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cd /usr/local/src/ 
wget https://github.com/coreos/etcd/releases/download/v3.2.15/etcd-v3.2.15-linux-amd64.tar.gz

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tar -zxvf etcd-v3.2.15-linux-amd64.tar.gzmv 
etcd-v3.2.15-linux-amd64 etcd

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vim /etc/profileexport 
PATH=/usr/local/src/etcd:$PATHexport 
ETCDCTL_API=3

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root@ubuntu:/usr/local/src/etcd# ./etcd&[1] 
19228
root@ubuntu:/usr/local/src/etcd# 2018-03-07 13:40:16.719105 I | etcdmain: etcd Version: 3.2.15
2018-03-07 13:40:16.719217 I | etcdmain: Git SHA: 1b3ac99e8
2018-03-07 13:40:16.719235 I | etcdmain: Go Version: go1.8.5
2018-03-07 13:40:16.719244 I | etcdmain: Go OS/Arch: linux/amd64
2018-03-07 13:40:16.719254 I | etcdmain: setting maximum number of CPUs to 4, total number of available CPUs is 4
2018-03-07 13:40:16.719274 W | etcdmain: no data-dir provided, using default data-dir ./default.etcd
2018-03-07 13:40:16.719422 N | etcdmain: the server is already initialized as

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root@ubuntu:~# etcdctl  del f
1
root@ubuntu:~# etcdctl get "" --from-key
fo
xxx
foo
bar
root@ubuntu:~# etcdctl  put q qq
OK
root@ubuntu:~# etcdctl get "" --from-key
fo
xxx
foo
bar
q
qq
root@ubuntu:~# etcdctl  put q qqq
OK
root@ubuntu:~# etcdctl get "" --from-key
fo
xxx
foo
bar
q
qqq