, tickets, or application source. If you lose it, follow the recovery procedure for your Consul release rather than repeatedly bootstrapping.
Create policies that grant only the catalog, service, node, key/value, or operator capabilities a particular workload needs. Generate separate tokens for each agent and service, place the agent token in the agent’s ACL token configuration, and rotate tokens as part of normal secret management. Move from permissive development policies to deny-by-default in stages so that every denied request can be mapped to an intentional policy change.
ACLs control authorization; they do not encrypt traffic. Use TLS and network restrictions for API, RPC, DNS, and agent-to-agent paths where your threat model requires confidentiality or peer authentication. Keep the HTTP/API and UI listeners private even after ACLs are enabled.
Register and discover a first service
Register with HCL
Place a service definition in the agent’s configuration directory and reload the agent. This example registers a local web service and checks it over HTTP:
service {
name = "web"
id = "web-app-1"
port = 8080
check {
id = "web-http"
name = "web HTTP"
http = "http://127.0.0.1:8080/health"
interval = "10s"
timeout = "2s"
}
}
Use an explicit address when the service is not reachable at the agent’s node address. The health endpoint should represent application readiness, not merely that a process exists. After adding the file, reload or restart the agent according to your deployment policy and inspect the catalog.
Register through the API
Automation can call the agent’s registration endpoint instead of writing a file. Protect that request with the appropriate ACL token and send the same essentials: service name, unique ID, reachable address and port, tags or metadata where needed, and a health check. File-based registration is easy to review in configuration management; API registration is useful for ephemeral workloads. Do not use both for the same service ID unless you also define how deregistration is handled.
Query only healthy instances
Consul DNS and the catalog can answer discovery queries. A DNS query such as web.service.consul returns service records according to the agent’s DNS configuration; catalog and health APIs provide richer metadata. Confirm that an intentionally failing check removes the instance from normal healthy results, then restore the endpoint and verify that it returns. This test catches incorrect check addresses and firewall rules before another application depends on discovery.
Quick Recap
Lab VPS versus production cluster
| Decision | Single-node lab | Production datacenter |
|---|---|---|
| Agent role | One server can provide all control-plane functions. | Several servers provide quorum; application VPSs generally run clients. |
| Formation | Simple local start; bootstrap_expect = 1 can be used initially. |
Explicit peer addresses or retry-join automation, with a planned failure domain. |
| Network exposure | Keep client/API access on localhost unless testing remote access. | Reachable cluster interfaces are private and firewall-scoped; API, DNS, and RPC exposure is deliberate. |
| Recovery | Rebuilding the node may be acceptable for disposable data. | Protect server data, test snapshots and restore procedures, and monitor Raft leadership and membership. |
| Security | ACLs may be introduced while learning, but unauthenticated exposure is still unsafe. | ACLs on all agents, individual least-privilege tokens, TLS where required, and controlled secret rotation. |
Troubleshooting the common failures
- “No route” or a node never joins: confirm that
bind_addris the VPS’s reachable private address, that TCP and UDP LAN membership traffic is permitted, and that the peer is using the same datacenter and encryption settings. - Peers appear but no leader is elected: inspect server count, duplicate node names, Raft messages in
consul info, and whether a firewall blocks RPC traffic. Do not add random servers to force quorum. - Remote API or DNS queries fail: remember that
client_addr = "127.0.0.1"intentionally limits access. Change it only to a private interface, then update firewall rules and ACLs together. - systemd loops on restart: read
journalctl -u consulfor permission errors, malformed HCL, a locked data directory, or an invalid address. Ensure/var/lib/consulbelongs to the service user. - Service is registered but never healthy: test the exact check URL from the Consul agent’s network namespace, confirm the service is listening on the advertised address and port, and check that local firewall rules allow the probe.
- ACL errors after enabling security: install an agent token on every client and server, use a service token rather than the bootstrap token for applications, and verify the token’s policy grants the requested operation.
A safe first-day checklist
- Confirm supported Linux, stable hostnames, synchronized time, a dedicated user, and protected data/configuration directories.
- Install and verify the architecture-matched binary, then record its version.
- Choose server or client deliberately; do not put application-only VPSs in server mode by default.
- Set
bind_addr,client_addr, datacenter, node name, and the appropriate formation or join settings. - Open only required firewall paths and keep the API private.
- Start systemd, inspect logs, run
consul membersandconsul info, and verify a Raft leader when applicable. - Remove
bootstrap_expectafter initial server formation. - Enable ACLs across the datacenter, bootstrap once, protect the management token, and create individual agent and service tokens.
- Register one service with a meaningful health check, query it through DNS or the catalog, and test that unhealthy instances are excluded.
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