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There is no single wait time that proves a server is ready. Wait for the milestone your next task actually needs: access to a login prompt, completed cloud initialization, configured network connectivity, or a healthy application. Those are separate conditions, and none automatically proves the next one.
What does “ready” mean for your next task?
A server can reach a login prompt or accept network connections while setup continues. Cloud-init’s later boot stage may still run package installation, configuration-management tools, and user scripts. Likewise, cloud-init finishing does not establish that an independently managed application is healthy. Choose a signal that matches the work you intend to do.
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- Need administrative access? Confirm that the expected login method works, such as an authenticated SSH connection.
- Need instance setup to finish? Wait for cloud-init completion.
- Need network configuration? Check the configured network-online condition, if the service actually depends on it.
- Need an application? Wait for an application-level readiness signal, not merely a running process or open machine.
These milestones answer different questions; a successful check for one should not be treated as proof of another.
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From an external script or operator task
Run cloud-init status --wait. According to the cloud-init documentation, the command exits after cloud-init completes. That confirms cloud-init completion, not application health or the availability of a remote dependency.
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From a systemd service
When a service depends on cloud-init’s work, cloud-init documents ordering it after the relevant targets, for example:
[Unit]
After=cloud-init.target multi-user.targetAn ordering relation specifies when the unit may run relative to those targets; it does not define whether the application is healthy. Check the installed distribution and cloud platform’s configuration, since unit behavior can vary.
Do not make cloud-init wait for itself from a boot command that cloud-init must finish. The cloud-init troubleshooting guidance identifies this circular wait as a possible deadlock.
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When should a service wait for the network?
network.target and network-online.target have different roles. The systemd project describes network.target as passive; it is often useful for ordering a service’s shutdown relative to networking. network-online.target actively waits according to the configured network manager’s definition of “up,” often a configured routable address.
Use the online target only when the service needs network configuration before doing its work. Its actual behavior depends on which wait-online service is enabled and how networking is configured. It can delay startup, and it does not prove that a particular remote host or application responds. See the systemd network-online explanation and verify the relevant configuration on the server.
How can you tell an application is ready?
A service process starting is not necessarily the same as its initialization finishing. With systemd’s Type=notify, a service that supports the protocol signals readiness by sending READY=1; dependent units can then proceed. This only works when the application implements systemd notifications. The systemd project documents the service types and notification behavior in its service unit documentation.
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If the service does not support that protocol, use a check tied to the application’s actual contract—for example, an HTTP health endpoint where the application provides one. Bound the wait with a timeout and report what failed. A network address or cloud-init completion alone is not an application health check.
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| Method | What it establishes | Useful for | Important limit |
|---|---|---|---|
cloud-init status --wait |
Cloud-init completion | External automation waiting for instance initialization | Does not establish application health; can deadlock if invoked from work cloud-init must finish. |
After=cloud-init.target |
Ordering after the cloud-init target | A systemd unit dependent on cloud-init stage ordering | Does not define application health. |
network-online.target |
The configured network manager’s online condition | Startup that requires configured network connectivity | Meaning varies with implementation and configuration; it does not verify a particular remote endpoint. |
systemd Type=notify |
Application-declared readiness after READY=1 |
A service that implements systemd notifications | Requires application support. |
| Console, journal, and systemd job inspection | Diagnostic evidence about boot progress | Troubleshooting a machine that appears stuck | Not a general success signal for automation. |
What should you check if boot appears stuck?
On a system using systemd, first check failed units, pending jobs, boot logs, and cloud-init’s status. The systemd troubleshooting page explains that running jobs must finish before dependent waiting jobs can start, and recommends checking the boot journal.
- Check failed units with
systemctl --failed. - Review outstanding jobs with
systemctl list-jobs; for cloud-init investigations, also usesystemctl list-jobs --after. - Review the boot journal with
journalctl -b. - For cloud-init, inspect its extended status with
cloud-init status --longand review/var/log/cloud-init.logand/var/log/cloud-init-output.log. - If a job remains blocked, inspect the relevant service and its child processes. Look for a failed dependency, a slow or stuck service, an external tool, a kernel or driver problem, or a command in boot configuration that never returns.
The systemd boot troubleshooting guide says: “If the boot stops without presenting you with a login on any virtual console, let it retry for up to 5 minutes before declaring it definitely stuck.” This is advice for the specific symptom of no login prompt on any virtual console, not a normal boot-time estimate or a universal timeout for cloud instances. The cloud-init troubleshooting guide provides the cloud-init-specific checks.
Is there a normal server boot time?
The official documentation cited here does not establish a typical or average server boot duration. Timing depends on the machine, configuration, and work performed during startup, so a generic number would not tell you reliably when your own server is ready. Use the relevant readiness condition and investigate the blocking job or service if progress stops.
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