Introduction
Etcd is divided into etcd2 and etcd3 versions. The APIs between the two versions are not compatible with each other. Now most companies are using etcd3 version. This article also uses etcd3 as the demonstration object.
etcdctl tool The command line tool attached to etcd can easily manage the data in etcd.
There are two versions of etcdctl: v2 and v3. You can use the following methods to set the versions respectively:
#Set v2 version export ETCDCTL_API=2 #Set v3 version export ETCDCTL_API=3
Here we only introduce the etcdctl v3 version.
Configure v3 version
sudo vi ~ / .bashrc
#Set etcdctl as the v3 version export ETCDCTL_API=3 #Set the endpoint information of etcd, that is, the ip:port of the etcd cluster, separated by commas export ENDPOINTS=10.10.10.45:2379,10.10.10.46:2379,10.10.10.47:2379
Common commands
1) View version
View version of the command
Enter: etcdctl version
2) Get the list of etcd members
Enter: etcdctl member list
The output information format includes fields, json, protobuf, simple, table, which are specified by --write-out, here I will try the table format
输入：etcdctl member list --write-out="table"
3) Write kv to etcd
etcdctl put key value
例如：etcdctl --endpoints=$ENDPOINTS put web3 'hello world3'
4) Query data from etcd
#Exactly query data with a key of web3 etcdctl get web3 #Fuzzy query matches data with a prefix of web etcdctl get --prefix web #Fuzzy query matches a key with a prefix of web (no value is returned) ./etcdctl --prefix --keys-only=true get web
5) Delete a key
key etcdctl
For example: etcdctl del web1
After the command is executed, the number of keys actually deleted is printed.
6) Lease agreement (ttl, expiration time)
a) View the list of leases
Execution: etcdctl lease list
b) Create a lease for a certain period of time, the unit is s: etcdctl lease grant n
Implementation: etcdctl lease grant 4000
c) Grant a lease (that is, expiration time) for a certain KV: etcdctl put --lease=name key value
执行：etcdctl put web3 'hello world' --lease=1255775c01ff5f28
d) View lease information
Execution: etcdctl lease timetolive 1255775c01ff5f28
e) Reset the lease (equivalent to reset the remaining expiration time, the remaining expiration time of all keys bound to the lease becomes 4000s)
执行：etcdctl lease keep-alive 1255775c01ff5f28
f) Revocation of the lease (the KV granted the lease will be deleted at the same time as the lease is revoked)
Execution: etcdctl lease revoke 1255775c01ff5f28
The above is the simple and practical of etcdctl. If you have any questions, you can leave a message at the back~
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