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賬號設(shè)置退出

一篇帶給你ETCD入門指南

作者：華仔 2021-07-21 09:48:20

開發(fā) 前端

之前對etcd不是很了解，于是下定決心學(xué)習(xí)一下。隨手把過程記錄了一下，希望對大家有幫助。

[[412381]]

前言

之前對etcd不是很了解，于是下定決心學(xué)習(xí)一下。隨手把過程記錄了一下，希望對大家有幫助。

環(huán)境說明如下：

一、集群搭建

我這里將etcd部署在虛擬機上，采取靜態(tài)配置，即在etcd各節(jié)點在配置中指定。

1.所有節(jié)點下載etcd并解壓、移動至/usr/local/bin/，并給予對應(yīng)權(quán)限

# 下載地址：https://github.com/etcd-io/etcd/releases 
wget https://github.com/coreos/etcd/releases/download/v3.4.16/etcd-v3.4.16-linux-amd64.tar.gz 
tar -zxvf etcd-v3.4.16-linux-amd64.tar.gz 
cd etcd* 
mv etcdctl etcd /usr/local/bin 
chmod +x /usr/local/bin/etcd*

2.證書文件

# 證書文件 ca-config.json etcd-ca-csr.json etcd-csr.json 
cat ca-config.json 
{ 
  "signing": { 
    "default": { 
      "expiry": "876000h" 
    }, 
    "profiles": { 
      "kubernetes": { 
        "usages": [ 
            "signing", 
            "key encipherment", 
            "server auth", 
            "client auth" 
        ], 
        "expiry": "876000h" 
      } 
    } 
  } 
} 
 
cat etcd-ca-csr-json 
{ 
  "CN": "etcd", 
  "key": { 
    "algo": "rsa", 
    "size": 2048 
  }, 
  "names": [ 
    { 
      "C": "CN", 
      "ST": "Shenzhen", 
      "L": "Shenzhen", 
      "O": "etcd", 
      "OU": "Etcd Security" 
    } 
  ] 
} 
 
 
cat etcd-csr.json 
{ 
    "CN": "etcd", 
    "hosts": [ 
      "127.0.0.1", 
      "10.211.55.50", 
      "10.211.55.51", 
      "10.211.55.52" 
    ], 
    "key": { 
        "algo": "rsa", 
        "size": 2048 
    }, 
    "names": [ 
        { 
            "C": "CN", 
            "ST": "Shenzhen", 
            "L": "Shenzhen", 
            "O": "etcd", 
            "OU": "Etcd Security" 
        } 
    ] 
}

3.etcd-ca證書

cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare etcd-ca 
# 查看證書文件 
[root@etcd1 opt]# ls -al 
total 36 
drwxr-xr-x.  2 root root  186 May 13 21:53 . 
dr-xr-xr-x. 17 root root  244 Oct 21  2020 .. 
-rw-------   1 root root  294 Nov 27  2019 ca-config.json 
-rw-r--r--   1 root root 1005 May 13 21:53 etcd-ca.csr 
-rw-------   1 root root  212 Nov 27  2019 etcd-ca-csr.json 
-rw-------   1 root root 1675 May 13 21:53 etcd-ca-key.pem 
-rw-r--r--   1 root root 1371 May 13 21:53 etcd-ca.pem 
-rw-------   1 root root  374 May 13 21:48 etcd-csr.json

4.生成etcd證書

cfssl gencert -ca=etcd-ca.pem -ca-key=etcd-ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd 
# 查看證書 
ls -al 
total 36 
drwxr-xr-x.  2 root root  186 May 13 21:53 . 
dr-xr-xr-x. 17 root root  244 Oct 21  2020 .. 
-rw-------   1 root root  294 Nov 27  2019 ca-config.json 
-rw-r--r--   1 root root 1005 May 13 21:53 etcd-ca.csr 
-rw-------   1 root root  212 Nov 27  2019 etcd-ca-csr.json 
-rw-------   1 root root 1675 May 13 21:53 etcd-ca-key.pem 
-rw-r--r--   1 root root 1371 May 13 21:53 etcd-ca.pem 
-rw-r--r--   1 root root 1078 May 13 21:53 etcd.csr 
-rw-------   1 root root  374 May 13 21:48 etcd-csr.json 
-rw-------   1 root root 1679 May 13 21:53 etcd-key.pem 
-rw-r--r--   1 root root 1456 May 13 21:53 etcd.pem

5.復(fù)制到etcd的證書到證書目錄

mkdir -pv /etc/etcd/ssl && cp etcd*.pem /etc/etcd/ssl 
# 復(fù)制證書目錄到其他節(jié)點 
scp -r /etc/etcd root@etcd2 
scp -r /etc/etcd root@etcd3

6.配置成系統(tǒng)服務(wù)

cat etcd.service # 要根據(jù)每個節(jié)點進行修改IP和name 
[Unit] 
Description=Etcd Server 
After=network.target 
After=network-online.target 
Wants=network-online.target 
Documentation=https://github.com/coreos 
[Service] 
Type=notify 
WorkingDirectory=/var/lib/etcd/ 
EnvironmentFile=-/etc/etcd/etcd.conf 
ExecStart=/usr/local/bin/etcd \ 
--name=etcd1 \ 
--cert-file=/etc/etcd/ssl/etcd.pem \ 
--key-file=/etc/etcd/ssl/etcd-key.pem \ 
--peer-cert-file=/etc/etcd/ssl/etcd.pem \ 
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \ 
--trusted-ca-file=/etc/etcd/ssl/etcd-ca.pem \ 
--peer-trusted-ca-file=/etc/etcd/ssl/etcd-ca.pem \ 
--initial-advertise-peer-urls=https://10.211.55.50:2380 \ 
--listen-peer-urls=https://10.211.55.50:2380 \ 
--listen-client-urls=https://10.211.55.50:2379,http://127.0.0.1:2379 \ 
--advertise-client-urls=https://10.211.55.50:2379 \ 
--initial-cluster-token=etcd-cluster-0 \ 
--initial-cluster=etcd1=https://10.211.55.50:2380,etcd2=https://10.211.55.51:2380,etcd3=https://10.211.55.52:2380 \ 
--initial-cluster-state=new \ 
--data-dir=/var/lib/etcd 
Restart=on-failure 
RestartSec=5 
LimitNOFILE=65536 
[Install] 
WantedBy=multi-user.target

7.啟動etcd

# 三個節(jié)點啟動etcd服務(wù) 
systemctl daemon-reload && systemctl enable etcd && systemctl start etcd

8.檢查集群狀態(tài)

# 檢查member 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.52:2379 member list -w table 
+------------------+---------+-------+---------------------------+---------------------------+------------+ 
|        ID        | STATUS  | NAME  |        PEER ADDRS         |       CLIENT ADDRS        | IS LEARNER | 
+------------------+---------+-------+---------------------------+---------------------------+------------+ 
|  ca2cb14b2acc776 | started | etcd3 | https://10.211.55.52:2380 | https://10.211.55.52:2379 |      false | 
| 31f517c6aefb1a37 | started | etcd1 | https://10.211.55.50:2380 | https://10.211.55.50:2379 |      false | 
| ad1ee26f89ef12f4 | started | etcd2 | https://10.211.55.51:2380 | https://10.211.55.51:2379 |      false | 
+------------------+---------+-------+---------------------------+---------------------------+------------+ 
 
# 查看是否有LD 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 endpoint status -w table 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
|         ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
| https://10.211.55.50:2379 | 31f517c6aefb1a37 |  3.4.16 |   25 kB |      true |      false |       645 |         54 |                 54 |        | 
| https://10.211.55.51:2379 | ad1ee26f89ef12f4 |  3.4.16 |   20 kB |     false |      false |       645 |         54 |                 54 |        | 
| https://10.211.55.52:2379 |  ca2cb14b2acc776 |  3.4.16 |   20 kB |     false |      false |       645 |         54 |                 54 |        | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
 
# 嘗試寫入數(shù)據(jù) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379  put foo4 bar4 
 
# 讀取數(shù)據(jù) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 get  foo4 
foo4 
bar4 
 
# 獲取所有key 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 get --prefix  --keys-only '' 
foo 
foo2 
foo3 
foo4 
 
# 只獲取value 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 get  --print-value-only --prefix=true '' 
bar 
bar2 
bar3 
bar 
 
# 獲取指定key、rev的數(shù)據(jù) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 get  foo4 -w json 
{"header":{"cluster_id":9218922165880849559,"member_id":910513364439713654,"revision":10,"raft_term":645},"kvs":[{"key":"Zm9vNA==","create_revision":7,"mod_revision":10,"version":4,"value":"eGl5YW5neGl4aQ=="}],"count":1} 
 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 get  foo4 -w json --rev=8 
{"header":{"cluster_id":9218922165880849559,"member_id":3599809619259234871,"revision":10,"raft_term":645},"kvs":[{"key":"Zm9vNA==","create_revision":7,"mod_revision":8,"version":2,"value":"eGl5YW5neGl4aWE="}],"count":1}

二、成員變更

刪除成員

因為我的資源有限，所以先模擬刪除成員再添加成員。

# 先檢查集群狀態(tài)并獲取成員ID 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 endpoint status -w table 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
|         ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
| https://10.211.55.50:2379 | 31f517c6aefb1a37 |  3.4.16 |   25 kB |      true |      false |       645 |         54 |                 54 |        | 
| https://10.211.55.51:2379 | ad1ee26f89ef12f4 |  3.4.16 |   20 kB |     false |      false |       645 |         54 |                 54 |        | 
| https://10.211.55.52:2379 |  ca2cb14b2acc776 |  3.4.16 |   20 kB |     false |      false |       645 |         54 |                 54 |        | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
 
# 通過ID刪除成員，這里以刪除10.211.55.52為例 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379 member remove ca2cb14b2acc776 
Member  ca2cb14b2acc776 removed from cluster 7ff030ddad4d8497 
 
# 檢查集群狀態(tài)，只有兩個節(jié)點了 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 endpoint status -w table 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
|         ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
| https://10.211.55.50:2379 | 31f517c6aefb1a37 |  3.4.16 |   25 kB |      true |      false |       645 |         58 |                 58 |        | 
| https://10.211.55.51:2379 | ad1ee26f89ef12f4 |  3.4.16 |   20 kB |     false |      false |       645 |         58 |                 58 |        | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
 
# 查看10.211.55.52 etcd狀態(tài)，發(fā)現(xiàn)etcd 
systemctl status etcd 
● etcd.service - Etcd Server 
   Loaded: loaded (/etc/systemd/system/etcd.service; enabled; vendor preset: disabled) 
   Active: inactive (dead) since Sun 2021-07-04 11:39:42 CST; 1min 31s ago 
   ...... 
    
# 嘗試寫入數(shù)據(jù) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379  put foo4 bar8 
OK 
 
# 嘗試獲取寫入的數(shù)據(jù) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379  get  foo4  
foo4 
bar8

添加成員

添加成員主要分為兩步，一是通過etcdctl添加成員，二是根據(jù)第一步輸出的配置修改etcd配置并啟動etcd

# 先通過etcdctl添加成員 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379  member add etcd3 --peer-urls="https://10.211.55.52:2380" 
Member 89088d035064124d added to cluster 7ff030ddad4d8497 
 
ETCD_NAME="etcd3" 
ETCD_INITIAL_CLUSTER="etcd1=https://10.211.55.50:2380,etcd3=https://10.211.55.52:2380,etcd2=https://10.211.55.51:2380" 
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.211.55.52:2380" 
ETCD_INITIAL_CLUSTER_STATE="existing" 
 
# 更改etcd配置并啟動etcd，注意要保證etcd數(shù)據(jù)目錄為空 
systemctl cat etcd 
# /etc/systemd/system/etcd.service 
[Unit] 
Description=Etcd Server 
After=network.target 
After=network-online.target 
Wants=network-online.target 
Documentation=https://github.com/coreos 
[Service] 
Type=notify 
WorkingDirectory=/var/lib/etcd/ 
EnvironmentFile=-/etc/etcd/etcd.conf 
ExecStart=/usr/local/bin/etcd \ 
--name=etcd3 \ 
--cert-file=/etc/etcd/ssl/etcd.pem \ 
--key-file=/etc/etcd/ssl/etcd-key.pem \ 
--peer-cert-file=/etc/etcd/ssl/etcd.pem \ 
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \ 
--trusted-ca-file=/etc/etcd/ssl/etcd-ca.pem \ 
--peer-trusted-ca-file=/etc/etcd/ssl/etcd-ca.pem \ 
--initial-advertise-peer-urls=https://10.211.55.52:2380 \ 
--listen-peer-urls=https://10.211.55.52:2380 \ 
--listen-client-urls=https://10.211.55.52:2379,http://127.0.0.1:2379 \ 
--advertise-client-urls=https://10.211.55.52:2379 \ 
--initial-cluster-token=etcd-cluster-0 \ 
--initial-cluster=etcd1=https://10.211.55.50:2380,etcd2=https://10.211.55.51:2380,etcd3=https://10.211.55.52:2380 \ 
--initial-cluster-state=existing \ 
--data-dir=/var/lib/etcd 
Restart=on-failure 
RestartSec=5 
LimitNOFILE=65536 
[Install] 
WantedBy=multi-user.target 
 
# 啟動etcd 
systemctl start etcd && systemctl status etcd 
 
# 檢查集群狀態(tài) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 endpoint status -w table 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
|         ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
| https://10.211.55.50:2379 | 31f517c6aefb1a37 |  3.4.16 |   25 kB |      true |      false |       645 |         62 |                 62 |        | 
| https://10.211.55.51:2379 | ad1ee26f89ef12f4 |  3.4.16 |   20 kB |     false |      false |       645 |         62 |                 62 |        | 
| https://10.211.55.52:2379 | 89088d035064124d |  3.4.16 |   20 kB |     false |      false |       645 |         62 |                 62 |        | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

三、數(shù)據(jù)備份

數(shù)據(jù)備份我這里直接使用snapshot人工備份好了，僅用于測試而已。

# 先寫入一個數(shù)據(jù)，方便后面做測試 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379  put xiyangxixi  boys 
OK 
 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379  get xiyangxixi 
xiyangxixi 
boys 
 
# 備份數(shù)據(jù) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379 snapshot save snapshot-xiyangxixi.db 
{"level":"info","ts":1625373129.2212617,"caller":"snapshot/v3_snapshot.go:119","msg":"created temporary db file","path":"snapshot-xiyangxixi.db.part"} 
{"level":"info","ts":"2021-07-04T12:32:09.228+0800","caller":"clientv3/maintenance.go:200","msg":"opened snapshot stream; downloading"} 
{"level":"info","ts":1625373129.2287908,"caller":"snapshot/v3_snapshot.go:127","msg":"fetching snapshot","endpoint":"https://10.211.55.50:2379"} 
{"level":"info","ts":"2021-07-04T12:32:09.231+0800","caller":"clientv3/maintenance.go:208","msg":"completed snapshot read; closing"} 
{"level":"info","ts":1625373129.2318149,"caller":"snapshot/v3_snapshot.go:142","msg":"fetched snapshot","endpoint":"https://10.211.55.50:2379","size":"25 kB","took":0.010441635} 
{"level":"info","ts":1625373129.2318769,"caller":"snapshot/v3_snapshot.go:152","msg":"saved","path":"snapshot-xiyangxixi.db"} 
Snapshot saved at snapshot-xiyangxixi.db

四、集群數(shù)據(jù)恢復(fù)

需要使用同一個備份文件。這里以上面的snapshot-xiyangxixi.db進行模擬。

# 注意： 
# 1、最好指定一下data-dir我這里沒指定，結(jié)果數(shù)據(jù)都到etcd1.etcd、etcd2.etcd、etcd3.etcd中去了，這樣子還得修改etcd.service文件 
# 2、恢復(fù)數(shù)據(jù)前，之前的數(shù)據(jù)目錄記得備份 
# 3、如果是單節(jié)點故障，可以考慮刪除該節(jié)點再添加該節(jié)點 
# etcd1上執(zhí)行 
etcdctl snapshot restore /root/snapshot-xiyangxixi.db  --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem  --name etcd1 --initial-advertise-peer-urls=https://10.211.55.50:2380 --initial-cluster-token=etcd-cluster-1 --initial-cluster=etcd1=https://10.211.55.50:2380,etcd2=https://10.211.55.51:2380,etcd3=https://10.211.55.52:2380 
{"level":"info","ts":1625373977.7445557,"caller":"snapshot/v3_snapshot.go:296","msg":"restoring snapshot","path":"/root/snapshot-xiyangxixi.db","wal-dir":"etcd1.etcd/member/wal","data-dir":"etcd1.etcd","snap-dir":"etcd1.etcd/member/snap"} 
{"level":"info","ts":1625373977.7477813,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"517f2ff3c4b9581b","added-peer-peer-urls":["https://10.211.55.52:2380"]} 
{"level":"info","ts":1625373977.7478256,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"6856401bd8388bec","added-peer-peer-urls":["https://10.211.55.50:2380"]} 
{"level":"info","ts":1625373977.7478426,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"6ea7d2ec70c556d5","added-peer-peer-urls":["https://10.211.55.51:2380"]} 
{"level":"info","ts":1625373977.7509031,"caller":"snapshot/v3_snapshot.go:309","msg":"restored snapshot","path":"/root/snapshot-xiyangxixi.db","wal-dir":"etcd1.etcd/member/wal","data-dir":"etcd1.etcd","snap-dir":"etcd1.etcd/member/snap"} 
 
# etcd2上執(zhí)行 
etcdctl snapshot restore /root/snapshot-xiyangxixi.db  --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem  --name etcd2 --initial-advertise-peer-urls=https://10.211.55.51:2380 --initial-cluster-token=etcd-cluster-1 --initial-cluster=etcd1=https://10.211.55.50:2380,etcd2=https://10.211.55.51:2380,etcd3=https://10.211.55.52:2380 
{"level":"info","ts":1625374104.1673598,"caller":"snapshot/v3_snapshot.go:296","msg":"restoring snapshot","path":"/root/snapshot-xiyangxixi.db","wal-dir":"etcd2.etcd/member/wal","data-dir":"etcd2.etcd","snap-dir":"etcd2.etcd/member/snap"} 
{"level":"info","ts":1625374104.1709266,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"517f2ff3c4b9581b","added-peer-peer-urls":["https://10.211.55.52:2380"]} 
{"level":"info","ts":1625374104.1709714,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"6856401bd8388bec","added-peer-peer-urls":["https://10.211.55.50:2380"]} 
{"level":"info","ts":1625374104.1709878,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"6ea7d2ec70c556d5","added-peer-peer-urls":["https://10.211.55.51:2380"]} 
{"level":"info","ts":1625374104.1741195,"caller":"snapshot/v3_snapshot.go:309","msg":"restored snapshot","path":"/root/snapshot-xiyangxixi.db","wal-dir":"etcd2.etcd/member/wal","data-dir":"etcd2.etcd","snap-dir":"etcd2.etcd/member/snap"} 
 
# etcd3上執(zhí)行 
etcdctl snapshot restore /root/snapshot-xiyangxixi.db  --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem  --name etcd3 --initial-advertise-peer-urls=https://10.211.55.52:2380 --initial-cluster-token=etcd-cluster-1 --initial-cluster=etcd1=https://10.211.55.50:2380,etcd2=https://10.211.55.51:2380,etcd3=https://10.211.55.52:2380 
{"level":"info","ts":1625374158.713205,"caller":"snapshot/v3_snapshot.go:296","msg":"restoring snapshot","path":"/root/snapshot-xiyangxixi.db","wal-dir":"etcd3.etcd/member/wal","data-dir":"etcd3.etcd","snap-dir":"etcd3.etcd/member/snap"} 
{"level":"info","ts":1625374158.7164843,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"517f2ff3c4b9581b","added-peer-peer-urls":["https://10.211.55.52:2380"]} 
{"level":"info","ts":1625374158.7165308,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"6856401bd8388bec","added-peer-peer-urls":["https://10.211.55.50:2380"]} 
{"level":"info","ts":1625374158.7165465,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"a914ec3525c16b4","local-member-id":"0","added-peer-id":"6ea7d2ec70c556d5","added-peer-peer-urls":["https://10.211.55.51:2380"]} 
{"level":"info","ts":1625374158.7190611,"caller":"snapshot/v3_snapshot.go:309","msg":"restored snapshot","path":"/root/snapshot-xiyangxixi.db","wal-dir":"etcd3.etcd/member/wal","data-dir":"etcd3.etcd","snap-dir":"etcd3.etcd/member/snap"} 
 
# 啟動etcd 
systemctl daemon-reload && systemctl start etcd 
 
# 查看etcd集群狀態(tài) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379 endpoint status -w table 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
|         ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
| https://10.211.55.50:2379 | 6856401bd8388bec |  3.4.16 |   25 kB |     false |      false |         4 |          8 |                  8 |        | 
| https://10.211.55.51:2379 | 6ea7d2ec70c556d5 |  3.4.16 |   25 kB |      true |      false |         4 |          8 |                  8 |        | 
| https://10.211.55.52:2379 | 517f2ff3c4b9581b |  3.4.16 |   25 kB |     false |      false |         4 |          8 |                  8 |        | 
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 
 
# 獲取key為xiyangxixi的數(shù)據(jù) 
etcdctl --cacert /etc/etcd/ssl/etcd-ca.pem --cert /etc/etcd/ssl/etcd.pem  --key /etc/etcd/ssl/etcd-key.pem --endpoints=https://10.211.55.50:2379,https://10.211.55.51:2379,https://10.211.55.52:2379  get xiyangxixi 
xiyangxixi 
boys

參考

https://etcd.io/docs/v3.4/op-guide/hardware/
https://etcd.io/docs/v3.4/op-guide/recovery/
https://etcd.io/docs/v3.4/op-guide/clustering/

本文轉(zhuǎn)載自微信公眾號「運維開發(fā)故事」，可以通過以下二維碼關(guān)注。轉(zhuǎn)載本文請聯(lián)系運維開發(fā)故事公眾號。

責(zé)任編輯：姜華來源：運維開發(fā)故事

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