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110 lines
3.3 KiB
Markdown
110 lines
3.3 KiB
Markdown
# Status and Diagnostics API
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A status API exists, which returns extensive diagnostic and statistical information, as well as basic information about the underlying Raft node. Assuming the rqlite node is started with default settings, node status is available via a HTTP `GET` request. To see the raw data, you can issue a `curl` command like so:
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```bash
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curl localhost:4001/status?pretty
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```
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The use of the URL param `pretty` is optional, and results in pretty-printed JSON responses.
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You can also request the same status information via the CLI:
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```
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$ ./rqlite
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Welcome to the rqlite CLI. Enter ".help" for usage hints.
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127.0.0.1:4001> .status
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build:
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build_time: unknown
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commit: unknown
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version: 5
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branch: unknown
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http:
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addr: 127.0.0.1:4001
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auth: disabled
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redirect:
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node:
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start_time: 2019-12-23T22:34:46.215507011-05:00
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uptime: 16.963009139s
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runtime:
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num_goroutine: 9
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version: go1.13
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```
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## Nodes API
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The _nodes_ API returns basic information for nodes in the cluster, as seen by the node receiving the _nodes_ request. The receiving node will also check whether it can actually connect to all other nodes in the cluster. This is an effective way to determine the cluster leader, and the leader's HTTP API address. It can also be used to check if the cluster is **basically** running -- if the other nodes are reachable, it probably is.
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By default, the node only checks if _voting_ nodes are contactable.
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```bash
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curl localhost:4001/nodes?pretty
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curl localhost:4001/nodes?nonvoters&pretty # Also check non-voting nodes.
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curl localhost:4001/nodes?timeout=5s # Give up if all nodes don't respond within 5 seconds. Default is 30 seconds.
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```
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You can also request the same nodes information via the CLI:
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```
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$ ./rqlite
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Welcome to the rqlite CLI. Enter ".help" for usage hints.
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127.0.0.1:4001> .nodes
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1:
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api_addr: http://localhost:4001
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addr: 127.0.0.1:4002
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reachable: true
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leader: true
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2:
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api_addr: http://localhost:4003
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addr: 127.0.0.1:4004
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reachable: true
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leader: false
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3:
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api_addr: http://localhost:4005
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addr: 127.0.0.1:4006
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reachable: true
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leader: false
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```
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## Readiness checks
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rqlite nodes serve a "ready" status at `/readyz`. The endpoint will return `HTTP 200 OK` if the node is ready to respond to database requests and cluster management operations. An example access is shown below.
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```bash
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$ curl localhost:4001/readyz
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[+]leader ok
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```
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## expvar support
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rqlite also exports [expvar](http://godoc.org/pkg/expvar/) information. The standard expvar information, as well as some custom information, is exposed. This data can be retrieved like so (assuming the node is started in its default configuration):
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```bash
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curl localhost:4001/debug/vars
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```
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You can also request the same expvar information via the CLI:
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```
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$ rqlite
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127.0.0.1:4001> .expvar
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cmdline: [./rqlited data]
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db:
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execute_transactions: 0
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execution_errors: 1
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executions: 1
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queries: 0
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query_transactions: 0
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http:
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backups: 0
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executions: 0
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queries: 0
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memstats:
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Mallocs: 8950
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HeapSys: 2.588672e+06
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StackInuse: 557056
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LastGC: 0...
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```
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## pprof support
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[pprof](https://golang.org/pkg/net/http/pprof/) information is available by default and can be accessed as follows:
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```bash
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curl localhost:4001/debug/pprof/cmdline
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curl localhost:4001/debug/pprof/profile
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curl localhost:4001/debug/pprof/symbol
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```
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