Etcd 维护

1、设置保留历史时间 --auto-compaction-retention

保持一个小时的历史

$ etcd --auto-compaction-retention=1

压缩到修订版本3

$ etcdctl compact 3

2、压缩后，反碎片化 etcdctl defrag

3、备份快照 etcdctl snapshot save backup.db

4、快照恢复

etcdctl snapshot restore snapshot.db \ --name m1 \ --initial-cluster m1=http:/host1:2380,m2=http://host2:2380,m3=http://host3:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-advertise-peer-urls http://host1:2380

etcdctl snapshot restore snapshot.db --name m2 --initial-cluster m1=http:/host1:2380,m2=http://host2:2380,m3=http://host3:2380 --initial-cluster-token etcd-cluster-1 --initial-advertise-peer-urls http://host2:2380 $ etcdctl snapshot restore snapshot.db --name m3 --initial-cluster m1=http:/host1:2380,m2=http://host2:2380,m3=http://host3:2380 --initial-cluster-token etcd-cluster-1 --initial-advertise-peer-urls http://host3:2380

启动

etcd \ --name m1 \ --listen-client-urls http://host1:2379 \ --advertise-client-urls http://host1:2379 \ --listen-peer-urls http://host1:2380 &

etcd --name m2 --listen-client-urls http://host2:2379 --advertise-client-urls http://host2:2379 --listen-peer-urls http://host2:2380 & $ etcd --name m3 --listen-client-urls http://host3:2379 --advertise-client-urls http://host3:2379 --listen-peer-urls http://host3:2380 &

5、配置空间配额

设置非常小的 16MB 配额

$ etcd --quota-backend-bytes=16777216

删除多读的键空间将把集群带回配额限制，因此警告能被接触:

获取当前修订版本

$ etcdctl --endpoints=:2379 endpoint status [{"Endpoint":"127.0.0.1:2379","Status":{"header":{"cluster_id":8925027824743593106,"member_id":13803658152347727308,"revision":1516,"raft_term":2},"version":"2.3.0+git","dbSize":17973248,"leader":13803658152347727308,"raftIndex":6359,"raftTerm":2}}]

压缩所有旧有修订版本

$ etdctl compact 1516 compacted revision 1516

反碎片化过度空间

$ etcdctl defrag Finished defragmenting etcd member[127.0.0.1:2379]

解除警告

$ etcdctl alarm disarm memberID:13803658152347727308 alarm:NOSPACE

测试put被再度容许

$ etdctl put newkey 123 OK