一.简单说明
etcd的数据库空间配额大小默认限制为2G，当数据达到2G的时候就不允许写入。这里如果想继续写入，必须对历史数据进行压缩，或者调整etcd数据库的空间配额大小限制。
二.具体配置
当空间配额满载时，会提示mvcc: database space exceeded
2.1 查看etcd的配额使用量
[root@k8s001 ~]# export ETCDCTL_API=3
[root@k8s001 ~]# etcdctl endpoint status --write-out table
+----------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+----------------+------------------+---------+---------+-----------+-----------+------------+
| 127.0.0.1:2379 | 8e9e05c52164694d | 3.3.10 | 7.8 MB | true | 3 | 3085227 |
+----------------+------------------+---------+---------+-----------+-----------+------------+
2.2 开启磁盘碎片整理
1.获取历史版本号
[root@k8s001 ~]# export ETCDCTL_API=3
[root@k8s001 ~]# etcdctl endpoint status --write-out="json" | egrep -o '"revision":[0-9]*' | egrep -o '[0-9].*'
8991138
2.压缩旧版本
[root@k8s001 ~]# etcdctl compact 8991138
compacted revision 8991138
3.etcd进行碎片整理
[root@k8s001 ~]# etcdctl defrag
Finished defragmenting etcd member[127.0.0.1:2379]
4.查看etcd数据库大小
[root@k8s001 ~]# etcdctl endpoint status --write-out table
+----------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+----------------+------------------+---------+---------+-----------+-----------+------------+
| 127.0.0.1:2379 | 8e9e05c52164694d | 3.3.10 | 1.3 MB | true | 3 | 3089646 |
+----------------+------------------+---------+---------+-----------+-----------+------------+
2.3 修改etcd空间配额大小
1.修改systemd文件
[root@k8s001 ~]# cat /etc/systemd/system/etcd.service
......
--quota-backend-bytes=10240000000 # 这里单位是字节
......
2.重启etcd服务
[root@k8s001 ~]# systemctl daemon-reload
[root@k8s001 ~]# systemctl restart etcd