etcd_dbsize 只能使用2G限制修改

etcd DB 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.

1. 查看 etcd的 使用情况

[root@master1 ~]# export ETCDCTL_API=3
[root@master1 ~]# etcdctl endpoint status --write-out table
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|    ENDPOINT    |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 127.0.0.1:2379 | 3de693f1d3a82371 |   3.4.9 |   16 MB |     false |      false |         4 |    4088148 |            4088148 |        |
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

2. 获取历史版本号

[root@master1 ~]# etcdctl endpoint status --write-out="json" | egrep -o '"revision":[0-9]*' | egrep -o '[0-9].*'
3120107

3. 压缩旧版本

[root@master1 ~]# etcdctl compact 3120107
compacted revision 3120107

4. 整理磁盘碎片 

[root@master1 ~]# etcdctl defrag  
Finished defragmenting etcd member[127.0.0.1:2379]

5. 再次查看etcd db大小

[root@master1 ~]# etcdctl endpoint status --write-out table
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|    ENDPOINT    |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 127.0.0.1:2379 | 3de693f1d3a82371 |   3.4.9 |  2.0 MB |     false |      false |         4 |    4088322 |            4088322 |        |
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

6. 修改etcd 配置调整大小

[root@master1 ~]# vim /lib/systemd/system/etcd.service 

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/data/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
User=etcd
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --quota-backend-bytes=10240000000"
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

7. 重启

[root@master1 ~]# systemctl daemon-reload
[root@master1 ~]# systemctl restart etcd