ETCD数据库备份与还原

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1 备份etcd数据

etcdctl backup --data-dir /var/lib/etcd/default.etcd --backup-dir /root/etcdback

2 etcd备份脚本

#!/bin/bash
date_time=`date +%Y%m%d`
etcdctl backup --data-dir /var/lib/etcd/default.etcd --backup-dir /root/etcd71-${date_time}.etcd
tar cvzf etcd71-${date_time}.tar.gz etcd71-${date_time}.etcd
 
find /root/*.etcd -ctime +7 -exec rm -r {} \;
find /root/*.gz -ctime +7 -exec rm -r {} \;
tar cvzf etcdback-

3 V3版本备份

# mkdir -p /var/lib/etcd_backup/
# ETCDCTL_API=3 etcdctl snapshot  save /var/lib/etcd_backup/etcd_$(date "+%Y%m%d%H%M%S").db

4 恢复etcd数据(集群不可用，灾难恢复)

下面介绍下当整个etcd集群不可用的情况下，如何快速的恢复一个etcd集群。

1.首先需要停止master节点的kube-apiserver服务:

systemctl stop kube-apiserver

确保kube-apiserver已经停止了，执行下列命令返回值为0

2 停掉集群中的所有etcd服务

systemctl stop etcd
# ps -ef|grep etcd|grep -v etcd|wc -l
0
确保etcd停止成功

3 移除所有etcd服务实例的数据目录

mv /var/lib/etcd/data.etcd /var/lib/etcd/data.etcd_bak

分别在各个节点恢复数据，首先需要拷贝数据到每个etcd节点，假设备份数据存储在/var/lib/etcd_backup/backup_20180107172459.db

scp /var/lib/etcd_backup/backup_20180107172459.db root@etcd01:/var/lib/etcd_backup/
scp /var/lib/etcd_backup/backup_20180107172459.db root@etcd02:/var/lib/etcd_backup/
scp /var/lib/etcd_backup/backup_20180107172459.db root@etcd03:/var/lib/etcd_backup/
scp /var/lib/etcd_backup/backup_20180107172459.db root@etcd04:/var/lib/etcd_backup/
scp /var/lib/etcd_backup/backup_20180107172459.db root@etcd05:/var/lib/etcd_backup/

在需要恢复的所有etcd实例上执行恢复命令:

ETCDCTL_API=3 etcdctl snapshot --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem  restore <备份数据> --name= --data-dir=<元数据存储路径> --initial-cluster= --initial-cluster-token=

4.同时启动etcd集群的所有etcd实例

systemctl start etcd

5.检查etcd集群member及健康状态

etcdctl --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem member list
etcdctl --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem cluster-health

6.启动master节点的所有kube-apiserver服务:

# systemctl start kube-apiserver
# systemctl status kube-apiserver

摘除etcd节点

向我们遇到的问题，需要将ceph节点的机器换成本地sata盘的机器，就需要先将部署在ceph上的etcd实例从集群中先摘除掉，然后在增加新的etcd实例到集群中。

1.查看etcd集群member信息

etcdctl --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem member list

2.根据member信息移除具体的etcd实例

etcdctl --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem member remove

3.停止etcd集群中被移除的etcd实例

# systemctl stop etcd
# yum remove -y etcd-xxxx

4.查看etcd实例是否从集群中被移除

etcdctl --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem member list

新增etcd节点

在已经存在的etcd节点上执行如下命令，增加新的etcd节点到集群中。

# etcdctl --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem member add  http://:2380
ETCD_NAME=etcd01
ETCD_INITIAL_CLUSTER="etcd01=http://ip1:2380,etcd02=http://ip2:2380,etcd03=http://ip3:2380,etcd04=http://ip4:2380,etcd05=http://ip5:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

注意:

etcd_name: etcd.conf配置文件中ETCD_NAME内容
etdc_node_address: etcd.conf配置文件中的ETCD_LISTEN_PEER_URLS内容

此时新的etcd节点已经被加到了现有的etcd集群。修改新增加的etcd节点的配置文件/etc/etcd/etcd.conf，将ETCD_INITIAL_CLUSTER修改成上面输出的内容，并增加相关的配置。

启动新的etcd节点:

systemctl start etcd

并对已经存在的etcd节点的配置项ETCD_INITIAL_CLUSTER增加=http://:2380参数。并“同时”重启所有的etcd。

更新etcd节点

ETCDCTL_API=3 etcdctl member update   http://:2380

ETCD数据库备份与还原

摘除etcd节点

新增etcd节点

更新etcd节点

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