etcd集群数据迁移至新集群

旧ETCD环境数据备份

备份V2:

etcdctl  backup --data-dir /var/lib/etcd --backup-dir /opt/etcdv2

注：此处的数据目录为： /var/lib/etcd ，备份路径为：/opt/etcdv2

备份V3:

ETCDCTL_API=3 etcdctl snapshot save /opt/etcdv2/member/snap/db

注：此处的数据备份目录为 /opt/etcdv2/member/snap/db，路径和v2的备份路径相关联，具体关联如下：<v2-backdir>/member/snap/db

数据拷贝至新节点

旧节点数据打包：

zip -r etcdv2.zip  /opt/etcdv2

传送至新节点：

scp  etcdv2.zip root@xxxx:/opt  # scp至新机器（一台机器即可,这里传到了new-01节点上）

新集群恢复

1.解压备份文件并放在etcd数据目录下

unzip /opt/etcdv2 && mv /opt/etcdv2/member /var/lib/etcd/infra1.etcd/

2.启动新节点(new-01节点)

因为备份的数据中，存在旧服务的集群信息，因为我们进行了迁移，需要将原本的集群信息覆盖掉(不影响用户数据)，启动参数中添加配置--force-new-cluster，等服务成功启动后，旧集群信息已被覆盖，然后去掉此配置，重启服务即可

注：节点配置中，请勿过早添加其他节点信息，只需配置当前节点的信息即可，后面会依次加入新节点信息

new-01节点 etcd配置预览

etcd.service 折叠源码
[root@prod-k8s-01 ~]# cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
  
[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/bin/etcd 
--name=${ETCD_NAME}
--data-dir=${ETCD_DATA_DIR}
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS}
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS}
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS}
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS}
--initial-cluster=${ETCD_INITIAL_CLUSTER}
--initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN}
--initial-cluster-state=${ETCD_INITIAL_CLUSTER_STATE}
--force-new-cluster
Restart=on-failure
LimitNOFILE=65536
  
[Install]
WantedBy=multi-user.target
etcd.conf 折叠源码
[root@prod-k8s-01 ~]# cat /etc/etcd/etcd.conf
# configure file for etcd.service
# [member]
ETCD_NAME=infra1
ETCD_DATA_DIR="/var/lib/etcd/infra1.etcd"
ETCD_LISTEN_PEER_URLS="http://10.94.19.179:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.94.19.179:2379,http://127.0.0.1:2379"
#
# [cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.94.19.179:2380"
ETCD_INITIAL_CLUSTER="infra1=http://10.94.19.179:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://10.94.19.179:2379"

启动服务

[root@prod-k8s-01 ~]#systemctl  start etcd

服务启动成功后，把/usr/lib/systemd/system/etcd.service中的--force-new-cluster参数删除，再次重启etcd即可。

3.修正当前节点的peerURLs
在迁移过程中，出现了当前节点的peerURLs错误的问题，需要修正下

查看节点信息：

[root@prod-k8s-01 ~]# etcdctl member list
76926a56d901: name=infra1 peerURLs=http://10.94.19.179:2379 clientURLs=http://10.94.19.179:2379 isLeader=false

其中peerURLs=http://10.94.19.179:2379和配置中不相同，需要重新设置：

[root@prod-k8s-01 ~]# etcdctl member update 76926a56d901 http://10.94.19.179:2380 # 更改节点peerurls

至此，我们已经成功在新集群恢复了旧集群的数据，但是服务只有一个节点，不符合高可用要求，需要我们添加更多节点，以满足高可用

加入新节点

1.加入节点2

[root@prod-k8s-01 ~]# etcdctl member add infra2 http://10.94.19.180:2380

Added member named infra2 with ID ee0b43bac93847e to cluster ETCD_NAME="infra2" 
ETCD_INITIAL_CLUSTER="infra1=http://10.94.19.179:2380,infra2=http://10.94.19.180:2380" 
ETCD_INITIAL_CLUSTER_STATE="existing"

new-02节点 etcd配置预览

etcd.conf 折叠源码
[root@prod-k8s-02 ~]# cat /etc/etcd/etcd.conf
# configure file for etcd.service
# [member]
ETCD_NAME=infra2
ETCD_DATA_DIR="/var/lib/etcd/infra2.etcd"
ETCD_LISTEN_PEER_URLS="http://10.94.19.180:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.94.19.180:2379,http://127.0.0.1:2379"
#
# [cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.94.19.180:2380"
ETCD_INITIAL_CLUSTER="infra1=http://10.94.19.179:2380,infra2=http://10.94.19.180:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://10.94.19.180:2379"
etcd.service 折叠源码
[root@prod-k8s-02 ~]# cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
  
[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/bin/etcd 
--name=${ETCD_NAME}
--data-dir=${ETCD_DATA_DIR}
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS}
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS}
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS}
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS}
--initial-cluster=${ETCD_INITIAL_CLUSTER}
--initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN}
--initial-cluster-state=${ETCD_INITIAL_CLUSTER_STATE}
Restart=on-failure
LimitNOFILE=65536
  
[Install]
WantedBy=multi-user.target

启动02节点，其中关键配置需要设置成上面输出的信息。

查看节点列表

[root@prod-k8s-01 ~]# etcdctl member list
76926a56d901: name=infra1 peerURLs=http://10.94.19.179:2380 clientURLs=http://10.94.19.179:2379 isLeader=false
ee0b43bac93847e: name=infra2 peerURLs=http://10.94.19.180:2380 clientURLs=http://10.94.19.180:2379 isLeader=true

2.加入节点3

[root@prod-k8s-01 ~]# etcdctl member add infra3 http://10.94.19.181:2380
Added member named infra4 with ID 58805300c0ea60c2 to cluster

ETCD_NAME="infra3"
ETCD_INITIAL_CLUSTER="infra1=http://10.94.19.179:2380,infra2=http://10.94.19.180:2380,infra3=http://10.94.19.181:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

new-03节点 etcd配置预览

etcd.conf 折叠源码
[root@prod-k8s-03 ~]# cat /etc/etcd/etcd.conf
# configure file for etcd.service
# [member]
ETCD_NAME=infra3
ETCD_DATA_DIR="/var/lib/etcd/infra3.etcd"
ETCD_LISTEN_PEER_URLS="http://10.94.19.181:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.94.19.181:2379,http://127.0.0.1:2379"
#
# [cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.94.19.181:2380"
ETCD_INITIAL_CLUSTER="infra1=http://10.94.19.179:2380,infra2=http://10.94.19.180:2380,infra3=http://10.94.19.181:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://10.94.19.181:2379"
etcd.service 折叠源码
[root@prod-k8s-03 ~]# cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
  
[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/bin/etcd 
--name=${ETCD_NAME}
--data-dir=${ETCD_DATA_DIR}
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS}
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS}
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS}
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS}
--initial-cluster=${ETCD_INITIAL_CLUSTER}
--initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN}
--initial-cluster-state=${ETCD_INITIAL_CLUSTER_STATE}
Restart=on-failure
LimitNOFILE=65536
  
[Install]
WantedBy=multi-user.target

启动03节点，其中关键配置需要设置成上面输出的信息。

查看节点列表

[root@prod-k8s-01 ~]# etcdctl member list
76926a56d901: name=infra1 peerURLs=http://10.94.19.179:2380 clientURLs=http://10.94.19.179:2379 isLeader=false
ee0b43bac93847e: name=infra2 peerURLs=http://10.94.19.180:2380 clientURLs=http://10.94.19.180:2379 isLeader=true
58805300c0ea60c2: name=infra3 peerURLs=http://10.94.19.181:2380 clientURLs=http://10.94.19.181:2379 isLeader=false

调整new-01、new-02节点配置

修改new-01、new-02节点etcd.conf配置， 把ETCD_INITIAL_CLUSTER参数的值改成和new-03节点ETCD_INITIAL_CLUSTER参数一致，然后重启new-01、new-02 etcd服务。

查看新集群状态

[root@prod-k8s-01 ~]# etcdctl cluster-health
member 76926a56d901 is healthy: got healthy result from http://10.94.19.179:2379
member ee0b43bac93847e is healthy: got healthy result from http://10.94.19.180:2379
member 58805300c0ea60c2 is healthy: got healthy result from http://10.94.19.181:2379
cluster is healthy

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原文地址：https://www.cnblogs.com/guigujun/p/14188012.html