etcd的基本使用
etcdctl
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etcdctl是一个命令行客户端，它能提供一些简洁的命令，供用户直接跟etcd服务打交道，而无需基于 HTTP API方式。可以方便我们在对服务进行测试或者手动修改数据库内容。这些操作跟HTTP API基本上是对应的。
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etcd项目二进制发行包中已经包含了etcdctl工具，etcdctl支持的命令大体上分为数据库操作和非数据库操作两类。
/ # etcd --version
etcd Version: 3.3.8
Git SHA: 33245c6b5
Go Version: go1.9.7
Go OS/Arch: linux/amd64
/ # etcdctl --help
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
#获取键或键的范围
put Puts the given key into the store
##将给定的键放入存储
del Removes the specified key or range of keys [key, range_end)
##删除指定的键或键范围[key, range_end)
txn Txn processes all the requests in one transaction
## txn在一个事务中处理所有请求
compaction Compacts the event history in etcd
## 将etcd中的事件历史记录压缩
alarm disarm Disarms all alarms
##解除所有警报
alarm list Lists all alarms
##告警列表列出所有告警信息
defrag Defragments the storage of the etcd members with given endpoints
##整理碎片整理具有给定端点的etcd成员的存储碎片
endpoint health Checks the healthiness of endpoints specified in `--endpoints` flag
##端点运行状况检查“--endpoints”标志中指定的端点的运行状况
endpoint status Prints out the status of endpoints specified in `--endpoints` flag
##端点状态打印'——endpoints '标志中指定的端点状态
watch Watches events stream on keys or prefixes
##监视键或前缀上的事件流
version Prints the version of etcdctl
##version打印etcdctl的版本
lease grant Creates leases
## 批地租约创建租约
lease revoke Revokes leases
##lease revoke撤消租赁
lease timetolive Get lease information
## lease timetolive获取租赁信息
lease keep-alive Keeps leases alive (renew)
##lease keep-alive使租约保持有效(更新)
member add Adds a member into the cluster
##成员添加向集群中添加一个成员
member remove Removes a member from the cluster
##成员移除从集群中移除一个成员
member update Updates a member in the cluster
##成员更新更新集群中的成员
member list Lists all members in the cluster
##列出集群中的所有成员
snapshot save Stores an etcd node backend snapshot to a given file
##将etcd节点后端快照存储到给定文件
snapshot restore Restores an etcd member snapshot to an etcd directory
##将etcd成员快照恢复到etcd目录
snapshot status Gets backend snapshot status of a given file
##获取给定文件的后端快照状态
make-mirror Makes a mirror at the destination etcd cluster
##在目标etcd集群上做一个镜像
migrate Migrates keys in a v2 store to a mvcc store
##将v2存储中的键迁移到mvcc存储中
lock Acquires a named lock
##获取一个命名的锁
elect Observes and participates in leader election
##观察并参与领导人选举
auth enable Enables authentication
##启用认证功能
auth disable Disables authentication
##禁用认证
user add Adds a new user
##添加一个新用户
user delete Deletes a user
##删除用户
user get Gets detailed information of a user
##获取用户的详细信息
user list Lists all users
##列出所有用户
user passwd Changes password of user
##修改用户密码
user grant-role Grants a role to a user
##授予用户角色
user revoke-role Revokes a role from a user
##取消用户的角色
role add Adds a new role
##添加新角色
role delete Deletes a role
##删除角色
role get Gets detailed information of a role
##t获取角色的详细信息
role list Lists all roles
##列出所有角色
role grant-permission Grants a key to a role
##向角色授予密钥
role revoke-permission Revokes a key from a role
##从角色中取消密钥
check perf Check the performance of the etcd cluster
##检查etcd集群的性能
help Help about any command
##帮助关于任何命令的帮助
OPTIONS:
--cacert="" verify certificates of TLS-enabled secure servers using this CA bundle
##使用这个CA bundle验证启用tls的安全服务器的证书
--cert="" identify secure client using this TLS certificate file
##使用此TLS证书文件识别安全客户端
--command-timeout=5s timeout for short running command (excluding dial timeout)
##短运行命令超时时间(不包括拨号超时时间)
--debug[=false] enable client-side debug logging
##启用客户端调试日志记录
--dial-timeout=2s dial timeout for client connections
##客户端连接拨号超时时间
--endpoints=[127.0.0.1:2379] gRPC endpoints
##gRPC端点
--hex[=false] print byte strings as hex encoded strings
##将字节字符串打印为十六进制编码的字符串
--insecure-skip-tls-verify[=false] skip server certificate erification
##跳过服务器证书验证
--insecure-transport[=true] disable transport security for client connections
##禁用客户端连接的传输安全性
--key="" identify secure client using this TLS key file
##使用此TLS密钥文件识别安全客户端
--user="" username[:password] for authentication (prompt if password is not supplied)
##用户名[:密码]用于认证(提示如果不提供密码)
-w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)
##设置输出格式(fields, json, protobuf, simple, table)
