常见命令演示
etcd –versionetcdctl –version
API3的要这样ETCDCTL_API=3 etcdctl version
启动：etcd
写一个数据与读取一个数据：key:key1 value:helloworldETCDCTL_API=3 etcdctl –endpoints=localhost:2379 put helloworldETCDCTL_API=3 etcdctl –endpoints=localhost:2379 get key1
单机启动：
etcd --name myetcd1 --listen-client-urls http://0.0.0.0:2379 --advertise-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-advertise-peer-urls http://0.0.0.0:2380 --initial-cluster my-etcd-1=http://0.0.0.0:2380
集群启动：
etcd --name myetcd1 --listen-client-urls http://0.0.0.0:2379 --advertise-client-urls http://192.168.9.100:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-advertise-peer-urls http://192.168.9.100:2380 --initial-cluster-token etcd-cluster-test --initial-cluster-state new --initial-cluster myetcd1=http://192.168.9.100:2380,myetcd2=http://192.168.9.100:2381,myetcd3=http://192.168.9.100:2382
etcd --name myetcd2 --listen-client-urls http://0.0.0.0:2389 --advertise-client-urls http://192.168.9.100:2389 --listen-peer-urls http://0.0.0.0:2381 --initial-advertise-peer-urls http://192.168.9.100:2381 --initial-cluster-token etcd-cluster-test --initial-cluster-state new --initial-cluster myetcd1=http://192.168.9.100:2380,myetcd2=http://192.168.9.100:2381,myetcd3=http://192.168.9.100:2382
etcd --name myetcd3 --listen-client-urls http://0.0.0.0:2399 --advertise-client-urls http://192.168.9.100:2399 --listen-peer-urls http://0.0.0.0:2382 --initial-advertise-peer-urls http://192.168.9.100:2382 --initial-cluster-token etcd-cluster-test --initial-cluster-state new --initial-cluster myetcd1=http://192.168.9.100:2380,myetcd2=http://192.168.9.100:2381,myetcd3=http://192.168.9.100:2382
用三个端口2380,2381,2382来模拟集群(这三个是成员之间通信),2379,2389,2399是给客户端连接的.服务器IP：192.168.9.100, 如果在本机模拟集群, 可以将192.168.9.100改为0.0.0.0
带advertise参数是广播参数: 如–listen-client-urls和–advertise-client-urls, 前者是Etcd端监听客户端的url,后者是Etcd客户端请求的url, 两者端口是相同的, 只不过后者一般为公网IP, 暴露给外部使用.
查看成员:
etcdctl member list
使用时需要指定endpoints(默认本地端口2379), 集群时数据会迅速同步:
ETCDCTL_API=3 etcdctl –endpoints=127.0.0.1:2389 put key1 xx
ETCDCTL_API=3 etcdctl –endpoints=127.0.0.1:2379 get key1
–name etcd0：本member的名字
–initial-advertise-peer-urls http://192.168.9.100:2380： 其他member使用，其他member通过该地址与本member交互信息。一定要保证从其他member能可访问该地址。静态配置方式下，该参数的value一定要同时在–initial-cluster参数中存在。memberID的生成受–initial-cluster-token和–initial-advertise-peer-urls影响。
–listen-peer-urls http://0.0.0.0:2380：本member侧使用，用于监听其他member发送信息的地址。ip为全0代表监听本member侧所有接口
–listen-client-urls http://0.0.0.0:2379： 本member侧使用，用于监听etcd客户发送信息的地址。ip为全0代表监听本member侧所有接口
–advertise-client-urls http://192.168.9.100:2379： etcd客户使用，客户通过该地址与本member交互信息。一定要保证从客户侧能可访问该地址
–initial-cluster-token etcd-cluster-2：用于区分不同集群。本地如有多个集群要设为不同。
–initial-cluster myetcd0=http://192.168.9.100:2380,myetcd1=http://192.168.9.100:2381,myetcd2=http://192.168.9.100:2382：本member侧使用。描述集群中所有节点的信息，本member根据此信息去联系其他member。memberID的生成受–initial-cluster-token和–initial-advertise-peer-urls影响。
–initial-cluster-state new：用于指示本次是否为新建集群。有两个取值new和existing。如果填为existing，则该member启动时会尝试与其他member交互。集群初次建立时，要填为new，经尝试最后一个节点填existing也正常，其他节点不能填为existing。集群运行过程中，一个member故障后恢复时填为existing，经尝试填为new也正常。
–data-dir：指定节点的数据存储目录，这些数据包括节点ID，集群ID，集群初始化配置，Snapshot文件，若未指定-wal-dir，还会存储WAL文件；如果不指定会用缺省目录。
–discovery http://192.168.9.100:20003/v2/keys/discovery/78b12ad7-2c1d-40db-9416-3727baf686cb：用于自发现模式下，指定第三方etcd上key地址，要建立的集群各member都会向其注册自己的地址。
ETCD API有两种, 一种是3, 一种是2, 默认为2, 我们主要用3:
API3:
[root@guods-1 centos]# ETCDCTL_API=3 etcdctl --endpoints=localhost:2379 put key1 helloworld
OK
[root@guods-1 centos]# ETCDCTL_API=3 etcdctl --endpoints=localhost:2379 get key1
key1
helloworld
API2:
[root@guods-1 centos]# etcdctl set key2 helloworld
helloworld
[root@guods-1 centos]# etcdctl get key2
helloworld
命令详解：
[root@guods-1 centos]# ETCDCTL_API=2 etcdctl
NAME:
etcdctl - A simple command line client for etcd.
USAGE:
etcdctl [global options] command [command options] [arguments...]
VERSION:
3.3.2
COMMANDS:
backup backup an etcd directory
cluster-health check the health of the etcd cluster
mk make a new key with a given value
mkdir make a new directory
rm remove a key or a directory
rmdir removes the key if it is an empty directory or a key-value pair
get retrieve the value of a key
ls retrieve a directory
set set the value of a key
setdir create a new directory or update an existing directory TTL
update update an existing key with a given value
updatedir update an existing directory
watch watch a key for changes
exec-watch watch a key for changes and exec an executable
member member add, remove and list subcommands
user user add, grant and revoke subcommands
role role add, grant and revoke subcommands
auth overall auth controls
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--debug output cURL commands which can be used to reproduce the request
--no-sync don't synchronize cluster information before sending request
--output simple, -o simple output response in the given format (simple, `extended` or `json`) (default: "simple")
--discovery-srv value, -D value domain name to query for SRV records describing cluster endpoints
--insecure-discovery accept insecure SRV records describing cluster endpoints
--peers value, -C value DEPRECATED - "--endpoints" should be used instead
--endpoint value DEPRECATED - "--endpoints" should be used instead
--endpoints value a comma-delimited list of machine addresses in the cluster (default: "http://127.0.0.1:2379,http://127.0.0.1:4001")
--cert-file value identify HTTPS client using this SSL certificate file
--key-file value identify HTTPS client using this SSL key file
--ca-file value verify certificates of HTTPS-enabled servers using this CA bundle
--username value, -u value provide username[:password] and prompt if password is not supplied.
--timeout value connection timeout per request (default: 2s)
--total-timeout value timeout for the command execution (except watch) (default: 5s)
--help, -h show help
--version, -v print the version
[root@guods-1 centos]# ETCDCTL_API=3 etcdctl
NAME:
etcdctl - A simple command line client for etcd3.
USAGE:
etcdctl
VERSION:
3.3.2
API VERSION:
3.3
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
endpoint hashkv Prints the KV history hash for each endpoint in --endpoints
move-leader Transfers leadership to another etcd cluster member.
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 list List all active leases
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
-d, --discovery-srv="" domain name to query for SRV records describing cluster endpoints
--endpoints=[127.0.0.1:2379] gRPC endpoints
-h, --help[=false] help for etcdctl
--hex[=false] print byte strings as hex encoded strings
--insecure-discovery[=true] accept insecure SRV records describing cluster endpoints
--insecure-skip-tls-verify[=false] skip server certificate verification
--insecure-transport[=true] disable transport security for client connections
--keepalive-time=2s keepalive time for client connections
--keepalive-timeout=6s keepalive timeout 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)