cockroach node - CockroachDB

To view details for each node in the cluster, use the cockroach node with the appropriate subcommands and flags. The cockroach node command is also used to stop or remove nodes from the cluster. For details, see .

Subcommands

Subcommand	Usage
`ls`	List the ID of each node in the cluster, excluding those that have been decommissioned and are offline.
`status`	View the status of one or all nodes, excluding nodes that have been decommissioned and taken offline. Depending on flags used, this can include details about range/replicas, disk usage, and decommissioning progress.
`decommission`	Decommission nodes for removal from the cluster. For more information, see Decommission nodes.
`recommission`	Recommission nodes that are decommissioning. If the decommissioning node has already reached the , you may need to restart the node after it is recommissioned. For details, see .
`drain`	Drain nodes in preparation for process termination. Draining always occurs when sending a termination signal or decommissioning a node. The `drain` subcommand is used to drain nodes without also decommissioning or shutting them down. For details, see .

Synopsis

List the IDs of active and inactive nodes:

$ cockroach node ls <flags>

Show status details for active and inactive nodes:

$ cockroach node status <flags>

Show status and range/replica details for active and inactive nodes:

$ cockroach node status --ranges <flags>

Show status and disk usage details for active and inactive nodes:

$ cockroach node status --stats <flags>

Show status and decommissioning details for active and inactive nodes:

$ cockroach node status --decommission <flags>

Show complete status details for active and inactive nodes:

$ cockroach node status --all <flags>

Show status details for a specific node:

$ cockroach node status <node ID> <flags>

Decommission nodes:

$ cockroach node decommission <node IDs> <flags>

Recommission nodes:

$ cockroach node recommission <node IDs> <flags>

Drain nodes:

$ cockroach node drain <node ID> <flags>

View help:

$ cockroach node --help

$ cockroach node <subcommand> --help

Flags

All node subcommands support the following general-use and logging flags.

General

Flag	Description
	`--format`	How to display table rows printed to the standard output. Possible values: `tsv`, `csv`, `table`, `records`, `sql`, `html`. Default:`tsv`

The node ls subcommand also supports the following general flags:

Flag	Description
`--timeout`	Set the duration of time that the subcommand is allowed to run before it returns an error and prints partial information. The timeout is specified with a suffix of `s` for seconds, `m` for minutes, and `h` for hours. If this flag is not set, the subcommand may hang.

The node status subcommand also supports the following general flags:

Flag	Description
`--all`	Show all node details.
`--decommission`	Show node decommissioning details.
`--ranges`	Show node details for ranges and replicas.
`--stats`	Show node disk usage details.
`--timeout`	Set the duration of time that the subcommand is allowed to run before it returns an error and prints partial information. The timeout is specified with a suffix of `s` for seconds, `m` for minutes, and `h` for hours. If this flag is not set, the subcommand may hang.

The node decommission subcommand also supports the following general flags. For more information, see cockroach node decommission --help.

Flag	Description
	`--checks`	Whether to perform a set of “decommissioning pre-flight checks”. Possible values: `enabled`, `strict`, or `skip`. If `enabled`, CockroachDB will check if a node can successfully complete decommissioning given the current state of the cluster. If errors are detected that would result in the inability to complete node decommissioning, they will be printed to `STDERR` and the command will exit without attempting to perform node decommissioning. For more information, see . Default:`enabled`
`--dry-run`	Performs the same decommissioning checks as the `--checks` flag, but without attempting to decommission the node. When `cockroach node decommission {nodeID} --dry-run` is executed, it runs the checks, prints the status of those checks, and exits.
`--wait`	When to return to the client. Possible values: `all`, `none`. If `all`, the command returns to the client only after all replicas on all specified nodes have been transferred to other nodes. If any specified nodes are offline, the command will not return to the client until those nodes are back online. If `none`, the command does not wait for the decommissioning process to complete; it returns to the client after starting the decommissioning process on all specified nodes that are online. Any specified nodes that are offline will automatically be marked as decommissioning; if they come back online, the cluster will recognize this status and will not rebalance data to the nodes. Default:`all`
`--self`	Deprecated. Instead, specify a node ID explicitly in addition to the `--host` flag.

The node drain subcommand also supports the following general flags:

Flag	Description
`--drain-wait`	Amount of time to wait for the node to drain before returning to the client. If draining fails to complete within this duration, you must re-initiate the command to continue the drain. A very long drain may indicate an anomaly, and you should manually inspect the server to determine what blocks the drain. CockroachDB automatically increases the verbosity of logging when it detects a stall in the range lease transfer stage of `node drain`. Messages logged during such a stall include the time an attempt occurred, the total duration stalled waiting for the transfer attempt to complete, and the lease that is being transferred. Default:`10m`
`--self`	Applies the operation to the node against which the command was run (e.g., via `--host`).

The node recommission subcommand also supports the following general flag:

Flag	Description
`--self`	Applies the operation to the node against which the command was run (e.g., via `--host`).

Client connection

Flag	Description
`--url`	A to use instead of the other arguments. To convert a connection URL to the syntax that works with your client driver, run . Env Variable:`COCKROACH\_URL` Default: no URL
`--host`	The server host and port number to connect to. This can be the address of any node in the cluster. Env Variable:`COCKROACH\_HOST` Default:`localhost:26257`
`--port` `-p`	The server port to connect to. Note: The port number can also be specified via `--host`. Env Variable:`COCKROACH\_PORT` Default:`26257`
`--user` `-u`	The that will own the client session. Env Variable:`COCKROACH\_USER` Default:`root`
`--insecure`	Use an insecure connection. Env Variable:`COCKROACH\_INSECURE` Default:`false`
`--cert-principal-map`	A comma-separated list of `:` mappings. This allows mapping the principal in a cert to a DB principal such as `node` or `root` or any SQL user. This is intended for use in situations where the certificate management system places restrictions on the `Subject.CommonName` or `SubjectAlternateName` fields in the certificate (e.g., disallowing a `CommonName` like `node` or `root`). If multiple mappings are provided for the same “, the last one specified in the list takes precedence. A principal not specified in the map is passed through as-is via the identity function. A cert is allowed to authenticate a DB principal if the DB principal name is contained in the mapped `CommonName` or DNS-type `SubjectAlternateName` fields.
`--certs-dir`	The path to the containing the CA and client certificates and client key. Env Variable:`COCKROACH\_CERTS\_DIR` Default:`${HOME}/.cockroach-certs/`

The node decommission, node recommission, and node drain subcommands also support the following client connection flags:

Flag	Description
`--cluster-name`	The cluster name to use to verify the cluster’s identity. If the cluster has a cluster name, you must include this flag. For more information, see .
`--disable-cluster-name-verification`	Disables the cluster name check for this command. This flag must be paired with `--cluster-name`. For more information, see .

See for more details.

Logging

By default, this command logs messages to stderr. This includes events with WARNING and higher. If you need to troubleshoot this command’s behavior, you can .

Response

The cockroach node subcommands return the following fields for each node.

`node ls`

Field	Description
`id`	The ID of the node.

`node status`

Field	Description
`id`	The ID of the node. Required flag: None
`address`	The address of the node. Required flag: None
`build`	The version of CockroachDB running on the node. If the binary was built from source, this will be the SHA hash of the commit used. Required flag: None
`locality`	The information specified for the node. Required flag: None
`updated\_at`	The date and time when the node last recorded the information displayed in this command’s output. When healthy, a new status should be recorded every 10 seconds or so, but when unhealthy this command’s stats may be much older. Required flag: None
`started\_at`	The date and time when the node was started. Required flag: None
`replicas\_leaders`	The number of range replicas on the node that are the Raft leader for their range. See `replicas\_leaseholders` below for more details. Required flag:`--ranges` or `--all`
`replicas\_leaseholders`	The number of range replicas on the node that are the leaseholder for their range. A “leaseholder” replica handles all read requests for a range and directs write requests to the range’s Raft leader (usually the same replica as the leaseholder). Required flag:`--ranges` or `--all`
`ranges`	The number of ranges that have replicas on the node. Required flag:`--ranges` or `--all`
`ranges\_unavailable`	The number of unavailable ranges that have replicas on the node. Required flag:`--ranges` or `--all`
`ranges\_underreplicated`	The number of underreplicated ranges that have replicas on the node. Required flag:`--ranges` or `--all`
`live\_bytes`	The amount of live data used by both applications and the CockroachDB system. This excludes historical and deleted data. Required flag:`--stats` or `--all`
`key\_bytes`	The amount of live and non-live data from keys in the key-value storage layer. This does not include data used by the CockroachDB system. Required flag:`--stats` or `--all`
`value\_bytes`	The amount of live and non-live data from values in the key-value storage layer. This does not include data used by the CockroachDB system. Required flag:`--stats` or `--all`
`intent\_bytes`	The amount of non-live data associated with uncommitted (or recently-committed) transactions. Required flag:`--stats` or `--all`
`system\_bytes`	The amount of data used just by the CockroachDB system. Required flag:`--stats` or `--all`
`is\_available`	If `true`, the node is currently available. Required flag: None
`is\_live`	If `true`, the node is currently live. For unavailable clusters (with an unresponsive DB Console), running the `node status` command and monitoring the `is\_live` field is the only way to identify the live nodes in the cluster. However, you need to run the `node status` command on a live node to identify the other live nodes in an unavailable cluster. Figuring out a live node to run the command is a trial-and-error process, so run the command against each node until you get one that responds. See Identify live nodes in an unavailable cluster for more details. Required flag: None
`gossiped\_replicas`	The number of replicas on the node that are active members of a range. After the decommissioning process completes, this should be 0. Required flag:`--decommission` or `--all`
`is\_decommissioning`	If `true`, the node is either undergoing or has completed the . Required flag:`--decommission` or `--all`
`is\_draining`	If `true`, the node is either undergoing or has completed the . Required flag:`--decommission` or `--all`

`node decommission`

Field	Description
`id`	The ID of the node.
`is\_live`	If `true`, the node is live.
`replicas`	The number of replicas on the node that are active members of a range. After the decommissioning process completes, this should be 0.
`is\_decommissioning`	If `true`, the node is either undergoing or has completed the .
`is\_draining`	If `true`, the node is either undergoing or has completed the .

If the rebalancing stalls during decommissioning, replicas that have yet to move are printed to the and written to the with the message possible decommission stall detected. , the OPS channel logs output to a cockroach.log file.

`node recommission`

Field	Description
`id`	The ID of the node.
`is\_live`	If `true`, the node is live.
`replicas`	The number of replicas on the node that are active members of a range. After the decommissioning process completes, this should be 0.
`is\_decommissioning`	If `true`, the node is either undergoing or has completed the .
`is\_draining`	If `true`, the node is either undergoing or has completed the .

Examples

Setup

To follow along with the examples, start , with defined.

List node IDs

$ cockroach node ls --insecure

  id
+----+
   1
   2
   3
(3 rows)

Show the status of a single node

$ cockroach node status 1 --host=localhost:26257 --insecure

  id |     address     |   sql_address   |                  build                  |            started_at            |           updated_at            |      locality       | is_available | is_live
+----+-----------------+-----------------+-----------------------------------------+----------------------------------+---------------------------------+---------------------+--------------+---------+
   1 | localhost:26257 | localhost:26257 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:54.308502+00:00 | 2019-10-01 20:05:43.85563+00:00 | region=us-east,az=1 | true         | true
(1 row)

Show the status of all nodes

$ cockroach node status --host=localhost:26257 --insecure

  id |     address     |   sql_address   |                  build                  |            started_at            |            updated_at            |        locality        | is_available | is_live
+----+-----------------+-----------------+-----------------------------------------+----------------------------------+----------------------------------+------------------------+--------------+---------+
   1 | localhost:26257 | localhost:26257 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:54.308502+00:00 | 2019-10-01 20:06:15.356886+00:00 | region=us-east,az=1    | true         | true
   2 | localhost:26258 | localhost:26258 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:54.551761+00:00 | 2019-10-01 20:06:15.583967+00:00 | region=us-central,az=2 | true         | true
   3 | localhost:26259 | localhost:26259 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:55.178577+00:00 | 2019-10-01 20:06:16.204549+00:00 | region=us-west,az=3    | true         | true
(3 rows)

Identify live nodes in an unavailable cluster

The is_live and is_available columns give you information about a node’s current status:

is_live: The node is up and running
is_available: The node is part of the .

Only nodes that are both is_live: true and is_available: true can participate in the cluster. If either are false, check the logs so you can troubleshoot the node(s) in question. For example, the following indicates a healthy cluster, where a majority of the nodes are up (is_live: true) and a quorum can be reached (is_available: true for live nodes):

$ cockroach node status --host=localhost:26257 --insecure

  id |     address     |   sql_address   |                  build                  |            started_at            |            updated_at            |        locality        | is_available | is_live
+----+-----------------+-----------------+-----------------------------------------+----------------------------------+----------------------------------+------------------------+--------------+---------+
   1 | localhost:26257 | localhost:26257 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:54.308502+00:00 | 2019-10-01 20:07:04.857339+00:00 | region=us-east,az=1    | true         | true
   2 | localhost:26258 | localhost:26258 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:54.551761+00:00 | 2019-10-01 20:06:48.555863+00:00 | region=us-central,az=2 | false        | false
   3 | localhost:26259 | localhost:26259 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:55.178577+00:00 | 2019-10-01 20:07:01.207697+00:00 | region=us-west,az=3    | true         | true
(3 rows)

The following indicates an unhealthy cluster, where a majority of nodes are down (is_live: false), and thereby quorum cannot be reached (is_available: false for all nodes):

$ cockroach node status --host=localhost:26257 --insecure

  id |     address     |   sql_address   |                  build                  |            started_at            |            updated_at            |        locality        | is_available | is_live
+----+-----------------+-----------------+-----------------------------------------+----------------------------------+----------------------------------+------------------------+--------------+---------+
   1 | localhost:26257 | localhost:26257 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:54.308502+00:00 | 2019-10-01 20:07:37.464249+00:00 | region=us-east,az=1    | false        | true
   2 | localhost:26258 | localhost:26258 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:54.551761+00:00 | 2019-10-01 20:07:37.464259+00:00 | region=us-central,az=2 | false        | false
   3 | localhost:26259 | localhost:26259 | v19.2.0-alpha.20190606-2479-gd98e0839dc | 2019-10-01 20:04:55.178577+00:00 | 2019-10-01 20:07:37.464265+00:00 | region=us-west,az=3    | false        | false
(3 rows)

You need to run the node status command on a live node to identify the other live nodes in an unavailable cluster. Figuring out a live node to run the command is a trial-and-error process, so run the command against each node until you get one that responds.

Drain nodes

See .

Decommission nodes

See .

Recommission nodes

See .

​Subcommands

​Synopsis

​Flags

​General

​Client connection

​Logging

​Response

​node ls

​node status

​node decommission

​node recommission

​Examples

​Setup

​List node IDs

​Show the status of a single node

​Show the status of all nodes

​Identify live nodes in an unavailable cluster

​Drain nodes

​Decommission nodes

​Recommission nodes

​See also

Subcommands

Synopsis

Flags

General

Client connection

Logging

Response

`node ls`

`node status`

`node decommission`

`node recommission`

Examples

Setup

List node IDs

Show the status of a single node

Show the status of all nodes

Identify live nodes in an unavailable cluster

Drain nodes

Decommission nodes

Recommission nodes

See also