docker_practice/etcd/etcdctl.md

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## 使 etcdctl
`etcdctl` `etcd` `HTTP API` 便 `etcd` `etcdctl` `HTTP API`
`etcd` `etcdctl` [github.com/coreos/etcd/releases](https://github.com/coreos/etcd/releases) 下载。
`etcdctl`
```
NAME:
etcdctl - A simple command line client for etcd3.
USAGE:
etcdctl
VERSION:
3.2.10
API VERSION:
3.2
COMMANDS:
get Gets the key or a range of keys
put Puts the given key into the store
del Removes the specified key or range of keys [key, range_end)
txn Txn processes all the requests in one transaction
compaction Compacts the event history in etcd
alarm disarm Disarms all alarms
alarm list Lists all alarms
defrag Defragments the storage of the etcd members with given endpoints
endpoint health Checks the healthiness of endpoints specified in `--endpoints` flag
endpoint status Prints out the status of endpoints specified in `--endpoints` flag
watch Watches events stream on keys or prefixes
version Prints the version of etcdctl
lease grant Creates leases
lease revoke Revokes leases
lease timetolive Get lease information
lease keep-alive Keeps leases alive (renew)
member add Adds a member into the cluster
member remove Removes a member from the cluster
member update Updates a member in the cluster
member list Lists all members in the cluster
snapshot save Stores an etcd node backend snapshot to a given file
snapshot restore Restores an etcd member snapshot to an etcd directory
snapshot status Gets backend snapshot status of a given file
make-mirror Makes a mirror at the destination etcd cluster
migrate Migrates keys in a v2 store to a mvcc store
lock Acquires a named lock
elect Observes and participates in leader election
auth enable Enables authentication
auth disable Disables authentication
user add Adds a new user
user delete Deletes a user
user get Gets detailed information of a user
user list Lists all users
user passwd Changes password of user
user grant-role Grants a role to a user
user revoke-role Revokes a role from a user
role add Adds a new role
role delete Deletes a role
role get Gets detailed information of a role
role list Lists all roles
role grant-permission Grants a key to a role
role revoke-permission Revokes a key from a role
check perf Check the performance of the etcd cluster
help Help about any command
OPTIONS:
--cacert="" verify certificates of TLS-enabled secure servers using this CA bundle
--cert="" identify secure client using this TLS certificate file
--command-timeout=5s timeout for short running command (excluding dial timeout)
--debug[=false] enable client-side debug logging
--dial-timeout=2s dial timeout for client connections
--endpoints=[127.0.0.1:2379] gRPC endpoints
--hex[=false] print byte strings as hex encoded strings
--insecure-skip-tls-verify[=false] skip server certificate verification
--insecure-transport[=true] disable transport security for client connections
--key="" identify secure client using this TLS key file
--user="" username[:password] for authentication (prompt if password is not supplied)
-w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)
```
###
CRUD REST Create
etcd `testkey` `/` `cluster1/node2/testkey`
>CRUD Create, Read, Update, Delete REST API
#### put
```bash
$ etcdctl put /testdir/testkey "Hello world"
OK
```
#### get
```bash
$ etcdctl put testkey hello
OK
$ etcdctl get testkey
testkey
hello
```
`--sort`
`--consistent`
#### del
```bash
$ etcdctl del testkey
1
```
###
#### watch
`testkey` `Hello world`
```bash
$ etcdctl watch testkey
PUT
testkey
2
```
#### member
`list``add``update``remove` etcd etcd
`etcd`
```bash
$ etcdctl member list
422a74f03b622fef, started, node1, http://172.16.238.100:2380, http://172.16.238.100:23
```