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Documentation

MinIO Object Storage for Linux

mc ready

Syntax

The mc ready command checks the status of a cluster and whether the cluster has read and write quorum.

The following sends a GET request to the cluster at alias myminio and returns its status.

mc ready myminio

The command sends a GET request to the deployment at the alias myminio.’ The command repeats the request until it is successful.

The output before the cluster at alias myminio is ready resembles the following:

The cluster `myminio` is unreachable: Get "http://myminio.example.com:9000/minio/health/cluster": dial tcp 198.51.100.0:9000: connect: connection refused

Once the request succeeds in connecting to the myminio deployment, the output resembles the following:

The cluster `myminio` is ready

The command has the following syntax:

mc [GLOBALFLAGS] ready            \
                 TARGET           \
                 [--cluster-read] \
                 [--maintenance]

  • Brackets [] indicate optional parameters.

  • Parameters sharing a line are mutually dependent.

  • Parameters separated using the pipe | operator are mutually exclusive.

Copy the example to a text editor and modify as-needed before running the command in the terminal/shell.

Parameters

TARGET
Required

The full path to the alias or prefix where the command should run.

--cluster-read
Optional

Checks if the cluster has enough quorum to serve READ requests.

--maintenance
Optional

Checks if the cluster can maintain read and write quorum if the node for the alias is taken down for maintenance.

Use an alias for the specific node you expect to take down for maintenance and not an alias set to a load balancer.

Global Flags

This command supports any of the global flags.

Examples

Check if the cluster has read quorum

The following command checks that a deployment has sufficient drives available for read operations.

mc read myminio --cluster-read

Check if a cluster is down for maintenance

The following command checks whether the cluster can maintain read and write quorum during maintenance when the node at alias myminio is taken down.

mc ready myminio --maintenance
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